BtbN 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 7.0 is released
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<aruns>
Thanks furq
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<aphysically>
haasn: hey, long time. got my hands on a windows machine finally and was sad my old libplacebo scaler wasn't working with BtbN's static gpl builds
<aphysically>
something about no vkGetINstanceProcAddr function and libplacebo built without linking against this function (4090)
<aphysically>
guess I'm gonna have to give up and build it myself....I was hoping maybe vulkan loader just wasn't installed or something but it looks like that's not it
<aphysically>
looks like its statically built with v7.349.0
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<aphysically>
looks like it works if I change the hardware device on windows to the vulkan device and also I add disable_mutliplane=1 (found randomly on internet) lol what's going on haasn
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<BtbN>
Use latest master, not some old release.
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<echelon>
hi, can you use -var_stream_map more than once?
<echelon>
i'm having trouble wrapping the args in double quotes
<echelon>
it interprets the ending quote as literal
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<ta71>
I have a hdmi capture card and I am on m1 mac. how do i capture so that i break up the entire thing in chunks (video and audio) and compress later after all the capture is done?
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<ePirat>
ta71, just do two steps, capture with raw-ish codecs and then later re-encode to whatever you actually want
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<ManDay>
Good evening, is there a way to transform a video V into a PIP view: Start off with V in full view and then shrink it into a defined subarea in N seconds?
<ManDay>
Or is ffmpeg not designed for time dependend trafos?
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<wyatt8740>
Hi, i'm having a weird issue, wondering if something in ffmpeg changed to cause it. I've got a script for streaming/recording my desktop that's worked fine for a year or two, but now suddenly every time there's an alsa buffer xrun the framerate for the video seemingly halves (maybe frames get duplicated) and the framerate stays halved for the remainder of the video until i stop and restart the stream.
<wyatt8740>
This effect is cumulative, so each xrun makes the framerate even worse
<wyatt8740>
the command's a long one but i'll get it
<wyatt8740>
guessing those messages didn't go through, ethernet cable got unplugged
<wyatt8740>
"Hi, i'm having a weird issue, wondering if something in ffmpeg changed to cause it. I've got a script for streaming/recording my desktop that's worked fine for a year or two, but now suddenly every time there's an alsa buffer xrun the framerate for the video seemingly halves (maybe frames get duplicated) and the framerate stays halved for the remainder of the video until i stop and restart the stream."
<wyatt8740>
"This effect is cumulative, so each xrun makes the framerate even worse. the command's a long one but I'll get it"
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<wyatt8740>
or format and then scale (swap order around comma)
<wyatt8740>
some scaling algos might be faster on yuv420p maybe, idk
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<echelon>
no
<echelon>
let me try pix_fmt
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<another|>
i'd subsample after scaling
<echelon>
but appending it to scale didn't work
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<wyatt8740>
another| - fair point but if you're downscaling subsampling first might be fine
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<wyatt8740>
if upscaling definitely do that first
<wyatt8740>
(do scaling first)
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<wyatt8740>
this issue i'm having is going to drive me mad. i haven't changed my hardware i think
<another|>
wyatt8740: what changed?
<another|>
which version?
<wyatt8740>
oh, did my messages not go through?
<wyatt8740>
also it's git master as of yesterday right now but it was happening last week too
<wyatt8740>
before that i hadn't upgraded since last year maybe
<wyatt8740>
(last week i was on last week's git master)
<wyatt8740>
i also updated my kernel and nvidia drivers but i don't think x11grab is suddenly dropping frames every time there's an audio xrun
<wyatt8740>
unless something the video drivers are doing is causing the xrun
<wyatt8740>
somehow
<wyatt8740>
another| - did you see my command line? or was my network flaking out
<another|>
no, i've seen it
<wyatt8740>
i'm on debian sid btw
<wyatt8740>
devuan ceres actually
<wyatt8740>
but basically debian sid
<another|>
so not debian
<wyatt8740>
but ffmpeg is built by me
<wyatt8740>
it's practically debian. I have actual debian installs using the same setups, just easier to dodge systemd this way
<wyatt8740>
but yes
<another|>
wild stab in the dark: multithread regression?
<wyatt8740>
*could* be, possibly.
<wyatt8740>
i have noticed that some codecs like libxvid seem to take longer to start causing issues
<wyatt8740>
(low intensity stuff)
<wyatt8740>
still not sure what would make it start duplicating frames like this where they compound on each other
<wyatt8740>
once my video finally finishes re-encoding and i can upload it somewhere it might make more sense
<wyatt8740>
this is old hardware, btw, i5-3470 (ivy bridge) and a gtx 750 ti
<wyatt8740>
but it's done just fine for this for ages so i don't know what would have changed
<wyatt8740>
it's also my most powerful computer so i can't test on something else
<wyatt8740>
i was wondering earlier if it could be bus contention or something causing my video capture USB and my sound interface USB to fight
<wyatt8740>
but this seems to happen when the captureusb isn't plugged in too
<wyatt8740>
and when i'm using my internal pci card
<wyatt8740>
(for sound)
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<wyatt8740>
and anyway i'd think the genpts and stuff i'm doing would sidestep underrun issues, or at least just make them desync instead of frame duplicating