Producing Pal DVD from mpeg2 hd content

[toni1]

I thik that the one possible cause of voice synchronizing problem is the bit rate type (VBR : Variable versus CBR :constant bit rate ) when file time is too big more than 60 minutes and you use VBR (variable bit rate to reduce file size so it can fit in 4.2 gigas compliant file for dvd burning). Not so sure it has to do with field order (even if Ill keep same field order UFF as advic)

VBR is probably a commplicated process

I'll be doing some testing with the original edited hd file and produce x different Pal files changing one factor at a time

[toni1]

Started to make some detailed cheking on my pal dvd sound synch problem and found out this:
Total duration of video is 72 min 56 seconds
The exact place where sync problem starts is exactly at 60 min 00 seconds. from there on the voice is delelayed few second after the video. Then i can assume that that has to do with VS dealing with the 60 minutes limitsin ( in VBR mode , will try to see if this happens in CBR mode)
Reminder
First step editing UFF original 25MBS file and rendering it to one 25MBS FRAME BASED file( VBR 2 pass) from there I produced a frame based PAL DVD to burn

[etech6355]

First step editing UFF original 25MBS file and rendering it to one 25MBS FRAME BASED file( VBR 2 pass) from there I produced a frame based PAL DVD to burn

Toni1, these are the 2 preferred methods that I use. Take note "Method 1" may have audio sync & arti-fact problems if you edit the video making changes other then simple cuts. "Method 1" is also Mpeg Conversion therefore one glitch in the source mpeg2 file can cause audio sync problems. If you want to edit the video use "Method 2" and perform editing on the DV-Type1 file which is frame accurate editing. I consider "Method 2" to be the most reliable.

2 Methods can be used, either method make VS Project Properties equal to the source material.

Method 1:
1- Import HD-Mpeg2 UFF file (25MBS Constant)
2- Export as SD-Mpeg2 = 720x576, Upper_Field_First, VBR 7000-8000, audio=mpeg2@224kbs
3- Goto "Using the Burning Module"

Method 2:
1- Import HD-Mpeg2 UFF file (25MBS Constant)
2- Export as DV-Type1 = 720x576 Upper_Field_First, audio=pcm,48khz,16bit, stereo
3- Start a new project, import the DV-Type1 file created in step 2.
4- Export as SD-Mpeg2 = 720x576, Upper_Field_First, VBR 7000-8000, audio=mpeg2@224kbs
5- Goto "Using the Burning Module"

Using the Burning Module:
1- This method requires the source materal to already be "Dvd Compliant" video created from "Method 1 or Method 2"
2- Start VS, go directly to "Share -> Create Disk" (DVD Creation / Burning Module)
3- Setup "Preferences" (F6 Hotkey), assign a "Working Folder"
4- Click on the "GEAR" Icon and make sure "Do not convert mpeg compliant video files" is checked ON.
4- Insert the DVD Mpeg2 compliant videos into the timeline.
5. Create Chapters, Menuing & Burn the Dvd.

Notes: UFF = Upper_Field_First

[tyamada]

I suggest you also convert your audio to Dolby Digital, it takes less space and is compatable with more dvd players than mpeg audio.

[etech6355]

tyamada,
He is in PAL Format. I thought that Mpeg was native for dvd's in PAL format.
I also considered possibly a mpeg to mpeg audio conversion may yield better sync rather then a Dolby Conversion.

I do use Dolby 2/0 for NTSC in the US.

[toni1]

Thanks Etech for advice , will be trying with one modification at a time to see whole outcome quality and voice sync ;
But its astonishing stll astonishing to me that sync problem started axactly et 60 min 00