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• FFMPEG scale, zoom, and concat filter

  2 août 2018, par Karate_Dog

  I am using ffmpeg for android to produce video with mp4 format. I’m having trouble getting this command to work in FFMPEG, basically I am trying to add two images, scale them, add zoom effect, and finally concat the result into one video file. I have done something like this :

  ffmpeg 
  
  -t 8 -i image1.png
  
  -t 8 -i image2.png
  
  -filter_complex
  
  [0:v]scale=720:720[scl1]; [1:v]scale=720:720[scl2];
  
  [scl1]zoompan=z=if(lte(zoom, 1.0), 1.55, max(1.001, zoom - 0.0010)):d=205, fade=t=out:st=7:d=1[v0];
  
  [scl2]zoompan=z=if(lte(zoom, 1.0), 1.55, max(1.001, zoom - 0.0010)):d=205, fade=t=in:st=0:d=1,fade=t=out:st=7:d=1[v1];
  
  [v0][v1]concat=n=2:v=1:a=0, format=yuv420p[v] -map [v] outputVideo.mp4

  Been tinkering with this command for a while but still can’t get it to work and I got error :

  Input link in1:v0 parameters (size 1280x720, SAR 0:1) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 45:31)
  
  [Parsed_concat_7 @ 0xf0d77600] Failed to configure output pad on Parsed_concat_7

• nvenc : fix encoding with B-frames

  8 janvier 2016, par Anton Khirnov

  nvenc : fix encoding with B-frames
  When B-frames are enabled and the encoder returns success, all currently
  
  pending buffers immediately become valid and can be returned to the
  
  caller. We can only return one packet at a time, so all the other
  
  pending buffers should be transferred to a new ’ready’ fifo, from where
  
  they can be returned in subsequent calls (in which the encoder does not
  
  produce any new output). This bug was hidden by the incorrect testing of
  
  the encoder return value (the return value was overwritten before it was
  
  tested).
  

  • [DBH] libavcodec/nvenc.c

• 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 !