#ffmpeg on 2025-02-27 — irc logs at libera.irclog.whitequark.org

2024-12-27 20:43 Marth64 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 is released

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03:16 <bray90820> Would converting an mkv to mp4 h.264then to mp4 H.265 result in the same qulity or would it be lower?

03:17 <bray90820> I jut don't wanna have to reimport all my dvd's again

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03:20 <furq> it would absolutely be worse quality

03:21 <furq> i also don't know if it's really worth it for dvdrips

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03:22 <bray90820> Ok

03:23 <bray90820> I think it's worth it since the file size is way less

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13:45 <obcecado> hi

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15:11 <obcecado> i'm currently using the pullup filter to manipulate 1080i50 to 1080i60 but the output turns out a bit jittery, i'd appreciate if anyone can advice on how to smoothe the output

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15:25 <devinheitmueller> The pullup filter was never really designed to go from i50 to i60. It is meant for telecined content. You would probably be best to deinterlace, use the fps filter, than interlace.

15:27 <devinheitmueller> (or you could use the minterpolate filter rather than fps, which *might* produce smoother results depending on your content)

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15:35 <obcecado> thank you for your reply devinheitmueller

15:35 <obcecado> i've played a bit with tblend which rendered results pretty much in realtime

15:35 <obcecado> minterpolate was *very* slow

15:35 <obcecado> less than 1fps

15:36 <devinheitmueller> Yeah, tblend works too. minterpolate has lots of dials you can play with, but not sure how well it keeps up with realtime.

15:37 <obcecado> i'll run a few more tests the way you suggested. deinterlace then change framerate then interlace again

15:37 <obcecado> thank you for your time

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15:39 <devinheitmueller> Yeah, blending/interpolation on interlaced content is going to produce pretty crummy results.

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22:42 <hsv> hi, i run this command 3 times:

22:42 <hsv> ffmpeg -i keyframes.mp4 -c:v libx265 ... -vf "$filters" output.mp4

22:43 <hsv> where "$filters" is a specific variant of trnspose, crop, and scale.

22:44 <hsv> apparently this can be done in a single command but i'm unable to find the magic

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23:40 <hsv> ooh, this works... but no idea if it's optimal -

23:42 <hsv> filters=('scale=...' 'transpose=1,crop=...,scale=...' 'transpose=2,crop=...,scale=...')

23:42 <hsv> ffmpeg -r 10 -i keyframes.mp4 -filter_complex "[0:v]split=3[s0][s1][s2]; [s0]${filters[0]}[v0]; [s1]${filters[1]}[v1]; [s2]${filters[2]}[v2]" -map '[v0]' -map '[v1]' -map '[v2]' -c:v libx265 -f tee "[select=\'v:0\']output_0.mp4|[select=\'v:1\']output_1.mp4|[select=\'v:2\']output_2.mp4"

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23:54 <hsv> the output files are smaller than running 3 commands separately.

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