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  • Contribute to translation

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Sur d’autres sites (10616)

  • Cannot Play Video Output of Libavcodec (ffmpeg) Encoding Example

    29 octobre 2019, par user3707763

    From FFMPEG’s GitHub, I use the encode_video.c to generate a 1 second video. Here is the example in question : https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/encode_video.c

    I compile with : gcc -Wall -o ffencode encode_video.c -lavcodec -lavutil -lz -lm

    Clean compile, zero warnings.

    I test the program by running : ./ffencode video.mp4 libx264

    Lots of stats printed out (expected based on source code) as well as ffmpeg logs, but ultimately no errors or warnings.

    However, then the generated output video.mp4, can only be played by ffplay, and VLC Player (as well as Google Chrome) fail to play the video.

    Playing it via vlc command line actually prints :

    [00007ffd3550fec0] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
    
TagLib: MP4: Invalid atom size
    
TagLib: MP4: Invalid atom size
    
TagLib: MP4: Invalid atom size

    Looking at ffprobe output, the bitrate and duration fields are empty :

    Input #0, h264, from 'video.mp4':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 352x288, 25 fps, 25 tbr, 1200k tbn, 50 tbc

    I am using ffmpeg 4.1 with the following configuration :

    ffprobe version 4.1 Copyright (c) 2007-2018 the FFmpeg developers
    
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-opencl --enable-videotoolbox
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100

    Any ideas how to fix this ? It is pretty surprising to see an API’s official example to be lacking such basic information.

  • ffmbc : QuickTime to XDCAMHD422 MXF

    13 novembre 2018, par Ze'ev

    Trying to create an XDCAMHD422 MXF with video from a QuickTime and audio from a stereo WAV.

    Audio is pcm_s24le, 48000 Hz, 2 channels, s32

    But output is mixed :

    Stream #0.1(und): Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s
    
Stream #0.2(und): Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s

    And shows alert : Incompatible sample format 's32' for codec 'pcm_s16le', auto-selecting format 's16'

    (For XDCAM, it’s necessary to split stereo into dual mono.)

    Command :

    ffmbc -i "$v" -i "$a" -tff -timecode 07:00:00:00 \
    
-map_audio_channel 1:0:0:0:1:0 \
    
-map_audio_channel 1:0:1:0:2:0 \
    
-acodec pcm_s24le -ar 48000 -ac 2 \
    
-target xdcamhd422 -vtag xd5c -y  -t 1 "$o" \
    
-acodec pcm_s24le -newaudio

    Output :

    FFmbc version 0.7.2
    
Copyright (c) 2008-2014 Baptiste Coudurier and the FFmpeg developers
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mov':
    
  Metadata:
    
    major_brand: qt
    
    minor_version: 537199360
    
    compatible_brands: qt
    
    timecode: 00:00:00:00
    
  Duration: 00:00:30.00, bitrate: 188317 kb/s
    
    Stream #0.0(eng): Video: prores, yuv422p10le, 1920x1080p, 186502 kb/s, PAR 1:1 DAR 16:9, 25.00 fps
    
    Metadata:
    
      codec_name: Apple ProRes 422 (HQ)
    
    Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
    
    Stream #0.2(eng): Data: unknown (tmcd)
    
Input #1, wav, from 'audio.wav':
    
  Metadata:
    
    encoded_by: Pro Tools
    
    originator_reference: aaOpK7OBThOk
    
    date: 2018-11-08
    
    creation_time: 14:10:50
    
    time_reference: 175680000
    
  Duration: 00:00:30.00, bitrate: 2316 kb/s
    
    Stream #1.0(und): Audio: pcm_s24le, 48000 Hz, 2 channels, s32, 2304 kb/s
    
[scale @ 0x7ff9f48009a0] w:1920 h:1080 fmt:yuv422p10le -> w:1920 h:1080 fmt:yuv422p flags:0x4 il:0
    
Incompatible sample format 's32' for codec 'pcm_s16le', auto-selecting format 's16'
    
Output #0, mxf, to 'mxftest3.mxf':
    
  Metadata:
    
    encoder: FFmbc 0.7
    
    Stream #0.0(und): Video: mpeg2video, yuv422p, 1920x1080i tff [PAR 1:1 DAR 16:9], cbr, 50000 kb/s, 25.00 fps
    
    Stream #0.1(und): Audio: pcm_s16le, 48000 Hz, 1 channels, s16, 768 kb/s
    
    Stream #0.2(und): Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
  Stream #1.0 -> #0.1 [channel: 0 -> 0]
    
  Stream #1.0 -> #0.2 [channel: 1 -> 0]
    
Press [q] to stop, [?] for help
    
frame=   25 fps=  8 q=2.0 Lsize=    7586kB time=00:00:01.00 bitrate=62145.0kbits/s
    
video:7309kB audio:236kB global headers:0kB muxing overhead 0.541060%

  • ffmpeg : "Referenced QT chapter track not found"

    29 avril 2019, par Ze'ev

    Using ffmpeg to replace audio in a QuickTime with audio from a WAV.

    Anyone know why I’m getting Referenced QT chapter track not found ?

    Command :

    $ ffmpeg \
    -i "$video" -t 25 \
    -i "$audio" -map 0:v -c:v copy -map 1:a -c:a pcm_s24le -ar 48000 \
    -hide_banner "$output"

    Output :

    [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7faf62010600] Referenced QT chapter track not found
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mov':
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    creation_time   : 2018-11-06T09:27:43.000000Z
    
  Duration: 00:00:25.00, start: 0.000000, bitrate: 186987 kb/s
    
    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 1920x1080, 185115 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-11-06T09:27:43.000000Z
    
      handler_name    : Apple Alias Data Handler
    
      encoder         : Apple ProRes 422 (HQ)
    
      timecode        : 00:00:00:00
    
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-11-06T09:27:43.000000Z
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-11-06T09:27:43.000000Z
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
Guessed Channel Layout for Input Stream #1.0 : stereo
    
Input #1, wav, from 'audio.wav':
    
  Metadata:
    
    encoded_by      : Pro Tools
    
    originator_reference: aaOpKJaTN7Nk
    
    date            : 2018-11-08
    
    creation_time   : 13:53:50
    
    time_reference  : 166698000
    
  Duration: 00:00:25.00, bitrate: 2128 kb/s
    
    Stream #1:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s32 (24 bit), 2116 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #1:0 -> #0:1 (pcm_s24le (native) -> pcm_s24le (native))
    
Press [q] to stop, [?] for help
    
Output #0, mov, to 'test19.mov':
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    encoder         : Lavf58.12.100
    
    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 185115 kb/s, 0.04 fps, 25 tbr, 12800 tbn, 25 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-11-06T09:27:43.000000Z
    
      handler_name    : Apple Alias Data Handler
    
      encoder         : Apple ProRes 422 (HQ)
    
      timecode        : 00:00:00:00
    
    Stream #0:1: Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
    
    Metadata:
    
      encoder         : Lavc58.18.100 pcm_s24le
    
frame=  625 fps=277 q=-1.0 Lsize=  566343kB time=00:00:24.96 bitrate=185876.0kbits/s speed=11.1x
    
video:564928kB audio:1406kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001496%

    Same error with -map 0:v:0

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