Magic Lantern Forum

Using Magic Lantern => General Help Q&A => Topic started by: 5uneyes on September 05, 2018, 02:27:07 PM

Title: Will disable audio make smaller files?
Post by: 5uneyes on September 05, 2018, 02:27:07 PM
First, THANKS for this great piece of software!!!

In the following months I will be doing a lot of filming but I definitely don't need audio. I wonder if I can save space (ie produce smaller files) by disabling audio.

I know I can use Canon's "disable audio" option and this works for native H.264. But...
1) is there a way to disable audio for RAW video recording (or any/all video recording in ML anyway)?
2) and most importantly, would an audio-less video file occupy less space than a video with audio?

Thanks!
Title: Re: Will disable audio make smaller files?
Post by: Walter Schulz on September 05, 2018, 02:48:56 PM
WAV bandwidth calculation is not exactly rocket science:
Sampling rate x Bit depth (x2 for stereo) = 44,100 Hz x 4 Byte = 176,400 Byte/s = 172.27 KiByte/s.
BTW: CD data rate is base for SD and CF flash memory speed index: 600x = 600x CD data rate. THey use 150 KiByte/s because of error correction, though.
Title: Re: Will disable audio make smaller files?
Post by: 5uneyes on September 05, 2018, 04:14:41 PM
OK thanks, from your reply I understand (correct me if I'm wrong) that  I save 176,400 Bytes for each second of video when using "disable audio" in RAW video, right?
Title: Re: Will disable audio make smaller files?
Post by: allemyr on September 05, 2018, 05:03:18 PM
Save and save :) 176400byte is 0.18 megabyte which is nothing compared to raw recording which is around 90mb/s.
Title: Re: Will disable audio make smaller files?
Post by: 5uneyes on September 05, 2018, 05:11:44 PM
ok so basically it makes no difference  ;)
Thanks!!