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• avcodec/cbs_av1 : keep separate reference frame state for reading and writing

  18 novembre 2019, par James Almer

  avcodec/cbs_av1 : keep separate reference frame state for reading and writing
  In scearios where a Temporal Unit is written right after reading it using the same
  
  CBS context (av1_metadata, av1_frame_merge, etc), the reference frame state used
  
  by the writer must not be the state that's the result of the reader having already
  
  parsed the current frame in question.
  This fixes writing Switch frames, and frames using short ref signaling.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/cbs_av1.c
  • [DH] libavcodec/cbs_av1.h

• cbs_h2645 : Allocate all internal buffers with padding

  16 octobre 2018, par Mark Thompson

  cbs_h2645 : Allocate all internal buffers with padding
  Any of these buffers (for both H.264 and H.265) might reasonably be
  
  parsed using the bitstream reader, so include padding on all of them.
  

  • [DH] libavcodec/cbs_h2645.c
  • [DH] libavcodec/cbs_h264_syntax_template.c

• ffmpeg : memory not freed on multi-threaded decoding

  31 mai 2020, par toby_e

  I am developing a video player based on the ffmpeg libraries and have run into a rather strange memory increase or failure to decrease memory when unloading a video file. My code is based on various examples of demuxing, decoding and scaling video and audio frames - but with the excecption that i have put each of these steps into seperate threads to avoid waiting for time-consuming calls. Everything works perfectly, but Visual Studio shows that Process Memory does not decrease when i call the various avclose and avfree calls. My Windows task manager confirms these memory increases that continue into the gigabyes !

  



  My player is roughly made up by two clases with the following calls to the ffmpeg libraries :

  



  —

  



  READER :

  



  Open (on main thread) : avformat_open_input(), avformat_find_stream_info()

  



  Read (on seperate thread) : av_read_frame()

  



  Close (on main thrad) : avformat_close_input()

  



  DECODER :

  



  Open (on main thread) : avcodec_find_decoder(), avcodec_alloc_context3(), avcodec_parameters_to_context(), avcodec_open2()

  



  Decode (on seperate thread) : avcodec_send_packet(), avcodec_receive_frame()

  



  Close (on main thread) : avcodec_free_context()

  



  —

  



  Is threre any issues with opening/closing on the main thread and reading/deconding on other threads ?