[deskamess]

> - ffmpeg CLI now all run in parallel

I think I read about this a few months ago but don't remember the details. What exactly does this do? Does it result in faster encoding/decoding if you have multiple filter graphs (for example a single cmd line that transcodes to new audio, extracts image, creates a low res)

> - ffmpeg CLI loopback decoders

No idea what this is...

Edit: threading => https://ffmpeg.org//index.html#cli_threading, loopback => https://ffmpeg.org/ffmpeg.html#Loopback-decoders

Loopback decoders are a nice concept. So could I use this to create a single ffmpeg command to extract images periodically (say 1/s) and then merge them into a horizontal strip (using the loopback decoder for this part)?

[gyan]

You don't need a loopback decoder for that. The periodic extraction will depend on a filter, and you can just clone and send the output of that filter to the tiling filter.

[deskamess]

Had to go to ChatGPT for help. It appears that you need to know how many tiles to stitch. I was hoping to have that dynamically determined. Not sure if loopback will help.

CGPT said: ffmpeg -i input.mp4 -vf "fps=1,tile=3x1" -frames:v 1 output_stitched.png

Gemini: ffmpeg -i input_video.mp4 -vf "fps=1,scale=220:-1" -c:v png output.png