M
mfjproductions
Hi,
I have designed a PPT presentation with movies on some of the pages,
and am distributing this on CD with the PPT2003 viewer.
The problem that has been reported to me (from the draft version I
released to my client), is that when they play the movies, the video
plays fine but the audio goes out of sync. With interview footage, the
audio lags such that lip sync goes completely out.
All the movies are encoded using the Windows media 9 format. The bit
rates are quite high (1.99Mpbs), so I thought the problem might be the
speed of their CD drive. However, when they accessed the video files
directly from the CD folder, it played perfectly. Also, apparently when
they copied the contents over to their hard drive, they had a similiar
problem. So it must be something to do with the way that PPT handles
video playback. It didn't really make sense to me that the video would
play back perfectly, without stuttering, yet the audio would lag, given
they are combined in the same WMV stream (audio is encoded at 192kbps
CBR, video at 1800kbps VBR).
When I play the PPT on my system, I have no problems with video/audio
sync, but my system is probably higher-spec than most (3.4Ghz, 1GB RAM,
256mb graphics etc). The computers this program will be used with will
be in high schools and other educational institutions.
Are there any solutions to this problem?
I had noticed that PPT tends to display movies larger than Windows
media player, so I wondered if resizing them down in PPT would improve
performance. Also wondering if perhaps PPT uses a different method than
Windows media player to decode the video stream, and is perhaps having
difficulty because the video portion is encoded with VBR, while audio
is encoded CBR. But I am clutching at straws here and don't know. Has
anyone had a similiar experience or know of a possible solution?
Thanks and regards,
Micheal
Aura International
www.aurainternational.com.au
I have designed a PPT presentation with movies on some of the pages,
and am distributing this on CD with the PPT2003 viewer.
The problem that has been reported to me (from the draft version I
released to my client), is that when they play the movies, the video
plays fine but the audio goes out of sync. With interview footage, the
audio lags such that lip sync goes completely out.
All the movies are encoded using the Windows media 9 format. The bit
rates are quite high (1.99Mpbs), so I thought the problem might be the
speed of their CD drive. However, when they accessed the video files
directly from the CD folder, it played perfectly. Also, apparently when
they copied the contents over to their hard drive, they had a similiar
problem. So it must be something to do with the way that PPT handles
video playback. It didn't really make sense to me that the video would
play back perfectly, without stuttering, yet the audio would lag, given
they are combined in the same WMV stream (audio is encoded at 192kbps
CBR, video at 1800kbps VBR).
When I play the PPT on my system, I have no problems with video/audio
sync, but my system is probably higher-spec than most (3.4Ghz, 1GB RAM,
256mb graphics etc). The computers this program will be used with will
be in high schools and other educational institutions.
Are there any solutions to this problem?
I had noticed that PPT tends to display movies larger than Windows
media player, so I wondered if resizing them down in PPT would improve
performance. Also wondering if perhaps PPT uses a different method than
Windows media player to decode the video stream, and is perhaps having
difficulty because the video portion is encoded with VBR, while audio
is encoded CBR. But I am clutching at straws here and don't know. Has
anyone had a similiar experience or know of a possible solution?
Thanks and regards,
Micheal
Aura International
www.aurainternational.com.au