[theora] Updated Vorbis & Theora plugins available for Helix & RealPlayer 10
maikmerten at gmx.net
Sat May 15 05:47:12 PDT 2004
John Kintree wrote:
> Is there someplace where people can download sample video files that are in
> Theora format?
AFAIK there is no such place yet. (keep in mind the bitstream is not yet
> I've seen the trailer for Harry Potter and the Prisoner of
> Azkaban in both RealPlayer 10 and VP6 formats. It looks pretty good with
> both of them at between 450 and 500 kbps. For comparison purposes, it would
> be nice to see the same trailer in Theora format.
For a fair comparison you need a high quality version of that trailer -
transcoding something like "high quality" MPEG4 to Theora will very
likely produce undesired additional artifacts.
Some time ago I did some comparisons using VQEQ test sequences from
media.xiph.org. My personal conclusions: Theora tends to blur the image
when running out of bitrate while MPEG4 (I tested XviD) tends to produce
blocky artifacts. I do prefer blurring - but that´s only my personal
taste. However, it´s important to keep in mind that current
libtheora-encoder is still very VP3´esque and doesn´t use any of the new
format features introduced with alpha3 AFAIK.
There´s a new, experimental implementation (written from scratch)
which implements those new features and will very likely produce
superiour results once it´s ready. (At the time being the encoder is
broken, "producing pretty horrible quality files with high bitrates")
EN: Every mail bigger than 35 KByte will be deleted automatically from
my mailbox. Please contact me before sending any attachments.
DE: Jede Mail größer als 35 KByte wird automatisch aus meinem Postfach
gelöscht. Bitte kontaktieren Sie mich, wenn Sie Anhänge schicken wollen.
--- >8 ----
List archives: http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'theora-request at xiph.org'
containing only the word 'unsubscribe' in the body. No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.
More information about the Theora