[theora] Re: Quicktime Vs Windows encoding with VP3
dan at on2.com
Sat Oct 19 09:33:41 PDT 2002
the OV codecs you refer to are some Vorbis ACM's that I hacked up to get VPVision to work. Among other sins, they pad out the datarate to allow seeking, since normally AVI files can't deal with variable-bitrate audio. Don't use these codecs for anything but VpVision, please!
Anyway, I cannot say why QT compressions take longer. Maybe something to do with QT itself.
From: Jim Barnes [mailto:tojimbarnes at hotmail.com]
Sent: Sat 10/19/2002 4:08 AM
To: theora at xiph.org
Subject: Re: [theora] Re: Quicktime Vs Windows encoding with VP3
Okay sorry I dont know enough about VBR etc yet but I got that
This is how I came to have the OV codec in win2000
There are three dls at On2 for VP3-Theora on a PC
One for Avi, One for QT, and one comes with VP vision.
When I installed the last of these I suddenly got OV1 2 and 3 as a
selection in the audio codecs in all my editors.
I assume from what you say then that this is an audio only codec and should
only be used as such.
Its just strange that they are in there and they work or at least thats what
the summary of the file under win2k shows. The file shows OV as the audio
codec and VP3 as the video codec.
The interleave was set to one frame and I have no sync problems, just a file
thats bigger when I expected it to be smaller
I used FlaskMpeg to encode both the files
----- Original Message -----
From: "Christian HJ Wiesner" <cwiesner at t-online.de>
To: <theora at xiph.org>
Sent: Saturday, October 19, 2002 5:45 PM
Subject: [theora] Re: Quicktime Vs Windows encoding with VP3
> There is no 'allowed' way of using Vorbis within AVI, because ACM audio
> codecs are only allowed to be CBR, not ABR/VBR. There is a modification of
> Virtualdub called 'nandub' that can mux Lame MP3 VBR/ABR strams into AVI,
> but it breaks AVI specs, playback works only on Windows using MP3 Dshow
> filters and in mplayer for Linux, all other players on most other OSes
> to keep audio and video in sync AFAIK.
> There was a Vorbis ACM codec floating through the net some time ago, some
> guys reported it works with AVI, but quality is bad and there are severy
> sync problems.
> Please note that the inability to use Vorbis in AVIs was one of the main
> reasons for some projects to start work on replacing AVI with something
> modern, namely the OGM format made by Tobias Waldvogel ( based on Ogg
> framing ) and MCF.
> --- >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.
--- >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.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 9116 bytes
Url : http://lists.xiph.org/pipermail/theora/attachments/20021019/6fd7c795/winmail-0001.bin
More information about the Theora