Recherche avancée

Sur d’autres sites (12784)

• avformat/iamf_writer : Remove nonsense check

  19 février 2024, par Andreas Rheinhardt

  avformat/iamf_writer : Remove nonsense check
  Checking whether a pointer to an element of an array is NULL
  
  makes no sense, as the pointer addition involved in getting
  
  the address would be undefined behaviour already if the array
  
  were NULL.
  
  In this case the array allocation has already been checked
  
  a few lines before.
  
  Fixes Coverity issue #1559548.
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/iamf_writer.c

• Audio Lag Issue in Long-term FFmpeg Live Streaming with x11grab and Pulse

  8 juillet 2024, par Dhairya Verma

  I am currently working on a live streaming project where I use FFmpeg with x11grab and PulseAudio to stream headlessly from a Linux server to an RTMP endpoint. While the setup generally works well, I am encountering an issue where the audio begins to lag behind the video after approximately two days of continuous streaming.

  


  "-hwaccel", "cuda",

"-f", "x11grab",

"-s", "1920x1080",

"-draw_mouse", "0",

"-thread_queue_size", "1024",

"-i", ":1",

"-f", "pulse",

"-r", "60",

"-thread_queue_size", "1024",

"-i", "VirtualSink.monitor",

"-c:v", "h264_nvenc",

"-preset:v", "hq",

"-b:v", "2500k",

"-maxrate", "2500k",

"-bufsize", "10000k",

"-vf", "fps=60,crop=1280:720:320:180,format=yuv420p",

"-g", "60",

"-c:a", "aac",

"-af", "adelay=900|900",

"-b:a", "128k",

"-ar", "44100",

"-fps_mode", "cfr",

"-async", "1",

"-f", "flv",

'RTMP_LINK',


  


  After two days of streaming, the audio noticeably lags behind the video. I have tried adjusting various settings and buffers, but the issue persists.

  


  Could anyone please provide any insights or suggestions on how to address this issue ?

  


• FFmpeg leak while reading image files

  18 septembre 2016, par Tim

  While reading image files using a recent version of FFmpeg I’m encountering a memory leak I’m having trouble tracking down.

  It seems that after filling the AVFrame with avcodec_send_packet and avcodec_receive_frame, my call to av_frame_free is not actually deallocating the AVBuffer objects withing the frame. The only thing I’m not freeing is the AVCodecContext. If I try to do that, I get a crash.

  I’ve created this sample program, it is about as simple as I can get it. This will keep opening, reading and then closing the same image file in a loop. On my system this leaks memory at an alarming rate.

  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  
  
  int main(int argc, char **argv) {
  
      av_register_all();
  
  
  
      while(1) {
  
          AVFormatContext *fmtCtx = NULL;
  
  
  
          if (avformat_open_input(&amp;fmtCtx, "/path/to/test.jpg", NULL, NULL) == 0) {
  
              if (avformat_find_stream_info(fmtCtx, NULL) >= 0) {
  
                  for (unsigned int i = 0u; i &lt; fmtCtx -> nb_streams; ++i) {
  
                      AVStream *stream = fmtCtx -> streams[i];
  
                      AVCodecContext *codecCtx = stream -> codec;
  
                      AVCodec *codec = avcodec_find_decoder(codecCtx -> codec_id);
  
  
  
                      if (avcodec_open2(codecCtx, codec, NULL) == 0) {
  
                          AVPacket packet;
  
  
  
                          if (av_read_frame(fmtCtx, &amp;packet) >= 0) {
  
                              if (avcodec_send_packet(codecCtx, &amp;packet) == 0) {
  
                                  AVFrame *frame = av_frame_alloc();
  
  
  
                                  avcodec_receive_frame(codecCtx, frame);
  
                                  av_frame_free(&amp;frame);
  
                              }
  
                          }
  
  
  
                          av_packet_unref(&amp;packet);
  
                      }
  
                  }
  
              }
  
  
  
              avformat_close_input(&amp;fmtCtx);
  
          }
  
      }
  
  
  
      return 0;
  
  }