Quote:
Originally Posted by Deftoner
and each should have a bitrate of about 0.04kbps. Is that correct?
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No, subtitle streams do not have a fixed/constant bitrate; for sections where there's no subtitle in any of the streams the bitrate of all subtitle streams together is 0, and whenever a new subtitle appears in any of the streams, the size of it's RLE compressed bitmap adds to the total bitrate of video + audio (+ overall mux overhead). If the total bitrate (inculding subtitles and mux overhead) exceeds 10.08 MBit/s even once, the authoring fails.
With as much as 24 subtitle streams (and probably all sharing very similar subtitle timing) there might be quite some sharp bitrate spikes in some places... However, I think the problem lies in the video stream's maximum bitrate, see below.
Quote:
Originally Posted by Deftoner
The problem is when i add the subtitle streams to my audio/video streams with an overall bitrate of about 7mbps
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Overall (average) bitrate does not count; it's the
maximum bitrate that counts here.
Try the following: use
Muxman and add your video and all audio streams (no subtitles), and let it mux a dvd. Then post Muxman's log here. It will tell us the maximum bitrate of video + audio + mux overhead so we can see how much spare bitrate there is left for the subtitles.