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• Use ffmpeg to create DVB-T SD like video

  30 août 2015, par STeN

  How is the correct command line syntax please, which creates with use of FFMPEG from 720x576 picture the MPEG4 (MP4 file) or MPEG2 (MPEG-TS file) video file with the same resolution (i.e.720x576) but DAR 16:9 ?

  Is it possible with the standard 720x576 png file as input or I need to manipulate the SAR of the imput image first ?

  Could be the output interlaced ? I would like to have video close to the standard DVB-T SD stream. e.g. yuv420p, 720x576, SAR 64:45 DAR 16:9.

• How to create an H264 video for specific Libav decoding

  16 octobre 2013, par James491

  I'm creating a program that decodes and displays videos using Libav. I have complete control over the videos the program uses because I make them beforehand. I am able to seek and decode the videos as needed but only after adjusting to a few quirks of x264 encoded videos. For instance, I have to add 8-10 extra frames at the end of my videos to be able to decode and seek to the original last frame. Is it possible to further customize the encoding of an H264 video using ffmpeg or another application, or perhaps some parameters I can initialize in AVFormatContext or AVCodecContext, in order to solve something like decoding the last frames ? Also, are there any specifics I can add to the video file or implement in decoding to decrease seek time, since all seek commands and positions are predetermined ? My current seeking function is just composed of an avformat_seek_file(...) followed by avcodec_flush_buffers(...). I am already seeking to key frames. I am willing to read and learn if all you have is a recommended page or article to investigate.

• PHP : Create image from video using ffmpeg

  17 octobre 2013, par user2715503

  i put php_ffmpeg.dll in php/ext(xampp) and added extension in php.ini.

  Also putswscale-0.dll, pthreadGC2.dll, avutil-50.dll,avformat-52.dll,  avdevice-52.dll, avcodec-52.dll in SysWOW64 folder for windows 8 64.

  I created folder in drive c:/ffmpeg in put ffmpeg package.

  now when I check phpinfo I see that ffmpeg worked but ffmpeg command doesn't not work. how to fix this ?

  Here is my code :

  <?php
  
  $infile = 'C:\xampp\htdocs\mem\12.mp4';
  
  $outfile = 'C:\xampp\htdocs\mem\1.jpg';
  
  exec("C:\ffmpeg\bin\ffmpeg.exe -i " . escapeshellarg($infile) . " -an -ss 00:00:03 -an -r 1 -vframes 1 -y " . escapeshellarg($outfile) . " 2>&1", $output, $returnValue);
  
  if (!file_exists($outfile)) {
  
       die("Could not generate thumbnail. ffmpeg output: \n\n" . implode("\n", $output));
  
  }
  
  ?>