Converting 29.97 MP2 audio to PAL 25fps without re-encoding?

[DRP]

Is this possible? I have a downloaded MPEG1 at 29.97 which I want to convert to PAL so I've demultiplexed it into m1v & mp2 streams. I've got the video bit covered, but can I convert the audio to the new frame rate without re-encoding? Or is this impossible. I know how to do it in GoldWave, but this involves saving out again as WAV and then re-encoding to MP2 again. Obviously I'd like to keep the number of encoding steps to as few as possible.

Can it be done without re-encoding?

[FulciLives]

Is this possible? I have a downloaded MPEG1 at 29.97 which I want to convert to PAL so I've demultiplexed it into m1v & mp2 streams. I've got the video bit covered, but can I convert the audio to the new frame rate without re-encoding? Or is this impossible. I know how to do it in GoldWave, but this involves saving out again as WAV and then re-encoding to MP2 again. Obviously I'd like to keep the number of encoding steps to as few as possible.

Can it be done without re-encoding?

No.

Convert the MP2 to a WAV. Convert the WAV to a new WAV that is the length that you need. Some WAV editors can do this. BeSweet and the BeSweet GUI can do this. Anyways you then take the new WAV with the correct running time and convert it to MP2.

29.970 NTSC MPEG-1 is very tricky when converting to PAL ... in fact it is probably the hardest of the NTSC MPEG formats to convert. So even if it works don't expect the best of quality.

- John "FulciLives" Coleman

[DRP]

No.

Convert the MP2 to a WAV. Convert the WAV to a new WAV that is the length that you need. Some WAV editors can do this. BeSweet and the BeSweet GUI can do this. Anyways you then take the new WAV with the correct running time and convert it to MP2.

29.970 NTSC MPEG-1 is very tricky when converting to PAL ... in fact it is probably the hardest of the NTSC MPEG formats to convert. So even if it works don't expect the best of quality.

Thanks for the answer. I'm very pleasantly surprised by the quality that in fact is possible by doing this conversion. I've got a very poor quality NTSC TV capture in 29.97fps and 352x240 resolution. It is only in MPEG1 format as well - so you get the idea of just how bad it is.

I'm doing an IVTC and re-encode to SVCD format + conversion to PAL 25fps speed. The audio I convert in GoldWave. The end result is surprisingly good! I can't believe how good in fact given the quality of the source. It is not that far away from broadcast TV quality and no jerky motion or audio sync problems either. I'm very pleased.

Thanks again.

[FulciLives]

No.

Convert the MP2 to a WAV. Convert the WAV to a new WAV that is the length that you need. Some WAV editors can do this. BeSweet and the BeSweet GUI can do this. Anyways you then take the new WAV with the correct running time and convert it to MP2.

29.970 NTSC MPEG-1 is very tricky when converting to PAL ... in fact it is probably the hardest of the NTSC MPEG formats to convert. So even if it works don't expect the best of quality.

Thanks for the answer. I'm very pleasantly surprised by the quality that in fact is possible by doing this conversion. I've got a very poor quality NTSC TV capture in 29.97fps and 352x240 resolution. It is only in MPEG1 format as well - so you get the idea of just how bad it is.

I'm doing an IVTC and re-encode to SVCD format + conversion to PAL 25fps speed. The audio I convert in GoldWave. The end result is surprisingly good! I can't believe how good in fact given the quality of the source. It is not that far away from broadcast TV quality and no jerky motion or audio sync problems either. I'm very pleased.

Thanks again.

Well that is kewl I would have thought that it would have turned out with jerky motion in fact I wasn't aware that you could do IVTC on VCD material since the horizontal was only 240 instead of the full 480

- John "FulciLives" Coleman

[DRP]

It appears that you can. It's working for me perfectly here. Add to this is the fact that I'm making a *very* 'X' SVCD as well because I'm making it at 480x288 resolution!! It still plays perfectly in my DVD.

I was getting a slightly jerky playback when I just let my DVD player play it as an NTSC disc doing the conversion on the fly. If I do the IVTC manually myself first though and just get the DVD player to play it as PAL disc - it's perfect.

[aramo]

@DRP

I've been passing on dealing with mpg (ntsc) > PAL as I can never get rid of the jerkyness. Could you post exactly what you've done & tools used to the SVCD forum?

[DRP]

@DRP

I've been passing on dealing with mpg (ntsc) > PAL as I can never get rid of the jerkyness. Could you post exactly what you've done & tools used to the SVCD forum?

To the 'SVCD Authoring' forum you mean? Sure. I can do that for you.