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• lavf : Add an MPEG-DASH ISOFF segmenting muxer

  6 octobre 2014, par Martin Storsjö

  lavf : Add an MPEG-DASH ISOFF segmenting muxer
  This is mostly to serve as a reference example on how to segment
  
  the output from the mp4 muxer, capable of writing the segment
  
  list in four different ways :
  
   SegmentTemplate with SegmentTimeline
  
   SegmentTemplate with implicit segments
  
   SegmentList with individual files
  
   SegmentList with one single file per track, and byte ranges
  The muxer is able to serve live content (with optional windowing)
  
  or create a static segmented MPD.
  In advanced cases, users will probably want to do the segmenting
  
  in their own application code.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] Changelog
  • [DH] configure
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/dashenc.c
  • [DH] libavformat/version.h

• Segment duration variation is higher than the +/- 50% allowed by DASH-IF

  23 mars 2016, par timhysniu

  I am implement a proof of concept page with video player that uses DASH. I am having a difficult time getting the video right and I am not sure whether this is an encoding issue or MP4Box issue.

  Since I am working on Ubuntu I had to change a few parameters for ffmpeg, but according to what I read this should be fine :

  ~/ffmpeg/ffmpeg -c:a aac -ar 44100 -ac 1 -codec:v libx264 \
  
    -profile:v baseline -level 13 -b:v 2000k video_transcoded.mp4 -i video.mp4

  Then to create the MPD I am running this :

  MP4Box -dash 10000 -dash-profile live \
  
    -segment-name video_transcoded video_transcoded.mp4

  I am getting this response at the end, which might be why no player will play my video :

    [DASH] two languages in adaptation set: und will be kept eng will be ignored
  
    DASHing file video_transcoded.mp4
  
    [DASH]: Segment duration variation is higher than the  50% allowed by DASH-IF (min 1.044, max 10.448) - please reconsider encoding

  Here is the output of ffmpeg :

      ffmpeg version N-53477-g689211d-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2016 the FFmpeg developers
  
        built with gcc 5.3.1 (Debian 5.3.1-10) 20160224
  
        configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --enable-frei0r --enable-libfribidi --disable-indev=sndio --disable-outdev=sndio --enable-librtmp --enable-libmfx --cc=gcc
  
        libavutil      55. 19.100 / 55. 19.100
  
        libavcodec     57. 28.100 / 57. 28.100
  
        libavformat    57. 28.100 / 57. 28.100
  
        libavdevice    57.  0.101 / 57.  0.101
  
        libavfilter     6. 39.102 /  6. 39.102
  
        libswscale      4.  0.100 /  4.  0.100
  
        libswresample   2.  0.101 /  2.  0.101
  
        libpostproc    54.  0.100 / 54.  0.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'gladiator.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 1
  
          compatible_brands: isomavc1
  
          creation_time   : 2013-02-12 19:14:56
  
        Duration: 02:50:56.98, start: 0.000000, bitrate: 923 kb/s
  
          Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x544 [SAR 1:1 DAR 40:17], 823 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
          Metadata:
  
            creation_time   : 2013-02-12 19:14:56
  
            handler_name    : 2000.Extended.Remastered.720p.BluRay.x264-HDEVO.mkv.264#trackID=1:fps=23.976@GPAC0.5.1-DEV-rev4283
  
          Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 95 kb/s (default)
  
          Metadata:
  
            creation_time   : 2013-02-12 15:32:26
  
            handler_name    : Sound Media Handler
  
      [libx264 @ 0xaf12920] using SAR=1/1
  
      [libx264 @ 0xaf12920] frame MB size (80x34) > level limit (396)
  
      [libx264 @ 0xaf12920] DPB size (3 frames, 8160 mbs) > level limit (0 frames, 2376 mbs)
  
      [libx264 @ 0xaf12920] MB rate (65214) > level limit (11880)
  
      [libx264 @ 0xaf12920] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
      [libx264 @ 0xaf12920] profile Constrained Baseline, level 1.3
  
      [libx264 @ 0xaf12920] 264 - core 148 r236 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 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=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
      Output #0, mp4, to 'gladiator2.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 1
  
          compatible_brands: isomavc1
  
          encoder         : Lavf57.28.100
  
          Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x544 [SAR 1:1 DAR 40:17], q=-1--1, 2000 kb/s, 23.98 fps, 24k tbn, 23.98 tbc (default)
  
          Metadata:
  
            creation_time   : 2013-02-12 19:14:56
  
            handler_name    : 2000.Extended.Remastered.720p.BluRay.x264-HDEVO.mkv.264#trackID=1:fps=23.976@GPAC0.5.1-DEV-rev4283
  
            encoder         : Lavc57.28.100 libx264
  
          Side data:
  
            cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 0 vbv_delay: -1
  
          Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 69 kb/s (default)
  
          Metadata:
  
            creation_time   : 2013-02-12 15:32:26
  
            handler_name    : Sound Media Handler
  
            encoder         : Lavc57.28.100 aac
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
        Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
      Press [q] to stop, [?] for help

  After transcoding is completed I get this :

  frame=  132 fps= 15 q=25.0 Lsize=    1112kB time=00:00:05.31 bitrate=1713.0kbits/s speed=0.603x    
  
  video:1062kB audio:45kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.414602%
  
  [libx264 @ 0xab63de0] frame I:1     Avg QP:21.29  size:121187
  
  [libx264 @ 0xab63de0] frame P:131   Avg QP:23.40  size:  7372
  
  [libx264 @ 0xab63de0] mb I  I16..4:  9.2%  0.0% 90.8%
  
  [libx264 @ 0xab63de0] mb P  I16..4:  0.9%  0.0%  0.3%  P16..4: 37.2%  7.0%  1.8%  0.0%  0.0%    skip:52.7%
  
  [libx264 @ 0xab63de0] final ratefactor: 21.58
  
  [libx264 @ 0xab63de0] coded y,uvDC,uvAC intra: 48.8% 72.2% 30.7% inter: 8.9% 14.6% 0.8%
  
  [libx264 @ 0xab63de0] i16 v,h,dc,p: 28% 33% 18% 21%
  
  [libx264 @ 0xab63de0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 16% 15%  8%  7%  8%  6% 12%  6%
  
  [libx264 @ 0xab63de0] i8c dc,h,v,p: 52% 21% 19%  8%
  
  [libx264 @ 0xab63de0] ref P L0: 92.9%  5.2%  1.8%
  
  [libx264 @ 0xab63de0] kb/s:1646.80
  
  [aac @ 0xab64c40] Qavg: 112.650

  What can I do to make this work ?

• avformat/dashenc : Enable dash output to work when the output isn’t a local file

  6 janvier 2016, par Raymond Hilseth

  avformat/dashenc : Enable dash output to work when the output isn’t a local file
  Use avpriv_io_move instead of ff_rename to support more than only
  
  the file protocol.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/dashenc.c