[mythtv-users] Direct software mpeg-1 encoding(live)

[Dhiraj Gaurh]

I'm interested in mpeg-1 :) that's because VCD players are 1/3rd the 
price of DVD players and CD's ten times lower in price than DVD's. 
Surely that counts for something :) I'll see what I can do about it ! 
Seems rather simple, just have to get around to it. That said I'll see 
if I can do something about direct mpeg-2 encoding. There are other 
players which do have this option(as I mentioned). If their options turn 
out to be useful on my machine (Athlon T-Bird 950) then I will add them 
to myth If it is possible it will be a nice thing to have. The rte 
library claims real-time software mpeg-1/2 encoding, anybody used it 
folks ??

Joseph A. Caputo wrote:

>On Tuesday 27 January 2004 09:55, Dhiraj Gaurh wrote:
>  
>
>>Hello friends,
>>  Some time ago I had written a mail to this list saying that it
>>would be very nice if we could encode in mpeg-1 (or 2 if you please)
>>directly, rather than encoding in mpeg-4 and later transcoding it to
>>mpeg-1. Many people on this list said that it is not possible to do
>>mpeg-1 encoding in software as it consumes too much CPU. It sounded
>>rather strange to me that it was possible to do live mpeg-4 encoding
>>but not mpeg-1. I thought since mpeg-4 compresses more so it should
>>require a faster CPU. It turns out that I was right. I was just
>>looking at the freevo page(another free Linux PVR application). It
>>says it is possible to do direct mpeg-1 VCD quality encoding using a
>>Celeron 400 MHz but mpeg-2 and mpeg-4 require more CPU power. This
>>seems to be a true statement. It is possible to directly make a VCD
>>file with Freevo, zapping or the standalone mp1e library.So now, if
>>you can't do live mpeg-4 encoding and you don't have enough disk
>>space to store your recorded RTJPEG or if you want to make a VCD
>>anyway and don't want to bother about transcoding from RTJPEG/mpeg-4
>>to mpeg-1, you can do it !! That's really nice. It will be quite nice
>>if we include direct mpeg-1/2 encoding support into mythtv. That
>>would be a very nice and useful addition. Let me see what I can do
>>about it. If I get some time. It will take a few months if I have to
>>do it myself though. The actual work itself shouldn't take a lot of
>>time though. The encoder is already there, you just need to put a
>>hook into mythtv to make use of it. Seems rather simple to me.
>>Perhaps there are reasons why mythtv would not want to use mp1e or
>>rte but I am not aware of them. As far as I know, they are open
>>source.
>>    
>>
>
>
>I believe the previous thread was regarding software MPEG-2 encoding 
>only, and I believe that most folks don't have the power required to do 
>realtime MPEG-2 encoding in software.  MPEG-1 was never really brought 
>up because most people don't seem to be interested in the limited 
>quality you get out of a VCD-compliant MPEG-1 stream.  VCD is 
>fixed-bitrate (1150 or 1250 IIRC) and the quality is not all that 
>great, IMHO.  MPEG-2 is desirable because it used in both the SVCD and 
>DVD standards, which both allow for better quality, higher bitrates and 
>(for DVD) multiple resolutions.
>
>That said, I'm certainly not against MPEG-1 if someone wants to do the 
>code, but I suspect you'll find little interest in adding the support.
>
>-JAC
>
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>

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