Hi
I am using 3gp video with GEM on windows and linux. Under windows XP on some machines pix_film does not return the right video length in frames, it returns 1, testing with same video and patches in another machine returns the right length. Does this sound like some Windows issue? maybe some codec that needs to be installed? I need to find a format for video that works fine crossplatform.
i also noticed since i upgraded to latest GEM that the 3pg videos play its sound after being loaded. This does not seem to be done via PD (sound is off), the sound plays once after the video is loaded. If the video being rendered the sounds keeps playing looped but chopped, with very short periodical interruptions.
thanks
enrike
On Mon, 2008-06-09 at 11:57 +0200, altern wrote:
Hi
I am using 3gp video with GEM on windows and linux. Under windows XP on some machines pix_film does not return the right video length in frames, it returns 1, testing with same video and patches in another machine returns the right length. Does this sound like some Windows issue? maybe some codec that needs to be installed? I need to find a format for video that works fine crossplatform.
i don't think, that it's the best idea to use a format like 3gp for use with Gem. the goals of the 3gp format and working with video in Gem usually are quite different: 3gp is meant to be a suitable videoformat for small devices with only low resolution and high compression (it uses mainly h.263 and h.264 as video codecs), whereas usually with Gem file size is less important than for instance a fast codec and easy random access to frames. codecs with highly optimized compression usually work only when playing forward at single speed because of certain frametypes that rely on previous and future frames (interframe compression). i think it is best to not use such a codec when used in Gem, but rather an intraframe compression based codec, whereas each frame is compressed separately. from my experience the quicktime mov format with mjpeg (motion jpeg) works quite well and doesn't have too much cpu overhead. probably other people have other suggestions. on windows, avi format with dv codec might be running well (so you don't need to install quicktime).
roman
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Roman Haefeli(e)k dio:
On Mon, 2008-06-09 at 11:57 +0200, altern wrote:
Hi
I am using 3gp video with GEM on windows and linux. Under windows XP on some machines pix_film does not return the right video length in frames, it returns 1, testing with same video and patches in another machine returns the right length. Does this sound like some Windows issue? maybe some codec that needs to be installed? I need to find a format for video that works fine crossplatform.
i don't think, that it's the best idea to use a format like 3gp for use with Gem. the goals of the 3gp format and working with video in Gem usually are quite different: 3gp is meant to be a suitable videoformat for small devices with only low resolution and high compression (it uses mainly h.263 and h.264 as video codecs), whereas usually with Gem file size is less important than for instance a fast codec and easy random access to frames. codecs with highly optimized compression usually work only when playing forward at single speed because of certain frametypes that rely on previous and future frames (interframe compression). i think it is best to not use such a codec when used in Gem, but rather an intraframe compression based codec, whereas each frame is compressed separately. from my experience the quicktime mov format with mjpeg (motion jpeg) works quite well and doesn't have too much cpu overhead. probably other people have other suggestions. on windows, avi format with dv codec might be running well (so you don't need to install quicktime).
thanks for the tips! i dont know much about video compressions so it is very useful.
enrike
altern wrote:
Hi
I am using 3gp video with GEM on windows and linux. Under windows XP on some machines pix_film does not return the right video length in frames, it returns 1, testing with same video and patches in another machine returns the right length. Does this sound like some Windows issue? maybe some codec that needs to be installed? I need to find a format for video that works fine crossplatform.
is quicktime installed on both machines? which version? (QuickTime is the preferred video decoder library on w32; if it is not available it falls back to DirectShow; the libraries might behave slightly different (though Gem tries hard to make them appear the same)
i also noticed since i upgraded to latest GEM that the 3pg videos play its sound after being loaded. This does not seem to be done via PD (sound is off), the sound plays once after the video is loaded. If the video being rendered the sounds keeps playing looped but chopped, with very short periodical interruptions.
as you are experiencing changes between versions it is always useful if you can include information about the actual versions you are using (in both cases); compile date _does_ matter!
anyhow, i thought i had fixed the audio-playback via the quicktime decoder (no Pd involved) in recent builds (the CVS-commit dates to 2008/05/09)
mgfadr IOhannes
IOhannes m zmoelnig(e)k dio:
altern wrote:
Hi
I am using 3gp video with GEM on windows and linux. Under windows XP on some machines pix_film does not return the right video length in frames, it returns 1, testing with same video and patches in another machine returns the right length. Does this sound like some Windows issue? maybe some codec that needs to be installed? I need to find a format for video that works fine crossplatform.
is quicktime installed on both machines? which version? (QuickTime is the preferred video decoder library on w32; if it is not available it falls back to DirectShow; the libraries might behave slightly different (though Gem tries hard to make them appear the same)
aha. this sounds like might be the way to investigate. I know i have QT installed but not sure about the second machine. I am going to ask. thanks.
i also noticed since i upgraded to latest GEM that the 3pg videos play its sound after being loaded. This does not seem to be done via PD (sound is off), the sound plays once after the video is loaded. If the video being rendered the sounds keeps playing looped but chopped, with very short periodical interruptions.
as you are experiencing changes between versions it is always useful if you can include information about the actual versions you are using (in both cases); compile date _does_ matter!
i know, i know... but i dont have the second machine with me. I also am fairly sure we had both same version when I did the tests 0.39-3 extended with GEM 0.91-cvs compiled Dec 11 2006. Pretty old one... So I thought this error might be more to do with some codec not being installed on the system, or some windows version issue. I am going to try to get more info on the second system.
anyhow, i thought i had fixed the audio-playback via the quicktime decoder (no Pd involved) in recent builds (the CVS-commit dates to 2008/05/09)
thank you very much!
enrike
altern wrote:
i know, i know... but i dont have the second machine with me. I also am fairly sure we had both same version when I did the tests 0.39-3 extended with GEM 0.91-cvs compiled Dec 11 2006. Pretty old one... So I thought this error might be more to do with some codec not being installed on the system, or some windows version issue. I am going to try to get more info on the second system.
afaik, only the QuickTime API exposes the behaviour of automatically playing back the audio (not the DirectShow API)
masdr IOhannes
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altern -
IOhannes m zmoelnig -
Roman Haefeli