[ATrpms-users] dvdauthor error

[Jeffrey J. Kosowsky]

Axel Thimm wrote at about 18:43:30 +0200 on Tuesday, January 15, 2008:
 > On Thu, Jan 10, 2008 at 09:01:50AM -0500, Jeffrey J. Kosowsky wrote:
 > > Now, according to the log file (see above), the xml file seemed to
 > > specify a bitrate of "15000000" (or 15mb/sec), which would exceed the
 > > 1080kb/sec limit. On the other hand since the actual recording was 2
 > > hours long and the total length was 2.85GB, the (average) bitrate was
 > > more like 3.1kb/sec (2850000*8/3600/2). So, unless the bitrate is
 > > highly variable (this is an atsc dvb recording), it probably did not
 > > exceed the limit too much.
 > 
 > I think you missed a couple of zeros in the GB :)
 > 
 > E.g. it's more like 2.85 * 1024^3 Bytes (kilo -> mega -> giga).
 > 
 > > So, I'm not really sure what is going on here unless it really is a
 > > bitrate issue with the variable bitrate truly exceeding the dvd max
 > > too often.
 > > 
 > > Any thoughts/advice here...
 > 
 > Does the missing "1000" fix this? At least is seems to bring the
 > numbers in the same order.
 > -- 

You are right - I did the conversion to kilobytes twice :)
i.e. the answer is: 2850000*8/3600/2 kb/sec = 3166 kb/sec = 3.2mb/sec

However, 3.2 mb/sec = 0.4 mB/sec which should not be exceeding the
dvd rate -- an easy way to see this is that a full 2 hours of
recording fit in 2.85GB of space and we all know that a regular 2 hour
mpeg2 commercial DVD movie takes up more than that...

So, while my math was sloppy :), the problem remains unsolved for me
again unless there is huge variability in the bitrate which results in
transitory speeds much higher than 0.4 megabyte/sec. (or so it seems
to me :)