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  • 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
    enter image description here

  • 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

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