similar to: Ambiguity regarding granule position

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

Hi, If this is true: "Granule Position Information in Ogg Header is a hint for the decoder and gives some timing and position information." So say if granule position is 10000, it means that 10000 PCM samples are encoded in this page approximately. If this is true we can neglect this information, it will not effect the decoding right(but might effect for streaming)? Ravi

Hi! I don't find any detailed information about this in the specification, so I try a question here. If two plain, unmultiplexed Ogg/Vorbis-files are chained into one file, you end up with an Ogg-file with two logical Vorbis streams. When playing this file, would it be correct for a decoder to synchronize the two streams according to the granule position of the Ogg pages (playing them

After trying to find out what to do when no packets complete on a page... i reread the ogg spec and found this... "A special value of -1 (in two's complement) indicates that no packets finish on this page." So i searched through a few files and it appears that the muxer doesn't do this... has this been depracated ? In all cases i can find that this happens the page has the same

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

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,

Hey all, friendly ping :) Any help is much appreciated. On Thu, Jun 18, 2015 at 6:56 PM, Chris Cunningham <chcunningham at chromium.org > wrote: > 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

On Wed, Mar 14, 2007 at 12:23:47PM +0000, Mathias Kunter wrote: > OK, since I only want to read / write the Vorbis comments, I can limit it to the Vorbis header packets. > http://xiph.org/vorbis/doc/Vorbis_I_spec.html stats that the comment header always begins on the second ogg page. Since the length of the precedent identification header is fixed, this even is a fixed offset into the

Hi, I think we can start by defining an official field name at www.xiph.org/vorbis/doc/v-comment.html which is used as a file system link to an existing image file. I suggest the field name to be "PICTURE". What is ogg MNG? Is it a container format for PNG files which should be embedded in OGG files? If I understand correctly, the picture would be placed in a different logical stream

Hello to the people reading this list! I am developing tagging support for ogg vorbis in Nero products and we are currently thinking of supporting cover art in ogg files. What is the current state of proposal for cover art in ogg files? Is this http://wiki.xiph.org/index.php/VorbisComment#Cover_art still the latest information? Regards, Goran -------------- next part -------------- An HTML

Hi, I've seen several implementations of Ogg demuxing that use a zero granulepos to detect headers. However, I do not recall seeing this in the Ogg docs - is this an abuse that happens to work because Vorbis is timed by end granule, or is it a proper way to check ? Thanks

Hi, What are the two granule rates in a fishead packet supposed to be for ? Since each of the streams has a corresponding fisbone packet with its own granulerate in it, and they can be all different, wha does the presentationtime num/den means ? Also for hte basetime num/den, since the UTC time which is also present in fishead seems to be a textual representation rather than a linear count ?

Hi, I have a question regarding Ogg’s multiplexing process. Let’s say we have two logical streams, S1 and S2, which need to be muxed together into one physical stream. On logical stream S1, we have a packet that’s too big and needs to be split into two pages, P1 and P2. On the other hand, logical stream S2 also has a page Px that needs to go out. When these 2 logical streams are muxed together,

OK... i've come across a problem trying to get the granule pos of the start of the page... it's not so crucial with single stream ogg files... but now that i have theora+vorbis in a file, i'm finding that when i seek to a position, i have no way to determine the relative offsets of the different streams at the new seek point and hence the av is out of sync. So given a page, is it

Hi, I've now got another way of encoding granule (oh, not *again*, I hear you cry). I believe it's an improvement over the existing "generic" method, so I'll outline it here for your consideration. Again, it's different from what Skeleton can handle, but it's a simple superset and would be easy to add to Skeleton (and liboggz). It is also compatible with other

Hi, do you still think you need all this, if you are allowed to have equal granulepos on subsequent pages? Conrad. On 18/02/2008, ogg.k.ogg.k@googlemail.com <ogg.k.ogg.k@googlemail.com> wrote: > Hi, > > I've now got another way of encoding granule (oh, not *again*, I hear > you cry). I believe it's an improvement over the existing "generic" > method, so

Vorbose -v reports the following for the beginning of the file: INFO page: Capture pattern OggS, format version 0 Flags: first page of logical stream Granule position: 0x0000000000000000 Stream serialno : 0x490f5cff Sequence number : 0 Checksum : 0xee9c02b9 Total segments : 1 Total packets : 1

I'm hoping this is a new proposal, and not a rehash of something that's already been discussed and shot down. Without logs of the recent IRC discussion there's no way for me to know without asking. When I suggested it in #theora earlier derf_ or AndrewBachmann said that it had already been discussed, so I'm under the belief that this is a new idea. <p>Ok so we've

Hi, I have a question about seeking. In fact, it's more or less a kind of rambling and thinking aloud, circling around a question. I've been wondering how to deal with seeking in a stream, and what to do when seeking in the middle of a set of active events (eg, when several bits of text are supposed to be shown, but you seek after the time when they are first shown, and before the time

On 11-Feb-08, at 2:46 AM, ogg.k.ogg.k@googlemail.com wrote: > For reference, my data packets start with start granule, end > granule, backlink > granule, all 64 bits, so picking the granule is just a simple > constant offset > lookup into the data packet, eg, you replace: > > backlink = granulepos<<32; > > by > > backlink =