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• Ffmpeg stream rtsp via h264 with low quality

  9 novembre 2017, par dscsdc

  When i stream rtsp with ffmpeg via upd i got lot of errors of error while decoding MB 48 31, bytestream. and i see the video with low quality.

  I stream with ffmpeg according to this command :ffmpeg -i rtsp://x.x.x.x/... http://y.y.y.y:zzzz

  On this way I send the data to ffserver and then I can watch the video via ffplay or vlc according to url :rtsp://w.w.w.w:(port)/live.h264
  (I have ffserve conf that stream to h264 file).

  When i stream via rtsp tcp all is fine, and i see the video well. but when i stream with rtsp udp i got video with very low quality, freezes or gets stuck.

  I want to understand 2 stuff :

  1. I know that udp is less reliability then tcp, but when i watch on stream from another streaming via rtsp udp i see the video with much more quality.
     is ffmpeg has a problem to stream udp or is that because i stream h264 with rtsp udp.
     What can i do to improve performance of ffmpeg with rtsp udp ?

  2. What does it matter witch type of file i stream (on rtsp udp) if this will be h264 or avi or mp4 or ffm or amp ?
     i see lot of streaming that stream amp , and another that streaming h264

• Which is the better way to use ffmpeg ?

  11 mai 2016, par seaguest

  We need ffmpeg to do some video processing, like video format conversion, live stream snapshot..., we won’t go deep in ffmpeg.

  Now I am wondering what would be the better way to use ffmpeg, we are developping in Golang, either we call ffmpeg like shell command line, or we use libav* library of ffmpeg.

  command line:
  
      Pros: 
  
          easy to use, reliable (I got a quality loss problem with library mode), many tutorials
  
      Cons:
  
          the is is a separate process, out of our control, we can't get detailed information of the process, like the video conversion progressing data
  
          the command line way seems not so cool, this is not well integrated in the whole project.
  
  
  
  libav* library:
  
      Pros:
  
          we can have the process detailed data, progressing status....
  
          ...
  
  
  
      Cons:
  
          difficult to use, much less materials

  Could anyone give your idea which is the better way to use ffmpeg ?

  Before this question, I have asked another two questions :

  One is regarding calling libav* library caused the qulity loss problem :
  Why calling libav* library doesn’t have same quality as ffmpeg command line ?

  One is for command line progressing status retrieving problem :
  How to get the realtime output for a shell command in golang ?

• ffmpeg watermark video while uploading

  30 décembre 2019, par Ilia Sotirov

  I have a CMS system for uploading videos using ffmpeg, I cannot figure a way to watermark the videos every time I’m getting errors (video cannot play) or error encoding etc.
  The command for processing the videos is :

  $shell     = shell_exec("$ffmpeg_b -y -i $video_file_full_path -vcodec libx264 -preset {$pt->config->convert_speed} -filter:v scale=426:-2 -crf 26 $video_output_full_path_240 2>&1");

  I have tried this command also :

  $shell     = shell_exec("$ffmpeg_b -y -i $video_file_full_path -vcodec libx264 -preset {$pt->config->convert_speed} -filter:v scale=426:-2 -crf 26 -i watermark.png -filter_complex 'overlay=10:10' $video_output_full_path_240 2>&1");

  This not seems to work.. is there any way I can troubleshoot this ?