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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<chico> hi there, I've been playing with screen captura and hwdec, and I'm trying to figure out if I can round the region selected with -select_region to a multiple of 32 to avoid the green bands
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<furq> hwdec?
<chico> hardware acceleration, using vaapi and hwupload, if that makes sense
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<another|> hwenc != hwdec
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<furq> probably pastebin the command line and output
<furq> you shouldn't be getting green bands with non-mod32 hwenc
<chico> aaah right, sorry for the confusion, yes, let me get the paste
<furq> if you really do need it to be mod32 then you can crop or pad with e.g. "crop=w='iw-mod(iw,32)':h='ih-mod(ih,32)'"
<furq> before hwupload
<chico> https://0x0.st/Kihb.txt there's probably missused options on the command, since I'm playing around to learn and I'm almost completely new
<chico> with that command, if the region selected is not a multiple of 32, it will show up green bands on right and/or bottom sides
<chico> Got the idea from this SO comment, it worked when I tried https://stackoverflow.com/questions/60778078/ffmpeg-h264-qsv-green-line-at-bottom-of-video
<chico> those crop parameters are supposed to be added to the command as is?
<chico> (thank you)
<furq> oh well that's fun
<furq> i guess that hwenc doesn't set the internal crop flags
<furq> and yeah that crop filter just crops anything to mod32
<chico> I got it from the ffmpeg docs kinda blind, did I pick a bad filter?
<furq> the command you pasted looks fine although i don't have a box with vaapi to test on
<furq> basically h264 is always internally mod16 but with internal crop flags to hide the garbage at the edges
<furq> and hevc is the same but not necessarily mod16
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<furq> i guess those flags just aren't being set
<furq> you can set it with this after the fact but it's probably better to just crop it ahead of time
<chico> I would still have to calculate how much do I crop, right? Or I could use something like your command above?
<furq> i think with the bitstream filter you'd have to calculate it
<chico> should I try others API? I only felt like VAAPI was okay from https://trac.ffmpeg.org/wiki/HWAccelIntro
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<chico> also, I managed to add the crop params you suggested before, I think it doesn't like it, posting just one line:
<chico> [hevc_vaapi @ 0x56524165f940] Cropping information on input frames ignored due to lack of API support.
<furq> did you crop before hwupload
<chico> ah, I put it just after, let me try again, sorry
<chico> yes sir that was the issue indeed, thanks
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