#ffmpeg on 2024-11-12 — irc logs at libera.irclog.whitequark.org

2024-04-11 19:01 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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14:10 <wodim> I am using yadif to deinterlace a video but the resulting output has the same fps as the source, which is incorrect and now the video looks less fluid. the source is 25 fps resulting in 50 fps but the output is 25 fps deinterlaced. how to fix this?

14:11 <BtbN> By setting the respective yadif settings

14:11 <BtbN> The default mode combines two fields into one frame

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14:12 <wodim> I find that surprising since, *I believe* the source has metadata that specifies the correct settings

14:12 <DeHackEd> https://ffmpeg.org/ffmpeg-filters.html#yadif-1

14:12 <BtbN> How would the source have metadata for yadif settings?

14:12 <DeHackEd> the setting really only comes down to interlaced or not, top field or bottom field first

14:13 <wodim> the source seems to have metadata for tff

14:13 <BtbN> Yes, so?

14:13 <wodim> but not for mode, which is the issue here, I guess?

14:13 <BtbN> Why would that switch yadifs mode of operation?

14:13 <wodim> I was expecting yadif to do the sane thing by default

14:14 <BtbN> what same thing?

14:14 <BtbN> yadifs default mode is send_frame

14:14 <BtbN> so one output frame per input frame

14:14 <BtbN> if you want one per field, change the mode

14:15 <wodim> sorry, I mean: I was expecting yadif not to default to drop half the video frames

14:15 <BtbN> It doesn't.

14:15 <BtbN> It combines two fields into one frame

14:16 <wodim> if you use send_frame (default) instead of send_field, you end up with half the framerate. isn't that dropping half the frames?

14:16 <DeHackEd> which should make a higher quality frame, rather than effectively producing something that's half height

14:16 <wodim> at least for my specific use case

14:16 <BtbN> no, you end up with the same framerate

14:17 <wodim> so it depends on whether you value framerate over resolution?

14:17 <BtbN> Just that now every frame contains one whole frame instead of two fields

14:17 <wodim> yes, I think I understand now

14:18 <BtbN> I think the highest quality deinterlacer in ffmpeg right now is nnedi

14:18 <BtbN> But it's slow as hell

14:19 <wodim> thank you both for explaining it to me

14:26 <DeHackEd> oh? I could use a high quality (if slow) deinterlacer..

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14:34 <DeHackEd> ah.. I see why now...

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15:22 <kepstin> note that yadif in send_field mode still uses information from other fields to calculate the missing data. it's not any lower quality than send_frame mode (although the fact that it alternates which field is being interpolated can cause some annoying "jiggling" artifacts in send_field mode)

15:24 <kepstin> it's almost always better to use bwdif instead of yadif; not really any slower, and it usually has less artifacts.

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