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• avformat/aviobuf : discard part of the IO buffer in ffio_ensure_seekback if needed

  28 septembre 2020, par Marton Balint

  avformat/aviobuf : discard part of the IO buffer in ffio_ensure_seekback if needed
  Previously ffio_ensure_seekback never flushed the buffer, so successive
  
  ffio_ensure_seekback calls were all respected. This could eventually cause
  
  unlimited memory and CPU usage if a demuxer called ffio_ensure_seekback on all
  
  it's read data.
  Most demuxers however only rely on being able to seek back till the position of
  
  the last ffio_ensure_seekback call, therefore we change the semantics of
  
  ffio_ensure_seekback so that a new call can invalidate seek guarantees of the
  
  old. In order to support some level of "nested" ffio_ensure_seekback calls, we
  
  document that the function only invalidates the old window (and potentially
  
  discards the already read data from the IO buffer), if the newly requested
  
  window does not fit into the old one.
  This way we limit the memory usage for ffio_ensure_seekback calls requesting
  
  consecutive data windows.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/avio_internal.h
  • [DH] libavformat/aviobuf.c

• How to add #EXT-X-PART:DURATION=0.200,URI="filePart271.0.mp4" into .m3u8 in ffmpeg ? [closed]

  11 août 2023, par palak

  So my question is : How do I add #EXT-X-PART:DURATION=0.200,URI="filePart271.0.mp4" to my HLS m3u8 playlist file using FFmpeg ?

  


  And the error i am receiving is Unrecognized option 'hls_part_flags'.
Error splitting the argument list : Option not found.

  


  as well as Unrecognized option 'hls_part_target'.
Error splitting the argument list : Option not found.

  


  Currently my FFmpeg command is the following :
ffmpeg -f lavfi -t 16 -i anullsrc -f lavfi -i testsrc=size=1280x720:rate=30 -c:v libx264 -c:a aac -t 16 -hls_time 4 -hls_playlist_type vod -hls_segment_type fmp4 -start_number 266 -hls_flags single_file -master_pl_name master.m3u8 -var_stream_map "v:0,a:0" -hls_segment_filename 'fileSequence%v.mp4' -hls_fmp4_init_filename 'city.mp4' -hls_base_url './' -hls_segment_filename 'filePart%v.%04d.mp4' -hls_part_flags '+independent' -hls_part_target 0.200 output.m3u8

  


  My expectation is that, How do I add #EXT-X-PART:DURATION=0.200,URI="filePart271.0.mp4" to my HLS m3u8 playlist file using FFmpeg ?

  


• Can an executable be run as a part of a blob-triggered Azure Function ?

  24 décembre 2018, par Dhruv Kapoor

  I know executables are suitable for timer triggers, but since the timer trigger doesn’t require parallel access to the executable, I wasn’t sure if it works for blob triggers. Let’s say I have 10 messages in my queue, will the Azure runtime cause a lock on the executable ? Or will it manage just fine with 10 parallel instances ? The context to this question is a wrapper library (NReco) I’m using around the FFMPeg utility. The binaries for FFMPeg are required during the exeution of my Azure function.