[mythtv-users] New version of windows filters for mythtv

Torbjörn Jansson torbjorn.jansson at mbox200.swipnet.se
Tue Mar 2 11:55:47 EST 2004

mythtv-users-bounces at mythtv.org <> wrote:
> Torbjörn Jansson wrote:
>> mythtv-users-bounces at mythtv.org <> wrote:
>>> Torbjörn Jansson wrote:
>>>> Just wanted to tell that I have released a new version of the
>>>> directshowfilters for mythtv (0.5).
>>> I've used the .4 version on my laptop and main computer and saw bad
>>> interlacing.  Is there some way to deinterlace the video?
>> There is filters that mythbackend can use when recording. Some of the
>> filters is used to deinterlace the video.
>> The filters is applied per channel and can be added from either
>> the channel enditor in mythweb or the channel editor in the setup
>> program.
> Unfortunately I have a PVR-250, which I don't believe will
> allow me to
> use filters while recording.  I do transcode the files to mpeg-4, I
> wonder if I can deinterlace during transcode?

I don't know if filtering during transcoding is implemented or not, but I
see no reason why it shoud not be posibel.

>>> What are the advantages of reading from the backend as opposed to
>>> from an SMB share
>> Without the network filter some data will be read twice and the
>> reads will not be sequential. The network filter adds a small cache
>> to avoid seeking, this lowers network utilization and improves
>> preformance a bit.
> I had also noticed that I couldn't seek in the files.  Is
> this only true
> if I'm not accessing the file through the backend?

What kind of file is it? A mpeg2 or nupplevideo (mpeg4/rtjpeg)

If it's a nupplevideo file, a few different things coud have happened.

If mythbackend crashes before it has finished recording, no seektable will
be written to the file. If that's the case, then the nuv spliter filter will
try to rebuild the seektable by reading the whole file, but if it is using
the network filter that reads from mythbackend it will not try to scan the
file because that woud cause preformance problems.

Mpeg2 is different because it uses windows own mpeg2 spliter filters, so it
will not be able to get the seektable from mythbackend.
I don't know how mpeg2 does seeking.

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