[mythtv-users] Re: Bit Rates. [Was Commercial Flagging vs.
Transcoding]
Jeff
jeff at intersystems.com
Thu Feb 19 10:18:04 EST 2004
At 05:04 PM 2/18/2004 -0500, you wrote:
>John DeLuca wrote:
>
>>I currently transcode all recordings (set to kick off immediately
>>following completion of recording). I don't intend to save the files...I
>>merely transcode to have the commercials flagged so when I watch them
>>later, I can skip past them (assuming it's done a good job of properly
>>detecting commercials).
>>
>>In reading another post, I am wondering if I really need transcoding?
>>I have a PVR-x50 and the recording profiles are set up for MPEG2- at 2200
>>bits for 720x480. That's also the setting of transcoding. My questions are:
>
>Bit rates are bit rates. To benefit from transcoding you want to lower
>the bit rate. MPEG4 can produce better looking images at lower
>bitrates. 2200 is REALLY low for the resolution you're capturing your
>MPEG2 stream at. Try 440x480 at that bitrate and you'll notice a nice
>improvement in image quality for "free" (assuming you're capturing NTSC)
I've seen various posts from different people about resolution v. bitrate and
MPEG2 v. MPEG4. I've done a lot of playing around with this and I have settings
that work well but is there some rule of thumb people have for choosing values
for these settings?
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