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Sur d’autres sites (4358)

  • FFMPEG rotation metadata sometimes goes clockwise and sometimes goes counterclockwise

    8 avril 2020, par John Allard

    I have two different machines with two different versions of ffmpeg installed. I'm trying to set the display matrix of a video to have a rotation value by using the -metadata:s:v:0 rotate=$theta filter.

    



    On machine #1

    



    FFMPEG version :

    



    $ ffmpeg -version
ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
built with Apple clang version 11.0.0 (clang-1100.0.33.8)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
libavutil      56. 31.100 / 56. 31.100
libavcodec     58. 54.100 / 58. 54.100
libavformat    58. 29.100 / 58. 29.100
libavdevice    58.  8.100 / 58.  8.100
libavfilter     7. 57.100 /  7. 57.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  5.100 /  5.  5.100
libswresample   3.  5.100 /  3.  5.100
libpostproc    55.  5.100 / 55.  5.100


    



    Command :

    



    $ ffmpeg -i 0_degree_rotation.mp4 -vcodec copy -metadata:s:v:0 rotate=90 /tmp/out.mp4


    



    Metadata on output video :

    



    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : "Camio"
    encoder         : Lavf58.29.100
  Duration: 00:00:10.71, start: 0.000000, bitrate: 2241 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2239 kb/s, 14.94 fps, 14.94 tbr, 14941 tbn, 29.88 tbc (default)
    Metadata:
      rotate          : 270
      handler_name    : VideoHandler
    Side data:
      displaymatrix: rotation of 90.00 degrees


    



    On Machine #2

    



    FFMPEG Version :

    



    ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
libavutil      54. 31.100 / 54. 31.100
libavcodec     56. 60.100 / 56. 60.100
libavformat    56. 40.101 / 56. 40.101
libavdevice    56.  4.100 / 56.  4.100
libavfilter     5. 40.101 /  5. 40.101
libavresample   2.  1.  0 /  2.  1.  0
libswscale      3.  1.101 /  3.  1.101
libswresample   1.  2.101 /  1.  2.101
libpostproc    53.  3.100 / 53.  3.100


    



    Command :

    



    $ ffmpeg -i /tmp/0_degree_rotation.mp4 -vcodec copy -metadata:s:v:0 rotate=90 /tmp/out.mp4


    



    Metadata on output video

    



    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : "Camio"
    encoder         : Lavf56.40.101
  Duration: 00:00:10.71, start: 0.000000, bitrate: 2241 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2239 kb/s, 14.94 fps, 14.94 tbr, 14941 tbn, 29.88 tbc (default)
    Metadata:
      rotate          : 90
      handler_name    : VideoHandler
    Side data:
      displaymatrix: rotation of -90.00 degrees


    



    Why does the same command produce a rotation of +90 degrees in one version of ffmpeg and -90 degrees on a different version ?

    


  • Capturing audio and video from different sources, how to sync ?

    16 février 2017, par aerodavo

    Here is my code :

    Lapaki:~ Lapaki$ /Users/Lapaki/Desktop/ffmpeg -f avfoundation -video_size 960x540 -pixel_format uyvy422 -framerate ntsc -thread_queue_size 8B -i "XI:none" -f avfoundation -thread_queue_size 8B -i "none:XI" -vf 'crop=iw-240:ih:120:0' -af 'asetpts=PTS+.58735/TB' -pix_fmt yuv420p -aspect 4:3 -s 720x480 -q:v 3 -maxrate 5000k -bufsize 2000k -acodec ac3 -ac 2 -ab 256k -ar 48000 -f dvd /Users/Lapaki/Desktop/FF\ Test/`date +%F`\ `date +%H_%M_%S`.mpg
    
ffmpeg version 3.2.3-tessus Copyright (c) 2000-2017 the FFmpeg developers
    
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
    
  libavutil      55. 34.101 / 55. 34.101
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.101 / 57. 56.101
    
  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
    
Input #0, avfoundation, from 'XI:none':
    
  Duration: N/A, start: 648413.295900, bitrate: N/A
    
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 960x540, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc
    
Input #1, avfoundation, from 'none:XI':
    
  Duration: N/A, start: 648413.884042, bitrate: 3072 kb/s
    
    Stream #1:0: Audio: pcm_f32le, 48000 Hz, stereo, flt, 3072 kb/s
    
Output #0, dvd, to '/Users/Lapaki/Desktop/FF Test/2017-02-16 04_16_33.mpg':
    
  Metadata:
    
    encoder         : Lavf57.56.101
    
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
    
    Metadata:
    
      encoder         : Lavc57.64.101 mpeg2video
    
    Side data:
    
      cpb: bitrate max/min/avg: 5000000/0/200000 buffer size: 2000000 vbv_delay: -1
    
    Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
    
    Metadata:
    
      encoder         : Lavc57.64.101 ac3
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native))
    
  Stream #1:0 -> #0:1 (pcm_f32le (native) -> ac3 (native))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x7f8e0c8ab400] Warning: data is not aligned! This can lead to a speedloss
    
frame=   33 fps=0.0 q=3.0 size=     266kB time=00:00:01.06 bitrate=2051.9kbits/sframe=   49 fps= 48 q=3.0 size=     444kB time=00:00:01.54 bitrate=2358.8kbits/sframe=   64 fps= 42 q=3.0 size=     652kB time=00:00:02.08 bitrate=2560.5kbits/sframe=   79 fps= 39 q=3.0 size=     838kB time=00:00:02.59 bitrate=2642.4kbits/sframe=   94 fps= 37 q=3.0 size=    1022kB time=00:00:03.07 bitrate=2720.0kbits/sframe=  109 fps= 36 q=3.0 size=    1208kB time=00:00:03.59 bitrate=2756.5kbits/sframe=  124 fps= 35 q=3.0 size=    1406kB time=00:00:04.07 bitrate=2830.0kbits/sframe=  127 fps= 35 q=3.0 Lsize=    1474kB time=00:00:04.19 bitrate=2876.4kbits/s dup=12 drop=0 speed=1.15x    
    
video:1310kB audio:113kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.604597%

    The start of Input #0 is 648413.295900, and the start of Input #1 is 648413.884042.

    I’ve been able to keep the audio and video in very close sync by subtracting the two values (which I assume are wallclock values), and using the asetpts audio filter to delay the audio stream of the recorded mpeg-2 file by that amount.

    I’d like to be able to do this exactly though, and that value changes slightly every time I start a new capture. Not to mention, I’d like to be able to do this reliably on different machines, where I assume the value will most likely be different, thus using a calculation as opposed to a fixed number is obviously the best option, if it’s possible.

    Is there a way to subtract the wallclock start time of input #0 from the wallclock start time of input #1 ? I’d like to do this inside the asetpts filter, instead of manually finding the difference from a previous run, which again is slightly different every time...

    I was thinking something like -af asetpts=PTS-([1:0]RTCSTART-[0:0]RTCSTART)/TB might work, but I have no idea how to format it.

    Thanks in advance !

  • Ffmpeg performance issue when transcoding to webm

    9 juin 2017, par Algold

    I have recently updated ffmpeg from version 2.0.2 to the most recent release 2.7. I installed it using the same building configuration as the old version and the same codecs version (libvpx and h264). When I tried to transcode an mp4 video to webm, I found out that the speed of the new version is significantly lower (3 times) than the old one. I run this on two identical 8 core machines (Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz) - OS : Ubuntu 14.04. Below is the command I run :

    /usr/local/bin/ffmpeg -i in.mp4 -f webm -vcodec libvpx -b:v 1000K out.webm

    These are the outputs for the two versions :

    v 2.0.2

    ffmpeg version 2.0.2 Copyright (c) 2000-2013 the FFmpeg developers
    
built on Jan  7 2015 13:51:25 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
    
configuration: --disable-ffplay --disable-ffserver --enable-libxvid --enable-gpl --enable-nonfree --enable-pthreads --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-zlib --enable-avfilter --enable-libfreetype --enable-libfdk_aac --enable-libtheora --enable-libvorbis --enable-libvpx --enable-pic --enable-shared  
    
libavutil      52. 38.100 / 52. 38.100
    
libavcodec     55. 18.102 / 55. 18.102
    
libavformat    55. 12.100 / 55. 12.100
    
libavdevice    55.  3.100 / 55.  3.100
    
libavfilter     3. 79.101 /  3. 79.101
    
libswscale      2.  3.100 /  2.  3.100
    
libswresample   0. 17.102 /  0. 17.102
    
libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
    
Metadata:
    
major_brand     : isom
    
minor_version   : 512
    
compatible_brands: isomiso2avc1mp41
    
encoder         : Lavf55.12.100
    
Duration: 00:00:10.19, start: 0.000000, bitrate: 1724 kb/s
    
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1480 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
Metadata:
    
  handler_name    : VideoHandler
    
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 253 kb/s
    
Metadata:
    
  handler_name    : SoundHandler
    
[libvpx @ 0x22f3760] v1.3.0
    
Output #0, webm, to 'out.webm':
    
Metadata:
    
major_brand     : isom
    
minor_version   : 512
    
compatible_brands: isomiso2avc1mp41
    
encoder         : Lavf55.12.100
    
Stream #0:0(und): Video: vp8 (libvpx), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 1000 kb/s, 1k tbn, 29.97 tbc
    
Metadata:
    
  handler_name    : VideoHandler
    
Stream #0:1(und): Audio: vorbis (libvorbis), 44100 Hz, stereo, fltp
    
Metadata:
    
  handler_name    : SoundHandler
    
Stream mapping:
    
Stream #0:0 -> #0:0 (h264 -> libvpx)
    
Stream #0:1 -> #0:1 (aac -> libvorbis)
    
Press [q] to stop, [?] for help
    
frame=  302 fps= 23 q=0.0 Lsize=    1445kB time=00:00:10.18 bitrate=1161.9kbits/s    
    
video:1304kB audio:128kB subtitle:0 global headers:4kB muxing overhead 0.644833%

    v 2.7

    ffmpeg version 2.7 Copyright (c) 2000-2015 the FFmpeg developer built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
    
  configuration: --disable-ffplay --disable-ffserver --enable-libxvid --enable-gpl --enable-nonfree --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-zlib --enable-libass --enable-pthreads --enable-avfilter --enable-libfreetype --enable-libfdk_aac --enable-libtheora --enable-libvorbis --enable-libvpx --enable-pic --enable-shared --enable-openssl
    
  libavutil      54. 27.100 / 54. 27.100
    
  libavcodec     56. 41.100 / 56. 41.100
    
  libavformat    56. 36.100 / 56. 36.100
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 16.101 /  5. 16.101
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.100 /  1.  2.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.36.100
    
  Duration: 00:00:10.19, start: 0.000000, bitrate: 1596 kb/s
    
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1480 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
[libvpx @ 0xfe4640] v1.3.0
    
Output #0, webm, to 'out.webm':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.36.100
    
    Stream #0:0(und): Video: vp8 (libvpx), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 1000 kb/s, 29.97 fps, 1k tbn, 29.97 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc56.41.100 libvpx
    
    Stream #0:1(und): Audio: vorbis (libvorbis), 44100 Hz, stereo, fltp (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
      encoder         : Lavc56.41.100 libvorbis
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> vp8 (libvpx))
    
  Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))
    
Press [q] to stop, [?] for help
    
frame=  302 fps=8.3 q=0.0 Lsize=    1410kB time=00:00:10.18 bitrate=1133.4kbits/s    
    
video:1274kB audio:123kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 0.909304%

    I tried ffmpeg 2.6.3 and the performance the same as for 2.7. Also it looks like when I transcode webm to mp4 2.7 is 30% faster than webm.

    I tried to look if there are building configuration options for the new version but couldn’t find anything.

    Can anyone suggest a possible reason for the worse speed performance of the new version when transcoding to webm ?

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