MJPEG 1080p Timelapse Patch?

C

CColton

Well-known member
I've been told that stable 1080p30 has never been achieved for the MJPEG mode of the GH1. I've also been told that the frame rate can be changed to very low rates like 2fps for timelapses. If you lower the frame rate that far, could the frame size be scaled up to 1920x1080 and still be stabile? It seems that if there's a theoretical maximum stabile bitrate, decreasing the frame rate would lower the bitrate, and then increasing the frame size could use the extra room left by the absent frames per second. Just an idea. I could also just know nothing about codecs and be conjecturing the impossible.

And hey, if we went really crazy with this, how about 4k timelapses? :P Just kidding, even I know that that's a little too ambitious.

Ideas?
 
I would test this but I don't understand the E1-9 tables in Ptool and how to set them up correctly...
 
It's possible that a low MJPEG frame rate might reduce the likelihood of high bitrate failures. However, it's not clear whether the camera drops unneeded frames before or after they are encoded into MJPEG format. The quickest way to find out is to use the Reliable In-Camera Playback Patch, with the MJPEG frame size to 1920x1080 and the frame rate to 3fps. If that doesn't work reliably, then there's little chance that an FHD frame size can be stabilized.
 
lpowell said:
It's possible that a low MJPEG frame rate might reduce the likelihood of high bitrate failures. However, it's not clear whether the camera drops unneeded frames before or after they are encoded into MJPEG format. The quickest way to find out is to use the Reliable In-Camera Playback Patch, with the MJPEG frame size to 1920x1080 and the frame rate to 3fps. If that doesn't work reliably, then there's little chance that an FHD frame size can be stabilized.
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I tried using the Blackout-Powell patch and changed the frame size to 1920x1080, frame rate to 2 fps, with 4:2:2 subsampling and didn't get any crashes, but the compression artifacts were horrible. I should probably just get a timer remote and go with JPEG, not MJPEG :P
 
Also, lpowell, is it true that the MJPEG E1 table is the one that matters the most, and the rest are just something the camera can fall back on?
 
Tried it, it still looks quite soft. It has about the resolution (not pixels, resolving power) of a 720p image scaled up to 1080p.
 
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