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Re: Theora vs H264: A visual comparison

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____/ Homer on Thursday 25 Feb 2010 01:01 : \____

> Test subject:
> Star Trek Voyager: Series 2, Episode 17 (Dreadnought) from PAL DVD.
> 
> Tools:
> MPlayer SVN-r29800-4.4.2 (C) 2000-2009 MPlayer Team
> HandBrake-cli-0.9.4
> ffmpeg2theora 0.25 - Xiph.Org libtheora 1.1 20090822 (Thusnelda)
> 
> Hardware:
> Acer Ferrari 4000 (AMD Turion(tm) 64 Mobile Technology ML-37 @ 2GHz)
> 1GB RAM
> 
> OS:
> Fedora 12 (kernel-2.6.31.6-145.fc12.x86_64)
> 
> 
> Method:
> 
> mplayer dvd://1 -dumpstream -dumpfile \
>    /mnt/scratch/voyager/02x17_Dreadnought.mpg
> # Bitrate: 9800 Kb/s
> 
> HandBrakeCLI -Z "iPod Legacy" -m -I -2 -T -N eng --native-dub -t 1 \
>    -i /mnt/scratch/voyager/02x17_Dreadnought.mpg \
>    -o /mnt/scratch/voyager/02x17_Dreadnought.m4v
> # Max bitrate 1500Kb/s
> # Time: 01:01:57
> 
> ffmpeg2theora --two-pass --optimize -v 10 -V 600 --soft-target 600 \
>    -x 640 -y 480 -a 10 --audiostream 2 \
>    -o /mnt/scratch/voyager/02x17_Dreadnought.ogv \
>    /mnt/scratch/voyager/02x17_Dreadnought.mpg
> # Max bitrate 600Kb/s
> # Time : 01:16:05
> 
> 
> Results:
> 1.8G 02x17_Dreadnought.mpg
> 521M 02x17_Dreadnought.m4v
> 480M 02x17_Dreadnought.ogv
> 
> 60 second clips (fair use terms apply):
> http://media.slated.org/albums/content/video/vclip.mpg (39MB)
> http://media.slated.org/albums/content/video/vclip.m4v (13MB)
> http://media.slated.org/albums/content/video/vclip.ogv (13MB)
> 
> Conclusion: Even at less than half the bitrate of H.264, Theora is very
> close to the same quality. There are some more noticeable artefacts,
> but it seems to have better motion compensation, and of course a much
> smaller file size. Pushing the rate to 700 or 800 Kb/s would bring the
> two even closer still (will keep testing).

I opened these in Kaffeine/xine before even looking at the file sizes or the rest of your 
message (just quick CLI copy and paste). I could sense that ogv was slightly less crisp than 
the mpg, but I knew nothing about the file sizes (until I read your message).

I convert a lot of YouTube videos to Ogg for my site and it typically cuts the size in
half without noticeable degradation in quality.

Sometimes freer it also better.

- -- 
		~~ Best of wishes

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