[mythtv] RE:Re: [PATCH] Increase block size

[Isaac Richards]

On Wednesday 24 December 2003 06:12 am, Edward Wildgoose wrote:
> >Now lets say she sets her bitrate for 0.9GB/hour or 1/4MB/sec.
> >Now the encoder needs to run for a full second in order to have
> >256000 that it can return. If the block size was 64000 it would
> >again take 0.25sec. Therefore the different in blocksize adds
> >0.75sec to every channel change.
>
> Indeed.  Notice also that the PVR250 recorder code appears to want to read
> large chunks at a time from the card (128K I think?)  This may cause
> additional latency, expecially if it's an odd multiple of network packet
> size (unlikely).

The pvr250 reads a frame at a time -- the 128k is just an upper limit on a 
single read.

Isaac