Audio Delay and other potential A/V sync Issues?

[rkr1958]

Am I handling Audio Delay Correctly? Any potential A/V Sync Issues?
Here's what I'm doing.

1. I'm converting VHS tapes to DVD via VCR to Hauppauge USB2 external capture card.

2. Video is 720 x 480. VBR w/max = 6000 kbps & average determined by run time of the video to fit on a SL DVDR.

3. Audio is MPEG1 layer 2 at 384 kbps. I plan to convert this audio to ac3 at 192 kbps, which gives me a little more bit rate for the video. However, the biggest reason I want to convert is in order to clean it up using Goldware.

4. After capture, I use DGIndex to generate a d2v file and to extract the audio.

5. I then use VirtualDub to open the d2v file w/audio via an avs script and then save the audio as an wav file for cleanup with Goldwave.

6. Here is an example of the avs script that I use,

LoadPlugin(plugin_dir+"DGDecode.dll")
LoadPlugin(plugin_dir+"mpasource.dll")

# source video.
video = MPEG2Source("__20071202_100632.d2v").ConvertToRGB

# load & add audio
audio = MPASource("__20071202_100632 T01 DELAY -44ms.mpa").DelayAudio(-0.044)
# AudioDub(video,audio)
AudioDub(video,audio)

# Get Info (Load file in VirtualDub)
# info()

7. Does my method, as illustrated by the above script, properly account for audio delay?

8. After clean up, including volume adjustment, using Goldwave, I use ffmpeggui to encode the audio to ac3 at 192 kbps.

9. I author using TDA 1.6.

10. In addition whether or not I'm correctly handing the audio delay, are there any other things in my method that might cause audio/video sync issues?

[Soopafresh]

I use Delaycut, which autofixes errors in the .mpa file and fixes the delay automatically as well.

FixMPA.bat

for %%a in ("*.mpa") do delaycut -fixcrc silence -auto -out "%%~na.mp2" "%%a"

Then, add the .mp2 file to the avisynth script WITHOUT delayaudio


Or, you can automate it further, decoding to WAV and normalizing the audio via command line

for %%a in ("*.mpa") do delaycut -fixcrc silence -auto -out "%%~na.mp2" "%%a"
for %%a in ("*.mp2") do ffmpeg -i "%%a" -vn -ac 2 -y "aud-%%~na.wav"
for %%b in ("*.wav") do normalize -l 0 --peak -v "%%b"

normalize.rar