On 12/29/2012 16:20, Antonio Roberts wrote:
switching off the [gemhead] will not push new frames into your [pix_record],
but it will not halt a "local time" (this is never what [gemhead] does).
Ah, I see now! Although this is expected behaviour, I still think it'd
be useful to be able to pause recording (at least in this scenario)
bien sur.
- either manually force the framerate to a constant value when writing the
file (it might well be (haven't checked yet) that you actually cannot force
the framerate to a given value, which indeed could be considered a bug)
I've checked the help file and options and of pix_record and there
doesn't appear to be any options to set the frame rate. Please correct
me if I'm wrong!
aye, it's a bit undocumented :-( [*]
like with [pix_video], you can set a number of properties specific to
the used backend/codec.
when selecting a specific codec, you should get a list of supported
properties for the selected setting on the info-outlet of [pix_record]
(that's the 3rd outlet).
e.g. slecting [codec mjpa( gives me available properties "framerate",
"jpeg_quality" and "jpeg_usefloat".
you can then set these properties using a "set" message:
[set framerate 20(
should give create a film with a fixed framerate of 20fps, whereas
[set jpeg_quality 15(
will give you low quality jpeg compression.
I did a bit of further investigating and it appears that the framerate
for the videos created by my patch/pix_record are craziliy high!
Here's the sample video that I used
http://dl.dropbox.com/u/350846/test.mov I ran the following command to
get some information from the file mplayer -vo null -ao null -frames 0
-identify test.mov
The important part of that information is that the fps is 1000000.000.
Something isn't right there...
hmm, i get:
$ qtinfo test.mov | grep rate
rate 0.608175 [1000000:1644263] not constant
which sounds plausible to me.
might be, that mplayer doesn't report the correct framerate (only the
numerator, not the denominator)
mfgasdr
IOhannes
[*] patches contributing to the docs are welcome.
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