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Transparent compression layer on Linux? (lemmy.world)

submitted 1 month ago by [email protected] to c/[email protected]

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cross-posted from: https://lemmy.world/post/15706364

Transparent compression layer on Linux?

My use-case: streaming video to a Linux mount and want compression of said video files on the fly.

Rclone has an experimental remote for compression but this stuff is important to me so that's no good. I know rsync can do it but will it work for video files, and how I get rsync to warch the virtual mount-point and automatically compress and move over each individual file to rclone for upload to the Cloud? This is mostly to save on upload bandwidth and storage costs.

Thanks!

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[–] [email protected] 7 points 1 month ago (1 children)

I do something similar for my property's exterior cameras, which are streamed to my VPS in 'real-time'.

You will need to re-encode the footage - videos are already pretty well compressed, so traditional compression methods like 7z (lzma), gz, zip etc being layered on top can't compress them further.

For your solution, I'd probably run a find every minute w/ cron to look for these files in a staging/watch folder, move them to another folder so they aren't picked up on the next run, then re-encode with ffmpeg. Do note that when you re-encode footage, you always lose quality, even if you're on a high quality preset.

I have a feeling that the Handbrake project can do this with a watch folder though, so might be worth looking into that. After a quick search this looks easier to setup than my solution:

https://github.com/HandBrake/HandBrake
https://github.com/shannah/handbrake-watcher

[–] [email protected] 1 points 1 month ago (1 children)

Thank you, this is exactly my use-case, along with some live streaming.

However,

How are you running a find command on a warch folder with continuously streaming video? I believe the IPC process has to end (system has to finish writing to a file) for post-processing (reencoding) to take place? That's why I wanted to do this transparently, since I have no local storage to speak of to maintain a watch folder/cache.
Thanks for the reencoding solution, I'll take a look at handbrake

[–] [email protected] 4 points 1 month ago

If you want a live conversion and can't afford the >100$ it would cost to grab an ssd for a scratchdisk, you might also look into using vlc to grab the video stream from source camera, and encode it out to somewhere else, such as a webserver.

https://wiki.videolan.org/Documentation:Streaming_HowTo/Receive_and_Save_a_Stream/

You might also need a script to make sure it's always up.

Alternatively, there's a good chance that zoneminder will be able to do what you want with just a little tinkering. https://zoneminder.com/