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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
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JAA |
hook54321: By the way, I found the webcam again, it moved to http://alatsaeroclub.ddns.net:85/mjpg/video.mjpg |
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01:25
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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
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JAA |
Looks like IA managed to convert the M-JPEG to MP4, but the framerate's wrong. |
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01:41
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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
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Fusl |
problem is, MJPEG does not have a framerate or anything |
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01:52
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Fusl |
it's essentially just a bunch of JPEG images layered after another |
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01:52
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Fusl |
perfect for cheap webcam streams that capture in JPEG format |
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01:53
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Fusl |
if you wanted to convert it with ffmpeg to mp4, you'd need to specify a fixed framerate |
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01:53
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Fusl |
but even that is wrong |
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01:53
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Fusl |
MJPEG "framerate" is defined by when the client receives the next JPEG frame |
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01:54
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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 |
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01:54
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JAA |
Yeah, right. |
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01:55
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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 |
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01:55
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JAA |
In this case, I knew how long the recording was, so it was easy enough to calculate the framerate. |
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01:55
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Fusl |
yeah |
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01:55
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JAA |
But that's of course an "average" framerate, not the true timing information. |
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01:56
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Fusl |
mostly, MJPEG also have a constant framerate because they get sent out in a specific interval |
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01:56
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Fusl |
but when the cpu struggles, it would just drop those frames |
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01:56
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Fusl |
and you wouldn't even notice that in the resulting MJPEG file without timing information |
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01:56
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Fusl |
yep |
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01:56
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JAA |
There's a timestamp in the video, so yeah, in this case it is possible to notice that. |
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01:57
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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. |
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01:57
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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 |
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01:57
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JAA |
Certainly possible, and certainly not something I'll want to do. :-P |
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02:26
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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
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hook54321 |
JAA: thanks |
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03:02
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hook54321 |
Fusl: probably good enough for this case, could theoretically be done though. |
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marked |
benjins: recent versions of wget has decompression support built in (but not wget-lua) |
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