Hello there. I spent some time googling around and looking at the list archives, but I cannot find a (non-X11) software that would let me do a 'simple' video recording without any fancy stuff or reencoding.
I'm using a logitech S7500 for my tests, it's an UVC cam with support for MJPEG. I could use mencoder to record the 'raw' mjpeg stream without any re-encoding but that also means without audio: it segfaults if I try to record audio too (either from the cam usb audio source or from the alsa soundcard in the pc). I can still record audio in another process and mix everything afterwards, no big problem. The _real_ problem is that video is never recorded at constant speed. It probably depends on the camera varying the framerate (autoexposure or stuff like that, probably) and/or usb or the hci loosing some data here and there. But this is also not a problem (loosing frames) as long as I get a playable video. Too bad this is not the case: the actual speed will vary and some parts will be faster than others. I'm not an expert but I suspect this is due to the "timestamps not implemented" that I read on UVC homepage. I'm working on a more-or-less embedded platform (the prototype actually is a notebook without any human operator and also without X11) and I'm looking for a software (or a combination of) that would let me: - set the cam to turn off fancy stuff and run as constant fps as it can - don't need ultrafast, 640x...@25fps would be enough - record the video with the lowest possible cpu usage - I think a direct MJPEG recording from the cam to file should be the best option - playback / reencode the video afterwards and get a 'constant wall clock speed' video (no problems if it looses frames as long as this is accounted for) - audio recording in the same file would be a bonus but not needed, alsarec is already doing its job I don't really need anything else, the system will start recording right after boot and keep on until power off. Right now I'm using the latest stable kernels from kernel.org, but applying any patch and recompiling is not a problem. If possible, I plan to stick to UVC cameras with MJPEG support, probably logitech ones. Any help would be really appreciated, thanks. -- Luca Lesinigo _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
