"Ryan S. Thiele" wrote:

> It soulds like the CD itself. What burner software do you use? Try to set
> burner option to File Optimize and not Size Optimize, this will keep your
> files from being fragmented on the CD. Also, it could be the format of the
> video, do you have it faster then 1Mb/s? CD max speed is 1Mb/s no matter how
> fast they claim. I would try lowering bit rate of the video file first. DVD
> max is much highter (3MB/s I believe).
>
> --
> Thiele Enterprises - The Power Is In Your Hands Now!
>
> --
> "hzg***@nopost.com" <hzgt9bnopost***@discussions.microsoft.com> wrote in
> message news:C0F412CA-963F-4133-BF8D-DE1430708B95@microsoft.com...
> Using VS2003, VB.NET,
>
> BACKGROUND
> I have a window forms based application that will be distributed and
> executed directly from CD media. The app contains a TreeView control and a
> WebBroswer (AxSHDocVw.AxWebBrowse) control. The TreeView is populated with
> nodes that when clicked play an audio clip that is stored on the CD and
> navigate the browser control to a specified web URL (also stored on the CD).
> All the web URLs are html documents that were converted from individual PPT
> slides (with animations turned on). Several (17) of the slides (and
> subsequent html pages) have an embedded video object (wmv). The video is
> played when the video object is clicked 1x. Because the video was originally
> embedded in PPT and subsequently converted to html, the click event that
> fires the playback of the video is handled entirely through java script that
> is created by the PPT to html conversion. Thus, my app knows nothing about
> the events in the web pages being loaded (i.e. my does not interrogate the
> MSHTML document object during page navigation/load). The audio clip playback
> starts after the html page load is complete (DocumentComplete event handler)
> - handled directly by my app.
>
> The app is relatively small (~300 kb) but the CD slide content (html, audio
> and video clips) is very large (> 500 Mb).
>
>
> PROBLEM - jerky audio playback on several html pages that have embedded
> video objects..
> For several of the pages (sequentially, the last 12 slides with video that
> are accessed), the audio clip that starts playing after a node is clicked
> does not play smoothly. For these slides, it sounds like the CD read head is
> moving back and forth on the CD, thrashing around trying to buffer the
> html's
> associated video into memory. My guess is that the CPU is getting tied up
> looking for and buffering info from the CD and thus can't stream the audio
> clip continuously. For the other slides with video that don't have the audio
> problem (sequentially, the 1st 5 slides with video that are accessed), there
> is no CD "thrashing" happening - I only hear smooth spinning from the CD (no
> stopping and starting, or jerky read head movement).
>
> Multiple CDs of the app and content have been burned from on several
> different machines with similar results - jerky audio on these 12 slides.
> There seems to be no correlation between the size of the video and/or audio
> playback with the jerky playback - the largest audio and video clips
> combinations on the CD playback without any jerky behavior.
>
>
> CAUSE - buffering? CD writer fragmenting video files?
> When the CD initially spins up, it spins for quite a while - could it be
> that enough info is buffered to playback the 1st 5 videos without having the
> read more from the CD?
> When the problem occurs I can hear the CD drive stopping and starting and
> hear the read/write hear thrashing around - could it be the as the CD is
> burned some of the video files are being fragmented over the CD?
> Does anyone have any ideas as the to source of the problem, and thusly how
> to attack it?
>
>
> I'm pretty well stumped on this problem - so any feedback would be greatly
> appreciated!
>
> Thanks for your attention
>
> -celoftis
>
>
>