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• How to detect black screen at play time in ijkplayer ?

  31 août 2019, par seaguest

  I am using ijkplayer,I am wondering if it is possible to know if current player is black screen at play time ?

  because some old model mobiles do not support hard-decode and get black screen, I need to know this case then switch to soft-decode.

• FFMEG : run code after complete conversion

  26 octobre 2019, par Сергей Барахтенко

  There is a code that runs FFMPEG

  shell_exec($this->config->item('ffmpeg') . ' -i ' . $path . ' ' . $cmd . ' 1>' . $folder . '/log.txt 2>&1 ');

  And there is the following line, which should, taking into account the peculiarities of the PHP language, work out immediately after shell_exec

  $params = array(
  
      'status' => 'ready'
  
  );
  
  $result = $this->model->editVideo($video_key, $params); 

  This line simply updates the status of the video in the database

  My question is, why doesn’t the further php code work after completion shell_exec ? What could be the catch ?

• How can I mux H.264 RTP output into a container using FFMPEG ?

  23 septembre 2013, par Grad

  I am working on the effects of network losses in video transmission. In order to simulate the network losses I use a simple program which drops random RTP packets from the output of H.264 RTP encoding.

  I use Joint Model (JM) 14.2 in order to encode the video. However, I don't use AnnexB format as my output, instead I choose the output as RTP packets. The JM output is generated as RTP packets with RTP headers and payload as a sequence. After that, some of RTP packets are dropped by using a simple program. Then, I decode the output by using also JM and it's error concealment methods. That gives me a YUV file as output. The format of the output is as follows :

       ----------------------------------------------------------------------
  
       | RTP Header #1 | RTP Payload #1 | RTP Header #2 | RTP Payload #2 |...
  
       ----------------------------------------------------------------------

  I want to make a subjective test with these bitstreams and it's very inconvenient to crowdsource this subjective test with GBs of video data. So, I want to mux these bitstreams into a container (i.e. AVI) by using FFMPEG. I have tried to decode these bitstreams with FFMPEG and FFPLAY ; however, both of them didn't work. I also tried the following command and it didn't work, either.

      ffmpeg - f h264 -i  -vcodec copy -r 25 out.avi

  Which format or muxer should I use ? Do I need to convert these files to any other format ?