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• Why does ffmpeg generate a mpeg-dash mpd with long timeShiftBufferDepth even with window_size of one minute ? [closed]

  1er février 2024, par igorblima

  I'm having a problem with ffmpeg when i try to create a dynamic mpd from rtmp livestream. The vídeo integrity its ok and works fine, but the only problem is with the timeShiftBufferDepth. The command specifies how much window_size to have, but for some reason the timeShiftBufferDepth generated by ffmpeg doesn't respect that. I specified 1 minute of window_size, but for some reason unknown to me, the timeShiftBufferDepth is generated as 8 minutes

  


  the command :

  


  ffmpeg -i rtmp://localhost:1935/live/stream -c:v libx264 -b:v 1000k -c:a aac -b:a 128k -strict experimental -f dash -window_size 60 -utc_timing_url https://time.akamai.com/?ms -seg_duration 5 -remove_at_exit 1 -dash_segment_type mp4 h264.mpd


  


  result :

  


  timeShiftBufferDepth="PT8M19.9S"


  


  how i say previously, the mpd works fine in the player. The only issue is with that incorrect timeShiftBufferDepth

  


  i read the ffmpeg documentation https://ffmpeg.org/ffmpeg-formats.html#Options-19

  


• avformat/matroskaenc : Don't check twice whether to write tags

  15 juin 2022, par Andreas Rheinhardt

  avformat/matroskaenc : Don't check twice whether to write tags
  Because not all metadata is written as tags, the Matroska muxer
  
  filters out the tags that are not written as tags.
  
  Therefore the code first checks whether a Tag master element
  
  needs to be opened for a given stream/chapter/attachment/global
  
  metadata. If the answer turns out to be yes, it is checked again
  
  whether a given AVDictionaryEntry is written as a tag.
  
  This commit changes this : The Tag element is opened unconditionally
  
  and in case it turns out that it was unneeded, it is discarded again.
  
  This is possible because the Tag element is written into its own
  
  dynamic buffer.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/matroskaenc.c

• How to convert image sequence to video using C ? [closed]

  29 mars 2021, par user13899543

  I would like to know a way(s) to convert an image sequence (.bmp) to a video file using C. The video may be compressed or not. The code is to be included in a cross-platform commercial app, so the suggestions need to have permissive licenses.

  


  What I have tried :

  


  I tried openCV (apache license), but this library seems to be C++ only and should not be used from C.

  


  I tried using systems calls from inside the C app to ffmpeg and python-openCV, but of course, this is inconvenient as it forces the client to install extra software.

  


  I cannot do dynamic linking to ffmpeg (LGPL) because we cannot fullfill all the EULA requirements (the reverse engineer one, for example).

  


  ...

  


  So any suggestions ?

  


  Thanks !