search for: muxer

Hi all, I am trying to test DirectShow PushSource example from the SDK with Theora encoder and Ogg muxer (DirectShow filters of course) by using GraphEdit tool. My goal is capturing the screen as video by taking snaphot bitmaps continuosly (what PushSource eaxmple does) and giving them to the Theora encoder through the DS pipeline (next goal is transmitting this video **). My DirectShow graph is like...

(Cross posted to theora-dev@xiph.org and ffmpeg-devel@mplayerhq.hu) I am working towards adding Theora encoding support to libavcodec in FFmpeg. I am doing this by simply calling libtheora from libavcodec. I am at the point where I can execute: "./ffmpeg -v 100 -i test.wmv -f avi -an -vcodec theora -b 1000000 -y test.avi" I get some whirring and an output file written. My calls to

...mean, decoder doesn't asks me for more samples. but if i send this first packet to decoder, i got 'division by zero' exception inside decoder (i don't found exact place where it occurs still, so may be this a root of evil). i've tested encoder and decoder filter with ogg file muxer/demuxer - all works ok. and i don't found any special or magic code inside it. so may be someone have any ideas why it doesn't work? -- best regards, Leonid.

...; implementations (in C) of this yet anywhere?  > Sorry that should say RTP, not RLP I am not sure I understand exactly what you are asking, but libavformat has a RTP packetizer that works for both Vorbis and Theora, implemented in rtpenc_xiph.c. But this packetizer is meant for use in the RTP muxer of libavformat itself, and the RTP muxer relies on the packet's metadata, that, when it comes from libvorbis, is derived from the fields of the ogg_packet structure. Thus, you still need that ogg_packet structure anyway. Regards, -- Nicolas George

But is there any sound player for windows that plays speex in an ogg container? One more question, besides the source code found in the speex site (like speexenc.c) can you tell me where to find source code developed in C++ (using object oriented programing) that makes it easier to write ogg files with speex content? Miguel Gomes -----Mensagem original----- De:

>From some random dude on Slashdot [ http://yro.slashdot.org/comments.pl?sid=224420&cid=18177356 ]: "Second, whether AVI is better or worse than Ogg is debatable. Any who has ever written an Ogg (de)muxer curses it's name frequently. It's extremely codec-specific, and the format is rather loosely defined, with no consistent standard way to do much of anything.... AVI has it's limitations, but they are few. Most of the problems people experience with AVI is due entirely to limited softwa...

>From some random dude on Slashdot [ http://yro.slashdot.org/comments.pl?sid=224420&cid=18177356 ]: "Second, whether AVI is better or worse than Ogg is debatable. Any who has ever written an Ogg (de)muxer curses it's name frequently. It's extremely codec-specific, and the format is rather loosely defined, with no consistent standard way to do much of anything.... AVI has it's limitations, but they are few. Most of the problems people experience with AVI is due entirely to limited softwa...

Hi, I've been studying the Opus code and documentation for a while and have seen it mentioned several times that Opus uses pre-skip to allow the codec to converge. What convergence are they referring to? Rate control? Energy envelope prediction after seeking? Is there a discussion of this somewhere? Also, I'm also interested in the seeking behaviour of the decoder. If, say, I want to

...tion after seeking? > > Not rate control, but there are a number of predictors running in the > decoder which need some amount of data to converge with their expected > values when the encoder and decoder would be out of sync for whatever > reason. > > Pre-skip can be used by a muxer to describe how much data must be run > through the decoder before valid output is obtained at the start of a > file. This could be e.g. 80 ms if the muxer is creating a file from the > middle of another one (lossless editing, webrtc stream recording). > > More commonly it's used...

...nssh code implements TCP-over-TCP for its tunnel support. You might look at that. There are even patches to make it drop the compression so there's no performance overhead. With Ogg, I think oggz is your best bet for a sane library, but you're correct it's more a library-for-writing-muxers than a muxer library. -r

...tle track, often in multiple langauges. Also, re 2. Keyframe seeking in OGM is generally a bit rough because ogm files can contain almost any codec as the video track, usually xvid or divx. re 1. As a general rule you shouldn't be trying to make any more ogm files :) So chances are the ogg muxer is not accepting the connection, because it wants to make OGG files not OGM files. OGM files don't have theora streams (well technically they could, but they almost never do) As for more specifics about gstreamer... i'm afraid i don't know. Maybe there is an OGM muxer. Zen. Silvi...

...is no problem tu mux it in to matroska. My question is: should actually ogg support timestamps, also variable framerate? If yes: it seems to be some where broken. Here is what i use to reproduce my issue: gst-launch-0.10 -e pulsesrc ! queue ! audioconvert ! vorbisenc ! queue ! oggmux name="muxer" v4l2src ! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! theoraenc keyframe-force=1 ! muxer. muxer. ! filesink location=foo.ogg Regards, Alexey

...> > My question is: should actually ogg support timestamps, also variable > framerate? If yes: it seems to be some where broken. > > > Here is what i use to reproduce my issue: gst-launch-0.10 -e > pulsesrc ! > queue ! audioconvert ! vorbisenc ! queue ! oggmux name="muxer" > v4l2src ! > video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! theoraenc > keyframe-force=1 ! muxer. muxer. ! filesink location=foo.ogg here is the answer: On Do, 2010-08-19 at 08:29 -0700, Timothy B. Terriberry wrote: > The Ogg mapping for Theora is fixed-framerate. Yo...

...station). And the two streaming services we've used (which handles royalties as part of the server package) only accept Shoutcast v1 (aka the "admin interface"). So we haven't had the chance to do it the proper way (Ogg stream metadata). While I haven't checked, perhaps a muxer might work? I have not looked into if ffmpeg can act as a (re-)muxer. I'm designing a internal tool that is intended to become a public tool in the future but that is a long way off. What about BUTT (Broadcast Using This Tool), does that not do Ogg metadata? As to your request to add supp...

...works by the way with other codecs, such as XviD. My main issue with other codecs is that they don't expose a COM interface on their encoding end, which allows me to change encoder settings programmatically (hence my interest in Theora). Along those same lines, does anyone know why the Ogg muxer and demuxer only have input pins and output pins respectively? Those filters are used to read/write Ogg streams from/to a file. It would be awesome if the the muxer filter would offer an output node, where it sends out the Ogg stream samples, which I then could intercept using the sample grabb...

...control? Energy envelope prediction after seeking? Not rate control, but there are a number of predictors running in the decoder which need some amount of data to converge with their expected values when the encoder and decoder would be out of sync for whatever reason. Pre-skip can be used by a muxer to describe how much data must be run through the decoder before valid output is obtained at the start of a file. This could be e.g. 80 ms if the muxer is creating a file from the middle of another one (lossless editing, webrtc stream recording). More commonly it's used to account for resample...

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 granule pos as the previous page. Is this a bug in the encoder or muxer or is the spec wrong ? Also when looking more closely the granule pos appears to get out of whack at each point...

...pre-release testing. The major change since last release is the addition of Ogg exporter and Vorbis and Theora encoders. Any feedback on how this new functionality performs (or doesn't!) with audio/video editing/producing software will really help. Also, comments and suggestions on the work of muxer, encoders' configurability, naming or any other missing feature will help and will be much appreciated. There are built binaries available on: http://people.xiph.org/~arek/ Building from sources hopefully should be more straightforward now (compared to previous versions), as well. It should bu...

...pre-release testing. The major change since last release is the addition of Ogg exporter and Vorbis and Theora encoders. Any feedback on how this new functionality performs (or doesn't!) with audio/video editing/producing software will really help. Also, comments and suggestions on the work of muxer, encoders' configurability, naming or any other missing feature will help and will be much appreciated. There are built binaries available on: http://people.xiph.org/~arek/ Building from sources hopefully should be more straightforward now (compared to previous versions), as well. It should bu...

...pre-release testing. The major change since last release is the addition of Ogg exporter and Vorbis and Theora encoders. Any feedback on how this new functionality performs (or doesn't!) with audio/video editing/producing software will really help. Also, comments and suggestions on the work of muxer, encoders' configurability, naming or any other missing feature will help and will be much appreciated. There are built binaries available on: http://people.xiph.org/~arek/ Building from sources hopefully should be more straightforward now (compared to previous versions), as well. It should bu...