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• Is there a way to convert files from YUV 4:2:0 to MP4 losslessly using ffmpeg on Mac ?

  14 février 2021, par Enrique Perez

  I'm currently working on some image compression research, but I've been having trouble decoding the video for MATLAB. The original files are in *.mkv format from this website : https://console.cloud.google.com/storage/browser/ugc-dataset/original_videos.

  


  At first I tried using a simple copy command like the following :

  


  ffmpeg -i original_videos_LiveMusic_360P_LiveMusic_360P-3be0.mkv -c:v copy original_videos_LiveMusic_360P_LiveMusic_360P-3be0.mp4


  


  With that, I got the following error :

  


  


  [mp4 @ 0x7f932a808200] Could not find tag for codec rawvideo in stream #0, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument

  


  


  I was able to convert the files to *.avi, but unfortunately these are not readable by MATLAB on Mac OS. I need the video conversion to be lossless, so I can't figure it out. The video codec is YUV 4:2:0.

  


  Thank you for your help, it is greatly appreciated.

  


• How to scale video in front of image using ffmpeg ? [closed]

  29 juillet 2022, par Nigrimmist

  What i have :

  


  png picture dem.png (not transparent) and video cat.mp4

  


  Current result :

  


  

  


  by executing :

  


  ffmpeg -i cat.mp4 -framerate 30 -i dem.png -filter_complex "[1][0]overlay=x=100:y=100" -c:a copy -movflags +faststart out2.mp4


  


  How can i scale mp4 in case i know paddings/required height/width of scaled mp4 here ?

  


  Very beginner in ffmpeg. I know, i need to use scale param, but can't understand how to do it with my current ffmpeg command.

  


  Maybe someone know how to do it ?

  


  Files are here if you need : https://drive.google.com/drive/folders/1gKJCyVU0IgJ8g3zWFhCA-L93lDOWyOS-?usp=sharing

  


• How to change python runtime in firebase functions

  1er août 2023, par MrBom

  I currently have python311, but it seems that it doesnt include ffmpeg. So I'm looking for ways to either change to python39 or figure out how to install and use ffmpeg.

  


  When I try

  


  import subprocess
print(subprocess.run(shlex.split("ffmpeg -version")))


  


  inside a firebase function, all I get is FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg'
I've tried a few different places like /opt/bin/ffmpeg or ffmpeg/ffmpeg since I have have ffmpeg inside the folder functions, but it always the same error.

  


  Recommendation to use python39 for ffmpeg

  


  Edit : Things I found but couldnt get it to work :

  


  gcloud functions deploy <my function="function"> --runtime python39</my>

  


  Made this from gcloud