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• Problems with muxing fmp4 stream with libav

  20 juillet 2020, par Elias Wagnerberger

  currently i have an application that is supposed to send fragmented mp4 data over a websocket to a client for it to be played there.

  


  i have a working implementation that pipes the raw frames to a spawned ffmpeg process and then reads fragmented mp4 segments from the output pipe before it sends those on to the client where the client then displays the video correctly.

  


  my problem is that when i try to make an implementation using libav it doesnt seem to work. my libav config uses libx264rgb to encode the frames before muxing them to a mp4, but when i try to play the provided segments in a browser using MSE it spits out an error. after having checked chrome ://media-internals i have figured out that the problem lies in the moov box that is one of the two initialization boxes of a fmp4 stream.

  


  chrome apparently has a problem with parsing that box when its sent from libav, but not when its sent from ffmpeg.

  


  my question is :
What is the correct muxer configuration of libav so that it creates a fragmented mp4 stream where the client can recieve media boxes from the middle, after having been provided the init boxes ?

  


• Make mp4 from continuous jpg in Node.js

  15 mai 2020, par Dinozavr

  Client is sending continuous jpg to my server.
The issue is : how to make one mp4 file from all these jpg files ?

  



  I can save them all and use ffmpeg with “filename%3d.jpg”, when client finish sending files.

  



  But is there any way to make it real-time ?

  


• Sending big packets gets Bad Address error

  30 mars 2012, par Roi

  Im writing a live webcam stream using ffmpeg and sdl on C.
  my platform is linux.

  my application is a client server based.
  The client is reading from the webcam, produce an AVPacket, then send to server.

  My problem is, that the AVPacket struct has a member named data which is approximately 600k.
  At first, i had not checked the send() return value,
  So, of course the packet had failed to send completely.

  But after I checked, the send() returns Bad Address error at the second iteration of the big packet.
  the length of the data packet must be correct because is supplied from the AVPacket struct.

  It sends 2 members of the AVPacket before, so the server is up and functional.

  The problematic section :

      int send_video_data(video_client_t *client, void* buf, int length)
  
      {
  
          int rc;
  
  
  
          while (length > 0)
  
          {
  
             if ((rc = send(client->sockfd, buf, length, 0)) == -1) {
  
                       perror("failed sending data to server");
  
                       exit(1);
  
              }
  
  
  
              length-=rc;
  
              buf+=rc;
  
          }
  
  
  
          return 0;
  
  
  
      }

  Any one got any ideas why it's not working ?
  Thanks in advanced !