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• Displaying an AVFrame on the screen with SDL 2.0

  22 septembre 2013, par jsp99

  I am working on some code with the help of this tutorial and using the latest development libraries of ffmpeg and SDL. I am stuck at the point where I have to display the decoded frame (AVFrame) on the screen. I am inclined to do the above task i.e, Displaying the AVFrame on screen using the latest API of SDL 2.0 (Using Renderers and Textures alongside the usage of SDL_Window). Frankly speaking, I am not an expert in SDL_Renderer, SDL_Texture and the functions associated with them. But I am reading the documentation in the official site of SDL 2.0 and working my way through them.

  Is there a way to do the following using SDL 2.0 API :

  • Convert the native frame format to a flavour of YUV and display it.

    (OR)

  • If it is possible, display the frame without having to convert it from native format.

  I want to do the above using Renderers and Textures. There doesn't seem to be an easy way to work with them.

  Can anyone guide me through the steps to do the above tasks ?

  PS : Though I have not explicitly tried it, I came across some ways to display AVFrame on the screen by converting the AVFrame format(native) to RGB. But I do not want the native frame format (which is mostly YUV) to RGB conversion, as it is computationally expensive.

  Converting between formats is done by sws_scale()

• Merge Audio and Video using ffmpeg - Python Lib [duplicate]

  15 janvier 2021, par badr

  i have tried

  


  import ffmpeg
video = ffmpeg.input('video.mp4')
audio = ffmpeg.input('audio.mp3')
ffmpeg.merge_outputs(video, audio).run()


  


  and it returns

  


  TypeError: Expected incoming stream(s) to be of one of the following types: ffmpeg.nodes.OutputStream; got <class>&#xA;</class>

  


  and i have tried

  


  import ffmpeg
video = ffmpeg.input('video.mp4')
audio = ffmpeg.input('audio.mp3')
ffmpeg.concat(video, audio, v=1, a=1).output('finished_video.mp4').run()


  


  and it returns

  


  FileNotFoundError: [WinError 2] The system cannot find the file specified


  


  also i did try

  


  import subprocess    
subprocess.run("ffmpeg -i video.mp4 -i audio.mp3 -c copy output.mp4")


  


  and it returns

  


  'ffmpeg' is not recognized as an internal or external command


  


  how can i do it right ?

  


• FFMPEG Output Framecount Different On Audio Files PowerShell

  28 avril 2020, par ilham zacky

  I am using FFPROBE to get some file durations in PowerShell.

  



  For my video it gets the frame count properly but for my audio files it returns a different frame count.

  



  This is my code :

  



  $audioId = "$id.m4a"
$videoId = "$id.mp4"
$duration1 = ffprobe -i $videoId -show_frames 2>&1 | grep -c media_type=video
$duration2 = ffprobe -i $audioId -show_frames 2>&1 | grep -c media_type=audio
echo $duration1
echo $duration2



  



  For video it returns a proper output, but for audio it returns a wrong result.

  



  Any suggestions ?

  



  Thank you