[mythtv-users] A Few Transcoder Questions
reynolds at cs.duke.edu
Fri Apr 2 01:51:30 EST 2004
On Wed, 31 Mar 2004, Nowhere wrote:
> 1. When I got to setting / recording profiles there are two options.
> MPEG2 Encoders and Transcoders. MPEG2 Encoder I get and settings are
> fine, I have two PVR 250's . Under the transcoders section there are
> TWO transcoders listed RTJPEG/MPEG4 and MPEG-2. I have no idea when I
> hit the "T" key which is being used. Since it replaces the episode when
> done recording, I would like to know before transcoding. I cant seem to
> find any settings anywhere to tell mythtv which transcoder to use.
The RTJPEG/MPEG4 and MPEG-2 entries refer to which format you're
transcoding _from_. So configure the MPEG-2 entry to your liking. It
will encode as either MPEG4 or RTJPEG -- even though its source is MPEG-2.
> 3. The one show I did transcode was much smaller in size (so I suspect
> RTJPEG/MPEG4 was used) but the video is very blocky now.
RTJPEG would be bigger, so it probably used MPEG4. Raise the bitrate if
it's too blocky. I find 2200 to be much too low. 4000 looks OK for me.
Ymmv -- with a cleaner signal, lower bitrates do better.
> 5. If I use MPEG2 as the transcoder, and I rename the extension to .mpg
> after transcoding, will it be SVCD compatible (assuming I have the
> resolution and such set correctly).
Afaik, no. Use nuvexport. Coming from MPEG-2, you may be able to use
avidemux or similar if SVCD is anything like DVD. Search the archives for
> 6. If I hit "T" for several videos, are the queued? Or does it fire the
> transcoding off in parallel? (I assume queued...)
I think they're queued. Running them in parallel would be slower in the
long run, because of disk and CPU contention.
More information about the mythtv-users