ChanServ changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.1.1 is released
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<Guest86>
Hello. I have a very large video (33GB) that is encoded with FFV1 lossless codec, and it is impossible to play on any computer due to how large it is. What settings would you suggest for good quality storage but also compatibility using H.265? Like CRF and preset settings? Thanks!
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<BtbN>
33GB is not large for a video, and shouldn't prevent playback. Are you sure the file is intact?
<JEEB>
ffv1 can be slow to decode
<JEEB>
something like lossless H.264 should be faster to decode
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<linkmauve>
The new Vulkan ffv1 codec might help with that perhaps.
<linkmauve>
If you have a working GPU.
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<scat117>
with bgr0 input (x11grab), is it normal for `-vf libplacebo=format=nv12` to be relatively slow, to the point where using `-vf format` directly (libswscale) is faster?
<scat117>
my intuition would have been that this wouldn't be challenging at all to do in hardware efficiently.
<haasn>
not normal but maybe if you have a weak GPU or slow PCIe that can be the bottleneck?
<haasn>
scat117: just to be sure, maybe try with :extra_opts=preset=fast
<scat117>
haasn: preset=fast doesn't seem to make much of a difference, if any (47fps vs. 48fps). vulkan:llvmpipe does 8fps. swscale AVX impl does 60fps with <30% CPU utilization. 4K/60fps input. Radeon RX 570 GPU. i7-7700k CPU.
<haasn>
scat117: can you test with -init_hw_device vulkan -vf format=bgr0,libplacebo=format=nv12,format=vulkan -f null - ?
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<scat117>
haasn: preset=fast doesn't seem to make much of a difference, if any (47fps vs. 48fps). vulkan:llvmpipe does 8fps. swscale AVX impl does 60fps with <30% CPU utilization. 4K/60fps input. Radeon RX 570 GPU. i7-7700k CPU.
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<haasn>
16:57 <haasn> scat117: can you test with -init_hw_device vulkan -vf format=bgr0,libplacebo=format=nv12,format=vulkan -f null - ?
<haasn>
actually, swscale is faster than libplacebo for this conversion on my end also
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<scat117>
damn. this heat wave is fucking with modems. hope i didn't miss any messages. i do get 60fps at least with format=vulkan. GPU load is still higher than i would expect. and this obviously is not very useful.
<scat117>
haasn: ^^
<haasn>
scat117: I also get slower performance even though my GPU is absurdly powerful, I suspect the overhead here is just too high
<haasn>
I recommend sticking with swscale if you need pure CPU->CPU format conversions without any advanced features
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<scat117>
haasn: okay. thank you for confirming my observation.
<scat117>
this conversion should imho be mentioned in "hardware encoding" documentation places as a possibly not insignificant overhead
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