Entry point warning with VCDXBUILD

[avantsbs]

I've seen discussions on this topic before, but I haven't seen a complete answer yet. When I specify entry points in my XML, usually over half of them generate a warning with VCDXBUILD something like:

++ WARN: requested entry point at 3823.000000, closest possible entry point at 3808.004200

Notice this entry point is 15 seconds off. I have seen them over 30 seconds off. What is causing this and how can I fix it? I use TMPGEnc to encode my files. I load the "Video CD NTSC" template and leave everything else alone. They usually start off as asf files. Once converted to MPG, I will watch it in media player to find where I want the entry points to be.

Any suggestions are appreciated.

Brad

[vitualis]

Wow...

This means that VCDImager can't find a closer Sequence header + GOP + I-frame...

These should come every 15 frames (1/2 second if your MPEG is correct).

I suppose that you could try demuxing your MPEG stream and running the elemental video stream through the MPEG Sequence Header adder proggy, but somehow, I don't think that will work...

Did you set TMPGEnc to close all GOPs when encoding?

Regards.

_________________
Michael Tam

<font size=-1>[ This Message was edited by: vitualis on 2001-07-30 06:38:34 ]</font>

[avantsbs]

I don't think I did set it to close all GOP's when encoding. The options under the GOP tab were set as follows (and this was the default)

Number of I Picture in GOP - 1
Number of P Picture in GOP - 5
Number of B Picture in GOP - 2
Output Bitstream for edit (Closed GOP) - NOT CHECKED
Detect Scene Change - CHECKED
Force Picture Type Setting - NOT CHECKED

To close all GOP's when encoding do I need to check the "Output bitstream for edit (closed GOP)"?

Again, to encode, I simply select the asf file for the video source, select the corresponding wav file for the audio source, load up the "Video CD NTSC" template, and say start.

Thanks for the help!

[vitualis]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR size=1 color=black></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2001-07-30 06:29:27, avantsbs wrote:
To close all GOP's when encoding do I need to check the "Output bitstream for edit (closed GOP)"?</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

Yes. Irritatingly, TMPGEnc still doesn't have the closed GOP box check by default for the VCD templates.

Regards.

[willem]

I see you're into "Chapetering" a VCD. I want to do the same. Could you please post an example XML script and an outline of the steps involved?
I think I have roughly figured out how to create VCD's using VCDXBuild but would like an example.

Thanks in advance.

[avantsbs]

Well, I checked "Output Bitstream for edit (Closed GOP)". I also unchecked "Detect Scene Change" since I also saw that suggested earlier. But, alas, it made no difference. Here is an example warning I received this time:

++ WARN: requested entry point at 1435.000000, closest possible entry point at 1450.515722

That's 15 seconds off! What is going on here?

Again, step by step, here's what I did.
1. I downloaded an asf file with ASFRecorder.
2. I used dBPowerAmp to extract the wav file.
3. I opened up TMPGEnc and loaded the "Video CD NTSC" template. I left everything the same, except the stuff listed above. I then said "Start"
4. I wrote my XML file and then ran VCDXBuild.

Why wouldn't that work? Please help...

Brad

[vitualis]

Okay, either the TMPGEnc stream is wrong (possible to likely) or the VCDXBUILD tool can't handle the stream properly (possible but less likely).

I don't have too many suggestions... Have you tried remuxing your stream with bbMPEG?

Regards.

[avantsbs]

Well, I tried to multiplex with bbMpeg, but it didn't work. I de-multiplexed with TMPGEnc, but when I tried to multiplex back with bbMpeg, it gave em an error on my audio file.

So, in desperation, I tried multiplexing back with TMPEnc selecting "VCD non-standard" as I have read in this forum. Anyway, I still didn't work. My entry points gave me the same errors.