GH1 firmware research volunteers required

[Vitaliy Kiselev]

Then... what about MJPEG @ 60fps?

50Mbps? I do not expect to MJPEG encoder and/or SD controller be able to do such work.
But this knowledge answers many stupid questions from Canon and Panasonic owners of why they do not provide 720p24.

May be after long research we could toggle frame combine feature and get 720p25 (out of 720p50) and 720p30 (out of 720p60).
But I don't see this as very useful.

[Park Edwards]

To prove my theory we need to make controlled experiment with shooting
paper with carefully printed fine grid with numbers and camera on tripod.
So we could check if this is true.

This also answers why Canon don't have 720p24.
They can't :-)

Make the chart and I'll shoot away ;)

[Vitaliy Kiselev]

Choose large and one you like:

http://images.google.com/images?um=1..._rfai=&start=0

We need to test in PAL mode (720p,1080p) and NTSC(720p,1080p) mode.
Camera must be tightly fixed as well as target.

[Vitaliy Kiselev]

And here is generator:

http://incompetech.com/graphpaper/plain/

[Isaac_Brody]

No 24P MJPEG? Ah, breaking my heart.

[Vitaliy Kiselev]

No 24P MJPEG? Ah, breaking my heart.

May be 25p later :-)
As 30fps=60fps/2, so 25fps will be just 50fps/2.
But we do not know that much to make it today.

And it looks that we have quite a headroom for FullHD mode.
2752750 pixels vs 2073600, but no width reserve :-)

[John Caballero]

But the Nikon D90 has 24p Mjpeg. How come?

[billy fattey]

And it looks that we have quite a headroom for FullHD mode.
2752750 pixels vs 2073600, but no width reserve :-)

Can you explain what that means in more detail?

[DanDOF]

But the Nikon D90 has 24p Mjpeg. How come?

I'm starting to miss my D90. Relatively small 720/24p files in .mov format... etc.

[JerryB]

Tester13, are you certain that this sensor can not record 24fps at 720p or does this theory need more testing or research? This would certainly be a disapointment if so. Great job on everything else so far though! I hope you keep up the dedicated pace. I'm sure you can see now from the quick fundraising that there are a lot of dedicated and hopeful GH1 filmmakers out there (including myself).

[John Caballero]

I really don't understand how the D90 records 720 MJPEG at 24p and the GH1 wouldn't. Especially with the much better sensor in the GH1.

[Ben_B]

If it's possible to push the motion JPEG to 60p instead of 30p that would be amazing because the 60p can be slow motioned or converted to 24p in post (which is actually pretty easy and can look quite good...certainly better than 30p.)

I realize this means twice the throughput which could mean half the bitrate, but if the bitrate can be increased too then 60p could be an ideal solution.

I get this probably sounds silly to those in the know..I am just operating on the assumption that 60p might be slightly more possible than 24p since things seem capable of 30p.

[spamrakuen]

May be 25p later :-)
As 30fps=60fps/2, so 25fps will be just 50fps/2.
But we do not know that much to make it today.

25fps MJPEG would be nice.

[Isaac_Brody]

Yeah I'd be happy with clean mud free 25P.

[TrueIndigo]

"No width reserve" -- does that mean we could get 2k CinemaScope (2048 x 858) then? Will it possible to custom set the region of interest on the sensor? And would there be a possibility to use a 1:1 pixel window area (no pixel downsampling), useful for C-mount lenses with the smaller image circle?