[mythtv] Effect of Multi-rec on channel change times....?

Steven Ellis steven at openmedia.co.nz
Fri Jul 13 01:02:09 UTC 2007


On Fri, July 13, 2007 2:08 am, Mark Buechler wrote:
> The problem here is not the channel changing time of the backend but more
> the buffering time of the frontend. The backend actually changes channels
> quite fast, in my opinion, considering what it's doing. Myth's frontend at
> times seems to have trouble estimating bitrate and tends to buffer too
> much
> and then read too much, resulting in more prebuffering. On most HD
> content,
> however, it does quite well on since the bitrate is much higher.
> Basically,
> I think Myth/ffmpeg is estimating bitrate too high is most circumstances.

Yes the delights of VBR MPEG2 video. Its not uncommon to see DVB streams
tagged as 10Mbit, but averaging 4 or 6Mb. Its no wonder the code has
issues estimating when it has enough data for playback.

--------------------------------------------
Steven Ellis - Technical Director
OpenMedia Limited - The Home of myPVR
email   - steven at openmedia.co.nz
sales   - sales at openmedia.co.nz
support - support at openmedia.co.nz
website - http://www.openmedia.co.nz


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