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• How do you specify encoding parameters for ffmpeg ? [duplicate]

  2 janvier 2021, par Halim Amran

  I wanted to concatenate 3 clips together with demuxer. the clips add up to about 27 secs but the output file is about 24 min long. the first clip runs normally but as soon as the second starts it just sorta freezes (it runs on an extremely low frame rate). the 3rd one just runs extremely fast for some reason.

  


  files.txt :

  


  file './tmp/clip_0_0.mp4' 
file './tmp/clip_0_1.mp4' 
file './tmp/clip_0_2.mp4' 


  


  this is the command I'm using

  


  ffmpeg -f concat -safe 0 -i files.txt -c copy -an ./ready/clip_0r.mp4

  


  files

  


  per request of llogan ; showing the output of ffmpeg -i ./tmp/clip_0_0.mp4 -i ./tmp/clip_0_1.mp4 -i ./tmp/clip_0_2.mp4

  


  ffmpeg version 2021-01-01-git-63505fc60a-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 62.100 / 56. 62.100
  libavcodec     58.115.102 / 58.115.102
  libavformat    58. 65.100 / 58. 65.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter     7. 94.100 /  7. 94.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './tmp/clip_0_0.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
  Duration: 00:00:10.42, start: 0.000000, bitrate: 5670 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/smpte170m/unknown), 1920x1080, 5670 kb/s, 59.99 fps, 60 tbr, 15360 tbn, 2k tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from './tmp/clip_0_1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.31.102
  Duration: 00:00:10.36, start: 0.000000, bitrate: 1256 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], 1249 kb/s, 60.03 fps, 60.03 tbr, 805837.00 tbn, 120.07 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from './tmp/clip_0_2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.65.100
  Duration: 00:00:06.83, start: 0.094987, bitrate: 5680 kb/s
    Stream #2:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/smpte170m/unknown), 1920x1080, 5672 kb/s, 60.01 fps, 60 tbr, 15360 tbn, 2k tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
At least one output file must be specified


  


  Edit : the problems seems like that clip_0_1 is encoded with different codec parameters. But clip_0_1 is encoded with ffmpeg using image2pipe from a stream of images so the question becomes go do you force clip_0_1 to be encoded the same way as clip_0_0 and clip_0_2 ?

  


• Hardware accelerated mjpeg encoding with ffmpeg

  10 avril 2021, par quarks

  I have this batch file that I need to convert videos into MJPEG but using Hardware acceleration on a machine with AMD GPU (Vega 8 and RX560X specifically)

  


  echo off
set arg1=%1
shift
ffmpeg -i %arg1% -vcodec mjpeg_vaapi -vf scale=min'(960,iw)':-1 -acodec pcm_s16le -ar 22050 -ac 2 -r 20 -q:v 5s -f avi %arg1%.mojo


  


  And I'm using ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers

  


  Running the batch throws Unknown encoder 'mjpeg_vaapi'

  


  Which ffmpeg version contains the MJPEG encoder that can encode with hardware acceleration ?

  


• ffmpeg issue after adding background audio

  9 avril 2021, par spicy

  So I have an issue to which I cannot find an answer. I have a video which is 7min 38sec long after concat. When I want to add background audio to this video it cuts off the last 7sec of the original video. I cannot find the reason.

  


  If anyone could help me in any way, it would be amazing because I have been troubleshooting this past 3 days.

  


  My FFmpeg version is ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers.

  


  For concat I use this : FFmpeg -f concat -safe 0 -i txtfile.txt -c copy -ac 2 output.mp4

  


  For adding background audio I use this : ffmpeg -i output.mp4 -i background.mp3 -c:v copy -filter_complex "[0:a]aformat=fltp:44100:stereo,apad[0a];[1]aformat=fltp:44100:stereo,volume=0.2[1a];[0a][1a]amerge[a]" -map 0:v -map "[a]" -ac 2 -shortest output_with_background.mp4

  


  And the console output while doing its stuff is :

  


  ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  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
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000024baee72440] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'C:\Users\shooey\Desktop\junky\Content\07-04-2021\videos.txt':
  Duration: N/A, start: -0.023220, bitrate: 18916 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 18861 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 54 kb/s
    Metadata:
      handler_name    : SoundHandler
File 'C:\Users\shooey\Desktop\junky\Content\07-04-2021\output.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'C:\Users\shooey\Desktop\junky\Content\07-04-2021\output.mp4':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 18861 kb/s, 30 fps, 30 tbr, 15360 tbn, 15360 tbc
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 54 kb/s
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000024baee72440] Auto-inserting h264_mp4toannexb bitstream filter
    Last message repeated 5 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000024baeeec180] Auto-inserting h264_mp4toannexb bitstream filter
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000024baee72440] Auto-inserting h264_mp4toannexb bitstream filter
    Last message repeated 14 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000024baee72440] Auto-inserting h264_mp4toannexb bitstream filter
    Last message repeated 20 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000024baee72440] Auto-inserting h264_mp4toannexb bitstream filter
    Last message repeated 7 times
frame=   52 fps= 42 q=-1.0 Lsize=    7838kB time=00:07:38.82 bitrate= 139.9kbits/s speed= 374x
video:4802kB audio:2956kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.044608%
ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  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
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\shooey\Desktop\junky\Content\07-04-2021\output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:07:38.85, start: 0.000000, bitrate: 139 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 87 kb/s, 0.12 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 52 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mp3, from 'C:\Users\shooey\Desktop\junky\Content\assets\background.mp3':
  Metadata:
    major_brand     : dash
    Software        : Lavf57.56.101
    minor_version   : 0
    compatible_brands: iso6mp41
  Duration: 00:20:03.02, start: 0.025057, bitrate: 167 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 167 kb/s
    Metadata:
      encoder         : LAME3.100
File 'C:\Users\shooey\Desktop\junky\Content\07-04-2021\output_bckg.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:1 (aac) -> aformat
  Stream #1:0 (mp3float) -> aformat
  Stream #0:0 -> #0:0 (copy)
  amerge -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[Parsed_amerge_4 @ 0000017093965c80] No channel layout for input 1
[Parsed_amerge_4 @ 0000017093965c80] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
Output #0, mp4, to 'C:\Users\shooey\Desktop\junky\Content\07-04-2021\output_bckg.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 87 kb/s, 0.12 fps, 30 tbr, 15360 tbn, 15360 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.54.100 aac
frame=   52 fps=5.5 q=-1.0 Lsize=   11993kB time=00:07:31.67 bitrate= 217.5kbits/s speed=  48x
video:4802kB audio:7111kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.670061%
[aac @ 00000170935b4980] Qavg: 319.394