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• How do I search for files inside a directory, then burn the name of that directory into the files inside using ffmpeg ?

  23 janvier 2021, par ematogra

  I'm struggling to articulate this question- but I'm after a way of searching for files inside any directory that may exist in my search area (ie. not specifying the name of the directory), then using that directory name as a burn in on the files I have inside it, using ffmpeg ?

  


  So for example, say I had a folder with my script inside it. I've just created a folder called "day 01" inside the folder with the script, with some mxf files inside that. If I run my script, I want it to find the mxf files inside "day 01" then run ffmpeg and have that write "day 01" as a burn in on the picture of those mxf files.

  


  I know how to do the burn in, I just don't know how to reference the directory "day 01".

  


  Hope that makes sense. Thanks in advance.

  


• 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 !

• Creating .ts chunks from .mp4 file

  11 juin 2015, par kopalvich

  I need to create a .ts chunks from a .mp4 file without using ffmpeg API. I have already implemented this task using ffmpeg API, and it works, but my team lead wants me to get rid of it, and it is impossible to convince him against that. The code is supposed to run under load.

  I have already found out how to read mp4 format, where to find frames, their offsets and sizes in a file, their pts’s, for audio and video. A huge achievement for me as I haven’t been working in this area for long.

  All I managed is to create playlist where each chunk starts with I-frame. I feed the start and stop pts’s of playlist entry to the old code(slightly modified) using ffmpeg API, and it creates proper ts chunks.

  But but to create ts chunks without ffmpeg API I still cannot.

  At first I tried to read the code of nginx rtmp module, the hls part of it, but couldn’t understand anything there. It’s too complex and I lack specific knowledge.
  Now I’d like to read something on ts format. Can anyone advise where to look ?

  Thanks.