I have a Bt878-based capture card on Linux (bttv.ko, V4L(2)) which I'm trying to use to record some video from an NTSC VCR and/or camcorder. I used mencoder tv:// -tv input=1:norm=NTSC:driver=v4l2 -of mpeg \ -oac mp3lame -ovc lavc -quiet -o foo.mpg which seems to work - if I view the file in mplayer, it looks OK. But if I seek through the video with the cursor keys, I get repeated warnings: first frame is no keyframe, and there are severe artefacts in the display until things settle down. A second tape is not so good - things never settle down entirely, and the audio sounds distorted in places. Encoding also produces errors like ERROR: scr 1.180, dts 0.000, pts 0.946 BUFFER UNDEFLOW at stream 1, raising muxrate to 3188 kb/s, delta_scr: 138725 ERROR: scr 1.237, dts 0.000, pts 1.103 Are there some encoding parameters I should use, or driver parameters for bttv, that would make this more reliable ? I tried sc_threshold=-500000000 with little effect -- Andrew Daviel, TRIUMF, Canada
