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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<gur_2>
I want to overlay images 1:1 onto video frames. I run 'ffmpeg -i video.ts -i images-%06d.png -filter_complex overlay out.ts' but the png sequence is interpreted and applied at a different frame rate (25 fps) from the video (30 fps). I've tried -r 30 prior to the second -i but it doesn't seem to help.
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<gur_2>
I was judging results by the status provided on the input streams, which is unaffected. But the output seems to be affected. I thought I had checked the output before, but perhaps was mistaken.
<BtbN>
-framerate, not -r
<BtbN>
I think -r will take the 25 fps input stream, and try to fudge the timestamps or something
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<gur_2>
Thanks, I'll try that.
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<gur_2>
BtbN: result was byte-for-byte identical using -r 30 and -framerate 30
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<olndrxyz>
Hi, is -b:v 0 the correct way for CRF encoding in VP8?
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<BtbN>
I don't think libvpx has crf
<furq>
yes but it seems like it's broken right now
<furq>
vpxenc itself calls it cq-level but ffmpeg calls it crf
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<tM^caoX>
Still no ffmpeg-way of settin' the JPEG (metadata) orientation tag? (landscape or portrait usually) Been diggin' thru dozens of forum threads, mostly old ones tellin' that best practise is to use exiftool or exiftran before ffmpeg.. I'm thinkin' it should be possible to use -metadata with ffmpeg and make it do the same thing as exiftool/exiftran? =o
<olndrxyz>
furq: I'm trying to convert a video encoded with AVC (9859kb/s, 1080p, 30fps, 7min, 550MB) to VP8/webm. If I set -b:v 0 with a low -crf value (eg:10), the output is always of bad quality with a bitrate of 500-600kb/s.
<furq>
22:36:56 ( furq) so i guess set some very high value for -b:v and then set -crf
<olndrxyz>
I don't understand why the quality/file size degrades so much with those settings
<furq>
i just linked the bug report
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<olndrxyz>
furq: Yes, I tried that and I get a good output when I set a bitrate of 1-2 mbps but the vp9 guide suggests to set b:v 0 and let -crf handle the quality.