similar to: Vorbis file information.

Form the vorbis.com homepage: "Ogg Vorbis does not compromise quality for freedom. Its stunning quality is coupled with aggressive features like fast bitrate scaling, surround channels, and fast sample-granularity seek and decode." This makes me wonder... -- What is "fast bitrate scaling"? -- I've never seen anything in the source supporting surround channels. -- I

I have a technical question about the vorbis granule position, but I would like to put the question into context. When a ogg vorbis stream is ripped using wget, fetch, or streamripper under Linux or FreeBSD, the resulting file has problems both with granule position and with a missing EOS. I think I can figure out how to add an EOS, but is there a way to determine the granule position in a stream

Question: is it permissible to put more than one frame packet into a page? At 30 fps, Ogg page overhead is on the order of 8 - 10 kbits/sec. At low datarates, this is going to be unacceptable. If I shove a few frames into a page, how does this affect the granulepos stuff? ___ Dan Miller (++,) Founder, On2 Technologies <p>--- >8 ---- List archives: http://www.xiph.org/archives/

Hello, All. I am making an Ogg Vorbis decoder based on Tremor. The Vorbisfile library provides a high-level API which enables us to seek in the file, but it needs to declare a pointer to OggVorbis_File structure. Because I am supposed not to use file, so I can't use the ov_pcm_seek() or ov_raw_seek() functions to seek in the file. For decoding an Ogg Vorbis file, I first put it in

Hi Vorbis-Dev, I'm investigating various WebM/Vorbis bugs in chromium. AFAIK muxing Vorbis inside of WebM does not have an official specification, so I'm using ffmpeg's implementation to try to answer 2 questions: 1. Under what circumstances is it valid to find WebM Blocks containing Vorbis data with zero duration? (This would mean the next Block in the Cluster has the exact

Hi, While building an ogg-vorbis stream encoder, I encountered some problems with silence in the audiostream. The bitrate drops to almost zero, and pages going out less then ones a minute what makes the stream to stop / buffer. In earlier postings I read that I shout use ogg_stream_flush as an alternative to ogg_stream_pageout, in case of silence. My question is this; Is there any

Hello, I'm still working on the native .NET ogg tagging library. It already works well for non-multiplexed ogg vorbis, ogg flac and native flac files. Concerning multiplexed files, I've got two short questions: 1) Is it valid to insert an "empty" page into the stream which simply contains the binary value 0 for the page_segments counter, and which therefore contains no segment

hi guys, first of all, i'd like to ask if there any crossplatform software/service ( gui is also better, an online application like firefogg is great, or at least a command line tools for any platform) to combine theora videos, other than oggcat... i am doing some art projects that people should be able to remix featured theora videos and i find oggcat very usefull in theory but not in

From: Nathaniel Gray <n8gray@gmail.com> Date: Sep 14, 2005 11:30 AM Subject: Newbie q: decoupling vorbis from ogg To: vorbis-dev@lists.xiph.org Hi, Sorry if this is a newbie question. I'm trying to write an OS X AudioCodec for Vorbis using libvorbis. I'm confused about the libvorbis dependency on libogg. I thought the vorbis spec didn't require ogg as the container, but the

Hello learned ogg folks, and welcome to 2007. Sadly I am back at work already, and I'd like to seek your advice. We need to store raw RTP packets on disk as they are received from the network. There will be multiple streams of media--at least one audio and one video--that all need to go in the same file. We have decided to use ogg because it is the simplest container format that meets our

Can I fix the checksum with a hex editor? Sent from my iPhone On Jun 25, 2009, at 3:23 PM, Monty Montgomery <monty at xiph.org> wrote: > Confirmed--- the checksum on the second page (the comment page where > the album art was added) is incorrect. Vorbis players are not allowed > to decode any stream in which one of the setup headers is corrupt, and > a bad checksum counts as

(Sending again after subscribing, I guess the moderator is on vacation.) I'm working on support for tagging Speex files for Mutagen[0] and part of the specification at [1] is confusing me. It says the first page should have granulepos 0 and packetno 0. Does this really mean page sequence number 0, since the Ogg format doesn't number packets? If it doesn't mean page sequence number,

Adam Rosi-Kessel wrote: > Yes, it was Mediamonkey. They claim that it was due to a bug in vorbis > libraries. All software has bugs, but this explanation doesn't really add up. libvorbis is the codec. If they had blamed libogg, which does the container, then yes, that would have been a believable explanation :-). Erik --

> There are a usually lot more data packets than header packets, so > having an internal length there hurts your bitrate a lot more. Of > course, it may not be significant for an uncompressed text codec. If muxed with a video, it's insignificant (well, for my test cases). > With codecs using the 'count of decodable samples' rule to calculate > their granulepos, the

Hi all, I noticed the following Subversion commit today: r6719 | xiphmont | 2004-05-18 16:04:53 +1000 (Tue, 18 May 2004) | 11 lines Updated doc to reflect current proposal... Not as much a proposal at this point actually; this is the way I'm now implementing it. Although we're still in the 'RFC'/'look for horrible lossage' stage, this is close to being

On Sat, 2006-07-15 at 14:35 -0700, Ralph Giles wrote: > On Sat, Jul 15, 2006 at 02:17:22PM -0500, Joe Wreschnig wrote: > > > I'm working on support for tagging Speex files for Mutagen[0] and part > > of the specification at [1] is confusing me. It says the first page > > should have granulepos 0 and packetno 0. Does this really mean page > > sequence number 0,

On 02/05/07, Elaine YueLien <et@ihear.com> wrote: > Hi, > > Several months ago, I asked a question about seeking without a metric. > You can find one answer in this beta release, demonstrated in the > example program multiThreadSeek. There is also an example demuxer, and a > rewriter. Hi Elaine, congratulations :-) that's a nicely designed API you've got there.

So, I abandoned the hope of using the ogg python bindings to do pure ogg container encoding. I started looking at the libogg in the hopes of retooling the bindings to follow a better object model and it actually looks like the problem is down in libogg, not the bindings. Am I crazy or does libogg rely on libvorbis to return ogg_packets, and that there are no functions that will build an ogg_packet

I built ffmpeg2theora from SVN, using libogg 1.1.4, libvorbis 1.2.3 and Thusnelda from SVN. Running ffmpeg2theora --help reports that ffmpeg2theora accepts a range of -2 to 10 for the --audioquality option and a bitrate of 32 to 500 for the --audiobitrate option, but it doesn't appear to actually accept any of the low end numbers. It appears that the lowest acceptable value for

> speex and flac have an "extra headers" field in the bos page, and > skeleton also has a field for recording the total number of headers > (as it's kinda important for editing files). If you know how many > headers there are going to be at the start of encoding, then adding a > field like that might be enough. I do know at start, and I have such a field too. However,