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• Record Webcam as single JPG files [on hold]

  2 décembre 2016, par clic

  I have to record a Windows Directshow Webcam video stream (UHD, 30fps, yuyv422) as single JPG images. Performance is important, so preferably by using NVIDIA GPU acceleration via CUDA or something..

  What is the most simple but powerful solution, without having to buy proprietary software ?

  I had a look at ffmpeg, by recording as MJPEG and then using something like jpegtran to get the JPGs. I tried :

  ffmpeg -f dshow -video_size 1920x1080 -framerate 50 -vcodec mjpeg -i video="XI100DUSB-HDMI Video" out.avi

  But it results in an I/O error saying ’Could not set video options’. Maybe because of the yuyv422 pixel format of my Magewell USB dongles..

  Or is ffmpeg able to record as single JPGs directly somehow ?

  If someone has any other idea/solution besides ffmpeg, please let me know too ! Thanks !

  EDIT :

  I was now able to save JPGs directly, using webcamimg%04d.jpg instead of out.avi. But it’s always claiming about full real-time buffer. Raising the rtbufsize parameter doesn’t really help..

  ffmpeg console output :

  ffmpeg version 3.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-li
  
  bopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.100 / 57. 64.100
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [dshow @ 0000000001c628a0] Could not set video options
  
  video=XI100DUSB-HDMI Video: I/O error

  Output of : ffmpeg -list_options true -f dshow -i video="XI100DUSB-HDMI Video"

  [dshow @ 00000000004d71e0] DirectShow video device options (from video devices)
  
  [dshow @ 00000000004d71e0]  Pin "Capture" (alternative pin name "0")
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1920x1080 fps=15 max s=1920x1080 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1920x1080 fps=15 max s=1920x1080 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=640x360 fps=15 max s=640x360 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=640x360 fps=15 max s=640x360 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=640x480 fps=15 max s=640x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=640x480 fps=15 max s=640x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=720x480 fps=15 max s=720x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=720x480 fps=15 max s=720x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=720x576 fps=15 max s=720x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=720x576 fps=15 max s=720x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=768x576 fps=15 max s=768x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=768x576 fps=15 max s=768x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=800x600 fps=15 max s=800x600 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=800x600 fps=15 max s=800x600 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=856x480 fps=15 max s=856x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=856x480 fps=15 max s=856x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=960x540 fps=15 max s=960x540 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=960x540 fps=15 max s=960x540 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1024x576 fps=15 max s=1024x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1024x576 fps=15 max s=1024x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1024x768 fps=15 max s=1024x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1024x768 fps=15 max s=1024x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x720 fps=15 max s=1280x720 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x720 fps=15 max s=1280x720 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x800 fps=15 max s=1280x800 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x800 fps=15 max s=1280x800 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x960 fps=15 max s=1280x960 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x960 fps=15 max s=1280x960 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x1024 fps=15 max s=1280x1024 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1280x1024 fps=15 max s=1280x1024 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1368x768 fps=15 max s=1368x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1368x768 fps=15 max s=1368x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1440x900 fps=15 max s=1440x900 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1440x900 fps=15 max s=1440x900 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1600x1200 fps=15 max s=1600x1200 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1600x1200 fps=15 max s=1600x1200 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1680x1050 fps=15 max s=1680x1050 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1680x1050 fps=15 max s=1680x1050 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1920x1200 fps=15 max s=1920x1200 fps=59.9999
  
  [dshow @ 00000000004d71e0]   pixel_format=yuyv422  min s=1920x1200 fps=15 max s=1920x1200 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1920x1080 fps=15 max s=1920x1080 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1920x1080 fps=15 max s=1920x1080 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=640x360 fps=15 max s=640x360 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=640x360 fps=15 max s=640x360 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=640x480 fps=15 max s=640x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=640x480 fps=15 max s=640x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=720x480 fps=15 max s=720x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=720x480 fps=15 max s=720x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=720x576 fps=15 max s=720x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=720x576 fps=15 max s=720x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=768x576 fps=15 max s=768x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=768x576 fps=15 max s=768x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=800x600 fps=15 max s=800x600 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=800x600 fps=15 max s=800x600 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=856x480 fps=15 max s=856x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=856x480 fps=15 max s=856x480 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=960x540 fps=15 max s=960x540 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=960x540 fps=15 max s=960x540 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1024x576 fps=15 max s=1024x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1024x576 fps=15 max s=1024x576 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1024x768 fps=15 max s=1024x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1024x768 fps=15 max s=1024x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x720 fps=15 max s=1280x720 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x720 fps=15 max s=1280x720 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x800 fps=15 max s=1280x800 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x800 fps=15 max s=1280x800 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x960 fps=15 max s=1280x960 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x960 fps=15 max s=1280x960 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x1024 fps=15 max s=1280x1024 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1280x1024 fps=15 max s=1280x1024 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1368x768 fps=15 max s=1368x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1368x768 fps=15 max s=1368x768 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1440x900 fps=15 max s=1440x900 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1440x900 fps=15 max s=1440x900 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1600x1200 fps=15 max s=1600x1200 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1600x1200 fps=15 max s=1600x1200 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1680x1050 fps=15 max s=1680x1050 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1680x1050 fps=15 max s=1680x1050 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1920x1200 fps=15 max s=1920x1200 fps=59.9999
  
  [dshow @ 00000000004d71e0]   unknown compression type 0xE436EB7D  min s=1920x1200 fps=15 max s=1920x1200 fps=59.9999
  
  video=XI100DUSB-HDMI Video: Immediate exit requested

• Syncing 3 RTSP video streams in ffmpeg

  26 septembre 2017, par Damon Maria

  I’m using an AXIS Q3708 camera. It internally has 3 sensors to create a 180º view. Each sensor puts out it’s own RTSP stream. To put together the full 180º view I need to pull an image from each stream and place the images side-by-side. Obviously it’s important that the 3 streams be synchronized so the 3 images were taken at the same ’wall clock’ time. For this reason I want to use ffmpeg because it should be a champ at this.

  I intended to use the hstack filter to combine the 3 images. However, it’s causing me a lot of grief and errors.

  What I’ve tried :

  1. Hstack the rtsp streams :

  ffmpeg -i "rtsp://root:root@192.168.13.104/axis-media/media.amp?camera=1" -i "rtsp://root:root@192.168.13.104/axis-media/media.amp?camera=2" -i "rtsp://root:root@192.168.13.104/axis-media/media.amp?camera=3" -filter_complex "[0:v][1:v][2:v]hstack=inputs=3[v]" -map "[v]" out.mp4

  I get lots of RTSP dropped packets decoding errors which is strange given this is an i7-7700K 4.2GHz with an NVIDIA GTX 1080 Ti and 32GB of RAM and the camera is on a local gigabit network :

  [rtsp @ 0xd4eca42a00] max delay reached. need to consume packetA dup=0 drop=136 speed=1.16x    
  
  [rtsp @ 0xd4eca42a00] RTP: missed 5 packets
  
  [rtsp @ 0xd4eca42a00] max delay reached. need to consume packetA dup=0 drop=137 speed=1.15x    
  
  [rtsp @ 0xd4eca42a00] RTP: missed 4 packets
  
  [h264 @ 0xd4ecbb3520] error while decoding MB 14 15, bytestream -21
  
  [h264 @ 0xd4ecbb3520] concealing 1185 DC, 1185 AC, 1185 MV errors in P frame

  2. Using ffmpeg -i %s -c:v copy -map 0:0 out.mp4 to save each stream to a file and then run the above hstack command with the 3 files rather than 3 RSTP streams. First off, there are no dropped packets saving the files, and the hstack runs at speed=25x so I don’t know why the operation in 1 had so many errors. But in the resulting video, some parts ’pause’ between frames as tho the same image was used across 2 frames for some of the hstack inputs, but not the others. Also, the ’scene’ at a set distance into the video lags behind the input videos – which would happen if the frames are being duplicated.

  3. If I use the RTSP streams as the input, and for the output specify -f null - (the null demuxer) then the demuxer reports a lot of these errors :

  [null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 1 >= 1
  
      Last message repeated 1 times
  
  [null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 2 >= 2
  
  [null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 3 >= 3
  
  [null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 4 >= 4
  
      Last message repeated 1 times
  
  [null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 5 >= 5
  
      Last message repeated 1 times

  Which sounds again like frames are being duplicated.

  4. If I add -vsync cfr then the null muxer no longer reports non monotonically increasing dts, and dropped packet / decoding errors are reduced (but still there). Does this show that timing info from the RTSP streams is ’tripping up’ ffmpeg ? I presume it’s not a solution tho because it is essentially wiping out and replacing the timing information ffmpeg would need to use to sync ?

  5. Saving a single RTSP stream (re-encoding, not using the copy codec or null demuxer) logs a lot of warnings like :

  Past duration 0.999992 too large
  
      Last message repeated 7 times
  
  Past duration 0.999947 too large
  
  Past duration 0.999992 too large

  6. I first tried performing this in code (using PyAV). But struck problems when pushing a frame from each container into the 3 hstack inputs would cause hstack to output multiple frames (when it should be only one). Again, this points to hstack duplicating frames.

  7. I have used Wireshark to sniff the RTCP/RTP traffic and the RTCP Sender Report’s have correct NTP timestamps in them matched to the timestamps in the RTP streams.

  8. Using ffprobe to show the frames of a RTSP stream (example below) I would have expected to see real (NTP based timestamps) given they exist in the RTCP packets. I’m not sure what is correct behaviour for ffprobe. But it does show that most frame timestamps are not exactly 0.25s (the camera is running 4 FPS) which might explain -vsync cfr ’fixing’ some issues and the Past duration 0.999992 style errors :

  pkt_pts=1012502
  
  pkt_pts_time=0:00:11.250022
  
  pkt_dts=1012502
  
  pkt_dts_time=0:00:11.250022
  
  best_effort_timestamp=1012502
  
  best_effort_timestamp_time=0:00:11.250022
  
  pkt_duration=N/A
  
  pkt_duration_time=N/A
  
  pkt_pos=N/A

  I posted this as a possible hstack bug on the ffmpeg bug tracker but that discussion fizzled out.

  So, question : how do I sync 3 RTSP video streams through hstack in ffmpeg ?

• What flags should enable to get maximum performance using ffpeg ?

  19 octobre 2017, par Sam

  I am using windows, my application is using opencv and for codecs, we have used ffmpeg. We see the performance is very slow, we want to improve it by compiling ffmpeg with all flags which could take hardware and GPU acceleation into consideration.
  I did ./configure --help inside the ffmpeg source, I see below list option, can you please tell which all can really imporve the performance. Note that we would like to take advantage of hardware and gpu capabilities.

      $ ./configure —help
  
      Usage : configure [options]
  
      Options : [defaults in brackets after descriptions]
      Help options :
  
        —help                   print this message
  
        —quiet                  Suppress showing informative output
  
        —list-decoders          show all available decoders
  
        —list-encoders          show all available encoders
  
        —list-hwaccels          show all available hardware accelerators
  
        —list-demuxers          show all available demuxers
  
        —list-muxers            show all available muxers
  
        —list-parsers           show all available parsers
  
        —list-protocols         show all available protocols
  
        —list-bsfs              show all available bitstream filters
  
        —list-indevs            show all available input devices
  
        —list-outdevs           show all available output devices
  
        —list-filters           show all available filters
      Standard options :
  
        —logfile=FILE           log tests and output to FILE [ffbuild/config.log]
  
        —disable-logging        do not log configure debug information
  
        —fatal-warnings         fail if any configure warning is generated
  
        —prefix=PREFIX          install in PREFIX [/usr/local]
  
        —bindir=DIR             install binaries in DIR [PREFIX/bin]
  
        —datadir=DIR            install data files in DIR [PREFIX/share/ffmpeg]
  
        —docdir=DIR             install documentation in DIR [PREFIX/share/doc/ffmpeg                                                                                                      ]
  
        —libdir=DIR             install libs in DIR [PREFIX/lib]
  
        —shlibdir=DIR           install shared libs in DIR [LIBDIR]
  
        —incdir=DIR             install includes in DIR [PREFIX/include]
  
        —mandir=DIR             install man page in DIR [PREFIX/share/man]
  
        —pkgconfigdir=DIR       install pkg-config files in DIR [LIBDIR/pkgconfig]
  
        —enable-rpath           use rpath to allow installing libraries in paths
  
                                 not part of the dynamic linker search path
  
                                 use rpath when linking programs (USE WITH CARE)
  
        —install-name-dir=DIR   Darwin directory name for installed targets
      Licensing options :
  
        —enable-gpl             allow use of GPL code, the resulting libs
  
                                 and binaries will be under GPL [no]
  
        —enable-version3        upgrade (L)GPL to version 3 [no]
  
        —enable-nonfree         allow use of nonfree code, the resulting libs
  
                                 and binaries will be unredistributable [no]
      Configuration options :
  
        —disable-static         do not build static libraries [no]
  
        —enable-shared          build shared libraries [no]
  
        —enable-small           optimize for size instead of speed
  
        —disable-runtime-cpudetect disable detecting CPU capabilities at runtime (sma                                                                                                      ller binary)
  
        —enable-gray            enable full grayscale support (slower color)
  
        —disable-swscale-alpha  disable alpha channel support in swscale
  
        —disable-all            disable building components, libraries and programs
  
        —disable-autodetect     disable automatically detected external libraries [no                                                                                                      ]
      Program options :
  
        —disable-programs       do not build command line programs
  
        —disable-ffmpeg         disable ffmpeg build
  
        —disable-ffplay         disable ffplay build
  
        —disable-ffprobe        disable ffprobe build
  
        —disable-ffserver       disable ffserver build
      Documentation options :
  
        —disable-doc            do not build documentation
  
        —disable-htmlpages      do not build HTML documentation pages
  
        —disable-manpages       do not build man documentation pages
  
        —disable-podpages       do not build POD documentation pages
  
        —disable-txtpages       do not build text documentation pages
      Component options :
  
        —disable-avdevice       disable libavdevice build
  
        —disable-avcodec        disable libavcodec build
  
        —disable-avformat       disable libavformat build
  
        —disable-swresample     disable libswresample build
  
        —disable-swscale        disable libswscale build
  
        —disable-postproc       disable libpostproc build
  
        —disable-avfilter       disable libavfilter build
  
        —enable-avresample      enable libavresample build [no]
  
        —disable-pthreads       disable pthreads [autodetect]
  
        —disable-w32threads     disable Win32 threads [autodetect]
  
        —disable-os2threads     disable OS/2 threads [autodetect]
  
        —disable-network        disable network support [no]
  
        —disable-dct            disable DCT code
  
        —disable-dwt            disable DWT code
  
        —disable-error-resilience disable error resilience code
  
        —disable-lsp            disable LSP code
  
        —disable-lzo            disable LZO decoder code
  
        —disable-mdct           disable MDCT code
  
        —disable-rdft           disable RDFT code
  
        —disable-fft            disable FFT code
  
        —disable-faan           disable floating point AAN (I)DCT code
  
        —disable-pixelutils     disable pixel utils in libavutil
      Individual component options :
  
        —disable-everything     disable all components listed below
  
        —disable-encoder=NAME   disable encoder NAME
  
        —enable-encoder=NAME    enable encoder NAME
  
        —disable-encoders       disable all encoders
  
        —disable-decoder=NAME   disable decoder NAME
  
        —enable-decoder=NAME    enable decoder NAME
  
        —disable-decoders       disable all decoders
  
        —disable-hwaccel=NAME   disable hwaccel NAME
  
        —enable-hwaccel=NAME    enable hwaccel NAME
  
        —disable-hwaccels       disable all hwaccels
  
        —disable-muxer=NAME     disable muxer NAME
  
        —enable-muxer=NAME      enable muxer NAME
  
        —disable-muxers         disable all muxers
  
        —disable-demuxer=NAME   disable demuxer NAME
  
        —enable-demuxer=NAME    enable demuxer NAME
  
        —disable-demuxers       disable all demuxers
  
        —enable-parser=NAME     enable parser NAME
  
        —disable-parser=NAME    disable parser NAME
  
        —disable-parsers        disable all parsers
  
        —enable-bsf=NAME        enable bitstream filter NAME
  
        —disable-bsf=NAME       disable bitstream filter NAME
  
        —disable-bsfs           disable all bitstream filters
  
        —enable-protocol=NAME   enable protocol NAME
  
        —disable-protocol=NAME  disable protocol NAME
  
        —disable-protocols      disable all protocols
  
        —enable-indev=NAME      enable input device NAME
  
        —disable-indev=NAME     disable input device NAME
  
        —disable-indevs         disable input devices
  
        —enable-outdev=NAME     enable output device NAME
  
        —disable-outdev=NAME    disable output device NAME
  
        —disable-outdevs        disable output devices
  
        —disable-devices        disable all devices
  
        —enable-filter=NAME     enable filter NAME
  
        —disable-filter=NAME    disable filter NAME
  
        —disable-filters        disable all filters
  
        —disable-v4l2_m2m       disable V4L2 mem2mem code [autodetect]
      External library support :
        Using any of the following switches will allow FFmpeg to link to the
  
        corresponding external library. All the components depending on that library
  
        will become enabled, if all their other dependencies are met and they are not
  
        explicitly disabled. E.g. —enable-libwavpack will enable linking to
  
        libwavpack and allow the libwavpack encoder to be built, unless it is
  
        specifically disabled with —disable-encoder=libwavpack.
        Note that only the system libraries are auto-detected. All the other external
  
        libraries must be explicitly enabled.
        Also note that the following help text describes the purpose of the libraries
  
        themselves, not all their features will necessarily be usable by FFmpeg.
        —disable-alsa           disable ALSA support [autodetect]
  
        —disable-appkit         disable Apple AppKit framework [autodetect]
  
        —disable-avfoundation   disable Apple AVFoundation framework [autodetect]
  
        —enable-avisynth        enable reading of AviSynth script files [no]
  
        —disable-bzlib          disable bzlib [autodetect]
  
        —disable-coreimage      disable Apple CoreImage framework [autodetect]
  
        —enable-chromaprint     enable audio fingerprinting with chromaprint [no]
  
        —enable-frei0r          enable frei0r video filtering [no]
  
        —enable-gcrypt          enable gcrypt, needed for rtmp(t)e support
  
                                 if openssl, librtmp or gmp is not used [no]
  
        —enable-gmp             enable gmp, needed for rtmp(t)e support
  
                                 if openssl or librtmp is not used [no]
  
        —enable-gnutls          enable gnutls, needed for https support
  
                                 if openssl is not used [no]
  
        —disable-iconv          disable iconv [autodetect]
  
        —disable-jack           disable libjack support [autodetect]
  
        —enable-jni             enable JNI support [no]
  
        —enable-ladspa          enable LADSPA audio filtering [no]
  
        —enable-libass          enable libass subtitles rendering,
  
                                 needed for subtitles and ass filter [no]
  
        —enable-libbluray       enable BluRay reading using libbluray [no]
  
        —enable-libbs2b         enable bs2b DSP library [no]
  
        —enable-libcaca         enable textual display using libcaca [no]
  
        —enable-libcelt         enable CELT decoding via libcelt [no]
  
        —enable-libcdio         enable audio CD grabbing with libcdio [no]
  
        —enable-libdc1394       enable IIDC-1394 grabbing using libdc1394
  
                                 and libraw1394 [no]
  
        —enable-libfdk-aac      enable AAC de/encoding via libfdk-aac [no]
  
        —enable-libflite        enable flite (voice synthesis) support via libflite [                                                                                                      no]
  
        —enable-libfontconfig   enable libfontconfig, useful for drawtext filter [no]
  
        —enable-libfreetype     enable libfreetype, needed for drawtext filter [no]
  
        —enable-libfribidi      enable libfribidi, improves drawtext filter [no]
  
        —enable-libgme          enable Game Music Emu via libgme [no]
  
        —enable-libgsm          enable GSM de/encoding via libgsm [no]
  
        —enable-libiec61883     enable iec61883 via libiec61883 [no]
  
        —enable-libilbc         enable iLBC de/encoding via libilbc [no]
  
        —enable-libkvazaar      enable HEVC encoding via libkvazaar [no]
  
        —enable-libmodplug      enable ModPlug via libmodplug [no]
  
        —enable-libmp3lame      enable MP3 encoding via libmp3lame [no]
  
        —enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no                                                                                                      ]
  
        —enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]
  
        —enable-libopencv       enable video filtering via libopencv [no]
  
        —enable-libopenh264     enable H.264 encoding via OpenH264 [no]
  
        —enable-libopenjpeg     enable JPEG 2000 de/encoding via OpenJPEG [no]
  
        —enable-libopenmpt      enable decoding tracked files via libopenmpt [no]
  
        —enable-libopus         enable Opus de/encoding via libopus [no]
  
        —enable-libpulse        enable Pulseaudio input via libpulse [no]
  
        —enable-librsvg         enable SVG rasterization via librsvg [no]
  
        —enable-librubberband   enable rubberband needed for rubberband filter [no]
  
        —enable-librtmp         enable RTMP[E] support via librtmp [no]
  
        —enable-libshine        enable fixed-point MP3 encoding via libshine [no]
  
        —enable-libsmbclient    enable Samba protocol via libsmbclient [no]
  
        —enable-libsnappy       enable Snappy compression, needed for hap encoding [n                                                                                                      o]
  
        —enable-libsoxr         enable Include libsoxr resampling [no]
  
        —enable-libspeex        enable Speex de/encoding via libspeex [no]
  
        —enable-libssh          enable SFTP protocol via libssh [no]
  
        —enable-libtesseract    enable Tesseract, needed for ocr filter [no]
  
        —enable-libtheora       enable Theora encoding via libtheora [no]
  
        —enable-libtwolame      enable MP2 encoding via libtwolame [no]
  
        —enable-libv4l2         enable libv4l2/v4l-utils [no]
  
        —enable-libvidstab      enable video stabilization using vid.stab [no]
  
        —enable-libvmaf         enable vmaf filter via libvmaf [no]
  
        —enable-libvo-amrwbenc  enable AMR-WB encoding via libvo-amrwbenc [no]
  
        —enable-libvorbis       enable Vorbis en/decoding via libvorbis,
  
                                 native implementation exists [no]
  
        —enable-libvpx          enable VP8 and VP9 de/encoding via libvpx [no]
  
        —enable-libwavpack      enable wavpack encoding via libwavpack [no]
  
        —enable-libwebp         enable WebP encoding via libwebp [no]
  
        —enable-libx264         enable H.264 encoding via x264 [no]
  
        —enable-libx265         enable HEVC encoding via x265 [no]
  
        —enable-libxavs         enable AVS encoding via xavs [no]
  
        —enable-libxcb          enable X11 grabbing using XCB [autodetect]
  
        —enable-libxcb-shm      enable X11 grabbing shm communication [autodetect]
  
        —enable-libxcb-xfixes   enable X11 grabbing mouse rendering [autodetect]
  
        —enable-libxcb-shape    enable X11 grabbing shape rendering [autodetect]
  
        —enable-libxvid         enable Xvid encoding via xvidcore,
  
                                 native MPEG-4/Xvid encoder exists [no]
  
        —enable-libxml2         enable XML parsing using the C library libxml2 [no]
  
        —enable-libzimg         enable z.lib, needed for zscale filter [no]
  
        —enable-libzmq          enable message passing via libzmq [no]
  
        —enable-libzvbi         enable teletext support via libzvbi [no]
  
        —disable-lzma           disable lzma [autodetect]
  
        —enable-decklink        enable Blackmagic DeckLink I/O support [no]
  
        —enable-libndi_newtek   enable Newteck NDI I/O support [no]
  
        —enable-mediacodec      enable Android MediaCodec support [no]
  
        —enable-libmysofa       enable libmysofa, needed for sofalizer filter [no]
  
        —enable-openal          enable OpenAL 1.1 capture support [no]
  
        —enable-opencl          enable OpenCL code
  
        —enable-opengl          enable OpenGL rendering [no]
  
        —enable-openssl         enable openssl, needed for https support
  
                                 if gnutls is not used [no]
  
        —disable-sndio          disable sndio support [autodetect]
  
        —disable-schannel       disable SChannel SSP, needed for TLS support on
  
                                 Windows if openssl and gnutls are not used [autodetec                                                                                                      t]
  
        —disable-sdl2           disable sdl2 [autodetect]
  
        —disable-securetransport disable Secure Transport, needed for TLS support
  
                                 on OSX if openssl and gnutls are not used [autodetect                                                                                                      ]
  
        —disable-xlib           disable xlib [autodetect]
  
        —disable-zlib           disable zlib [autodetect]
        The following libraries provide various hardware acceleration features :
  
        —disable-audiotoolbox   disable Apple AudioToolbox code [autodetect]
  
        —disable-cuda           disable dynamically linked Nvidia CUDA code [autodete                                                                                                      ct]
  
        —enable-cuda-sdk        enable CUDA features that require the CUDA SDK [no]
  
        —disable-cuvid          disable Nvidia CUVID support [autodetect]
  
        —disable-d3d11va        disable Microsoft Direct3D 11 video acceleration code                                                                                                       [autodetect]
  
        —disable-dxva2          disable Microsoft DirectX 9 video acceleration code [                                                                                                      autodetect]
  
        —enable-libdrm          enable DRM code (Linux) [no]
  
        —enable-libmfx          enable Intel MediaSDK (AKA Quick Sync Video) code via                                                                                                       libmfx [no]
  
        —enable-libnpp          enable Nvidia Performance Primitives-based code [no]
  
        —enable-mmal            enable Broadcom Multi-Media Abstraction Layer (Raspbe                                                                                                      rry Pi) via MMAL [no]
  
        —disable-nvenc          disable Nvidia video encoding code [autodetect]
  
        —enable-omx             enable OpenMAX IL code [no]
  
        —enable-omx-rpi         enable OpenMAX IL code for Raspberry Pi [no]
  
        —enable-rkmpp           enable Rockchip Media Process Platform code [no]
  
        —disable-vaapi          disable Video Acceleration API (mainly Unix/Intel) co                                                                                                      de [autodetect]
  
        —disable-vda            disable Apple Video Decode Acceleration code [autodet                                                                                                      ect]
  
        —disable-vdpau          disable Nvidia Video Decode and Presentation API for                                                                                                       Unix code [autodetect]
  
        —disable-videotoolbox   disable VideoToolbox code [autodetect]
      Toolchain options :
  
        —arch=ARCH              select architecture []
  
        —cpu=CPU                select the minimum required CPU (affects
  
                                 instruction selection, may crash on older CPUs)
  
        —cross-prefix=PREFIX    use PREFIX for compilation tools []
  
        —progs-suffix=SUFFIX    program name suffix []
  
        —enable-cross-compile   assume a cross-compiler is used
  
        —sysroot=PATH           root of cross-build tree
  
        —sysinclude=PATH        location of cross-build system headers
  
        —target-os=OS           compiler targets OS []
  
        —target-exec=CMD        command to run executables on target
  
        —target-path=DIR        path to view of build directory on target
  
        —target-samples=DIR     path to samples directory on target
  
        —tempprefix=PATH        force fixed dir/prefix instead of mktemp for checks
  
        —toolchain=NAME         set tool defaults according to NAME
  
        —nm=NM                  use nm tool NM [nm -g]
  
        —ar=AR                  use archive tool AR [ar]
  
        —as=AS                  use assembler AS []
  
        —ln_s=LN_S              use symbolic link tool LN_S [ln -s -f]
  
        —strip=STRIP            use strip tool STRIP [strip]
  
        —windres=WINDRES        use windows resource compiler WINDRES [windres]
  
        —x86asmexe=EXE          use nasm-compatible assembler EXE [nasm]
  
        —cc=CC                  use C compiler CC [gcc]
  
        —cxx=CXX                use C compiler CXX [g++]
  
        —objcc=OCC              use ObjC compiler OCC [gcc]
  
        —dep-cc=DEPCC           use dependency generator DEPCC [gcc]
  
        —nvcc=NVCC              use Nvidia CUDA compiler NVCC [nvcc]
  
        —ld=LD                  use linker LD []
  
        —pkg-config=PKGCONFIG   use pkg-config tool PKGCONFIG [pkg-config]
  
        —pkg-config-flags=FLAGS pass additional flags to pkgconf []
  
        —ranlib=RANLIB          use ranlib RANLIB [ranlib]
  
        —doxygen=DOXYGEN        use DOXYGEN to generate API doc [doxygen]
  
        —host-cc=HOSTCC         use host C compiler HOSTCC
  
        —host-cflags=HCFLAGS    use HCFLAGS when compiling for host
  
        —host-cppflags=HCPPFLAGS use HCPPFLAGS when compiling for host
  
        —host-ld=HOSTLD         use host linker HOSTLD
  
        —host-ldflags=HLDFLAGS  use HLDFLAGS when linking for host
  
        —host-libs=HLIBS        use libs HLIBS when linking for host
  
        —host-os=OS             compiler host OS []
  
        —extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS []
  
        —extra-cxxflags=ECFLAGS add ECFLAGS to CXXFLAGS []
  
        —extra-objcflags=FLAGS  add FLAGS to OBJCFLAGS []
  
        —extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS []
  
        —extra-ldexeflags=ELDFLAGS add ELDFLAGS to LDEXEFLAGS []
  
        —extra-ldlibflags=ELDFLAGS add ELDFLAGS to LDLIBFLAGS []
  
        —extra-libs=ELIBS       add ELIBS []
  
        —extra-version=STRING   version string suffix []
  
        —optflags=OPTFLAGS      override optimization-related compiler flags
  
        —nvccflags=NVCCFLAGS    override nvcc flags [-gencode arch=compute_30,code=sm                                                                                                      _30 -O2]
  
        —build-suffix=SUFFIX    library name suffix []
  
        —enable-pic             build position-independent code
  
        —enable-thumb           compile for Thumb instruction set
  
        —enable-lto             use link-time optimization
  
        —env="ENV=override"     override the environment variables
      Advanced options (experts only) :
  
        —malloc-prefix=PREFIX   prefix malloc and related names with PREFIX
  
        —custom-allocator=NAME  use a supported custom allocator
  
        —disable-symver         disable symbol versioning
  
        —enable-hardcoded-tables use hardcoded tables instead of runtime generation
  
        —disable-safe-bitstream-reader
  
                                 disable buffer boundary checking in bitreaders
  
                                 (faster, but may crash)
  
        —sws-max-filter-size=N  the max filter size swscale uses [256]
      Optimization options (experts only) :
  
        —disable-asm            disable all assembly optimizations
  
        —disable-altivec        disable AltiVec optimizations
  
        —disable-vsx            disable VSX optimizations
  
        —disable-power8         disable POWER8 optimizations
  
        —disable-amd3dnow       disable 3DNow ! optimizations
  
        —disable-amd3dnowext    disable 3DNow ! extended optimizations
  
        —disable-mmx            disable MMX optimizations
  
        —disable-mmxext         disable MMXEXT optimizations
  
        —disable-sse            disable SSE optimizations
  
        —disable-sse2           disable SSE2 optimizations
  
        —disable-sse3           disable SSE3 optimizations
  
        —disable-ssse3          disable SSSE3 optimizations
  
        —disable-sse4           disable SSE4 optimizations
  
        —disable-sse42          disable SSE4.2 optimizations
  
        —disable-avx            disable AVX optimizations
  
        —disable-xop            disable XOP optimizations
  
        —disable-fma3           disable FMA3 optimizations
  
        —disable-fma4           disable FMA4 optimizations
  
        —disable-avx2           disable AVX2 optimizations
  
        —disable-aesni          disable AESNI optimizations
  
        —disable-armv5te        disable armv5te optimizations
  
        —disable-armv6          disable armv6 optimizations
  
        —disable-armv6t2        disable armv6t2 optimizations
  
        —disable-vfp            disable VFP optimizations
  
        —disable-neon           disable NEON optimizations
  
        —disable-inline-asm     disable use of inline assembly
  
        —disable-x86asm         disable use of standalone x86 assembly
  
        —disable-mipsdsp        disable MIPS DSP ASE R1 optimizations
  
        —disable-mipsdspr2      disable MIPS DSP ASE R2 optimizations
  
        —disable-msa            disable MSA optimizations
  
        —disable-mipsfpu        disable floating point MIPS optimizations
  
        —disable-mmi            disable Loongson SIMD optimizations
  
        —disable-fast-unaligned consider unaligned accesses slow
      Developer options (useful when working on FFmpeg itself) :
  
        —disable-debug          disable debugging symbols
  
        —enable-debug=LEVEL     set the debug level []
  
        —disable-optimizations  disable compiler optimizations
  
        —enable-extra-warnings  enable more compiler warnings
  
        —disable-stripping      disable stripping of executables and shared libraries
  
        —assert-level=level     0(default), 1 or 2, amount of assertion testing,
  
                                 2 causes a slowdown at runtime.
  
        —enable-memory-poisoning fill heap uninitialized allocated space with arbitra                                                                                                      ry data
  
        —valgrind=VALGRIND      run "make fate" tests through valgrind to detect memo                                                                                                      ry
  
                                 leaks and errors, using the specified valgrind binary                                                                                                      .
  
                                 Cannot be combined with —target-exec
  
        —enable-ftrapv          Trap arithmetic overflows
  
        —samples=PATH           location of test samples for FATE, if not set use
  
                                 $FATE_SAMPLES at make invocation time.
  
        —enable-neon-clobber-test check NEON registers for clobbering (should be
  
                                 used only for debugging purposes)
  
        —enable-xmm-clobber-test check XMM registers for clobbering (Win64-only ;
  
                                 should be used only for debugging purposes)
  
        —enable-random          randomly enable/disable components
  
        —disable-random
  
        —enable-random=LIST     randomly enable/disable specific components or
  
        —disable-random=LIST    component groups. LIST is a comma-separated list
  
                                 of NAME[:PROB] entries where NAME is a component
  
                                 (group) and PROB the probability associated with
  
                                 NAME (default 0.5).
  
        —random-seed=VALUE      seed value for —enable/disable-random
  
        —disable-valgrind-backtrace do not print a backtrace under Valgrind
  
                                 (only applies to —disable-optimizations builds)
  
        —enable-osfuzz          Enable building fuzzer tool
  
        —libfuzzer=PATH         path to libfuzzer
  
        —ignore-tests=TESTS     comma-separated list (without "fate-" prefix
  
                                 in the name) of tests whose result is ignored
  
        —enable-linux-perf      enable Linux Performance Monitor API
      NOTE : Object files are built at the place where configure is launched.