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• 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 ?

  


• how to split video to multi scenes with ffmpeg

  30 mai 2020, par Abdelmelek

  i need to make for loop to extract scenes from imported video each scene i will give it a name like vid1.mp4 vid2.mp4 ...

  



      # Resort the scenes according to the time they occurred
    self.sorted_scenes = sorted(self.sorted_scenes, key=lambda scene_key: scene_key.frame_number)
    strt = datetime.time(0,0,0,0)
    sname = "vid"
    ff = "C:/Users/user/Desktop/segmentation/1.mp4"
    print(f"These are the top {n} scene timestamps:")
    for scene in self.sorted_scenes:
        i = 0
        print(f"- {scene.time_stamp}")
        endt = scene.time_stamp
        command = f"ffmpeg -i ff --ss strt -to endt -copy snamei.mp4"
        subprocess.run(command)
        i = i+1
        stime = {scene.time_stamp}


  



  so i get this error == 
Unrecognized option '-ss'.
Error splitting the argument list : Option not found

  


• libavformat/hlsenc : Allow usage of 'periodic-rekey' with multi-variant streams

  30 avril 2020, par Yaroslav Pogrebnyak

  libavformat/hlsenc : Allow usage of 'periodic-rekey' with multi-variant streams
  This patch adds possibility to use 'periodic-rekey' option with
  
  multi-variant streams to hlsenc muxer. All streams variants
  
  use parameters from the same key_info_file.
  There are 2 sets of encryption options that kind of overlaps and add
  
  complexity, so I tried to do the thing without changing too much code.
  There is a little duplication of the key_file, key_uri, iv_string, etc
  
  in the VariantStream since we copy it from hls to each variant stream,
  
  but generally all the code remains the same to minimise appearing
  
  of unexpected bugs. Refactoring could be done as a separate patch then as needed.
  Signed-off-by : Yaroslav Pogrebnyak <yyyaroslav@gmail.com>
  

  • [DH] libavformat/hlsenc.c