#archiveteam-bs 2019-02-04,Mon

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00:23 🔗 JAA hook54321: Wrote a little Python script to extract the JPEGs from the file, then I can use ffmpeg to make a video file from that.
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01:24 🔗 JAA hook54321: By the way, I found the webcam again, it moved to http://alatsaeroclub.ddns.net:85/mjpg/video.mjpg
01:25 🔗 JAA Here's my recording: https://archive.org/details/87.111.199.123_85_mjpg_video.mjpg_fragment_20171029
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01:40 🔗 JAA Looks like IA managed to convert the M-JPEG to MP4, but the framerate's wrong.
01:41 🔗 JAA I'm glad that's the case, because otherwise everything I just did would've been completely unnecessary. :-P
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01:52 🔗 Fusl problem is, MJPEG does not have a framerate or anything
01:52 🔗 Fusl it's essentially just a bunch of JPEG images layered after another
01:52 🔗 Fusl perfect for cheap webcam streams that capture in JPEG format
01:53 🔗 Fusl if you wanted to convert it with ffmpeg to mp4, you'd need to specify a fixed framerate
01:53 🔗 Fusl but even that is wrong
01:53 🔗 Fusl MJPEG "framerate" is defined by when the client receives the next JPEG frame
01:54 🔗 Fusl so you'd need to have the timing information when exactly each byte or "chunk" in that stream arrived on the client side to be able to reconstruct it with a variable framerate into MP4 or similar
01:54 🔗 JAA Yeah, right.
01:55 🔗 Fusl that's also so cheap about it. if the CPU on that webcam is struggling, it can't provide the frames fast enough for something like MP4 which AFAIK only supports constant framerate
01:55 🔗 JAA In this case, I knew how long the recording was, so it was easy enough to calculate the framerate.
01:55 🔗 Fusl yeah
01:55 🔗 JAA But that's of course an "average" framerate, not the true timing information.
01:56 🔗 Fusl mostly, MJPEG also have a constant framerate because they get sent out in a specific interval
01:56 🔗 Fusl but when the cpu struggles, it would just drop those frames
01:56 🔗 Fusl and you wouldn't even notice that in the resulting MJPEG file without timing information
01:56 🔗 Fusl yep
01:56 🔗 JAA There's a timestamp in the video, so yeah, in this case it is possible to notice that.
01:57 🔗 JAA And the framerate does seem to vary, being more like 6.4 fps for the first few seconds compared to 5.4 over the whole segment. But anyway, average framerate is good enough.
01:57 🔗 Fusl right, you could probably use that to do some post transcoding inspection and see if the time happens to jump unnaturally somewhere and then just split that video up at that point and insert some duplicate frames there
01:57 🔗 JAA Certainly possible, and certainly not something I'll want to do. :-P
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02:26 🔗 JAA hook54321: And my partial recording of the Lunduke-a-thon is uploading to https://archive.org/details/24-hour_lunduke-a-thon_20171002_partial now.
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03:01 🔗 hook54321 JAA: thanks
03:02 🔗 hook54321 Fusl: probably good enough for this case, could theoretically be done though.
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05:11 🔗 marked benjins: recent versions of wget has decompression support built in (but not wget-lua)
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