KeyFrame and Switching delay
- From: "HanKyu Park" <hankyuparkspam-msnews@xxxxxxxxxxx>
- Date: Fri, 20 Jan 2006 23:16:01 +0900
Hi all,
I'm trying to reduce the delay while switching media on the vod service
using server list.
What I want to know is that the delay is related to whether the position of
'clipBegin' of Media-B is KeyFrame or not
when switching from Media-A to Media-B.
(sorry for my poor and long english)
To investigate, I tested following 2 cases.
case1) Check the keyframe interval of wmv file
I judged that the frame is a keyframe
if the return flag of ISyncReader.GetNextSample( ) is CleanPoint.
The test result said that all of frames are keyframe. (T-T)
case2) Check the delay when we make the playlist like following.
-------------------------------------------
. ClipA, clipBegin(0sec 1frame), clipEnd(5sec)
. ClipA, clipBegin(0sec 2frame), clipEnd(5sec)
.......
. ClipA, clipBegin(0sec 23frame), clipEnd(5sec)
. ClipA, clipBegin(1sec 0frame), clipEnd(5sec)
-------------------------------------------
The test result said that the dealy is smaller than 1 sec regardless of
clipBegin.
FYI, The wme profile is like following.
Parameter
Value
Total Bit Rate
1499 Kbps
Video Encoding Mode
CBR
Video Codec
WMV 9
Video Size
640x480
Audio Encoding Mode
CBR
Audio Codec
WMA 9.1
Video Bit Rate
1362 Kbps
Audio Format
128 Kbps
48 Khz
Stereo CBR
Frame Rate
24 fps
Key Frame Interval
1 sec
Buffer Size
2 sec
Video Smoothness
80
Decoder Complexity
Auto
My questions are these.
Q1. Can I trust the result of test case1?
Q2. Is there anybody who can tell me the effect of clipBegin on the
switching delay?
.
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