[FFmpeg-user] theora question

[Tom Sparks]

--- On Fri, 27/4/12, Rick C. <rickcorteza at gmail.com> wrote:

> From: Rick C. <rickcorteza at gmail.com>
> Subject: Re: [FFmpeg-user] theora question
> To: "FFmpeg user questions and RTFMs" <ffmpeg-user at ffmpeg.org>
> Received: Friday, 27 April, 2012, 11:46 AM
> 
> On Apr 26, 2012, at 10:46 AM, Tom Sparks wrote:
> 
> > --- On Thu, 26/4/12, Rick C. <rickcorteza at gmail.com>
> wrote:
> > 
> >> From: Rick C. <rickcorteza at gmail.com>
> >> Subject: Re: [FFmpeg-user] theora question
> >> To: "FFmpeg user questions and RTFMs" <ffmpeg-user at ffmpeg.org>
> >> Received: Thursday, 26 April, 2012, 10:49 AM
> >> 
> >> On Apr 25, 2012, at 1:50 PM, Carl Eugen Hoyos
> wrote:
> >> 
> >>> Rick C. <rickcorteza <at>
> gmail.com>
> >> writes:
> >>> 
> >>>> On Apr 24, 2012, at 2:08 PM, Tom Sparks
> wrote:
> >>>> 
> >>>>> use the true ffmpeg2theora transcoder
> >>> 
> >>>> Actually I made a quick trial using this
> >>>> and I didn't see a significant difference
> in speed?
> >> 
> >>> 
> >>> Not very surprising given that ffmpeg2theora is
> using
> >> libtheora 
> >>> and FFmpeg.
> >>> 
> >>>> The same example I used previously which
> was
> >> getting
> >>>> only 40fps was about the same with
> ffmpeg2theora. 
> >>> 
> >>>> Quality was a bit better though. 
> >>> 
> >>> That is indeed surprising.
> >>> 
> >>>> In general does theora just not take
> advantage of
> >> multithreading?
> >>> 
> >>> Are you sure theora is the right choice for
> encoding?
> >>> There should be better and faster codecs for
> every use
> >> case.
> >>> 
> >>> Carl Eugen
> >>> 
> >> 
> >> 
> >> Regarding the quality I didn't mean to say that
> ffmpeg
> >> couldn't match the quality of ffmpeg2theora with
> the correct
> >> settings,
> > I dont think ffmpeg has the option for theora
> >> just the settings that I used for my trials which
> >> was only -qscale 10. 
> > ffmpeg2theora dose not have a qscale
> > 
> >> I left ffmpeg2theora on the
> >> default setting which I read was 6 if I'm not
> >> mistaken.  Anyways, regardless of adjustments
> I had
> >> roughly the same speed everytime that's what I
> meant when I
> >> said I didn't see any significant changes.
> > I think you can speed it up by using: -d 1
> > but it can only be used with --videobitrate 
> >> Yes this (theora) wouldn't be something I would
> want to use
> >> everyday, I was just doing some testing and noticed
> that
> >> it's quite slow no matter what I did and I came
> here to make
> >> sure it wasn't something wrong I was doing.
> :-)  So
> >> seems it's not me but the nature of the
> codec.  I
> >> appreciate the help everyone.
> > what are the other codec you comparing theora to?
> >> 
> >> rc
> > tom
> >> 
> 
> 
> Well the few tests I ran were again MPEG-4.  I didn't
> make a very thorough set of tests I must say, but when I got
> 400 fps with MPEG-4 and 40 fps with theora a red flag went
> up regardless of quality. :-)
witch mpeg-4?
mpeg-4 part 2 (XVID, DVIX,etc) or mpeg-4 part 10 (H.264)
> 
tom sparks
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