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• 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%

• 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.

• ffmpeg get orientation inverted

  16 novembre 2018, par Faabass

  I getting the resolution for a video, but ffmpeg/ffprobe is getting inverted.. Always the biggest number is the width.

  I mean, it doesn’t matter if I’m getting the resolution of a vertical or horizontal video, I’m always getting for example 640x480 when it should be 480x640. Also I tried with the aspect ratio as 4:3 instead of 3:4

  ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=p=0 original.mp4

  So my question is how I can get the right resolution or at least the orientation I need to know if the video is horizontal or vertical.

  See full response :

  ffprobe -select_streams v:0 -show_entries stream=width,height -of csv=p=0 original.mp4
  
  ffprobe version N-86781-gd8f1982639-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2007-2017 the FFmpeg developers
  
    built with gcc 5.4.1 (Debian 5.4.1-11) 20170519
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  
    libavutil      55. 67.100 / 55. 67.100
  
    libavcodec     57.100.104 / 57.100.104
  
    libavformat    57. 75.100 / 57. 75.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 95.100 /  6. 95.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x4ff7e60] sample aspect ratio already set to 1:1, ignoring 'pasp' atom (65536:65536)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2018-11-12T22:15:04.000000Z
  
      com.android.version: 7.0
  
    Duration: 00:01:10.30, start: 0.000000, bitrate: 9497 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/smpte170m), 1280x720, 9365 kb/s, SAR 1:1 DAR 16:9, 23.97 fps, 24 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        rotate          : 270
  
        creation_time   : 2018-11-12T22:15:04.000000Z
  
        handler_name    : VideoHandle
  
      Side data:
  
        displaymatrix: rotation of 90.00 degrees
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-11-12T22:15:04.000000Z
  
        handler_name    : SoundHandle
  
  1280,720

  but this is the appearance of the video