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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<cproo12>
anyone active and willing to help with an OPUS conversion issue?
<cproo12>
attempting to convert AAC to OPUS and getting popping sounds in the audio stream. File is an MP4 with 1 video stream, 2 audio streams. My goal is to leave video untouched, and convert the audio streams from AAC to OPUS. It works right not but there is a constant popping sound in the audio, almost like it is clipping. Any help is appreciated.
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<ManDay2>
I gathered from a SO reply, that there are generic output pads beside "in", "v" for video and "0" nothing (? I assume) - where are these documented please?
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<ManDay2>
I got that '0' part wrong, it's the file index
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<ManDay2>
How do you deal with the MM:SS.m... syntax in filter graphs? trim=12:13:14 ?
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<furq>
just use seconds
<furq>
i don't even know how you escape those colons
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<ManDay2>
i got the times from mpv in the MM:SS.m... format though :-(
<ManDay2>
(read them off the cli)
<ManDay2>
time to do some higher maths, i guess
<furq>
some combination of ' and \ should work
<furq>
but i couldn't tell you which
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<ManDay2>
wow, wtf, 15 Gigabytes are not enough for this commandline on a 3 minutes screencap:
<ManDay2>
i suppose it's because it's all raw internally?
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<ManDay2>
anything i can do to restructure this to run on 15G ?
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<intrac>
does ffmpeg have a way to blend an arbitrary number of frames? tblend seems to do a maximum of 2
<intrac>
I thought I remember reading about an alternative filter that would allow arbitrary numbers
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<intrac>
ah, maybe tmix
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<ManDay2>
I'm trying to visualize audio seeking with 'color=s=2x100:c=red:d=14.318[col];[0:a]showwavespic=s=1600x100:scale=log,framerate[main],[main][col]overlay=x=1600*t/14.318[out]' -map '[out]' on an audio file, which works kind of all right but the cursor does not seem to move entirely smoothly and it a sort of jerky fashion. Does anyone have an idea what could be the issue?
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<intrac>
ManDay2: that could be many things. playback on computers is notorious for not being completely smooth. also, if your video fps doesn't match the display, that can cause stuttering
<intrac>
eg 25fps video but 60Hz display
<intrac>
I would step through the video one frame at a time, to try and work out if it's actually irregular with the video itself or something to do with the playback (OS or media player)
<ManDay2>
yeah I tried to frame-step it with mpv and while it kind of looks allright, my perceiption while it plays still says it's irregular. i trust my perceiption more; now it's just hard to say whether I imagine things, the playback is the problem, or the video. but i trust your judgement that the video should be alright
<intrac>
ManDay2: try at 1/4 or 1/8 speed and see if things feel more regular (even if the framerate is low)
<intrac>
it should be possible to see if the movement has an even quality to it
<intrac>
you could always upload a clip somewhere and someone here could suggest where the issue might be
<furq>
1600*t/14.318 won't give a regular cadence
<furq>
not sure if that would be noticeable
<ManDay2>
furq: what do you mean?
<furq>
for 25fps that will either move four or five pixels per frame
<intrac>
also, the full command would help. eg, are you defaulting to ffmpeg's output fps (which I think is still 25?) or setting something else
<ManDay2>
the `framerate` filter would produce 50 if I understood correctly
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<intrac>
oh, I'm not familiar with the framerate filter
<ManDay2>
without it, I got 1 fps or something like that because apparently overlay seems to figure fps=1 is the best thing when the showwavespic is on the primary pad
<furq>
well showwavespic is only one frame
<furq>
it would probably make more sense to use fps=50 but i guess it makes no difference
<ManDay2>
yeah. somehow it got promoted to 1 fps tho :D
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<ManDay2>
do I not need something like setpts for audio when I trim and reconcat audio? because i needed it for video...
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<ManDay2>
Re the visualization, there is definitely a noticable offset between the waveform and the audio though
<ManDay2>
it's as bad sa 0.3 seconds on a 15 seconds file :-S
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<dv_>
hi
<dv_>
has the matroska menu support ever gone anywhere?
<dv_>
I have a bunch of old DVDs here that are starting to exhibit playback problems, so I am ripping them as an iso. but I then have to stick with the old mpeg2 encoding.
<dv_>
one matroska file, with video transcoded to AV1 or h265, that would be great.
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<LStation>
is there a way to force a colorspace on decode? ffmpeg -hide_banner -y -loglevel verbose -f lavfi -i color=#003000,format=bgra -t 1 -c:v mjpeg_qsv qsv.avi , will say it's fmt:bgra csp:gbr however when read back with ffmpeg -hide_banner -loglevel verbose -i qsv.avi -f null - , bt470bg will be the csp. I've tried using other containers like mkv, or decoder="mjpeg_qsv" (avisynth, LSMASH) with undesirable results
<znf>
BtbN, there is still no vaapi support on your Windows builds, correct?
<BtbN>
There is, but it's bloody useless
<znf>
ffplay complains about "Derive vaapi from vulkan not supported." for me
<znf>
granted, apparently nothing plays with ffplay and -hwaccel lol