[mythtv-users] MPEG4 bigger than MPEG2?

[Raymond Wagner]

On 3/8/2012 22:51, Ross Boylan wrote:
> Hi, everyone.  I'm a new user, and am wondering why transcoding is
> making my files bigger.  More specifically, I think I have transcoded a
> file from MPEG-2 to MPEG-4, and it got a little bigger (3.1 vs 2.9GB).

It's all a function of bitrate.  MythTV will not automatically choose an 
'ideal' bitrate for you, it will use what you tell it to.  If the 
bitrate you told it to use is larger than the bitrate you recorded it 
as, you will end up with a larger file.