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This is really nice, can you describe your postproduction workflow? did you create a 4K timeline and then just stretched it out?

Thank you.

MLV_DUMP all the MLV files to dngs. put them in individual folder (don't put the MLV files in the folder). Drag the folders to After effects. edit the dngs in the pop up RAW Editor. then create sequence for that each clips, make the sequence 23.99 fps. keep the original frame size. save the AE file. Create a UHD 23.99 fps sequence for the main video, load the AE file with all the sequences in. fit all the AE sequence to the frame. add music, title. Then output as 4k youtube.

Here is the workflow I am still experimenting. Not sure where I can shorten the process.

Updated on the post, feel free to let me know if you have any questions.

[Equipment]

I went out and took some videos in the past weekend. With 3072x1308, 23.976FPS, I was able to get continued recording. Struggled a little bit when the card was almost full. And I upscaled to 4K in post-production. Looks very usable for me. And I think I can get 3520x1320 continues now. Will do more test videos.

https://www.youtube.com/watch?v=RIeJQQptR4A

Here was my setting:

Equipment
Camera: 5D Mark III with 17-40mm F4. (with 24-70mm L F2.8, sometimes can't get continued
recording)
SD Card: SanDisk Extreme Generation 1, class 10 45MB/s. Magic Lantern installed in this card
CF Card: Lexar Pro UDMA7 1066x 128 BG. Video recorded in this card.

Canon Menu setting:
Auto Lighting Optimizer: OFF
MOvie Rec. Size: 1920 24 ALL-1
Long Exp. noise reduction: OFF
High ISO Sped NR: OFF
Highlight Tone Priority: OFF

Magic Lantern setting:
Crop_rec for 4K Raw Video Recording installed.
Here is the original post by a1ex http://www.magiclantern.fm/forum/index.php?topic=19300.0
Download link here https://builds.magiclantern.fm/jenkins/job/crop_rec_4k/36/artifact/platform/5D3.113/magiclantern-crop_rec_4k.2017Jun19.5D3113.zip

Modules: enabled "crop_rec", "mlv_lite", "mlv_play" (remember to restart the camera after enabling)
Overlay: enabled "Zebras", "Focus Peak", "Spotmeter", "Histogram"
Movie: enabled "Gradual Exposure", "FPS override 23.976", "Crop Mode 3K 1:1", "Raw Video 3072x1308 2.35:1, 14bit lossess"

Recording with M mode,  1/50 sec, ISO 100, F 11