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• How to create m3u8 playlist and mpeg-ts chunks with constant duration by using FFMPEG ?

  15 octobre 2015, par Alexandr

  I have mp4 file (Big Buck Bunny) :
  Duration : 00:09:56.50
  Bitrate : 2048 kb/s
  Size : 1280x720
  fps : 29.97
  I’ve set constant keyframes after 2 second.
  I want to prepare this video for HLS.
  I use this for generate m3u8 playlist and generate ts chunks :

  ffmpeg -i input.mp4 -hls_time 2 out.m3u8

  But unfortunately I don’t understand how it works.
  I’ve thought this command generates 298 chunks of 2 seconds but it generates only 152 chunks with different lengths (3 - 9 seconds).
  But the most strange thing it have created m3u8 file with only 5 links to files.

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:9
  
  #EXT-X-MEDIA-SEQUENCE:148
  
  #EXTINF:8.341667,
  
  out148.ts
  
  #EXTINF:7.841167,
  
  out149.ts
  
  #EXTINF:0.967633,
  
  out150.ts
  
  #EXTINF:8.341667,
  
  out151.ts
  
  #EXTINF:7.140467,
  
  out152.ts
  
  #EXT-X-ENDLIST

  I’ve thought m3u8 file have to includes all part of videos. Can somebody explain me how to create 298 chunks each of 2 seconds and fill m3u8 file properly ?

• FFmpeg - Requested output format 'mpeg' is not a suitable output format

  14 mai 2015, par Jon G

  I am trying to use FFmpeg to convert a video from mp4 format to an mpeg, so that I can merge multiple videos. I have a custom build of FFmpeg where I control the configuration options :

  ffmpeg -y -i VID_20150514_171122_12085.mp4 -an -f mpeg VID_20150514_184208.mp4.0.mpg
  
  ffmpeg version git-2015-02-25-b0d3322 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (GCC)
  
    configuration: --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --enable-pic --disable-shared --enable-static --cross-prefix=/home/jon/Development/android-ndk-r10d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --enable-cross-compile --sysroot=/home/jon/Development/android-ndk-r10d/platforms/android-9/arch-arm/ --extra-cflags='-I../x264 -mfloat-abi=softfp -mfpu=neon -fPIE -pie' --extra-ldflags='-L../x264 -fPIE -pie' --enable-version3 --enable-gpl --disable-doc --enable-yasm --disable-everything --enable-decoder=mpeg --enable-decoder=mpeg4 --enable-decoder=aac --enable-decoder=h264 --enable-decoder=libx264 --enable-encoder=libx264 --enable-decoder=mpegvideo --enable-decoder=mpeg1video --enable-decoder=mpeg2video --enable-encoder=mpeg --enable-encoder=mpeg4 --enable-encoder=aac --enable-encoder=h264 --enable-encoder=mpeg1video --enable-encoder=mpeg2video --enable-parser=aac --enable-parser=mpeg4video --enable-parser=ac3 --enable-parser=h261 --enable-parser=h264 --enable-parser=vc1 --enable-demuxer=mpegvideo --enable-demuxer=aac --enable-demuxer=m4v --enable-demuxer=mov --enable-demuxer=h264 --enable-demuxer=vc1 --enable-muxer=h264 --enable-muxer=mpeg2video --enable-muxer=mp4 --enable-muxer=mov --enable-protocols --enable-indev=v4l --enable-indev=v4l2 --enable-filter=aresample --enable-filter=scale --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-symver --enable-network --enable-libx264 --enable-zlib --enable-muxer=md5
  
    libavutil      54. 19.100 / 54. 19.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 23.105 / 56. 23.105
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.101 /  5. 11.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_20150514_171122_12085.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.23.105
  
    Duration: 00:00:09.79, start: 0.773229, bitrate: 2013 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2005 kb/s, 30.35 fps, 30.35 tbr, 18k tbn, 60.71 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 155 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [NULL @ 0xb7520490] Requested output format 'mpeg' is not a suitable output format
  
  VID_20150514_184208.mp4.0.mpg: Invalid argument

  But I keep getting an error saying "Requested output format ’mpeg’ is not a suitable output format". The same command seems to work on my Ubuntu machine with a full build of FFmpeg. What am I missing ? I thought I had all the mpeg encoders/decoders enabled ... mpeg, mpegvideo, mpeg1video, mpeg2video.

• mp4 video written with ffmpeg has different first frame based on total number of frames

  26 janvier 2023, par Nitzan Weissman

  I'm trying to read and write videos using ffmpeg, and I got an interesting phenomenon where the first frame is not the same in videos I create that are made from the same frames, only with different lengths.

  


  The commands I'm running to reproduce the problem :

  


  ffmpeg -i .mp4 -frames:v 20 -q:v 3 resource_images/00%04d.png

ffmpeg -hide_banner -loglevel error -framerate 30 -y -i resource_images/00%04d.png  -c:v libx264 -pix_fmt yuv420p -frames:v 20 long_video.mp4 -y

ffmpeg -hide_banner -loglevel error -framerate 30 -y -i resource_images/00%04d.png  -c:v libx264 -pix_fmt yuv420p -frames:v 10 short_video.mp4 -y

ffmpeg -i long_video.mp4 -vf "select=eq(n,0)" -q:v 3 long_frame0.png -y

ffmpeg -i short_video.mp4 -vf "select=eq(n,0)" -q:v 3 short_frame0.png -y


  


  The images long_frame0.png and short_frame0.png are different (I loaded them using Python and compared them, there are many differences).

  


  I find it very peculiar, since I create very short videos, it's those videos first frames, and they are keyframes of those videos (I checked it using ffprobe)

  


  What is the cause of this issue and how do I overcome it to create a consistent first frame for a video, regardless of the video length ?