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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<furq> i would suggest not using mp3 unless you have to
<furq> opus will give much better low bitrate performance and aac will do better than mp3 if you need compatibility
<secondcreek> Thank you. FYI The ppl who commissioned this project are stuck in the past and insist on mp3 format. Was like talking to a wall when I suggested otherwise. Had them put it in writing that i mentioned other better formats.
<furq> if it's just speech then maybe downmix to mono and resample to a lower rate
<furq> then -q:a 9.9 or -abr -b:a 32k or something
<furq> probably not worth worrying too much about saving 32kbps though
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<secondcreek> nah, this is for an archive from a community talk radio station. Gotta keep the audio for x years for govmnt audits (that never happen, but is regulation).
<secondcreek> but thx for the info, copied it to my notes.
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<furq> -af aresample=ochl=mono:osr=16000
<furq> obviously that will sound awful if there's any non-speech content
<furq> but then lame -V8 probably will in general
<secondcreek> they have jingles, but the archive is there in case any profanity complaints need to be disproven.
<secondcreek> it's a church radio station :)
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<evilscreww> has anyone seen this
<evilscreww> is it better than yt-dlr
<evilscreww> yt-dlp i mean
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<llyyr> evilscreww: that one is explicitly for downloading livestreams from the start that are already live and can't be rewound
<llyyr> for any other use case yt-dlp is better
<llyyr> also not really related to #ffmpeg
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<evilscreww> sure it is
<evilscreww> ffmpeg is a dependency
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<kmikita> bengalih, try your tests with "-f null -"
<kmikita> also "-benchmark" useful
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<YUiNA> does the order of filters make any diffrence? like "-vf crop,scale,deint" vs "-vf deint,crop,scale"
<termos> yes its running left -> right
<YUiNA> yeah but i mean, is there any benfit to deinterlacing then cropping/scaling vs croping/scaling then deinterlacing
<YUiNA> like is one method faster than the other
<YUiNA> if i crop first then there is less pixels per frame to deint to maybe it's faster?
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<noobaroo> JEEB i think you told me before that 2pass is better only in libvpx-vp9 and that's only because 2pass mode turns on stuff that single pass doesn't use, not actually related to 2 passes themselves being better
<noobaroo> Well at the time, I was asking about 2pass for libx265, so the vp9 stuff was just extra knowledge. But now I am actually trying to use VP9. Is there a way to turn on the 2pass extra algorithms without using 2pass ? I think you might have mentioned a way
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<drew> if I play two videos back to back with something like `mpv --loop-playlist=inf vid1.mp4 vid2.mp4` and compare to `ffmpeg -f concat -i files.txt concatenated.mp4`, there is a small pause on the concatenated file. Is ffmpeg adding this on purpose or is there something I can do to smooth the concatenation?
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<noobaroo> drew I'm waiting for my question to be answered so I might very well be less knowledgeable than yourself, but my experience is that the `-f concat` method is absolute garbage (no offense to ffmpeg creators). It's never worked as intended (at least not as I intended, but maybe how the code intended, idk) for me even once. I use the `-i concat:file1.ts|file2.ts|file3.ts` method always
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<BtbN> YUiNA: I'm not sure if the scale filter is interlacing-aware. It might completely ruin the image. And crop might mess with which field is first
<BtbN> crop and scale order matters for obvious reasons
<BtbN> need to adjust the numbers to make sense at the very least
<kepstin> scale filter will do an interlaced scale (scale each field separately) as long as the stream/frames are correctly marked.
<kepstin> not sure whether the crop filter correctly updates the interlacing metadata, tho. haven't checked that myself.
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<bengalih> @BtbN yes M4B is for audiobooks. AFAIK you can mux mp3 into mp4 but you can't then get that into m4a/m4b format, you get incompatible code errors. The M4B is special in how it contains chapter data for bookmarks. I have never found anyone with a method for putting MP3 straight in there.
<BtbN> I mean, it's just mp4 pretty much, so can't you just mux it in as usual?
<galad> you can, but it won't play on apple softwares
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<bengalih> They can't be muxed into M4B, maybe M4A? But M4B is what supports chapters/bookmarks and no, I've never seen anyone be able to directly do it.
<bengalih> I prefer M4B for audiobook as they are single file and support the chapters. To me, that is worth re-encoding an MP3 into it. They are just spoken word, so you don't really notice quality drop.
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<furq> it can be muxed in but a lot of players are picky about mp3 in m4a
<furq> last i checked some browsers won't play mp3 in mp4 at all
<furq> even with a video stream
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