In reply to my own post:
 
> cat /dev/video0 > /mnt/store/test.mpg
> 
> Results in 700-900Mb file (soft raid5 on a pci sata card)
> 
> cat /dev/video0 > /tmp/test.mpg
> 
> Results in a 2685077440b (second attempt 2685026240b) file 
> (SiS Onboard ide)

Third time gives 2683750336b which is scarily close.

Output to the syslog at debug level 255 when it stops is

Nov 30 21:13:01 pvr kernel: ivtv: ivtv_read: stream 0..
Nov 30 21:13:01 pvr kernel: ivtv: ENC: 256 bufs, 0x00001000 fill; 255
free 0 dma 1 full 0 io
Nov 30 21:13:01 pvr kernel: ivtv: deqbuf: 0 DeQ from empty list!
Nov 30 21:13:01 pvr kernel: ivtv: Gather 1: x=1 bytes_needed 0x00001000
buf_fill 0x00001000
Nov 30 21:13:01 pvr kernel: ivtv: ENC: read 4096, 0 bytes left
Nov 30 21:13:01 pvr kernel: ivtv: v4l2 read
Nov 30 21:13:01 pvr kernel: ivtv: ivtv_read: stream 0..
Nov 30 21:13:01 pvr kernel: ivtv: ENC: 256 bufs, 0x00000000 fill; 256
free 0 dma 0 full 0 io
Nov 30 21:13:01 pvr kernel: ivtv: deqbuf: 0 DeQ from empty list!
Nov 30 21:13:01 pvr kernel: ivtv: deqbuf: 0 DeQ from empty list!
Nov 30 21:13:01 pvr kernel: ivtv: Gather 1: x=0 bytes_needed 0x00001000
buf_fill 0x00000000
Nov 30 21:13:01 pvr kernel: ivtv: deqbuf: 0 DeQ from empty list!
Nov 30 21:13:01 pvr kernel: ivtv: deqbuf: 0 DeQ from empty list!
Nov 30 21:13:01 pvr kernel: ivtv: Gather 1: x=0 bytes_needed 0x00001000
buf_fill 0x00000000
Nov 30 21:13:01 pvr kernel: ivtv: ======= valid IRQ bits: 0x00000400
======
Nov 30 21:13:01 pvr kernel: ivtv: IRQ Decoder Vsync
Nov 30 21:13:01 pvr kernel: ivtv: ======= valid IRQ bits: 0x00000400
======
Nov 30 21:13:01 pvr kernel: ivtv: IRQ Decoder Vsync
Nov 30 21:13:01 pvr kernel: ivtv: ======= valid IRQ bits: 0x00000400
======
Nov 30 21:13:01 pvr kernel: ivtv: IRQ Decoder Vsync

Then it just keeps repeating the

Nov 30 21:13:01 pvr kernel: ivtv: ======= valid IRQ bits: 0x00000400
======
Nov 30 21:13:01 pvr kernel: ivtv: IRQ Decoder Vsync

lines until I break out of it.

If I attempt it again without reloading ivtv it gives the following
output repeated.

ivtv: IRQ Decoder Vsync
ivtv: [828]result not ready, waiting 10 ms
ivtv: [829]result not ready, waiting 10 ms
ivtv: ======= valid IRQ bits: 0x00000400 ======
ivtv: IRQ Decoder Vsync
ivtv: [830]result not ready, waiting 10 ms
ivtv: [831]result not ready, waiting 10 ms
ivtv: ======= valid IRQ bits: 0x00000400 ======
ivtv: IRQ Decoder Vsync
ivtv: [832]result not ready, waiting 10 ms
ivtv: [833]result not ready, waiting 10 ms

Thanks

David



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