Recherche avancée

Sur d’autres sites (19713)

• Running FFMPEG commands inside Docker container with Python corrupts video

  15 novembre 2023, par AFortunato

  I have a Docker container running a Python web server. Somewhere in the server, I'm using
asyncio.create_subprocess_shell to run an FFMPEG command that trims and crops a video like :

  


  ffmpeg -ss {start} -to {end} -i {video_path} -vf "crop={width}:{height}:{x_offset}:{y_offset}" -c:a copy -crf 0 -preset ultrafast {output_file}


  


  Whenever I do this with a video with less than 1080p of resolution, everything works great. But if I use HD, 4k etc videos, whatever timestamps I put in start and end, I always get a 1 second video of the last second of the original video.

  


  I'm calling FFMPEG like this

  


  process = await asyncio.create_subprocess_shell(
            command, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE
        )


  


  I don't see any errors when running this AND the weird part is that, if I enter the container with
docker exec -it <container> sh</container>

  


  And I run the exact same command in ffmpeg, it works perfectly.

  


  I have no idea what the problem can be, can anyone help me ?

  


• Determine hardware acceleration support for a machine running libffmpeg via C++

  11 septembre 2023, par Space Bear

  I'm currently trying to find out how to query a Linux system to get find out if it support Hardware accelerated decoding of a specific video codec. (this is a multi codec application and this is part of choosing the best/fastest codec depending on the situation.)

  


  My first inclination is to leverage FFMpeg as we already use it, specifically ff_find_hwaccel. However this is an internal function.

  


  Second idea would be self implementation using av_hwaccel_next but this is deprecated.

  


  Is there an upto date method to query ffmpeg to determine if a codec has hardware acceleration support on the machine it's running on ?

  


• FFMPEG convert video file from FLV to MP4. Its not running on browser

  9 janvier 2015, par Vikas Burman

  I am using FFMPEG for converting video file from FLV, AVI to mp4.
  FFMPEG is converting file properly on server. I have played that video, Its playing fine but its not running on browser while after converting file from local machine its playing fine on browser also.

  Local Machine : Ubuntu 12.04

  Server Machine : Centos

  Please Help me why this issue is happening.
  Thanks in advance :)