Author Topic: Magic Lantern Cinema Camera - Dual ISO without aliasing & without quality loss!  (Read 22851 times)

Danne

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Sorry, I still can't follow. You vaguely describe what you do and seemingly mix builds. One test says frozen other corruption.
If I undeestand clearly what you do maybe I can help.
Advice. Search the web for how to post most useful info reporting bugs and how to do helpful testing.

IDA_ML

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Thank you! The main problem of this build (20Jul2019) is frozen preview.

I will try to explain this preview freezing issue in some more detail: 

It happens when focusing.  Unfortunately, focusing while in video mode is not reliable enough. To achieve precise focus (absolutely important !!!), I switch to photo mode.  This allows me to get a very detailed 10x magnification and I can focus precisely either manually or by pressing the back button.  Once I have achieved perfect focus, I switch back to video mode to start recording and here is where the trouble happens.  Preview changes to stretched and freezes upon pressing the record button.  The only way out of this situation is to turn camera off and on again.  This wastes a lot of time and the moment is gone.

Another bug:
========

Camera freezes badly when trying to switch to Dual ISO while in video mode.  Not even a battery pull helps.  The only possibility to activate Dual ISO is to turn camera off, switch to photo mode, turn it on again, activate Dual ISO, turn it off again, switch to video mode, turn it on again and then you can start recording in Dual ISO.   

Both of the above instabilities are well reproducible.

Danne

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New builds 5D3:
https://www.magiclantern.fm/forum/index.php?topic=23041.msg216899#msg216899

- Reduces 1x3 preset fps to 17fps to get rid of compression errors.
Can´t reproduce any freezes or other instabilities described.
If testing this build do not mix modules from other builds.



I will try to explain this preview freezing issue in some more detail: 

It happens when focusing.  Unfortunately, focusing while in video mode is not reliable enough. To achieve precise focus (absolutely important !!!), I switch to photo mode.  This allows me to get a very detailed 10x magnification and I can focus precisely either manually or by pressing the back button.  Once I have achieved perfect focus, I switch back to video mode to start recording and here is where the trouble happens.  Preview changes to stretched and freezes upon pressing the record button.  The only way out of this situation is to turn camera off and on again.  This wastes a lot of time and the moment is gone.

Another bug:
========

Camera freezes badly when trying to switch to Dual ISO while in video mode.  Not even a battery pull helps.  The only possibility to activate Dual ISO is to turn camera off, switch to photo mode, turn it on again, activate Dual ISO, turn it off again, switch to video mode, turn it on again and then you can start recording in Dual ISO.   

Both of the above instabilities are well reproducible.
I cannot reproduce any of above described issues. Are you sure you aren´t thinking of your 100D?
- AF works while recording(but I would never use it. Way to slow)
- No freezes at all doing whatever with dualiso module

Instead of arguing please upload a screen recording of your exact steps reproducing your issues. Saves me a lot of testing time.
I would advice you to use the x10 focus aid instead of going in and out of photo mode using back focus button etc.

IDA_ML

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Danne,

I experienced the described issues all the time with the July 20-th build.  As described, they are clearly reproducible here, at least most of the time.  I am not arguing and not thinking of the 100D.  Nor do I mix modules.  I used the build as downloaded from your download area.  Will test your today's build as soon as the 5D3 is available again. 

Danne

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Screenrecordings of exact steps needed. Not old tests reported in a complete new context. Confusing.

IDA_ML

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I can now confirm that Danne's latest 5D3 build (Oct. 13-th) works very well with Dual ISO.  Camera remains stable when switching Dual ISO on and off in video mode. 

@Danne
It would be very helpful if you activate also the "Slow shutter" option, (currently working only on the EOS-M and the 100D).  This function is of crucial importance to silky smooth timelapse videos since it allows very low shutter speeds - down to 2,5 s/frame.  Currently, the slowest 5D3 shutter speed is limited to 1/33s.  In view of the beautiful fall colors outside, I am sure that many 5D3 users, willing to create beautiful timelapse videos, will greatly appreciate the Slow shutter function.

Thanks.

Danne

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Slow shutter is applied to presets with reduced fps when enabled. Could be tested by enabling it and 1x3 17fps preset. Shutter shgould be able to go as slow as 17fps. Slow shutter can be reached from the crop mode sub menu.

Correction: Enable "Shutter range" to full range. Slow shutter is only applied to eosm and 100d, different context.

IDA_ML

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Slow shutter is applied to presets with reduced fps when enabled. Could be tested by enabling it and 1x3 17fps preset. Shutter shgould be able to go as slow as 17fps. Slow shutter can be reached from the crop mode sub menu.

Correction: Enable "Shutter range" to full range. Slow shutter is only applied to eosm and 100d, different context.

I am not sure I understand what you are saying.  On the 100D, when I selected 4k/1fps in the Full-Res LV mode, the shutter speed was reduced to 0,8 s. or similar - very close to 1 s.  I was unable to do the same on the 5D3.  It all the time defaults to 1/33 s.  Is it possible to achieve 1 s. shutter speed on the 5D3 and if yes, do I have to use the 1x3 17fps preset for that?  Even if it may be possible to go down to 17 fps as you suggested, this is still too fast.  Something between 5 and 1 fps is needed for Full-res LV and going even further down to 0,4 fps for low-light timelapses would be highly desirable.   

Danne

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What you ask for is already working.
1 - select a preset
2 - enable fps override to whatever
In movie modes generally you can't go below 1/30s but:
3 - set 'Shutter override' to Full range and it will go as slow as fps override is set to.

Don't forget. Canon menu button is your friend so don't forget to push that once or twice.

IDA_ML

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OK,  I understand now.  I was just too scared to touch fps override.
Right now I am at work but have not returned the 5D3 yet.  Good opportunity to test this wonderful feature.  Thanks a lot, Danne!