<BtbN>
In theory, gcc can also compile cuda code to ptx, but you'd need to compile a special gcc for it, since it doesn't support runtime target selection
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<ShaedS>
oks omething isn't right
<ShaedS>
i'm cutting at a specific key fframe, what happens is there's blackness, a single light, a frame of a single light, then frames of two lights going on
<ShaedS>
i am using djv to get the xact time code, the lgiht cuts on at time code :11, i'm cutting at timecode :10 which is milisecond equvilent to .167 miliseconds
<ShaedS>
ffmpeg -i IMG_5763.mov -ss 00:03:42.167 -to 01:12:41 -c:v copy -c:a copy 1-trim.mov and when i open my file, there are frames of blackness, and the first frame I see is two lights being on, instead of one, then two
<ShaedS>
how do I cut to just before the second light coming on?
<beastd>
ShaedS: A simple stream copy cannot be exact if the individual streams are more coarse. Especially common for compressed video streams.
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<peac>
is it possible that a hardware codec (v4lm2m on rpi's bcm2835), which does not support GOP setting (seems to be a bug), is generating h264 keyframes every 60 frames, but sets in the metadata that keyframes should be every 30 seconds, making the playback run at half the speed between keyframes (30 frames for 2 seconds) and jump to the next keyframe
<peac>
every 2 seconds, effectively skipping half of the stream ?
<peac>
and how can i check the difference between the metadata and the data on keyframe frequency ?
<peac>
what are good alternatives to streameye for analysis ?
<peac>
(good as in free beer, supporting linux, complete and good looking)
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<BtbN>
gop length is not something that's communicated in any special way other than an I-Frame appearing
<peac>
then maybe an issue with PTS ?
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<BtbN>
The encoder is probably just busted. The v4l2 encoder stuff is of rather questionable quality in every aspect of it.
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<peac>
i'm just trying to understand exactly what is wrong with this stream
<peac>
can you point out how i can check what's going on with this stream ?
<peac>
i'm stuck with v4l2 and i know the data in the stream is malformed but exploitable, so i need to understand so i can find the best way to exploit it correctly
<peac>
any help, education or pointers would be greatly appreciated. thanks
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<peac>
for debug purposes i've reexposed the broken h264 mpeg-ts stream on http://iostud.io:8090 (can be read with ffplay) and the resulting laggy HLS on http://iostud.io:8060/
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