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• FFMPEG recode clip1 to match clip2 for concat demux

  21 novembre 2020, par Gert Gottschalk

  I want to concat two video clips using ffmpeg concat. To use concat demuxer both should have same codec settings. clip2 is much shorter so I want to recode it to match clip1. Initially clip2 had tbn not matching and I adjusted that with '-video_track_timescale 50000'. Still the concat video after the cut into clip2 is garbled (audio seems OK)

  


  This is what ffprobe tells for clip1 :

  


  ffprobe version N-80251-g0c7fa15 Copyright (c) 2007-2016 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --prefix=/home/tools/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/tools/ffmpeg_build/include --extra-ldflags=-L/home/tools/ffmpeg_build/lib --bindir=/home/tools/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  libavutil      55. 24.100 / 55. 24.100
  libavcodec     57. 45.100 / 57. 45.100
  libavformat    57. 37.101 / 57. 37.101
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 46.101 /  6. 46.101
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1
    creation_time   : 2020-11-09 01:16:52
  Duration: 01:23:09.33, start: 0.000000, bitrate: 2279 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2080 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    Metadata:
      creation_time   : 2020-11-09 01:16:52
      handler_name    : 11.07_21-45_ard_90_TVOON_DE.mpg.HD_video.h264@GPAC0.5.2-DEV-revVersion: 0.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.1
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
    Metadata:
      creation_time   : 2020-11-09 01:17:45
      handler_name    : 11.07_21-45_ard_90_TVOON_DE.mpg.HD.aac@GPAC0.5.2-DEV-revVersion: 0.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.1


  


  From clip2

  


  ffprobe version N-80251-g0c7fa15 Copyright (c) 2007-2016 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --prefix=/home/tools/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/tools/ffmpeg_build/include --extra-ldflags=-L/home/tools/ffmpeg_build/lib --bindir=/home/tools/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  libavutil      55. 24.100 / 55. 24.100
  libavcodec     57. 45.100 / 57. 45.100
  libavformat    57. 37.101 / 57. 37.101
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 46.101 /  6. 46.101
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.37.101
    comment         :  
  Duration: 00:18:42.02, start: 0.000000, bitrate: 1693 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1553 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 130 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  


  Then for concat :

  


  /home/tools/bin/ffmpeg -f concat -i list.files  -y clip12.mp4


  


  The only gap is with
clip1 : 2080 kb/s
clip2 : 1553 kb/s

  


  Is that significant ?

  


  If yes, how to recode clip2 to match and result in concat clip12 being clean ?

  


  EDIT (Per feedback from llogan) :

  


  Probing input clips with latest ffprobe.

  


  Clip1 :

  


  ffprobe version N-54874-ga1553b0cfb-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 60.100 / 56. 60.100
  libavcodec     58.112.101 / 58.112.101
  libavformat    58. 64.100 / 58. 64.100
  libavdevice    58. 11.102 / 58. 11.102
  libavfilter     7. 88.102 /  7. 88.102
  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 'clip1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1
    creation_time   : 2020-11-09T01:16:52.000000Z
  Duration: 01:23:09.33, start: 0.000000, bitrate: 2279 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2080 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    Metadata:
      creation_time   : 2020-11-09T01:16:52.000000Z
      handler_name    : 11.07_21-45_ard_90_TVOON_DE.mpg.HD_video.h264@GPAC0.5.2-DEV-revVersion: 0.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.1
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
    Metadata:
      creation_time   : 2020-11-09T01:17:45.000000Z
      handler_name    : 11.07_21-45_ard_90_TVOON_DE.mpg.HD.aac@GPAC0.5.2-DEV-revVersion: 0.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.1


  


  Command & log to change clip2 :

  


  /usr/share/ffmpeg.4.3.1//ffmpeg-git-20201104-amd64-static/ffmpeg -i clip2.avi -ss 00:12:55  -t 00:05:48 -c:v libx264 -profile:v main -video_track_timescale 50k -c:a copy -y clip2.mp4 2> ffmpeg_clip2.log
ffmpeg version N-54874-ga1553b0cfb-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 60.100 / 56. 60.100
  libavcodec     58.112.101 / 58.112.101
  libavformat    58. 64.100 / 58. 64.100
  libavdevice    58. 11.102 / 58. 11.102
  libavfilter     7. 88.102 /  7. 88.102
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, avi, from 'clip2.avi':
  Metadata:
    comment         :  
    encoder         : Lavf58.42.100
    encoded_by      : www.onlinetvrecorder.com
  Duration: 00:35:48.90, start: 0.000000, bitrate: 2243 kb/s
    Stream #0:0: Video: h264 (Main) (H264 / 0x34363248), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 2034 kb/s, 50 fps, 50 tbr, 50 tbn, 100 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 192 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A  
...
frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A
[libx264 @ 0x71fb740] using SAR=1/1
[libx264 @ 0x71fb740] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3
[libx264 @ 0x71fb740] profile Main, level 3.2, 4:2:0, 8-bit
[libx264 @ 0x71fb740] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'clip2.mp4':
  Metadata:
    comment         :  
    encoded_by      : www.onlinetvrecorder.com
    encoder         : Lavf58.64.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 50 fps, 50k tbn, 50 tbc
    Metadata:
      encoder         : Lavc58.112.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s
frame=   15 fps=0.4 q=0.0 size=       0kB time=00:00:00.31 bitrate=   1.2kbits/s speed=0.00806x    
...
frame=17400 fps= 73 q=-1.0 Lsize=   62382kB time=00:05:47.97 bitrate=1468.6kbits/s speed=1.47x    
video:53846kB audio:8156kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.611439%
[libx264 @ 0x71fb740] frame I:157   Avg QP:18.21  size: 42082
[libx264 @ 0x71fb740] frame P:5607  Avg QP:22.21  size:  6677
[libx264 @ 0x71fb740] frame B:11636 Avg QP:23.93  size:   953
[libx264 @ 0x71fb740] consecutive B-frames:  8.3%  6.0%  5.0% 80.8%
[libx264 @ 0x71fb740] mb I  I16..4: 47.5%  0.0% 52.5%
[libx264 @ 0x71fb740] mb P  I16..4:  5.7%  0.0%  1.1%  P16..4: 35.4%  6.2%  3.0%  0.0%  0.0%    skip:48.4%
[libx264 @ 0x71fb740] mb B  I16..4:  0.2%  0.0%  0.0%  B16..8: 21.0%  0.4%  0.0%  direct: 0.5%  skip:77.9%  L0:45.1% L1:53.8% BI: 1.2%
[libx264 @ 0x71fb740] coded y,uvDC,uvAC intra: 24.6% 38.3% 6.0% inter: 2.8% 4.7% 0.0%
[libx264 @ 0x71fb740] i16 v,h,dc,p: 43% 24% 15% 18%
[libx264 @ 0x71fb740] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 20% 19%  6%  7%  6%  6%  6%  4%
[libx264 @ 0x71fb740] i8c dc,h,v,p: 57% 20% 20%  4%
[libx264 @ 0x71fb740] Weighted P-Frames: Y:0.5% UV:0.4%
[libx264 @ 0x71fb740] ref P L0: 70.3% 12.1% 14.0%  3.6%  0.0%
[libx264 @ 0x71fb740] ref B L0: 92.9%  5.9%  1.2%
[libx264 @ 0x71fb740] ref B L1: 97.5%  2.5%
[libx264 @ 0x71fb740] kb/s:1267.54


  


  I'm observing mismatch in what I assume is the audio channel.

  


  Clip1 :

  


  /usr/share/ffmpeg.4.3.1//ffmpeg-git-20201104-amd64-static/ffprobe  clip1.mp4
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2080 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)


  


  Clip2 :

  


  /usr/share/ffmpeg.4.3.1//ffmpeg-git-20201104-amd64-static/ffprobe  clip2.mp4 
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1267 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)


  


  Probably need to match audio channel. I noticed that the concat too a long time. I was expecting the concat to just do copying and not re-rendering.

  


• How can I send a virtual camera to Genymotion or Android Studio Emulator in Ubuntu ?

  4 décembre 2020, par ykasur

  I created a virtual camera using v4l2loopback and ffmpeg. The command I use for ffmpeg is :
ffmpeg -re -l oop 1 -i vin.png -vf format=yuv420p -f v4l2 /dev/video2

  


  vin.png is the image I want to stream to the webcam and /dev/video2 is the virtual webcam I created with v4l2loopback.
The virtual webcam works and I can see it e.g. with onlinemicetest.com/webcam-test.
I'm using the Genymotion emulator with the newest Android API (I tried 7.0, 8.1 and 10.0) on Ubuntu 20.40.
Genymotion detects the virtual camera but only displays a dummy image :
Wrong dummy Image from Genymotion
I also tried (and would prefer to use) the android studio emulator. But I can only select Webcam0 in the configuration of the device camera and that points to the real integrated camera and not to my virtual webcam.

  


  I don't need to use ffmpeg, but I do need to use a tool that lets me control which image to stream from the command line.

  


  Is there a way to solve this ? Many thanks in advance !

  


  Update 17.11.2020 :
The Genymotion support answered me, that they plan to support virtual cameras in the future. They might be ready to add this in mid 2021.

  


• ffmpeg sRGB jpgs to rec709 mov

  9 mars 2021, par maxdownunder

  I'm trying to convert an sRGB jpeg sequence into a rec709 DnX Quicktime... but struggle to get the colormatrix right.

  


  ffmpeg -y -f image2 -start_number 1 -framerate 24 -i input.%04d.jpg -c:v dnxhd -vf "scale=1920:1080,fps=24,format=yuv422p10,colorspace=all=bt709:itrc=srgb" -b:v 175M -c:a pcm_s16le output.mov


  


  My understanding is this should set everything to rec709, but override the input response curve (itrc=srgb), but this fails with

  


  Unsupported input primaries 2 (unknown)
Error while filtering: Invalid argument
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0


  


  I haven't been able to come up with any combination of flags that doesn't trough an error and produces the right colors.

  


  Some docs here : ffmpeg filters trc

  


  Any help much appreciated !

  


  Edit :
Full log :

  


  $ ffmpeg -y -f image2 -start_number 1 -framerate 24 -i input.%04d.jpg -c:v dnxhd -vf "scale=1920:1080,fps=24,format=yuv422p10,colorspace=all=bt709:itrc=srgb" -b:v 175M -c:a pcm_s16le output.mov
ffmpeg version 4.3.1-2020-11-08-essentials_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev3, 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-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --en
able-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --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-li
bmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'input.%04d.jpg':
  Duration: 00:00:00.13, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1200:1200 DAR 16:9], 24 fps, 24 tbr, 24 tbn, 24 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> dnxhd (native))
Press [q] to stop, [?] for help
[swscaler @ 0000026ac0f81600] deprecated pixel format used, make sure you did set range correctly
Output #0, mov, to 'output.mov':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: dnxhd (DNXHD) (AVdn / 0x6E645641), yuv422p10le, 1920x1080 [SAR 1:1 DAR 16:9], q=2-1024, 175000 kb/s, 24 fps, 12288 tbn, 24 tbc
    Metadata:
      encoder         : Lavc58.91.100 dnxhd
[Parsed_colorspace_3 @ 0000026ac0f7e080] Unsupported input primaries 2 (unknown)
Error while filtering: Invalid argument
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!