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• avformat/movenc : added ability to use original stream ids as track ids instead of...

  31 août 2016, par Erkki Seppälä

  avformat/movenc : added ability to use original stream ids as track ids instead of regenerating them
  Sometimes it’s useful to be able to define the exact track numbers in
  
  the generated track, instead of always beginning at track id 1. Using
  
  the option use_stream_ids_as_track_ids now copies the use stream ids
  
  to track ids. Dynamically generated tracks (ie. tmcd) have their track
  
  numbers defined as continuing from the highest numbered stream id.
  Signed-off-by : Erkki Seppälä <erkki.seppala.ext@nokia.com>
  
  Signed-off-by : OZOPlayer <OZOPL@nokia.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/movenc.c
  • [DH] libavformat/movenc.h

• How do I maintain the original bitrate during conversion ?

  15 septembre 2016, par user3753682

  I have to generate multiple bitrate videos from a single source file. I am using the following command.

  ffmpeg -i $1 -c:v libx264 -r 25\
  
      -pix_fmt yuv420p -x264opts keyint=125:min-keyint=125:no-scenecut:pass=1 -b:v 2500k -maxrate 5000k -bufsize 10000k -movflags +faststart -preset ultrafast -strict -2 -acodec aac -y resolution_480p.mp4 \
  
      -pix_fmt yuv420p -x264opts keyint=125:min-keyint=125:no-scenecut:pass=1 -b:v 1000k -maxrate 2000k -bufsize 4000k -movflags +faststart -preset ultrafast -strict -2 -acodec aac -y resolution_360p.mp4 \
  
      -pix_fmt yuv420p -x264opts keyint=125:min-keyint=125:no-scenecut:pass=1 -b:v 5000k -maxrate 10000k -bufsize 20000k -movflags +faststart -preset ultrafast -strict -2 -acodec aac -y resolution_720p.mp4

  My problem here is that the input source file may be in any quality. How do I instruct the conversion to maintain the original bitrate, if the source file bitrate is less than the bitrate to which it has to be converted ?

• How to segment a video and then concatenate back into original one with ffmpeg

  23 décembre 2016, par steve

  I am surveying on distributed video transcoding with FFmpeg. I have found that there is a good script on https://github.com/nergdron/dve/blob/master/dve.

  The script mainly uses the segment and concatenate filters of FFmpeg. I want to do a simple test first. However, I can not split the video into segments and then concatenate back to original video (with the same codec). I have tried with the following command :

  a. Chunk the video

  ffmpeg -fflags +genpts -i Test.avi -map 0 -codec copy -f segment -segment_format avi -v error chunk-%03d.seg

  b. Building the chunking list :

  #!/bin/bash -e
  
  set -e
  
  echo "ffconcat version 1.0" > concat.txt
  
  for f in `ls chunk-*.seg | sort`; do
  
  echo "file $f" >> concat.txt
  
  done

  c. Concatenate the chunks

  ffmpeg  -y -v error -i concat.txt -f concat -map 0 -c copy -f avi output.avi

  Then when I run ffprobe I get the following message which says it is a non-interleaved AVI :

      ffprobe version N-82301-g1bbb18f Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 35.100 / 55. 35.100
  
    libavcodec     57. 66.101 / 57. 66.101
  
    libavformat    57. 57.100 / 57. 57.100
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 66.100 /  6. 66.100
  
    libswscale      4.  3.100 /  4.  3.100
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  [avi @ 00000000028e3700] non-interleaved AVI
  
  Input #0, avi, from 'output.avi':
  
    Metadata:
  
      encoder         : Lavf57.57.100
  
    Duration: 74:43:47.82, start: 0.000000, bitrate: 17 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x368 [SAR 1:1 DAR 40:23], 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 112 kb/s

  I have tried a few other things without success. Any help would be greatly appreciated. Thanks in advance !!