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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<another|>
`-fs 3000M `
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<linsux>
another|: you think it's bad?
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<another|>
... yes. Do you even know what it's doing?
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<LuisF>
Failed to set value '/dev/dri/renderD128' for option 'vaapi_device': Input/output error```
<LuisF>
when trying to use vaapi or
<LuisF>
```[hevc_qsv @ 0x588b6095d840] Using the constant quantization parameter (CQP) by default. Please use the global_quality option and other options for a quality-based mode or the b option and other options for a bitrate-based mode if the default is not the desired choice.
<LuisF>
[hevc_qsv @ 0x588b6095d840] Error getting mfx config interface handle: specified object was not found (-9)```
<LuisF>
when using directly quick sync video.
<LuisF>
Im a bit lost so anyone has already tried to do something like this?
<JEEB>
some people have bene able to utilize the libvpl stuff, but personally I just don't get it as it's all poking vaapi under linux (and d3d11 under windows)
<JEEB>
I would first check with `vainfo` that you indeed have a vaapi driver capable of various functionality available
<JEEB>
also I would recommend posting the full log with `-v verbose` onto a pastebin service of your choice, since multi-line stuff in IRC is not too nice
<JEEB>
yea, it uses the same blocks and qsv seems to use vaapi underneath anyways... so since you gain AMD as well with vaapi usage, I've never really been fully sure why qsv
<LuisF>
Idk as well but I was tasked with it ahah, but since its all the same underneath as long as performance doesn't take a hit Im sure itll be fine
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<kepstin>
https://github.com/Intel-Media-SDK/MediaSDK/wiki/Media-SDK-Shaders-(EU-Kernels) appears to be more or less a summary of what qsv adds on top of vaapi. for encoding, it adds some shader programs that run on the video stream doing lookahead (for additional rate control modes), weighted prection, and motion estimation.
<kepstin>
other than that, it seems to mostly be setting various poorly documented/explained parameters on the encoder based on internal knowledge of how it works :/
<JEEB>
all those vendor specific APIs just bring me to "no-one gets a promotion for promoting a cross-vendor APIs"
<kepstin>
apparently up to the point of being able to resubmit frames for encoding with altered parameters if needed to meet strict bitrate limits.
<kepstin>
JEEB: heh. interesting you say that, given that libvpl (Intel VPL) was originally "oneVPL", part of the "oneAPI" specifications for cross-vendor apis to various accelerator hardware functionality.
<JEEB>
kepstin: that's one of those theoretically cross-vendor things
<kepstin>
but of course, libvpl was a thinly disguised fork of libmfx, and wasn't really suitable for anyone other than intel to use.
<kepstin>
https://www.intel.com/content/www/us/en/developer/tools/vpl/overview.html has a statement about that, "oneVPL is now called the Intel® Video Processing Library (Intel® VPL). The library will no longer be part of the oneAPI specification so that Intel can focus on providing video processing features on Intel GPUs."
<kepstin>
(amusingly, they did manage to provide a cpu backed implementation of the oneVPL apis, i guess as a way to try to demonstrate that the apis weren't completely unsuitable for things other than intel gpus)
<JEEB>
yea
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<kepstin>
hah, intel's been all-in on the ai stuff recently of course; recent libvpl versions add AI based frame interpolation and super-resolution if for some reason you'd like to make your videos look terrible.
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<MillerBOSS>
Is there a way to know what hardware capabilities ffmpeg has access to on any particular machine?
<shibboleth>
ffmpeg -hwaccels
<MillerBOSS>
Thanks shibboleth
<shibboleth>
this ofc depends on the hw AND installed libs/custom compile
<shibboleth>
but the stuff listed there should work as-is
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<BtbN>
That output says nothing about what you can actually use
<BtbN>
It'll happily list that ffmpeg is built for nvenc on a system without nvidia gpu
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