Recherche avancée

Sur d’autres sites (5268)

• libavcodec/aacsbr_tablegen : fix tablegen on windows

  2 décembre 2015, par Hendrik Leppkes

  libavcodec/aacsbr_tablegen : fix tablegen on windows
  Including these headers is not needed and breaks building on Windows as it
  
  tries to activate the full compat tools, which are not needed for host
  
  tools.
  

  • [DH] libavcodec/aacsbr_fixed_tablegen.c
  • [DH] libavcodec/aacsbr_tablegen.c
  • [DH] libavcodec/aacsbr_tablegen_common.h

• Using ffmpeg on Windows, what is the command to capture hardware encoded H264 stream from Logitech c930e

  2 mai 2015, par Jeff

  I am using ffmpeg on Windows 8 and I would like to capture the built-in H264 hardware encoded stream from the Logitech c930e camera. The H264 built-in encoded stream is part of the UVC 1.5 interface.

  Using this command I have noticed that the c930e exposes two video pins through DirectShow : 0 and 1.

  ffmpeg -report -list_options true -f dshow -i video="Logitech Webcam C930e"

  [dshow @ 0000000002d89360]  Pin "Capture" (alternative pin name "0")

  [dshow @ 0000000002d89360]  Pin "Capture" (alternative pin name "1")

  It doesn’t seem to matter if I choose Pin 0 or 1, I still get raw video from the Logitech c930e webcam. On Linux, the supposed command involves v4l2, but this does not appear to exist in the default Windows version of ffmpeg from http://ffmpeg.zeranoe.com/builds/

  Does the default Windows build of ffmpeg support the direct capture of the UVC interface ?

  This is the closest I have gotten on this journey, but still isn’t quite right :

  ffmpeg -report -f dshow -i video="Logitech Webcam C930e" -s 1920x1080 -r 30 -video_pin_name 1 -vcodec H264 -c copy -f mp4 Logitechc930eFeed.mp4

  As of April 17, 2015 I am still trying to figure this out and have two new pieces of info.

  I found this interesting article on Logitech’s website instructing the user to change the default Logitech driver to the generic USB Video Device driver :
  https://support.logitech.com/en_us/article/Install-native-UVC-drivers-for-your-Logitech-webcam?product=a0qi00000069v0MAAQ#

  I also found that my C930e had an older firmware (8.0.866), and Logitech recommends updating the firmware to 8.0.875 to fix an unspecified UVC H.264 issue.

  So now I have the latest firmware, and am using the generic "USB Video Device" on Windows 8.1.

  ffmpeg -list_devices true -f dshow -i

  which gives this output :

  ffmpeg version N-69608-g9dc45d1 Copyright (c) 2000-2015 the FFmpeg developers
 built with gcc 4.9.2 (GCC)
 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --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-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
 libavutil      54. 18.100 / 54. 18.100
 libavcodec     56. 21.102 / 56. 21.102
 libavformat    56. 19.100 / 56. 19.100
 libavdevice    56.  4.100 / 56.  4.100
 libavfilter     5.  9.103 /  5.  9.103
 libswscale      3.  1.101 /  3.  1.101
 libswresample   1.  1.100 /  1.  1.100
 libpostproc    53.  3.100 / 53.  3.100
[dshow @ 00000000045c9360] DirectShow video devices (some may be both video and audio devices)
[dshow @ 00000000045c9360]  "Logitech Webcam C930e"
[dshow @ 00000000045c9360]     Alternative name "@device_pnp_\\?\usb#vid_046d&pid_0843&mi_00#7&3693c0e6&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 00000000045c9360] DirectShow audio devices
[dshow @ 00000000045c9360]  "Microphone (Logitech Webcam C930e)"
[dshow @ 00000000045c9360]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{BB8BE70B-4DDC-465F-9247-86E6EC98D627}"
dummy: Immediate exit requested

  And this command :
  ffmpeg -list_options true -f dshow -i video="Logitech Webcam C930e"

  still gives this output :

  ffmpeg version N-69608-g9dc45d1 Copyright (c) 2000-2015 the FFmpeg developers
 built with gcc 4.9.2 (GCC)
 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --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-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
 libavutil      54. 18.100 / 54. 18.100
 libavcodec     56. 21.102 / 56. 21.102
 libavformat    56. 19.100 / 56. 19.100
 libavdevice    56.  4.100 / 56.  4.100
 libavfilter     5.  9.103 /  5.  9.103
 libswscale      3.  1.101 /  3.  1.101
 libswresample   1.  1.100 /  1.  1.100
 libpostproc    53.  3.100 / 53.  3.100
[dshow @ 0000000004469360] DirectShow video device options (from video devices)
[dshow @ 0000000004469360]  Pin "Capture" (alternative pin name "0")
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x600 fps=5 max s=800x600 fps=24
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x600 fps=5 max s=800x600 fps=24
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=960x540 fps=5 max s=960x540 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=960x540 fps=5 max s=960x540 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1024x576 fps=5 max s=1024x576 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1024x576 fps=5 max s=1024x576 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1280x720 fps=5 max s=1280x720 fps=10
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1280x720 fps=5 max s=1280x720 fps=10
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1600x896 fps=5 max s=1600x896 fps=7.5
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1600x896 fps=5 max s=1600x896 fps=7.5
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1920x1080 fps=5 max s=1920x1080 fps=5
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1920x1080 fps=5 max s=1920x1080 fps=5
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x600 fps=5 max s=800x600 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x600 fps=5 max s=800x600 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=960x540 fps=5 max s=960x540 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=960x540 fps=5 max s=960x540 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1024x576 fps=5 max s=1024x576 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1024x576 fps=5 max s=1024x576 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1280x720 fps=5 max s=1280x720 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1280x720 fps=5 max s=1280x720 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1600x896 fps=5 max s=1600x896 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1600x896 fps=5 max s=1600x896 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1920x1080 fps=5 max s=1920x1080 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1920x1080 fps=5 max s=1920x1080 fps=30
[dshow @ 0000000004469360]  Pin "Capture" (alternative pin name "1")
video=Logitech Webcam C930e: Immediate exit requested

• Low latency video streaming on android

  17 mai 2021, par Louis Blenner

  I'd like to be able to stream the video from my webcam to an Android app with a latency below 500ms, on my local network.

  


  To capture and send the video over the network, I use ffmpeg.

  


  ffmpeg -f v4l2 -i /dev/video0 -preset ultrafast -tune zerolatency -vcodec libx264 -an -vf format=yuv420p -f mpegts  udp://192.168.1.155:5000


  


  This command takes the webcam as an input, convert it and send it to a device using the mpegts protocol.

  


  I am able to read the video on another PC with a latency below 500 ms, using commands like

  


  gst-launch-1.0 -v udpsrc port=5000 ! video/mpegts ! tsdemux ! h264parse ! avdec_h264 ! fpsdisplaysink sync=false


  


  or

  


  mpv udp://0.0.0.0:5000 --no-cache --untimed --no-demuxer-thread --video-sync=audio --vd-lavc-threads=1 


  


  So it is possible to have this range of latency.
  
I'd like to have the same thing on Android.

  


  Here are my tries to do that.

  


  Exoplayer

  


  After looking at the different players available on Android studio, it seems like Exoplayer is the go-to choice.
  
I tried different options indicated in the live-streaming documentation, but I always end up with a stream taking seconds to start and with a latency of seconds.
  
I tried to add a Button to seek to the default position of the windows, but it results in a loading of several seconds.

  


  DefaultExtractorsFactory extractorsFactory =
                new DefaultExtractorsFactory()
                        .setTsExtractorFlags(DefaultTsPayloadReaderFactory.FLAG_IGNORE_AAC_STREAM);

        player = new SimpleExoPlayer.Builder(this)
                .setMediaSourceFactory(
                        new DefaultMediaSourceFactory(this, extractorsFactory))
                .setLoadControl(new DefaultLoadControl.Builder()
                        .setBufferDurationsMs(DefaultLoadControl.DEFAULT_MIN_BUFFER_MS, DefaultLoadControl.DEFAULT_MAX_BUFFER_MS, 200, 200)
                        .build())
                .build();
        MyPlayerView playerView = findViewById(R.id.player_view);
        // Bind the player to the view.
        playerView.setPlayer(player);
        // Build the media item.
        MediaItem mediaItem = new MediaItem.Builder()
                .setUri(Uri.parse("udp://0.0.0.0:5000"))
                .setLiveMaxOffsetMs(500)
                .setLiveTargetOffsetMs(0)
                .setLiveMinOffsetMs(0)
                .build();
        // Set the media item to be played.
        player.setMediaItem(mediaItem);
        // Prepare the player.
        player.setPlayWhenReady(true);
        player.prepare();
        //player.seekToDefaultPosition();


  


  This issue is about the same issue and the conclusion was that Exoplayer was not fit for this use case.

  


  


  I'll be honest, ultra low-latency like this isn't ExoPlayer's main use-case

  


  


  Vlc

  


  Another try was to use the Vlc library.
  
But I was unable to have the same low latency stream as with the two previous example with Vlc.
  
I tried changing the preferences of Vlc to stream as fast as possible.

  


  Input/Codecs -> x264 preset: ultrafast - zerolatency
Input/Codecs -> Access Module: UDP input
Input/Codecs -> Clock Jitter: 500
Audio: disable audio


  


  I also tried reducing the different buffers.
  
However, I still have a latency of more than 1 seconds with that.

  


  Gstreamer

  


  Another try was to create a react-native project to use the different players available here.
  
One player that seemed promising was react-native-gstreamer because it uses gstreamer which is able to stream with low latency (gst-launch command).
  
But the library is now outdated.

  


  Question

  


  There were other tries, but none were successful.
  
Is there a problem with one of my approaches ?
  
And if not, Is there a player on Android (that I missed) which is able to achieve low latency stream like gstream or mpv on linux ?