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.