correct me if i'm wrong but v4l doesn't allow that, the greyscale that is, as for your computer can't keeping up, if you have the space use a faster, very low compression, maybe even raw frames and encode it later, but that might not be an option since i think you mentioned doing something with motion detection On Mon, 2003-06-09 at 19:00, Martin_Osmundsvåg wrote: > Hi Pete! > > I downloaded ffmpeg-cvs-2003-06-05.tgz and it compiled right away. I > think the transcode gives better results, but then you probably want to > install som other packages as well. I have installed the following (I'm > not sure which one is needed) > > divx4linux-20020418.tgz > xvidcore-0.9.1.tgz > avifile0.7-0.7.37.tgz > > I'm using MPlayer-0.90,tgz to play the movie in the framebuffer console. > I think the xvideocore is preferred by many divX people. > > I tried to use the transcode again with some different parameters, but > my computer can't keep up: > > # transcode -i /dev/video -x v4l --import_v4l 1 -c 00:00:05 -g 68x576 -y > divx5 -z -K --divx_quant 1,5 -u 300,1 -o test.avi > > This is a greyscale output, what I like, but I would rather grab it in > grayscale from the v4l-device in the first place. I can't find any > options for transcode to change the format of the input. > > Well, i don't know if this help... > > - Martin O. > > > Peter Farrow wrote: > > > Hi Martin... > > > > ffmpeg I found impossible to make it work (how did you do this?) - it > > was hard enough to even find it to compile... > > > > I had success with the berkley mpeg encoder but it is VERY slow, and > > overlapping motion mpegs eventually get the better of the machine with > > multiple cameras... > > > > I have never tried transcode > > > > regards > > > > Pete > > > > > > Martin Osmundsvåg wrote: > > > >> Hi! > >> > >> I was woundering about peoples experience with different codec's when > >> grabbing from a v4l device to record a PAL input in best possible > >> quality. I have tried nvrec, ffmpeg, and transcode. I have used > >> options like: > >> > >> # transcode -i /dev/video0 -x v4l --omport_v4l 1 -c 00:0015 -g > >> 768x576 -y divx5 -z -o test.avi > >> # ffmpeg -vd /dev/video0 -r 25 -an -s 768x576 -hq -vc 1 -t 300 test.mpg > >> > >> I can't use an MPEG-chip card when I want to analyse the raw frame > >> before doing the decoding (i.e. motion detection). Someone said that > >> I couldn't do this with the v4l interface, so I'm using a Pinnacle > >> PCTV card with the bttv driver. > >> I'm using an AMD XP2600+ with 512MB 333MHz RAM, MSI motherboard with > >> KT400 chipset, IDE disks (possible with software RAID1), running > >> Slackware9.0, kernel 2.4.20. > >> > >> Do anyone have a comment or some references? > >> > >> Thanks! > >> > >> - Martin O. > >> > >> > >> -- > >> video4linux-list mailing list > >> Unsubscribe > >> mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe > >> https://www.redhat.com/mailman/listinfo/video4linux-list > > > > > > > > > > > > -- > > video4linux-list mailing list > > Unsubscribe > > mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe > > https://www.redhat.com/mailman/listinfo/video4linux-list > > > > > -- > video4linux-list mailing list > Unsubscribe mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/video4linux-list >
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