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

[Edward Wildgoose]

>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).

I think that a lot of pauses on channel changes could be eeked out if you bear in mind these little latencies here and there.  For example I appear to be able to drop the number of pre-buffer frames quite low when using DVB and this makes a difference

Thanks all




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