What can be done to increase data rate is to try to increase the file
write buffer. But that's difficult (it will require a lot of reverse
engineering for movie functions, and there's no guarantee of success).
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You can always scream, a high enough noise should do the trick
I think that the point here is NOT to record audio through the camera
in the first place, so we can achieve higher bitrates with video
How can you sync it then?
My first suggestion was the a clapper, but as jraiber stated, he's a
one-man-show, and it's just inconvenient to use a clapper when
shooting documentary. So I sugested the in-camera beep. The reasoning
is simple: If he knows the camera beeps at frame 1 of the video, and
he ears the recorded beep on the external audio recorder, then he can
sync that point in the audio to the first frame in the video, without
the need for timecodes or clappers, or sound embeded in the video
(all my batteries are empty right now, so I can't test)
This are the steps I took:
- Pressed "Rec", activated ML menu, used "don't click me" and when it
beeps the camera stops recording. When I play the video, I can ear the
audio cutting of when I press the button, and for that last second
there's no audio at all.
If I deactivate the audio recording in the Canon Menu, I can reach the
ML menu and activate the beep and the camera doesn't stop recording.
It's not too loud but I think that It can be picked up by an external
recorder (wich I don't have, so I can't test right now) if it's close
to the body.
Anyway, I feel that this could become an option ("Beep When Recording
Starts - Warning, audio must be disabled").
Here's the extra code:
if (buf == 2) Beep();
return prop_cleanup( token, property );
Was just heading to lunch, will try when I get back.
Once again, thanks!
Wow, I'll need this program too, but they don't seem to have a
standalone version. Will research it a bit.
I'm sorry if I'm wrong. I just don't understand how you can sync a
video file without any audio information, with an audio file without
timecode/clapper or any other reference. I know how to do it "by
hand", but I can't understand how a software does it. Could you
briefly explain it? From what I understood from the site you linked,
the software "replaces" the audio stream from the video (if there is
one to begin with) with an external audio file, by searching similar
patterns. Again, I repeat that what we're trying to achieve here is to
record video without sound, and sync it with an external audio source.
Usually that's what a clapper is for, so I suggested the beep to those
who can't use one.
This is a direct quote from the site (describing DualEyes, the
"The preferred solution is dual-system audio: capture sound on a
separate recorder and substitute this for the camera audio in
DualEyes™ makes this complicated process a snap. It uses the same
underlying technology as its big brother, PluralEyes®, to
automatically sync and cut the audio recording into clips that match
the video clips."
Alex, as I said in the above text, there's a standalone version called DualEyes.
Again, sorry if I'm wrong. Maybe we're just talking about different things.
The bin with the beep doesn't work. When I press "Rec" the shutter
activates, and it flashes on screen the "Error 70 - Can't start
recording while shutter being used" (or something to that extent).
No, PluralEyes needs audio to sync. It does not look at the video tracks at all."
Seems obvious now. I did wonder how it could sync without a reference, but then I drifted into another day dream.
So in short, it seems the solution viability matrix is something like this:
Pluraleyes / Dualeyes: no
Timecode: no (would need to record SMTE into the audio track, defeating the object)
The only other thing I can think of that might help is if we had some way of simultaneously triggering the start/stop recording controls on both the audio and the video recorder, which seems unlikely to be completely accurate or easy to do.
On Tue, Aug 23, 2011 at 5:24 PM, scrax <scr...@gmail.com> wrote:
> Nice idea, but it also need to change the bitrate during rec after disabling
I'm not a videomaker, I use ML for photos at first, but I was thinking if a one man clapper can't be made with a little plastic like a ruler "gently" slapped on the lens hood?
Nice tip, I'll add it to the user guide, gracias :)
When I toggle Mic Power from menu, and I connect headphones instead of
a microphone, I hear a pretty solid clicking sound.
So, you can consider the 3.5 mic jack as "audio out", and I can make
that click from magic lantern when starting recording (or so).
Please test it from ML menu first (just to see if your recorder
detects the click).
I actually have an idea about increasing the buffer size. If it works,
it could go even further. The problem is with the QScale limit at -16
(I wasn't able to remove it).
Tip: you can enter any value in config file (even CBR 10x if you like).