[mythtv-users] Automatic onversion from MPEG-2 to H264

[belcampo]

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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