Canon M3 CHDK HDMI Output Controls

premieregal

« on: 10 / July / 2018, 14:43:49 »

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Hello! I've found a CHDK by rawopint v0.25 for M3. Thanks for that.
Currently, I'm trying to figure out if there is a hack out there to remove the HDMI output overlays.

I recently did a live-stream test with my Canon EOS M3, using a direct HDMI out to my el gato cam link to do a HD live-stream. The image looked great, but it had the record, MF and exposure overlays on the video during the entire stream (see the screenshot).

I looked into it and there is no way to turn off these HDMI outputs from the menu. I'm here to see if there are any hacks in the works or if I can be of assistance to help test.

Thanks!

Screen Shot 2018-07-10 at 5.40.15 PM.png (421.75 kB, 689x469 - viewed 384 times.)

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reyalp

12537

Re: Canon M3 CHDK HDMI Output Controls

« Reply #1 on: 10 / July / 2018, 16:05:56 »

There's currently no CHDK way to do this. AFAIK no CHDK cameras other than the EOS Ms support HDMI out while shooting.

Using Xtensa side stuff or hacking mzrm communication to disable the OSD completely might be possible:
https://chdk.setepontos.com/index.php?topic=12788.110
If possible, this would disable both on the real camera display and HDMI, if it worked.

CHDK could be used to erase the canon elements but it would flicker a lot.

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Don't forget what the H stands for.

premieregal

Re: Canon M3 CHDK HDMI Output Controls

« Reply #2 on: 10 / July / 2018, 16:19:52 »

Thanks. I think I'll look into an alternate DSLR camera for HD live-streaming.

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srsa_4c

4217

Re: Canon M3 CHDK HDMI Output Controls

« Reply #3 on: 10 / July / 2018, 16:31:56 »

Quote from: reyalp on 10 / July / 2018, 16:05:56

Using Xtensa side stuff or hacking mzrm communication to disable the OSD completely might be possible

There is another method:
a full-screen blank (Canon) dialog does appear to cover all Canon overlay that's on the screen during recording.
The method would work like this:
When a movie recording starts we launch a full-screen Canon dialog and immediately erase the whole screen to make the overlay disappear.
The presence of the dialog does not disable the movie button, so the recording can be stopped the usual way. When recording stops, we remove the full-screen dialog which makes the Canon overlay reappear.
Caveats:
- only tried this on my M10
- this won't disable the LOW BAT warning, so either a well charged battery or external power supply is needed

edit:
Turns out, this "great" idea doesn't work while recording - the black dialog is being redrawn constantly. That leaves the Xtensa hack as the only known way...

edit2:
Done, although not official (yet): https://chdk.setepontos.com/index.php?topic=13489.0

« Last Edit: 15 / July / 2018, 07:29:26 by srsa_4c »

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Menu jumping/flickering on M10?