#ffmpeg on 2025-04-07 — irc logs at libera.irclog.whitequark.org

2025-03-03 01:06 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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00:10 <catcream> Hey, I use an intel arc a310 card (qsv) and when using vf_scale with input res matching output res the output becomes green. If I scale up or down it works just fine, any ideas?

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00:13 <catcream> tried a patch that patches do_scale, when resolutions match it just runs av_frame_clone instead and it seems to work fine, but I still wonder why this happens. This is not an issue when using software transcoding with x264 or x265

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00:16 <compnn> catcream, is it scaling or just saying its scaling hmm

00:16 <compnn> what ver ffmpeg

00:16 <compnn> what command line

00:17 <catcream> this command generated by jellyfin. If I remove the scale parameter from -vf it works and is not green, also works if I make it anything except 1920x1080

00:17 <catcream> ffmpeg -analyzeduration 200M -probesize 1G -ss 01:33:24.000 -t 2 -init_hw_device vaapi=va:,vendor_id=0x8086,driver=iHD -init_hw_device qsv=qs@va -filter_hw_device qs -hwaccel vaapi -i file:"movie.mkv" -map 0:0 -map 0:1 -map -0:s -c:v hevc_qsv -preset veryfast -b:v 3616000 -maxrate 3616000 -bufsize 7232000 -vf "scale=1920:1080,format=nv12" -c:a aac -ac 6 -ab 384000 -f hls -hls_time 2 -hls_flags +periodic_rekey -hls_segment_type mpegts -hls_segment_filename

00:17 <catcream> "test%d.ts" -hls_playlist_type vod -y "test.m3u8"

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00:19 <catcream> tried streaming the test.m3u8 playlist in vlc and mpv

00:19 <catcream> ffmpeg 7.1.1

00:20 <catcream> https://bpa.st/ZXZQ <- ffmpeg -version

00:22 <compnn> hmm i remember some bugs with nv12

00:26 <catcream> oh so I could try something different? Supported pixel formats: nv12 p010le p012le yuyv422 y210le qsv bgra x2rgb10le vuyx xv30le

00:26 <catcream> no clue what's best

00:29 <another|> why go through a sw filter at all? seem wildly inefficient

00:29 <compnn> catcream, what ver of jellyfin

00:30 <catcream> another|: very true, maybe I should instead patch and ask upstream if vf_scale could be removed when input res = output res

00:30 <catcream> 10.10.6 compnn

00:30 <compnn> catcream, theres a lot of posts about it being a problem in jellyfin https://forum.jellyfin.org/t-bluray-remux-green-screen

00:30 <compnn> and also intel updating drivers

00:31 <compnn> well i dunno the issue but at least you found the workaround so good luck :)

00:33 <catcream> that guy seems to get green screen but I have a green tint over the video. Using quite recent linux kernel and libraries

00:33 <catcream> but yea maybe it's fixed

00:33 <catcream> running latest in gentoo at least

00:36 <another|> No, I mean why download, upload to hw just for a simple sw scale. there's multiple scale filters in hw

00:38 <catcream> another|: like vf_scale_vaapi?

00:38 <another|> for example, yes

00:43 <catcream> okay thanks scale_qsv seems to be a thing too

00:45 <catcream> seems to work but maybe it's just because of my patched ffmpeg mentioned above, ill recompile it

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01:50 <compnn> oh i thought you were saying green screen not green tint

01:50 <compnn> guess i assumed...

01:50 <compnn> i saw some green tint bugs as well

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01:53 <birkoff> i'm trying to compile ffmpeg 7.1 with -fPIC but all the .a files created do not seem to be built like that, checking with readelf -h the Type is REL for each .o file in an .a file

01:54 <birkoff> -fPIC is indeed getting added to the compile commands, I also have --enable-static, --enable-pic and --enable-shared

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