Midnight Run (1988) BD Stereo

[wongfeihung]

NTSC dvd 2.0 is better than DE blu-ray.

Really? I assumed because the BD was lossless it would be good.

Sorry to have wasted anyone's time.

Is there a rip of this DVD 2.0 synced to the UHD, may I ask?

[wongfeihung]

I put the two ripped files into Audacity and you can see that whilst the German BD looks normal:

waveforms don't give you much info. you need to be looking at and comparing spectrograms.

I don't know how to do that.

I just thought comparing the two, the UHD looked strangely compressed(?).

The waveforms for a number of other suspected or confirmed downmixes have a similar appearence.

[zoidberg]

Slowing down the video framerate in mkvtoolnix doesn't require re-encoding the video, it just changes the metadata within the .mkv file.

[wongfeihung]

Slowing down the video framerate in mkvtoolnix doesn't require re-encoding the video, it just changes the metadata within the .mkv file.

So which would you slow down the video rate or the audio?

I feel like whichever I choose will be the wrong choice.

[wongfeihung]

OK. I found out how to get a spectrogram.

What are we looking for?

[zoidberg]

You will want to slow the video to 23.976fps (sometimes written as 24000/1001)

[Scavenger]

Changing framerate in MKVToolNix sometimes introduces errors. I prefer to use TsMuxer for that. Maybe eac3to works just as well for that, but I've never used it for video fps changes.

[BusterD]

Ah that's right, eac3to causes sync drift on multi-m2ts playlists, but TSmuxer doesn't.

[wongfeihung]

Sorry, I meant what on the spectrogram would I be looking for to judge whether it's a downmix?

Re. Yarp's comments.

[X5gb]

You have pm wongfeihung.