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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<BitcoinOnly>
hello ffmpeg people
<BitcoinOnly>
i am trying to convert a 200mb HD fish mp4 into a gif for my desktop, but it maxes my memory and crashes my computer when i try
<BitcoinOnly>
i can send you my code if you want
<BitcoinOnly>
i tried ulimit 8000000 and thread_queue-size 512, -threads 4 but that didnt help
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<nasso>
a 200mb hd mp4 would be enormous as a gif idk if there's much you can do other than trying to reduce the resolution, framerate or # of colors
<nasso>
or maybe using a LOT of swap
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<linux-wangs>
I have some MP4 files that, when played in VLC, either show "foobar" (example) in the title bar or "foobar" as a subtitle (despite having no subtitle track). When opening "Media information", the "general" and "metadata" tabs are all blank. Running `strings file.mp4 | grep foobar` yields no results. I'm curious how does that work?
<CounterPillow>
try running ffprobe on it
<linux-wangs>
CounterPillow, no mention of "foobar" anywhere in the command output
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<xx>
has anyone made a "plugin" for https://dangerzone.rocks/ yet? I'm thinking of adding something like that, which takes input audio/video files, puts them in a sandbox/container/virtual machine, runs ffmpeg to covert it to "the most safe format", and then takes it out of the sandbox/container/virtual machine
<xx>
(and then deletes the sandbox/container/virtualmachine)
<xx>
theoretically, no exploit should survive the conversion
<xx>
loss of audio/video quality is of course expected
<welder>
xx: Why not just extract the streams with -c copy?
<xx>
welder: because the streams could have the exploit in them
<xx>
better to convert stuff
<xx>
basically the safest thing is to destroy information through lossy conversion because that likely makes any exploit not work either anymore
<linux-wangs>
use RDP billed by the minute to watch your CP and fuggedaboutit
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<aaabbb>
xx: "most safe format" meaning one that isn't likely to have an additional vuln in decoders?
<xx>
I don't know yet, probably the most well-maintained container format and codecs in ffmpeg
<xx>
but I don't know which ones those are
<aaabbb>
the h264 decoder is pretty solid i imagine
<xx>
the alternative is to pick the simplest possible container format and codecs, hoping that they are so simple that they are not buggy
<aaabbb>
for containers, maybe matroska? it is very simple and many decoders are written in rust iirc, i think firefox uses a rust parser for mkv
<aaabbb>
you could have the "untrusted" ffmpeg just decode to a raw format and then a non-untrusted ffmpeg take that via stdin and encode to anything, assuming no worries about a vuln in the encoding process
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<xx>
I'll have to look into all this, they already do similar things for pdf and images
<aaabbb>
that site looks to turn media into pdfs, how would you turn a video into a pdf?
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<kepstin>
simple, make a document where each page is one frame of video ;)
<kepstin>
(iirc pdfs actually do support embedded video and sound media, but i don't know the details of how it works)
<aaabbb>
new container to replace all other containers. nut? obsolete. matroska? obsolte. mp4? obsolete. all hail pdf, the container to end all containers!
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<AMM>
pdf being used as the secure container for safely decoded files is extremely funny to me
<aaabbb>
it is lmao, it's the worst container i can imagine for that
<AMM>
like yeah if you have complete control over the formation of the pdf then it's probably safe, but it's like using gasoline to put out a fire
<aaabbb>
but if you're converting from a format whose decoder has vulns, it means the attacker also has control over the process that creates the pdfs presumabyl
<aaabbb>
unless there is some intermediate
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