[mythtv-users] 68% filesize increase after transcode!
George Nassas
gnassas at mac.com
Sat Sep 24 21:44:39 UTC 2005
On 24-Sep-05, at 12:38 PM, Greg Grotsky wrote:
> Is RTjpeg not a good compression algorithm?
Depends what you're after - from a compression point of view it's a
terrible algorithm, from a speed of encoding point of view it's
terrific. RTjpeg is mostly used by people with frame-grabber cards,
that is, tv tuner cards that will tune a channel but not encode the
signal into an mpeg2 stream. Encoding into mpeg can be cpu-intensive
and hard for software to do in real time so people use the less
intensive rtjpeg format and then transcode to a much more efficient
format like mpeg2 or 4 later on.
However, if you already have an mpeg2 file then transcoding *to* rtjpeg
is a little like transferring your home videos to flammable nitrate
stock.
- George
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