Raw video shooting problem

Started by thebandrick, May 30, 2015, 09:27:08 PM

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thebandrick

Hello everyone ,

I've installed Magic Lantern on my Canon 70d without any problem , it works just fine , but there is still something :

When i shoot Raw video , in every mode it skips frames after 7-8 seconds and my video stops :/

I have a lexar 60mbits/sec , and it still does it when i choose a 54mbits/sec video resolution , i have tried the different options in the menu's like the Sd card ''warming'' but nothing seems to work .. I usually shoot in 2.35/1 aspect ratio on 1824x776
Also , there is a limit in raw video (i think all of you know) who says that i can't go over 1824 in the current video mode . Is there a way that i can go over this limit ? What is the ''current video mode'' ?
A know i can ignore the frame skipping , but it's not really a solution for me :/

Thank you a lot , i would me recognizing if someone would help me use this wonderfull feature properly :D

Walter Schulz

70D's SD-card interface is limited to about 41 MByte/s write rate.
And I really hope you mixup bit and byte ...

thebandrick

Yeah i never really understood the difference (i know a byte is a group of 8 bits ) , but i don't know which one is in my case ..

I have a Lexar 400x 60Mb\s , so is it bytes or bits ? ..
So my 70d doesn't even support my lexar's speed ?
I just ran a benchmark on my canon and it says write speed 20MB\s , what the heck ?

Thanks for your answer

Walter Schulz

Press Play button after starting benchmark.
And manufacturer numbers will be valid for read, not write operation. Write numbers can be significantly lower.

thebandrick

Alright , i get it . So what sd card should i choose to make sure the write speed is the best i can get (41MB/s) ?

nikfreak

41MB/s is just a peak for some milliseconds. You will get 37-39MB/s for raw/mlv recording. take a look here for cards:
http://www.magiclantern.fm/forum/index.php?topic=12630.0

I am using Sandisk Extreme Plus. But the cheaper non-plus should do the trick, too.

[size=8pt]70D.112 & 100D.101[/size]