48Khz to 44.1Khz in TMPGEnc

[kinneera]

If you use a 48Khz wav file for input in TMPGEnc and select 44.1 as the encode sampling rate, does it handle the downsampling? Or will this cause problems, such as audio sync issues?

[kinneera]

Someone has to know the answer to this quickie question...? Please?

[orbit7]

it wont handle the downsampling well.,

[kinneera]

It seems odd that there is no mention of this in Sefy's DVD to xVCD guide...

When you say it won't handle it well, do you mean in respect to quality or a/v sync?

[Truman]

Just in respect of quality. But you can downsample the audio with dvd2avi in advance. The other choise is, to use tooLAME instead of TMPG audio encoder.

[kinneera]

Given that the source is Dolby AC3 being decoded to WAV and then compressed to MP2, I figure the quality loss is really no big deal, especially when enabling downsampling in DVD2AVI adds 3(!) hours to the save time for a 1h45min long movie. Definitely much more concerned about A/V sync, as my first encoding attempt produced a file that was badly out of sync at the end. Thanks for the help.

[Vejita-sama]

Might I add that you might want to make a short 1-5min clip where with the 48k audio source. While the S/VCD standard calls for 44.1 downmixing the audio takes a lot of time, and I've found that most DVD players can play a 48k audio source xS/VCD. However, most PC soundcards can not. But I only play SVCDs on my stand alone.

[kinneera]

I guess Soundblaster Live cards handle 48k just fine.

[vitualis]

I would not use TMPGEnc to downsample 48kHz audio to 44.1kHz as the quality is quite poor. Remember, MP2 at 224 kbit/s can be essentially CD quality... Once you've gotten the method ironed out, you'd probably find the quality from the downmixing unsatisfactory.

However, the downmixing will not be the source of the A/V sync problem.

I wouldn't use TMPGEnc to do the audio encoding at all. I strongly suggest you use toolame as an add-on to TMPGEnc.

Regards.