Choppy v4l2/bttv capture

[charlie at sensoray.com]

$ gst-launch-0.10 avimux name=mux ! filesink location=avcap.avi \
             v4l2src device=/dev/video0 ! video/x-raw-yuv,width=320,
             height=240,framerate=\(fraction\)30000/1001 ! \
             ffenc_mpeg4 ! queue ! mux. alsasrc device=hw:1,0 ! \
             audio/x-raw-int,rate=32000,channels=2,depth=16 !
             audioconvert ! lame ! mux.

worked fine, with a SAA713x-based capture module, Sensoray Model 911 (
http://www.sensoray.com/products/911.htm )


> Hi,
>
> Been looking at converting VHS tapes into nice open digital media,
> using GStreamer naturally. However I'm having problems getting smooth
> recordings.
>
> I'm doing this on a Dual core Intel 3.06GHz with 4GB RAM running Fedora
> 16 (64bit) and using a Hauppauge Win/TV pci, Brooktree Corporation
> Bt878 Video Capture card.
>
> Using tvtime to watch videos works fine and I can capture video (and
> audio) using mencoder with the following:
>
> mencoder tv:// -tv driver=v4l2:device=/dev/video1:alsa:adevice=hw.1,1 -oac
> copy  -ovc lavc -o video.avi
>
> and playback of the resultant video is smooth.
>
>
> However, I just can't get smooth video with GStreamer.
>
> E.g, using the following:
>
> gst-launch oggmux name=mux ! filesink location=vid.ogv v4l2src
> device=/dev/video1 ! videorate !
> video/x-raw-yuv,width=320,height=240,framerate=25/1 ! ffmpegcolorspace !
> queue ! theoraenc bitrate=800 ! queue ! mux. alsasrc buffer-time=100000
> device=hw:1,1 ! audio/x-raw-int,channels=1,rate=119466 ! audioconvert !
> queue ! vorbisenc ! mux.
>
> Works in as much as I get a Ogg Theora file that plays back and bits
> where there isn't a lot of movement look fine, however, scenes with a
> lot of (or not even that much) motion become choppy.
>
> Note: The above command was cobbled together by a lot of scouring the
> internet and trial and error. So I wouldn't be surprised if it's wrong
> in various ways.
>
> Any idea's would be appreciated.
>
> Cheers,
> Andrew
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