[mythtv-users] MPEG4 bigger than MPEG2?

Karl Dietz dekarl at spaetfruehstuecken.org
Sun Mar 11 08:57:01 UTC 2012


On 10.03.2012 22:24, Raymond Wagner wrote:
> On 3/10/2012 15:39, Ross Boylan wrote:
>> I have trouble reconciling that statement with Tom Hayword's that
>> "Re-muxing from MPEG2-TS to MPEG2-PS can save up to 20%."  Can anyone
>> clarify?
>
> 20% is a bit of a worst case value, but certain containers are just more
> efficient than others.  TS containers are intended to be used for lossy
> transmissions, and cases where you may want to start at any arbitrary
> point.  That means there's padding, and lots of redundancy in the
> metadata.  Where most containers might contain one header at the start
> of the file, a TS container might intersperse them several times per second.

keep in mind that auxiliary data gets removed in that step, too. (e.g.
secondary audio channels, so you might end up with the audio description
instead of the main track. <- anecdotal wisdom)

Regards,
Karl


More information about the mythtv-users mailing list