SVCDs on a DVDr

[Cartoony]

Lets say I've got 2 800Mb MPEG2 files which are SVCD compliant. I know I can re-encode them to DVD res but, by using DVDpatcher, we know that we can fool DVD authoring software into accepting 480x480 files (with 48k audio) which my DVD player plays OK. My problem is that whenever I've de-muxed, resampled the audio to 48k, then re-muxed, the lip-sync nearly always goes out.
So what I've been doing is running the mpeg through ProCoder, leaving the res as it is, but resampling the audio to 48k, & the lipsync always stays OK.
The problem is that, because ProCoder re-encodes the video (even though the res stays the same), it takes ages.
What I want to be able to do is run the file through Procoder to resample the audio, but do a 'direct stream copy' of the video without re-encoding it. This would make it faster, & there would be no quality loss. But ProCoder wont do this - it insists on resampling the video too.
Is anybody aware of a program which can resample an SVCD MPEG file, but directly copy the video element while resampling the audio to 48k. As I said, I know I can de-mux but this invariably causes lipsync problems. Thanks for your time reading this & your anticipated help.

[roach76]

I have done something similar but with PAL movies and it worked fine. I demuxed and then resampled the audio to 48k with SSRC. Problem with this though is that you have to re-encode the audio cause SSRC uses WAV files as the input file. At least re-encoding the audio doesn't take no where near as long as video does.

[hoozdapimp]

here's what you need to do:

demux your svcd files to get your 44khz audio file.

now i use besweet gui to convert your mp2 file to wav.

find out the exact time of your video file...you can do this by opening the file in CCE (by frameserving)..this should give you something like 01:43:22:12 (1 hr 43 minutes 22 seconds, 12 frames). Now if your source is NTSC you would convert the 12 frames part to decimal by dividing by 29.97, if you're PAL, divide it by 25. So in the NTSC case your video time would be 1:43:22.4004. Note, I'm not using CCE to encode anything, simply as a means to find out the exact video length. If you know a better way to do so, feel free to do that.

Now open your wav file in CoolEdit and go to tools->stretch and stretch the audio to the exact video time we just found above.
Save the new wav file.

finally, convert the new wav file to 48khz mp2 using BeSweet.

[Cartoony]

Thank you for those instructions - I'll give them a try over the next couple of days.

[Cartoony]

Did as instructed but the lipsync went out again. What am I missing here?

[daveidmx]

i once had problems where CoolEdit would not stretch to an exact length. Whatever I typed in, it would be off by a few hundred millis in either direction. So I've been using WLA when i need to _very slightly_ change the duration of an audio track.



PS. I modified WLA to work with mono input sources so it can be used on a "six waves" set, if anyone's interested.

[f@chance]

I have done what you are trying to do with numerous SVCDs. If you search for LOTR in the Doom9 forum you find your answers.

1. Demux the MPED2 file into video and audio
2. Use audio tools (Soundforge Batch converter is what I use) to normalize and resample the audio to 48 kHz and save as a WAV file.

3. Convert the WAV file to AC3 using SoftEncode.

3. Use DVDPatcher to patch video to 352x480 to fool the DVD authoring software.

4. I use DVD Maestro to import the video stream.

5. On the associated audio stream with the video stream right click and choose create sync audio track. This will import the AC3 track and sync it to the video stream.

6. Save the project and close it.

7. Open DVD patcher and patch the video stream to 480x480.

8. Open DVD Maerstro again with your project and compile the DVD.

9. Burn it.

the menus and buttons are up to you. No loss of video quality just audio reencoding. The Batch converter is excellent and fast producing WAV files normalized and resampled.

You find everything in this forum to come to a conclusion with your problem or task.

F@Chance