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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<johnjaye>
on this post it's talking about encoding options for h264. What does this part mean in reference to two-pass encoding? "if output quality from frame to frame is of less importance"
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<kepstin>
on what post? what is being compared to?
<kepstin>
"output quality from frame to frame" is also somewhat subjective
<kepstin>
(and which encoder are you talking about)
<kepstin>
i think that statement is rather misleading, tbh
<kepstin>
with x264, crf and two-pass mode generally provide the most consistent visual quality over the file
<johnjaye>
ok. it seemed confusing to me
<kepstin>
also there's no significant difference between crf mode and 2-pass abr mode in frame-to-frame or scene-to-scene output quality.
<YUiNA>
i thought 2pass was essentially just picking the optimal crf value on pass 1 and using it on pass 2
<YUiNA>
or am i mistaken
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<kepstin>
with x264 specifically, that's approximately what it does yeah
<kepstin>
other encoders work differently
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<johnjaye>
so if i want to target a file size i should do the two pass and specify the target bitrate and it will match crf to it instead of me having to guess it?
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<kepstin>
basically, yeah. the first pass encode collects statistics as it encodes and uses that to calculate a "constant rate factor" that is used as an adjustment to x264's constant-visual-quality per-frame bit allocation so the final result will have the desired average bitrate.
<kepstin>
that's an oversimplified description of course.
<kepstin>
to the best of my understanding, crf is an implementation detail of 2-pass encoding that they figured might also be useful for doing 1-pass encodes too :)
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<Guest71>
Hi all, I have scoured the internet but failed to find a good answer for this. I have a file with a name like myvideo%28abc12%29def.mp4 and I cannot find a way to pass it to ffprobe cli. I have tried escaping the "%" chars with backslashes, double and triple backslashing, but nothing seems to work. If anyone has an idea on how to make this work
<Guest71>
that would be awesome. Thank you!
<cheapie>
Guest71: I don't know what OS you're on, but did you try putting the file name in quotes?
<Guest71>
I am on linux, I tried putting the filename in quotes and double quotes. No luck. The error I see is `[image2 0x59105d577f80] Could find no file with path <mypath> and index in the range 0-4` (it is actually an image, sorry the example filename above is a video, though I doubt it matters)
<kepstin>
it does matter; images use a demuxer that's designed to read a series of files as a video, and the % is used as part of an escape for index numbers in files.
<kepstin>
you can disable this by using the option "-pattern_type none"
<Guest71>
oh my gosh kepstin you are a life saver! I figured there was some escape hatch in ffprobe, but I just could not find this problem documented anywhere. Thank you!
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<johnjaye>
Guest71: you can't rename the file?
<johnjaye>
iirc there is a way to refer to a file by its inode and delete it if it has weird characters you can't type.
<Guest71>
I cannot, and my problem is solved with -pattern_type none. I am going to drop from this chat for now. Thanks y'all
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