[mpeg2] Hardware Mpeg2 Encoding

Joe Briggs jbriggs at briggsmedia.com
Wed Aug 3 01:29:56 CEST 2005


The ivtv (pvr-250/150/350/500) driver can produce TS streams in constant
bit-rate. I might have a utility which can do it for you if you are in a
bind.

Joe

On Tue, 2005-08-02 at 15:30 +0200, Johannes Stezenbach wrote:
> On Thu, Jul 28, 2005 sebastien Pastor wrote:
> > I ve been asked to produce some Mpeg2-TS output (this output will be 
> > carried out by our satellite provider). The video sources i have are DV 
> > files. So i thought i could use ffmpeg to transcode to MPEG2 PS then VLC 
> > to convert into TS but ... our satellite provider requirements are 
> > strict  : they want : 2500Kb/s rate in CBR.. Using ffmpeg the result is 
> > not sooo good (many artifacts visible) and even after fiddling around 
> > with the thousands of mpeg2 options i can t get a good result .... So i 
> > thought i ve reached the limit of software encoding ... ?
> > So here are my questions to you mpeg2 experts : do you think if i move 
> > to an mpeg2 compression card i should be able to get better results even 
> > @ low rates with strict CBR ? Would you recommend a card for this 
> > purpose ? Have heard about the hauppauge 350 card, do you reckon i 
> > should go for this (even it looks like it is a TV Tuner as well ...) ? 
> > If yes how could i proceed to make the card compress my DV files (using 
> > VLC ?)
> 
> I don't know much about mpeg encoding, but I think consumer grade
> hardware encoders won't give you the best possible quality, because
> they need to encode in real time, but have limited processing power.
> 
> ffmpeg or other encoders should be able to give you better results, but
> I think they won't give you strict bitrates even in CBR mode. You would
> need to do a few experiments to find a parameter setting to ensure
> the maximum bitrate never exeeds your limit, while still using
> as much as possible of the available bandwidth, and add some
> stuffing later to ensure the reulting stream has strict CBR.
> 
> I don't know if there is an OpenSource tool to do that. Usually the
> broadcasters have tools to do that, though.
> 
> HTH,
> Johannes
> 
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