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• FFMPEG recombine a video with its original uncropped version

  9 décembre 2022, par Skyler

  I have a video which I cropped to run through a script to process these files much quicker. I would like to now combine the cropped videos back in with their original uncropped version, using the audio from one of the files (the cropped one in this case). The script to crop was :

  


  ffmpeg -i file.mp4 -filter:v "crop=1000:1000:580:0" -crf 20 -preset slow smaller.mp4


  


  So how do I remerge them ?

  


• webm live input to HLS live output

  15 avril 2021, par Lewis Tyler

  I have ben struggling with this for quite some time ; Essentially what I'm trying to do is broadcast my webcam from within the Browser to Ffmpeg on the server to convert into a .m3u8 HLS live stream. But I am having a few problems with video playback I initially thought it was CORS and cross origin headers however now I am thinking its to do with the way I'm trying to encode the media.

  


  I did a ffprobe on the input this was the response ;

  


  SERVER:key destination set to:1618380585-6666-863686008-4444-21
FFMPEG:Input #0, matroska,webm, from 'pipe:':
  Metadata:
    encoder         : Chrome
  Duration: 
FFMPEG:N/A, start: 0.000000, bitrate: N/A
    Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
    Stream #0:1(eng): Video: h264 (Constrained Baseline), yuv420p, 640x480, SAR 1:1 DAR 4:3, 30.30 fps, 30 tbr, 1k tbn, 60 tbc (default)


  


  I am wondering if someone could help with the ffmpeg parameters ; I am currently using the following ;

  


      var ops=[
        '-r', '17',
        '-i','-',
        '-strict', '-2',
        '-vf', 'scale=w=1280:h=720:force_original_aspect_ratio=decrease',
        '-c:a', 'aac',
        '-ar', '48000',
        '-b:a', '128k',
        '-c:v', 'h264',
        '-profile:v', 'main',
        '-crf', '20',
        '-g', '48',
        '-keyint_min', '48',
        '-sc_threshold', '0',
        '-hls_time', '4',       
        '-hls_segment_filename', '/var/www/html/streams/segments/streamKey-date-%02d.ts',
        '-hls_base_url', '/streams/segments/',
        '/var/www/html/streams/streamKey.m3u8'
    ];


  


  I have also run into other problems and I was also wondering if i needed to build ffmpeg differently ; here is the current build I am running ; I only wonder this becuase when i try to add the -hls_playlist_type live parameter I get a response of not found.

  


  ffmpeg version 2.8.17-0ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...


  


  EDIT

  


  I have also included an example .m3u8

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:5.647056,
/streams/segments/1618380585-6666-863686008-4444-21-668-00.ts
#EXTINF:2.823533,
/streams/segments/1618380585-6666-863686008-4444-21-668-01.ts
#EXTINF:5.647056,
/streams/segments/1618380585-6666-863686008-4444-21-668-02.ts
#EXTINF:0.294122,
/streams/segments/1618380585-6666-863686008-4444-21-668-03.ts
#EXT-X-ENDLIST


  


• doc/formats : add reference to ffmpeg(1) stream specifiers as that docs is more complete

  16 février 2019, par Marton Balint

  doc/formats : add reference to ffmpeg(1) stream specifiers as that docs is more complete
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/formats.texi