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• Adding a Skip Command to Discord.Net

  16 août 2017, par ComedicChimera

  I have a music bot for my Discord server, that is running on Discord.Net and I am trying to implement a skip feature for my bot. Because of the way I have my bot setup, all I need to do is end the current stream to skip. The problem is I can’t figure out how to do that without causing an exception or some other error. Here is my code for playing. (create stream returns an ffmpeg process)

  var output = CreateStream(url).StandardOutput.BaseStream;
  
                      Music.stream = Music.client.CreatePCMStream(AudioApplication.Music);
  
                      await output.CopyToAsync(Music.stream);
  
                      await Music.stream.FlushAsync().ConfigureAwait(false);

  And the FFMPEG code :

  private Process CreateStream(string path)
  
      {
  
          return Process.Start(new ProcessStartInfo
  
          {
  
              FileName = "ffmpeg.exe",
  
              Arguments = $"-hide_banner -loglevel panic -i \"{path}\" -ac 2 -f s16le -ar 48000 pipe:1",
  
              UseShellExecute = false,
  
              RedirectStandardOutput = true
  
          });
  
      }

  Music is a public class that just holds a bunch of variables so other methods can access them. (as module base is abstract)

• How to seek by msec with ffmpeg ?

  26 mai 2014, par Srv19

  I am trying to seek in video by milliseconds with ffmpeg. I have been trying to use code from this question, which uses avformat_seek_file (i use it with -1 for stream number and AVSEEK_FLAG_ANY flag).

  After that is called, i try to read next frames, that is :

  if (av_read_frame(fmt_ctx, &pkt) >= 0)
  
  {
  
      int ret = 0;
  
  
  
      if (pkt.stream_index == video_stream_idx) {
  
          /* decode video frame */
  
          ret = avcodec_decode_video2(video_dec_ctx, frame, got_frame, &pkt);
  
          if (ret < 0) {
  
              fprintf(stderr, "Error decoding video frame\n");
  
              return ret;
  
          }
  
  //do something with frame
  
  }

  However, the frame->pts of retrieved frame always holds the time of the frame that was immediatly after last frame that was read before seeking.

  Edit : In spite of frame->pts forming unbroken sequence, seeking does occur. For some bizarre reason next frame i read is the first one. In fact, after i run :

     int got_frame = 0;
  
     do
  
     if (av_read_frame(fmt_ctx, &pkt) >= 0) {
  
         decode_packet_ro(&got_frame, 0);
  
         av_free_packet(&pkt);
  
     }
  
     else
  
     {
  
         read_cache = true;
  
         pkt.data = NULL;
  
         pkt.size = 0;
  
         break;
  
     }
  
     while(!got_frame || this->frame->pts*av_q2d(video_dec_ctx->time_base) * 1000 < tsms);

  next frame i read is always the first one.

• avformat/mov : Fix memleak upon encountering repeating tags

  14 juin 2020, par Andreas Rheinhardt

  avformat/mov : Fix memleak upon encountering repeating tags
  mov_read_custom tries to read three strings belonging to three different
  
  tags. When an already encountered tag is encountered again, a new buffer
  
  for the string to be read is allocated and stored in the pointer
  
  destined for this particular tag. But in this scenario, said pointer
  
  already holds the address of the string read earlier, leading to a leak.
  This commit therefore aborts the reading process upon encountering
  
  an already encountered tag.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/mov.c