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• lavc/opusdsp : rewrite R-V V postfilter

  2 novembre 2023, par Rémi Denis-Courmont

  lavc/opusdsp : rewrite R-V V postfilter
  This uses a more traditional approach allowing up processing of up to
  
  period minus two elements per iteration. This also allows the algorithm
  
  to work for all and any vector length.
  As the T-Head C908 device under test can load 16 elements loop, there is
  
  unsurprisingly a little performance drop when the period is minimal and
  
  the parallelism is capped at 13 elements :
  Before :
  
  postfilter_15_c :         21222.2
  
  postfilter_15_rvv_f32 :   22007.7
  
  postfilter_512_c :        20189.7
  
  postfilter_512_rvv_f32 :  22004.2
  
  postfilter_1022_c :       20189.7
  
  postfilter_1022_rvv_f32 : 22004.2
  After :
  
  postfilter_15_c :         20189.5
  
  postfilter_15_rvv_f32 :    7057.2
  
  postfilter_512_c :        20189.5
  
  postfilter_512_rvv_f32 :   5667.2
  
  postfilter_1022_c :       20192.7
  
  postfilter_1022_rvv_f32 :  5667.2
  

  • [DH] libavcodec/riscv/opusdsp_init.c
  • [DH] libavcodec/riscv/opusdsp_rvv.S

• avformat/hls : reduce default max reload to 3

  15 mai 2023, par Michael Niedermayer

  avformat/hls : reduce default max reload to 3
  The 1000 did result in the appearance of a never ending reload loop
  The RFC mandates that "If the client reloads a Playlist file and finds that it has not
  
  changed, then it MUST wait for a period of one-half the target
  
  duration before retrying." and if it has changed
  
  "the client MUST wait for at least the target duration before attempting to reload the
  
  Playlist file again"
  Trying to reload 3 times seems a better default than 1000 given these
  
  durations
  Issue found by : Сергей Колесников
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/hls.c

• ffmpeg avformat_open_input() function causes memory leak when receiving live stream

  12 septembre 2023, par george_d

  I have live streams (can be UDP or HLS, video codec is H264), from which I grab frames for further processing.

  


  For this purpose, I use ffmpeg + nvjpeg + cuda libraries.

  


  However I noticed memory leak - memory usage periodically (every 10-20 seconds) is increased by 100-400 KB, the amount and period may vary.

  


  After disabling pieces of code one by one, I realized that it is avformat_open_input() which causes memory leak.

  


  No matter which buffer settings (https://ffmpeg.org/ffmpeg-protocols.html#udp) I choose for UDP, the leak still persists. Same goes for HLS streams.

  


  I tried to find anything related to this problem, but all the sources I found claimed that this problem took place in the past and has been fixed.

  


  Is there some mysterious setting I am missing, so that memory could be freed properly ?

  


  Or is this memory supposed to be freed when processing frames (i.e. using av_read_frame() and av_packet_unref(), etc) ?

  


  Minimal example of code to reproduce the problem :

  


  avformat_example.cpp

  


  #include &#xA;extern "C" {&#xA;    #include <libavformat></libavformat>avformat.h>&#xA;    #include <libavcodec></libavcodec>avcodec.h>&#xA;}&#xA;&#xA;int main(int argc, char *argv[]){&#xA;    if (argc &lt; 2) {&#xA;      return 1;&#xA;    }&#xA;&#xA;    char* inputSource = argv[1];&#xA;    AVFormatContext *ctx = NULL;&#xA;&#xA;    if (avformat_open_input(&amp;ctx, inputSource, NULL, NULL) != 0) {&#xA;        av_log(NULL,&#xA;               AV_LOG_ERROR,&#xA;               "Cannot open &#x27;%s&#x27;",&#xA;               inputSource);&#xA;        return 1;&#xA;    }&#xA;&#xA;    /*&#xA;    This loop is placed here to demonstrate&#xA;    avformat_open_input() causing leak.&#xA;    Actually, instead of noop loop there is logic of getting and processing frames,&#xA;    but it doesn&#x27;t matter now.&#xA;    As loop goes on, the amount of leaked memory increases.&#xA;    */&#xA;    while(true) {&#xA;      sleep(1);&#xA;    }&#xA;&#xA;    return 0;&#xA;}&#xA;

  


  Compile with :

  


  g++ avformat_example.cpp -lavcodec -lavutil -lavformat -I/usr/include/ffmpeg-cuda -o avformat_open_input_example


  


  Run :

  


  ./avformat_open_input_example "udp://127.0.0.1:5000?reuse=1&pkt_size=1316&buffer_size=1310720&fifo_size=40000"


  


  Version of ffmpeg underlying libraries :

  


  libavutil      58.  7.100 / 58.  7.100
libavcodec     60. 11.100 / 60. 11.100
libavformat    60.  5.100 / 60.  5.100
libavdevice    60.  2.100 / 60.  2.100
libavfilter     9.  8.100 /  9.  8.100
libswscale      7.  2.100 /  7.  2.100
libswresample   4. 11.100 /  4. 11.100