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2nd June 2004, 14:07 | #1 | Link |
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Ogg Theora has been finalized!
a new video coding format is born!
as reported on the theora maillist the bitstream of the license free theora video coding format of the xiph.org foundation has been finalised! The final bitstream is the same as used in the alpha3 encoder already, which means all streams encoded with alpha3 are compliant to the final theora format and all theora compliant decoders will be able to handle them! Theora Homepage Theora FAQ available compliant theora implementations: - official libraries - reference encoder build (thanks to bill_baroud) - supports only .yuv input and outputs to .ogg - discussion - ffmpeg2theora - reference encoder (supports all formats, handled by ffmpeg, as input), outputs to .ogg - discussion - illiminable dshow filter set (supports theora in .ogg) - discussion - Realplayer10 playback plugin (supports theora in .ogg) - discussion - ffdshow/ffvfw VFW encoder - usable in virtualdub(mod), outputs by default to .avi (no, plz not again ) - discussion - ffdshow dshow decoder, supports playback of theora streams packed in .avi or .ogg Under the "Ogg" name, Xiph aims at providing the community a 100% license free and open multimedia framework, as free and opensource alternative to license requiring solutions, including closed formats (as WM9), but also of course open formats, as the MPEG technologies apart from Theora the Xiph family already includes - Vorbis (lossy audio) - FAQ, - Flac (lossless audio), - Speex (speech) and the - Ogg Container Format, which is the container format specified by Xiph for storing their formats (like vorbis and theora) it deserves our support!
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Between the weak and the strong one it is the freedom which oppresses and the law that liberates (Jean Jacques Rousseau) I know, that I know nothing (Socrates) MPEG-4 ASP FAQ | AVC/H.264 FAQ | AAC FAQ | MP4 FAQ | MP4Menu stores DVD Menus in MP4 (guide) Ogg Theora | Ogg Vorbis use WM9 today and get Micro$oft controlling the A/V market tomorrow for free Last edited by bond; 2nd August 2004 at 15:33. |
28th June 2004, 15:01 | #2 | Link |
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What's the features of theora?
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28th June 2004, 16:57 | #3 | Link |
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hm as its based on vp3, you might find the vp3 bitstream description interesting from here
i dunno in what way theora got extended also no encoder (even the reference one) till now let people play around with different options for fine tuning the encode, but i assume this will change when the first beta release comes out (everything is still alpha3 based, which was very experimental)
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28th June 2004, 18:49 | #4 | Link | |||||
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http://svn.xiph.org/trunk/theora/doc/spec/spec.tex
I have uploaded a PDF-Version (140 pages!) at http://www.speedsurf.to/maikmerten/ Quote:
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Last edited by savage747; 28th June 2004 at 18:55. |
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29th June 2004, 10:23 | #5 | Link | |||||
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Quote:
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also what about b-frames? would it have been possible to add these to theora patent/license-wise? Quote:
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29th June 2004, 12:09 | #6 | Link | |
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Quote:
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29th June 2004, 21:40 | #7 | Link | ||||
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Quote:
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As already pointed out VP6 doesn´t use B-Frames either. It seems ON2 isn`t convinced they are sufficiently efficient/necessary. Quote:
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29th June 2004, 22:46 | #8 | Link |
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bframe require more processing at decoding and is not optimal for HW devices. That's why on2 don't use them.
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7th July 2004, 09:34 | #10 | Link |
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Cool !
I'm actually using ffmpeg2theora that is cool.
Anyway, what about 2-pass encoding ?
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10th July 2004, 14:03 | #12 | Link |
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2 pass is definitely a must when doing dvd backups, still someone has to write a ratecontrol. maybe the one from xvid can be used, its very good and even karl lillevold copied it for using it in rv10!
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Between the weak and the strong one it is the freedom which oppresses and the law that liberates (Jean Jacques Rousseau) I know, that I know nothing (Socrates) MPEG-4 ASP FAQ | AVC/H.264 FAQ | AAC FAQ | MP4 FAQ | MP4Menu stores DVD Menus in MP4 (guide) Ogg Theora | Ogg Vorbis use WM9 today and get Micro$oft controlling the A/V market tomorrow for free |
12th July 2004, 15:31 | #13 | Link |
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2-pass via ffdshow?
Hi bond
Latest ffdshow (from early 2004) bring a vfw interface and include encoding using theora. There you can choose theora with Mode "two-passes 1st pass" and "two-passes 2nd pass", and i once did it on a short clip. There were no errors, but i do not know wheather the theora encoder analysed anything in the first pass and used this for the second pass or not. I just had a playable file in the end with good quality. Furthermore, the pulldown menue "Mode" (containing the encoding mode) is greyed out for some Encoders that only allow one pass encoding like e.g. ffv1, lossless JPEG or HuffYUV. This may indicate that milan actually wants the user to be able to use two pass encoding. Source can tell you more. Hellfred |
12th July 2004, 16:56 | #14 | Link |
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great info, thanks
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Between the weak and the strong one it is the freedom which oppresses and the law that liberates (Jean Jacques Rousseau) I know, that I know nothing (Socrates) MPEG-4 ASP FAQ | AVC/H.264 FAQ | AAC FAQ | MP4 FAQ | MP4Menu stores DVD Menus in MP4 (guide) Ogg Theora | Ogg Vorbis use WM9 today and get Micro$oft controlling the A/V market tomorrow for free |
2nd August 2004, 16:59 | #15 | Link |
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ok i now splitted this discussion from the theora sticky
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Between the weak and the strong one it is the freedom which oppresses and the law that liberates (Jean Jacques Rousseau) I know, that I know nothing (Socrates) MPEG-4 ASP FAQ | AVC/H.264 FAQ | AAC FAQ | MP4 FAQ | MP4Menu stores DVD Menus in MP4 (guide) Ogg Theora | Ogg Vorbis use WM9 today and get Micro$oft controlling the A/V market tomorrow for free |
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