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Hi there,

I am using the Pre-recording (half-shutter) function to digitalize Super 8 films. A projector is sending a signal to the camera for each frame allowing me to record Raw videos fully synchronized.

However I am asking myself how this function works exactly.

The projector is running at 8 fps. The timing of the capture start to be accurate when the fps of the camera is a least double. Around 18fps is fine. Under this value, the timing is bad.

I don't really understand why. Does it mean that the function only "check" if the half-shutter is pressed at the frequency of the fps set on the camera?

In my case I though that the fps would not play any role as the actual recording speed is set by the projector.

yes I know recording 4K @ 18fps would be too much for the cam.
I actually only need 4K @ 6fps but with the cam checking for the half-shutter signal 18 times/sec or more, this a really specific and weird need I agree

yes, it maybe sounds confusing....

I am using my Eos-m with the rec_trigger function. A Super-8 projector is sending a half-shutter signal to the camera for each frame of the film, this allows the cam to record in sync with the projector.
I record at around 6fps, this is the speed of the projector.

But it seems that the frequency the camera is "checking" for the half-shutter signal is determinate by the fps of the preset (maybe related to the "Liveview clock" from what I read). It only check 5 times a second if the cam is set at 5fps, which give bad timing in the synchronisation. If a use a preset at 18fps or 24fps, the sync is perfect.

thanks, I already played on those reg directly on the cam. The fps increased but the preview and record went corrupted. 
I need to record at around 6fps but somehow need the "Liveview clock" to be faster. I will keep searching and trying

Yes I tried to have a look at the code but I couldn't understand where and how the presets are made...I was searching in crop_rec.c

Is there some guidelines somewhere you could recommand?

Would it be be technically possible to enable 18 or 24fps for the 4K preset?

The goal wouldn't be to record at this fps but to have a more precise timing for recording single frames with the Rec-trigger function.

Hi there,

I am trying to understand the relationship between the different presets and the actual fps indicated in the "fps override" menu (which is Off). For example, with the 3k mode, i can see an actual fps of 18fps, switching to the 4k, i see 5fps.

I am using my Eos-m with the rec_trigger function. A Super-8 projector is sending a half-shutter signal for each frame to allow the cam to record in sync. So the fps is actually set externally by the projector, I record around 6fps.

From my readings, I understood that the camera is recording a frame that was already in the buffer when it receive a half-shutter signal. But it seems that the fps is also playing a role (related to the fps of the LiveView?), the higher the fps, the more accurate is the timing of the frame captured. Could someone tell me if it's correct ?

This would explain why I have have some synchronisation problems when I switch to the 4k preset and that it's working fine with the 3k. I guess 4K continuous @6fps should be ok?

Hi there, so much work done in the last weeks, that's great, thanks !

Does the 4K preset react differently than the other ones when working with the half-shutter trigger ?

I'm using the Half-shutter trigger to records MLVs, the trigger is sent from a Super-8 projector (Telecine), it's working well with the 2.5K mode and the 5K anamophic too but the 4k mode is not capturing the pictures in sync. Slowing down the projector at around 6fps and recording 10bits doesn't help.

Not sure that it's simply too much data to write or if there is something I didn't understand with this preset...

I finally understood didn't see the git after jip-hop... thanks

[bitbucket.org/Dannephoto/magic-lantern magic-lantern_dannephoto]

I first downloaded  your repository from : bitbucket.org/Dannephoto/magic-lantern magic-lantern_dannephoto (this gave me this unstable Build without modification )

and then downloaded from bitbucket.org/Dannephoto/magic-lantern_jip-hop  (the one I modified from and that seems to work well)

or maybe you mean you did some changes in the last hours and I should download  and modify again ?

[https://www.magiclantern.fm/forum/index.php?topic=21882.0]

ok, I think this is what I did ( I basically followed those instructions : https://www.magiclantern.fm/forum/index.php?topic=21882.0 )

[https://bitbucket.org/Dannephoto/magic-lantern_jip_hop_git/src/master/]

Not sure to understand your last message...
I modified from : https://bitbucket.org/Dannephoto/magic-lantern_jip_hop_git/src/master/
Is there a newer code I should download from another host?

[magic-lantern_jip-hop]

Yes, correct branch. If you don´t modify, what do you get? ALso important with this source. magic-lantern_jip-hop.
Problematic also atm that I can´t post changes to bitbucket anymore. Vacuum period.

Modifications are done, it's working, 1 frame/half-shutter, thanks for your help ! I now have a 5k Telecine

[EDMAC Timeout]

Without modification, I have more or less the same things but organised differently in the menu. Also, the preview doesn't seems to be really stable and I couldn't get the same resolution with 5K anamorphic as I had with the version posted here. When Recording I have an error  EDMAC Timeout.

Not sure to understand with magic_lantern_jip-hop , is that another path for the branch or a module on top of the build? (trying to learn, sorry if absolute beginner question)

Edit : I think I got it, I should download your repository from : bitbucket.org/Dannephoto/magic-lantern_jip-hop and not bitbucket.org/Dannephoto/magic-lantern magic-lantern_dannephoto  ?

[crop_rec_4k_mlv_snd_raw_only]

After some hours of struggling, I managed to compile something using the Compiler.app on mac  , at least I think I did

When compiled (without any modification for now), I have something different from the last version posted here : no one touch Presets, Menus are not the same, recording seems to be unstable....

I am wondering if I am working on the right branch, crop_rec_4k_mlv_snd_raw_only is correct?

Thanks a lot !

I have no idea how to do it but I will try to learn

Thanks for your fast answer 

I just did a test, it's indeed working with the SET button, only one frame is recorded.

The problem is that I modified the hardware of my EOS-M to have a Remote Shutter cord (i have soldered wires to the shutter button) so that I can connect a trigger to the camera. The trigger is sent by a Super 8 projector and allows the cam to record synchronized with the projector (Telecine).

Do you know if any setting would allow me to keep using the Half-Shutter for this purpose?

[magiclantern-raw_video_10bit_12bit.2019Mar24.EOSM202]

Hi there,

I just tested this new experimental build, it looks fantastic, thanks for this work !

I have one question concerning the rec-trigger function : when set to "Half-shutter : pre only" , I have 2 frames recorded per half-shutter

I was using before the build : magiclantern-raw_video_10bit_12bit.2019Mar24.EOSM202 which give me 1 frame per half-shutter with the same settings.
I also tested crop_rec_4k_mlv_snd_isogain_1x3_presets_2019Jul24.EOSM202 which give 1 frame too.

Did something change in the Rec-Trigger function? I couldn't find any setting to go back to only 1 frame recorded

Hi there,

Does anyone know if any version of ML allows to have the Liveview working with accurate framing while shooting RAW video on the 70D? Even in grayscale?
I have tried many different Builds without success until now, the liveview is always frozen if in 'framing' mode as soon as the record start

Hi there,

I am new here. I digitize old Super 8 in Raw format and started to use MLV App to process the files, the software is fantastic, congratulations for this work !

Something even more fantastic would be to have an option to invert the picture "Left/Right". (Super 8  need to be inverted "Upside Down" and "Left-Right" if captured without projection). A crop option would be great as well.

I am not sure this is the right place for requests, please let me know if there is dedicated place for it that I didn't found

[Rec trigger]

Hi there,

It's my first post here, I have been reading and researching a lot on this forum to achieve my goal but I am stuck for now and may need some help.

I am trying to digitalize Super 8 film using the Eos-m. I have a projector that can run at different speeds, including low speeds (around 7fps). There is a hall sensor mounted in it that could send a trigger signal to the camera for each picture running in the projector.

I want to have the camera recording a single MLV file with each pictures triggered by the projector.

I installed the crop_rec_4k build for Eos-m. By setting the Rec trigger to Half-shut:1frame and activating Silent Picture / Simple, I can start a record by pressing the Rec button and then each frame is recorder by pressing the Half-Shutter button. This is the best way I found to have decent FPS.

This is really promising but I now need to trigger the shutter with the Audi RemoteShot as the Eos-m doesn't have a remote port. I couldn't find a way to do it after trying lots of different settings and builds. Sending a signal to the mic input only start the record but the picture counter stay at zero. Only pressing the Shutter button physically seems to be able to capture the single frames of the video.

Does someone know any settings or experimental build that I missed that could solve my problem?

Many thanks in advance

some readings :

I was inspired by the project of Miket :
https://www.magiclantern.fm/forum/index.php?topic=19300.msg214330#msg214330 
he used a 5dMarkIII which have a remote port.

Another project :

https://www.magiclantern.fm/forum/index.php?topic=19005.0
This is with the Eos-m and silent mode but using the FullRes option which can be triggered by the AudioRemoteShot but is extremely slow.