Re: [mythtv-users] Issues with new DVB card (aspect ratio and interlacing)
On Mon, 2005-04-25 at 22:13 +1000, Marlor LPE wrote: > As far as I can see MythTV is encoding this raw data > straight to MPEG-4 (or RTJpeg). It would be nice if > there was some way to deinterlace during this encoding > process, as the OS X version of MythTV is extremely > inefficient when it comes to zooming or deinterlacing > during playback (it results in >3x the CPU > utilization). If you are using DVB then you will be getting a MPEG stream directly from the card and just streaming it to disk - Myth will do pretty much nothing with it, it certainly does not re-encode. > However, in my case, I am still encoding the video > stream in software, as I don't believe that my DVB > card has a hardware MPEG encoder built in. It won't have a hardware MPEG encoder - doesn't need one since the over- the-air format is MPEG. Nigel. -- [ Nigel Metheringham [EMAIL PROTECTED] ] [ - Comments in this message are my own and not ITO opinion/policy - ] ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Issues with new DVB card (aspect ratio and interlacing)
On 4/25/05, Marlor LPE <[EMAIL PROTECTED]> wrote: > However, in my case, I am still encoding the video > stream in software, as I don't believe that my DVB > card has a hardware MPEG encoder built in. It doesn't need one, DVB-T broadcasts are already encoded in MPEG-2. James. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Issues with new DVB card (aspect ratio and interlacing)
> > 1. I can't use filters such as "kerneldeint" when > > encoding. This seems strange, since MythTV is > > encoding the stream to MPEG-4, just as it did > > with the analogue card. > > I dont think its being deinterlaced because with > DVB you are capturing the raw data, not frame > grabbing. As far as I can see MythTV is encoding this raw data straight to MPEG-4 (or RTJpeg). It would be nice if there was some way to deinterlace during this encoding process, as the OS X version of MythTV is extremely inefficient when it comes to zooming or deinterlacing during playback (it results in >3x the CPU utilization). The MythTV docs actually mention the limitations for filtering with DVB: "These [filters] may be used when encoding in software (MPEG-4, RTjpeg) but do not apply when using a capture card with hardware encoding such as those supported by the ivtv driver, DVB, HDTV or MJPEG cards". However, in my case, I am still encoding the video stream in software, as I don't believe that my DVB card has a hardware MPEG encoder built in. > > 2. The aspect ratio is stuck at 16:9. This means > > that when a show is broadcast in 4:3, there are > > black bars at the top, bottom and sides. > > Check your mythfrontend settings to make sure you > don't have override aspect ratio on. As Ben de Luca noted, all broadcasts (even those with a 4:3 aspect ratio) are broadcast in 16:9 here in Australia. AFAIK, our digital set-top-boxes simply zoom these to 4:3 when the "aspect" button is pressed on the remote. It would be great if there is a way to do this on the server side (via transcoding or via the recording filter chain), since the Mac mini chokes when trying to do it (and the XBox struggles a bit too). Find local movie times and trailers on Yahoo! Movies. http://au.movies.yahoo.com ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Issues with new DVB card (aspect ratio and interlacing)
2. The aspect ratio is stuck at 16:9. This means that when a show is broadcast in 4:3, there are black bars at the top, bottom and sides. Check your mythfrontend settings to make sure you dont have override aspect ratio on. The australian tv stations all broadcast in 16:9 -- Regards, ~CM ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Issues with new DVB card (aspect ratio and interlacing)
> 1. I can't use filters such as "kerneldeint" when > encoding. This seems strange, since MythTV is encoding > the stream to MPEG-4, just as it did with the analogue > card. I dont think its being deinterlaced because with DVB you are capturing the raw data, not frame grabbing. > > 2. The aspect ratio is stuck at 16:9. This means that > when a show is broadcast in 4:3, there are black bars > at the top, bottom and sides. Check your mythfrontend settings to make sure you dont have override aspect ratio on. -- Regards, ~CM ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
[mythtv-users] Issues with new DVB card (aspect ratio and interlacing)
Hi All, I've been running MythTV for quite a while with an analogue tuner card, using an XBox (and more recently a Mac mini) as the frontend. All the deinterlacing has been done server-side while encoding, so this has been working extremely well. This weekend, I decided to switch to a DVB-T card (XPERT DTV-DVB-T with the cx88xx chipset). The card is now set up and working with MythTV, but I have two issues: 1. I can't use filters such as "kerneldeint" when encoding. This seems strange, since MythTV is encoding the stream to MPEG-4, just as it did with the analogue card. 2. The aspect ratio is stuck at 16:9. This means that when a show is broadcast in 4:3, there are black bars at the top, bottom and sides. When using my PC as a frontend, I can deinterlace the picture during playback and alter the aspect ratio in order to fix these issues. Unfortunately, the Mac mini does not cope well with either of these workarounds (applying any zooming or filters sends the CPU usage sky-high), so does anyone have any advice of a solution on the server-side? Thanks, Aaron Find local movie times and trailers on Yahoo! Movies. http://au.movies.yahoo.com ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
