[mythtv-users] Slightly OT: Huge files and RTJpeg tech question

[Michael J. Lynch]

I've been experiencing some strange behavior with recorded programs.  
What I've
noticed is that some of my recorded programs are huge (9G/hour) and 
others are
the size I expect them to be.  All recording is performed using the same 
recording
profile which is set to 544x480 RTJpeg (slow machine w/bttv) quality set 
to 205.

I've noticed a pattern to this behavior however which leads me to a tech 
question
concerning RTJpeg.  All of the recordings that are the size expected are 
recordings
from channels were reception (off air analog antenna) is excellent and 
all recordings
where the file size is huge, reception is not perfect.  These "imperfect 
reception"
channels exhibit snow which appears to be electrical noise.  Anyway, 
here is the
question.  Could this noise result in RTJpegs compression algorithm not 
being able
to do a very good job of compressing the video?  If I were to lower my 
quality
setting could I get more consistant (accross channels) recording files 
sizes?

-- 
Michael J. Lynch

What if the hokey pokey IS what it's all about -- author unknown