Hey Kwaku, On Mon, 2003-06-09 at 22:15, Abrokwah, Kwaku wrote: > I have a beginning to intermediate knowledge of what it entails. > I am currently looking for information on how the various jpeg stream are organized > architectually into the mjpeg file. I am wondering if anyone can point me to > documentation > or a website that talkes about mjpeg and some architecture and implementation.
"MJPEG", do you mean AVI files with a MJPEG stream in them? Well, as I said, that's just MJPEG in an AVI container, do you'd probably want to look through Microsoft's or IBM's RIFF/AVI documentation to get a good fundamental understanding on that. Or do you mean the MJPEG video strwam on itself? (Really, this is as simple as a stream can get, it's just a sequence of JPEG images (in YUY2 colorspace), no special markers, nothing). > I am currently trying to convert YUV still frames to MJPEG. I need to know how others > are approaching mjpeg... ie what are the headers at the beginning of the mjpeg file > and > what are people doing about varying sizes of the jpeg streams. That's what the AVI container handles. Every data chunk in a RIFF file (AVI) is preceeded by an identifying tag (00db for video, 00wb for audio) and then a 4-byte size value with the least-significant byte first (so a uint32_t on little-endian systems). Then the data itself. The data chunks are preceded by the normal AVI header (RIFF header, vids/strf:vids header and auds/strf:auds header). After the data chunks usually comes an index of all the data chunks, though this isn't necesssary. For YUV-to-MJPEG/AVI, we use the yuv2lav tool, you'd probably want to look at the sources there to get a good basic understanding of all this. If you just want to use the tool, take our latest RPM (1.6.1). HTH, Ronald -- Ronald Bultje <[EMAIL PROTECTED]> ------------------------------------------------------- This SF.NET email is sponsored by: eBay Great deals on office technology -- on eBay now! Click here: http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
