On Thu, Oct 14, 2010 at 12:05:09AM +0000, Jacob Meuser wrote: > On Thu, Oct 14, 2010 at 12:59:37AM +0200, Jan Stary wrote: > > On Oct 13 22:07:27, Jacob Meuser wrote: > > > On Wed, Oct 13, 2010 at 11:51:47PM +0200, Jan Stary wrote: > > > > This is a fresh upgrade of current/amd64 on a Macbook3,1. > > > > Basically, everything works except the wifi and uvideo. > > > > > > > I installed the uvideo firmware as documented in uvideo(4). > > > > I can capture an image with 'fswebcam image.jpg'; > > > > I have problems capturing a video stream with > > > > ffmpeg -y -f video4linux2 -s vga -r 25 -i /dev/video0 /tmp/out.mpg > > > > (the fps eventually drops to 0 and results in a tiny file > > > > containing just a few frames) but I haven't really tried > > > > tweaking the format options. > > > > > > ffmpeg doesn't work with video(4). frankly, I don't understand why > > > video(4) support is enabled in ffmpeg, giving the the impression it's > > > supposed to work, when it clearly doesn't. > > > > On another machine (HP EliteBook 8530w running a recent -current) > > I can capture video(4) just fine - using certain resolutions and frame > > rates, that is. > > with ffmpeg? can you share your command, I've never gotten it to work.
fwiw, this is what I use, because using ffmpeg to capture directly from video(4) has never worked for me: $ video -f /dev/video1 -e yuy2 -s 640x480 -r 20 -o - | ffmpeg -y \ -f rawvideo -pix_fmt yuyv422 -s 640x480 -r 20 -i - \ -itsoffset 0.5 -f sndio -ar 16000 -ac 1 -i sun:1 out.avi the audio is just slightly ahead (out of sync) without the -itsoffset. the sndio backend in ffmpeg has fairly accurate timestamping; the stamps should represent when the sound actually happened. video(1) otoh is just outputting a stream of raw frames, so ffmpeg assumes the frames' timestamp is when they are read from stdin. apparently on this system with this camera it takes about a half second for images to be captured and sent to stdout. -- jake...@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org
