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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<aphorise>
I'm trying to build VLC & Xine from source & am facing a similar message on both that seems to be FFmpeg related it reads as follow: `error: 'AVCodecContext' has no member named 'channel_layout'; did you mean 'ch_layout'?` - any ideas what this is related to or how I may be able to fix it? - https://paste.debian.net/hidden/515a2ce6/ - https://paste.debian.net/1314224/
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<CounterPillow>
This is because the thing you are compiling is relying on deprecated APIs that have since been removed. You can try building against an older FFmpeg release.
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<aphorise>
@CounterPillow, Thanks - any ideas which version(s)? - also I would have thought VLC would be ok with the latest versions of FFmpeg
<CounterPillow>
VLC is famously not ok with latest versions of FFmpeg, VLC3 is the sole reason why some distros still package ffmpeg 4.4
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<aphorise>
CounterPillow, oh wow I didn't know that I'll give it a shot with 4.4 later today - thanks again
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<Ingvix>
does anyone actually know how to use backgroundkey filter? I was trying to sort of do something similar what it claims to do with other filters until I noticed it in the docs. Then learned my distro's ffmpeg seems a bit stuck on an old version and downloaded the latest stable static version to test it out. So far it seems it doesn't do anything to my video as I've tried changing the options a bit
<BtbN>
The filters alone make the keyed out parts transparent
<BtbN>
if you then don't overlay the transparent image over anything, but try to encode it instead, the alpha channel is probably just stripped away and nothing visible is achieved
<Ingvix>
ah, I was sort of suspecting something like that. I shall experiment further
<BtbN>
Both chroma and colorkey have examples in the docs
<Ingvix>
yes, thank you
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<chainik1>
only under certain conditions: when using video with a frame rate above 47, without B-frames, and with AAC/MP3 audio codec. Example command: `ffmpeg -y -t 3 -f lavfi -i "avsynctest=size=1920x1080:framerate=50:samplerate=48000[out0][out1]" -c:v libx264 -g:v 50 -bf:v 0 -c:a aac -f hls -hls_segment_type fmp4 -hls_time 1 -hls_flags split_by_time
<chainik1>
Hi all, I've come across an issue while using the `hls_flag split_by_time` option. Before I proceed to open a ticket, I wanted to inquire here first. The problem I'm encountering is that the segment duration does not align exactly with the specified `hls_time`. Specifically, it seems to be consistently missing one video frame. This issue occurs
<chainik1>
index.m3u8`. First segment is 0.98 seconds long instead of 1 second. Is this a known issue?
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<DeHackEd>
For experimentation, add option -x264-params no-scenecut
<DeHackEd>
hmmm... you're using a generated stream?
<DeHackEd>
still plausible, just not sure if it helps or makes it worse
<chainik1>
no-scenecut, tune zerolatency and preset ultrafast still produce 0.98, 1.0, 1.0, 0.02 segment durations
<chainik1>
I also tried different input types (lavfi avsynctest, file, decklink)
<another|>
chainik1: which ffmpeg version?
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<chainik1>
build today from master, N-114837-g257bc2a82ab
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<chainik1>
okay, my master branch is a bit out of date, currently at 257bc2a82ab6709ddfc8dd9cf570beefcef7d43f
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<another|>
not sure what you mean by out of date. that's current HEAD
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<aphorise>
hey guys I'm trying to build FFmpeg 4.4 - but I get this mathops.h error `operand type mismatch for `shr'` that I know was patched on the latest 7-0... I also tried downgrading binutils as was suggested in a few places all the way back to a 2.26 from 2016 but that also didnt make any difference... any tips on what I could try next?
<aphorise>
Hmm actually just install TextInfo 6.8 did something for me & I was able to build FFmpeg 4.4.4
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<frankplow>
aphorise: What Texinfo 7.0+ version were you getting that error with?
<aphorise>
@frankplow, to be honest I hadn't installed Textinfo on system at all it was whatever was shipped with FFmpeg only so I guess that may have actually been the root of the issue? - I thought only the `t2h.pm` was needed without any Textinfo installed
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<frankplow>
aphorise: FFmpeg depends on Texinfo to generate documentation. If you had Perl installed but not Texinfo that might explain your error. If you don't care about the docs, you can alternatively just --disable-doc in your config flags.
<aphorise>
frankplow, 100% that was the case I had perl no Texinfo - thank you for the --disable-doc tip
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