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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<Schrostfutz> Hi, I have some raw video streams as files (e.g. H264). One of my applications refuses to work with these unless in a container, how can I put them into e.g. mkv without the stream itself being changed?
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<furq> probably just use mkvmerge
<Schrostfutz> furq: I'll have a look at that, thanks
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<furq> `ffmpeg -framerate 25 -i foo.264 -c copy bar.mkv` should work in theory but there's a longstanding bug
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<shibboleth> what? won't it have to re-enc to alter framerate?
<furq> raw streams don't have a framerate
<furq> you can write whatever timestamps you want when you mux them
<shibboleth> so raw ts, not from h264/mp4 cointainer
<shibboleth> container
<furq> even if it's in a container you can rewrite the timestamps
<furq> -bsf:v setts and most standlone muxers will have an option for it
<furq> mkvmerge and l-smash can do that
<shibboleth> til
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<noobaroo> A long time ago, i used a command to see if moov was at the end of mp4 files, the output looked similar to `mediainfo`. Now im trying to figure out what it was and all i see on the internet is `ffmpeg -v trace | grep moov`
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<noobaroo> Does anyone know what the command I used ~2-3 years ago might have been ? Its on Linux and i was probably using Arch Linux at the time and I dont think I had to compile anything
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<furq> noobaroo: https://clbin.com/T9NHi is what i use
<furq> i guess ffmpeg -v trace -i "$1" -f null - 2>&1 would work instead of boxdumper
<furq> probably -t 1 as well so you don't decode the whole thing
<furq> but boxdumper is the tool for the job
<furq> nvm ffmpeg doesn't print the mdat header
<furq> ignore that i was piping it to grep moov
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<noobaroo> thanks furq. no idea what it was that i could have been using ?
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<noobaroo> also is there a way to tell if a video with aac was made with fdk or not ? other than ffprobe
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<noobaroo> BTW the tool was nice that i used to use, it was kind of like ffmpeg -v trace, like it showed the mdat and moov positions in the order it read them and any and all valuable metadata-like information, but it didnt show byte offsets or hexadecimal and wasnt overly verbose, very human readable
<furq> maybe atomicparsley or mp4box
<noobaroo> It was in a style a lot like mediainfo, im wondering, it might have actually been mediainfo with some sort of flag like mediainfo -v file.mp4
<noobaroo> Maybe mp4box, i never heard of atomicparsley
<furq> and nothing can reliably tell you what aac encoder was used
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<furq> unless it's from ffmpeg and it's written in a tag
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<noobaroo> I think it is created with ffmpeg because encoder is Lavc
<furq> if you're just looking for that then lots of things
<furq> more or less anything that displays metadata for that container
<noobaroo> mediainfo says 'codec id: mp4a-40-2'
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<noobaroo> any chance that could be encoder specific ?
<noobaroo> Um yeah also furq, yesterday I tried to set hflip with bsf:v h264_metadata and its weird because there were no errors so im pretty sure i did it right, but it had no effect on the video, i tried to do it to h264 stream even, and mkv and mp4, all had no effect
<noobaroo> And when i tried different things it gave errors and failed, so i think i did my part right
<furq> did you try playing it with swdec
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<noobaroo> No, i have to do that ?
<furq> maybe
<furq> a lot of hwdec ignores top and left cropping flags
<furq> so it wouldn't surprise me if this wasn't implemented to spec either
<noobaroo> Oh okay, well im glad rotation works then. Its a shame hflip doesnt but thats not as big of a deal. Not nearly as visually obstructive
<noobaroo> Im gonna go watch Family Guy, bye
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<BrunoTheDwarf> Marth64, aaabbb just to give an update to both of you, I ended up going with dovi_tool to remove the (dolbyvision) sidedata from the video files I am re-encoding with ffmpeg
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<noobaroo> JEEB i just saw some guy named @Jeeb this 2012 forum, is this you? https://forum.doom9.org/showthread.php?t=166802
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<furq> yes
<galad> usually rotation or flip is set at the container level
<galad> maybe only rotation
<Marth64> BrunoTheDwarf: i will try it some time and understand it better it has been a while
<Marth64> sorry it didnt work
<noobaroo> galad theres tons of input boxes for orientation and projection and stuff, but they are in a mathemetical format, not noob(aroo)friendly, like pitch and yaw, i think they want decimal point values and stuff
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<noobaroo> meant to say in mkvtoolnix-gui
<noobaroo> anyone know how to do anything here?
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<aaabbb> noobaroo: why do you want to use mkvtools for that?
<aaabbb> by mathematical format do you mean radians?
<furq> the projection stuff is for 3d video
<furq> nvm apparently ProjectionPoseRoll works with ProjectionType=rectangular
<furq> but i would be shocked if whatever you're targeting actually supports it
<furq> that one just takes degrees so you can try it i guess
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<screwface> is anyone here a member of the ffmpeg discord server?
<another|> what discord server?
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<aaabbb> using the native aac encoder is the twoloop quantizer still better than the fast quantizer for 64k mono?
<aaabbb> i heard somewhere that the fast quantizer is actually better at some bitrate but i forget if it's a high or low one, or if that's even true
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<KillerWasp> hello, how to capture only one window with ffmpeg?
<KillerWasp> i'm try find about xcomposite, but don't exist any information.
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<alguien> Hey guys. Is this fake blur in this shot with the screaming girl? https://youtu.be/Twn_4AW0M6U?t=83 And how can I tell?
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<DeHackEd> definitely the wrong channel for that
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<KillerWasp> click here! it's amazing!! ===> https://uglymalware.com/
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<alguien> DeHackEd, i figured some of you may do vfx. Couldn't find a better channel to ask on libera. Though a person did suggest #kdenlive when I asked in #libera
<KillerWasp> hola alguien , como estas? Eres un bot?
<alguien> no, tienes un sombrero negro?
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<KillerWasp> alguien: no, pero tengo un par de antenas, cuernos, y orejas palmeadas, eso cuenta como sombrero?
<KillerWasp> es "ruffs" o "webs" en ingles, no hay traduccion en castellano. :/
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<jafa> seeing an odd problem (ffmpeg cli),,, trying to transcode a source with video + two audio tracks, the first is 6ch and the second is 2ch. If I explicitly specify -ac:1 6 -ac:2 2 it works. If I leave this out ffmpeg reports 6ch and 2ch as the output formats but the first audio track is 2ch with no audio
<jafa> I would like ffmpeg to autodetect matching the source so it will work with different content
<jafa> and it does seem to auto detect ok because it reports output stream 1 as configured for 6ch and output stream 2 as configured for 2ch
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<jafa> ffmpeg reports both as 2ch... stream 1 is silent, stream 2 works
<noobaroo> furq the ProjectionPoseRoll + ProjectionType=rectangular just spins the video like a pinwheel or clock, i think it might actually be the same as exiftool rotation=90,180,270 etc
<noobaroo> When i try to use the h264_metadata hflip setting, with hwdec there are no changes and no errors, and with sw it says ffmpeg errors "Late SEI is not implemented. Update your FFmpeg version to the newest one from Git"
<jafa> and forcing the channel count always works - force both to 6ch works, force both to 2ch works, or force 6ch and 2ch respectively works
<noobaroo> in the ffmpeg help page at https://www.ffmpeg.org/ffmpeg-bitstream-filters.html#h264_005fmetadata it says "See H.264 section D.1.27 and D.2.27" but the only H264 specifications I found is a PDF and it only goes up to D.1.20, i think its from 2003 so thats probably why
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