[mythtv-users] Automatic onversion from MPEG-2 to H264
belcampo at zonnet.nl
Tue Mar 24 19:00:13 UTC 2009
David Brodbeck wrote:
> Gerald Brandt wrote:
>> 2. Any hints on getting the best quality?
> Two-pass will give significantly better quality than one-pass at the
> same bitrate. If you're not in a big hurry, use two-pass.
Quality ain't better, but uses slightly less diskspace, so average
bitrate will be a little lower, needing less diskspace.
> Quality is highly subjective.
setting qmin=16 qmax=32 will visually give good results.
Setting qmin to lower value will get higher quality, needing more
processing power, more bits, more diskspace.
Setting qmax to a higher value will save bits, but lower quality
I suggest taking a short recording that's
> representative of what you watch and doing a few test encodes at
> different bitrates. It will also depend a bit on signal quality --
> noisier signals will need a higher bitrate, because random noise is hard
> to encode.
> Consider not re-encoding the audio. It's probably AAC,
I don't think a PVR-150 produces AAC.
which is pretty
> good compression to start with. I find just stream copying the audio
> tends to do a better job preserving sync. Note that AAC audio in an AVI
> container is technically a standards violation, but MythTV plays it
> fine. AAC audio in an MPEG4 container is valid but is kind of hit or
> miss with Myth. I have one Myth system that plays them fine, and
> another that will play some MPEG4 AAC files but not others.
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