[theora-dev] Fwd: Theora developer question.

[Alexey Fisher]

Hi Beorn,

1. replace "-v 7" to "--optimize --two-pass --soft-target -V 2000" you
will get about 200MB file size with no changes in quality.

2. try to use libtheora ptalarbvorm, it is in alpha state but has some
improvements. You can find comparison here:
http://people.xiph.org/~xiphmont/demo/theora/demo9.html

if you use ubuntu 10.10 you can download precompiled libtheora and
ffmpeg2theora on my ppa:
https://launchpad.net/~bug-track/+archive/xiph

or just binary ffmpeg2theora here:
http://firefogg.org/nightly/
http://v2v.cc/~j/ffmpeg2theora/download.html

Regards,
Alexey Fisher

Am Sonntag, den 10.10.2010, 15:51 +0200 schrieb Ton Roosendaal:
> Hi,
> 
> 
> See below info from Beorn, about our ogg versions.
> 
> -Ton-
> 
> 
> ------------------------------------------------------------------------
> 
> Ton Roosendaal  Blender Foundation   ton at blender.org
> www.blender.org
> 
> Blender Institute   Entrepotdok 57A  1018AD Amsterdam   The
> Netherlands
> 
> 
> 
> Begin forwarded message:
> 
> > From: Beorn Leonard <beornl at ozemail.com.au>
> > Date: 9 October, 2010 12:27:16 GMT+02:00
> > To: Ton Roosendaal <ton at blender.org>
> > Subject: Re: Fwd: Theora developer question.
> > Reply-To: beornl at ozemail.com.au
> > 
> > 
> > Hi Ton
> > Well, obviously I'm not in a position right now to participate in
> > the online discussion, given my lack of a reliable connection, but
> > here are the commands used to make the 2k ogv:
> > 
> > For the audio:
> > ffmpeg -i input/audio/sintel-master-st.wav -acodec libvorbis -ab
> > 192k -ac 2 output/ogg/tmp-audio-st.ogg
> > 
> > For the subtitles:
> > kateenc -t srt -l en -c SUB -o output/ogg/tmp-subs_en.ogg
> > input/subtitles/sintel_en.srt
> > (and so on for each sub)
> > 
> > For the video:
> > ffmpeg2theora --keyint 250 --framerate 24 -v 7  input/png/%08d.png
> > --title "$title" --artist "$author" --copyright "$copyright"
> > --license "$license" -o output/ogg/tmp-2k.ogv
> > 
> > And to mux it all together:
> > oggz-merge output/ogg/tmp-2k.ogv output/ogg/tmp-audio-st.ogg
> > output/ogg/tmp-subs_en.ogg ....(for all subs)... -o
> > output/ogg/sintel-full.ogv
> > 
> > The thing about the blog post was I outlined exactly what I was
> > doing with the files provided, and was really hoping someone could
> > give me *actual commands* that I could use to improve things.
> > Unfortunately it descended into unproductive bickering about
> > letterboxing vs cropping and which container formats to use.
> > ...and still nobody gave me a usable ffmpeg oggenc or ffmpeg2theora
> > command to make a good ogv file.
> > 
> > In general, I'll admit I'm no encoding expert, but  I found it much
> > easier to generate a high quality, small file size video with h264
> > than with theora.
> > I tried higher quality settings, but the videos blew out to triple
> > the respective h264 size, so I settled on the above settings.
> > Please feel free to pass these comments on. 
> > Cheers,
> > Beorn
> > 
> > 
> >         Begin forwarded message:
> >         
> >         > From: Alexey Fisher <bug-track at fisher-privat.net>
> >         > Date: 8 October, 2010 13:49:04 GMT+02:00
> >         > To: ton at blender.org
> >         > Subject: Theora developer question.
> >         >
> >         > Hallo Ton,
> >         >
> >         > i didn't found best person to contact.
> >         > We discussing currently on theora-dev at xiph.org the ogg
> >         video quality 
> >         > of
> >         > Sintel. Even for theora it is too bad. Can you or some of
> >         your
> >         > technicals send me exact command lines used to encode?
> >         > Or even better participate on discussion
> >         theora-dev at xiph.org with 
> >         > topic
> >         > "too mach distortion on color gradient"?
> >         >
> >         > Regards,
> >         > Alexey Fisher
> >         >
> >         
> >         )
> > 
> 
>