[mythtv-users] MPEG4 bigger than MPEG2?

Raymond Wagner raymond at wagnerrp.com
Fri Mar 9 05:50:59 UTC 2012


On 3/9/2012 00:41, Ross Boylan wrote:
> On Thu, 2012-03-08 at 23:56 -0500, Raymond Wagner wrote:
>> 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.
> How can I tell what  bitrate a recording is at?

file size (in bytes) / duration of recording (in seconds) * 8


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