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 Post subject: Generating h.265 preview image too heavy on CPU.
PostPosted: October 13th, 2020, 7:13 pm 

Joined: March 15th, 2020, 9:53 pm
Posts: 33
Hi,

ffmpg will use 100% of CPU by default.

In case of h.265 files, and especially large h.265 files, one image generation overloads whole server.

I tried to limit ffmpg to some number of cores, but every new process starts unlimited.

What can be done to limit CPU load for these processes?


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 Post subject: Re: Generating h.265 preview image too heavy on CPU
PostPosted: October 13th, 2020, 7:17 pm 
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Joined: March 10th, 2011, 11:14 pm
Posts: 10701
Location: Earth
Hi,

send me via PM at least one of that file (or torrent links where I could download them).

Will make some tests.

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 Post subject: Re: Generating h.265 preview image too heavy on CPU.
PostPosted: Today, 6:24 am 
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Joined: March 10th, 2011, 11:14 pm
Posts: 10701
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It really has nothing to do with h.265 in general.

Those are 8K very large resolution files. It needs more CPU it be able to process them.

You can set "Processes limit" to 1 in "Settings" -> "General". That would help a bit (since it would process one file at a time) or upgrade the CPU if you're dealing with large files constantly.

Edit: actually there is separate "threads" option for ffmpeg tool which does help (but then takes longer to process). I will add that option in "Settings" -> "Process" -> "Preview".

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