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• How to remove everything but video and stereo audio stream from video with ffmpeg ?

  20 octobre 2019, par user3776738

  I’m trying to get a clean h264 video from a mkv file.With clean I mean that it has only a video stream plus stereo sound.
  The inputfile can have multiple channels and subtitles and other unknown stuff, which I don’t need.
  I’m using ffmpeg with this command :

   ffmpeg -i "input.mkv" -ac 2 -vf scale=trunc(oh*a/2)*2:480 -c:v libx264 "output.mp4"

  This should give me a 480p video with stereo sound,which I require.
  I tried multiple -map or dispositions commands with ffmpeg to remove the subtitles whithout any success.

  How can I remove everything but video and stereo stream with ffmpeg and get a 480p stereo sound video ?

  Edit :
  Output of ffmpeg - "input.mkv" -i "output.mp4" :

  ffmpeg -i "input.mkv" -i "output.mp4"
  
  ffmpeg version N-91972-gbd10c1e9a8 Copyright (c) 2000-2018 the FFmpeg developer
  
  
  
    built with gcc 8.2.1 (GCC) 20180813
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconf
  
  g --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-li
  
  freetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-am
  
  wb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy -
  
  enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-
  
  ibwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 -
  
  enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --e
  
  able-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --e
  
  able-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --
  
  nable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --ena
  
  le-avisynth
  
    libavutil      56. 19.101 / 56. 19.101
  
    libavcodec     58. 30.100 / 58. 30.100
  
    libavformat    58. 18.101 / 58. 18.101
  
    libavdevice    58.  4.103 / 58.  4.103
  
    libavfilter     7. 32.100 /  7. 32.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  [hevc @ 00000000004a5940] Invalid default display window
  
  Input #0, matroska,webm, from 'input.mkv':
  
    Metadata:
  
      title           : Elysium (2013)
  
      encoder         : libebml v1.3.3 + libmatroska v1.4.4
  
      creation_time   : 2016-01-05T22:30:41.000000Z
  
    Duration: 00:01:02.73, start: 0.166000, bitrate: 53638 kb/s
  
      Chapter #0:0: start 0.000000, end 62.896000
  
      Metadata:
  
        title           : 00:00:00.000
  
      Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv), 3840x1606, SAR 1:
  
   DAR 1920:803, 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
  
      Metadata:
  
        title           : Elysium (2013) - Release for ULTRAHDCLUB
  
        BPS             : 51036975
  
        BPS-eng         : 51036975
  
        DURATION        : 00:01:02.604000000
  
        DURATION-eng    : 00:01:02.604000000
  
        NUMBER_OF_FRAMES: 1501
  
        NUMBER_OF_FRAMES-eng: 1501
  
        NUMBER_OF_BYTES : 399389852
  
        NUMBER_OF_BYTES-eng: 399389852
  
        _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_DATE_UTC: 2016-01-05 22:30:41
  
        _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-05 22:30:41
  
        _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
      Stream #0:1(eng): Audio: dts (DTS-HD MA), 48000 Hz, 7.1, s16p (default)
  
      Metadata:
  
        title           : DTS-HD MA 7.1 - Blu-ray CEE
  
        BPS             : 2706639
  
        BPS-eng         : 2706639
  
        DURATION        : 00:01:02.561000000
  
        DURATION-eng    : 00:01:02.561000000
  
        NUMBER_OF_FRAMES: 5865
  
        NUMBER_OF_FRAMES-eng: 5865
  
        NUMBER_OF_BYTES : 21166260
  
        NUMBER_OF_BYTES-eng: 21166260
  
        _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
  
        _STATISTICS_WRITING_DATE_UTC: 2016-01-05 22:30:41
  
        _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-05 22:30:41
  
        _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
        _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Elysium (2013)
  
      encoder         : Lavf58.18.101
  
    Duration: 00:01:02.73, start: 0.000000, bitrate: 1671 kb/s
  
      Chapter #1:0: start 0.000000, end 62.730000
  
      Metadata:
  
        title           : 00:00:00.000
  
      Stream #1:0(eng): Video: h264 (High 10) (avc1 / 0x31637661), yuv420p10le, 1
  
  46x480 [SAR 2030:2027 DAR 38773:16216], 1543 kb/s, SAR 15563:15540 DAR 1920:803
  
   23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fl
  
  p, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #1:2(eng): Data: bin_data (text / 0x74786574), 0 kb/s
  
      Metadata:
  
        handler_name    : SubtitleHandler
  
  At least one output file must be specified

• 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
  

• 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.