#ffmpeg on 2025-04-17 — 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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00:59 <SeiZaNex> o/

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01:55 <YUiNA> trying to fix audio sync in a file

01:55 <YUiNA> instead of setting a -350ms delay to the metadata

01:55 <YUiNA> is there someway to cut -350ms from the audio track then i can remux it

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02:04 <YUiNA> like i can use -ss and -t to set a positive start time, but how do i handle a negative number?

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08:45 <johnjaye> i'm reading the filter doc for 'aevalsrc' but i don't see any concrete reason why i can't use an if statement in the expression

08:45 <johnjaye> i can use floor and sin, but not if. why is that?

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11:13 <kode54> huh

11:13 <kode54> ffmpeg does SIGILL / SIGFPE checks in checkasm for the compile time settings

11:14 <kode54> mpg123 checks for NEON support at runtime with a SIGILL handler :D

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19:18 <jafa> the following command (based on an example) works to extract captions from test.mp4: /usr/bin/ffmpeg -f lavfi -i "movie='test.mp4'[out0+subcc]" -map s output.ssa

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19:18 <jafa> I am trying to work out how to do the same extraction as part of a filter_complex

19:19 <jafa> any input -> filter_complex -> subtitles

19:20 <jafa> (my filter_complex is also doing other things with audio + video)

19:21 <furq> pretty sure that only works with the movie filter

19:22 <jafa> movie has to be the input?

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19:25 <jafa> my goal is to pull ces608 captions from the video

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22:24 <grib> YUiNA: the "adelay" and "atrim" filters might help you.

22:24 <grib> adelay delays audio (padding the start with silence, making the stream longer) and atrim can change the start/end (to make the stream shorter).

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23:28 <Xe> is h.265 commonly deployed enough that it's safe to use it for web-facing video? like in a .mp4 container in a <video> tag

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23:37 <furq> definitely not

23:37 <furq> https://caniuse.com/hevc

23:38 <furq> that's a lot better than i thought but still worse than vp9 and av1

23:38 <furq> and av1 should outperform it and also has less ridiculous licensing

23:42 <compn> agree h265 sucks

23:42 <compn> :D

23:42 <compn> but it all depends on your audience

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23:49 <furq> i'm surprised hevc has gained that much traction in browsers

23:50 <furq> i didn't think any big service was deploying it and browsers are usually loath to implement anything unless they're pressured to

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