VDM or AviSynth: audio fade in/out

[hollowman]

Using an AVS script in VDM (or VD) I'm trying to fade in/out BOTH the video and an MP3 audio stream (in VDM, I disabled the AVI file's original audio).

However, only the video fades in/out -- not the audio. What am I doing wrong?

Here's the script:

AviSource(".06-06-01_18-06.00_AVS_Lanczos.avi")
FadeIn(30)
FadeOut(30)

[guns1inger]

Fade only does video. There isn't a built in fader for audio in avisynth.

[manono]

Hi-

I don't know for sure, but my educated guess says the fades will work only on WAV audio.

Did you know you're adding 2 frames, one at the beginning and one at the end, by using Fade that way? A more efficient way to do it, and one that doesn't add any frames in case it matters to you, is this way:

FadeIO0(30)

Guns1inger, it works with audio:

The sound track (if present) also fades linearly to or from silence.

http://avisynth.org/mediawiki/FadeIO0

[guns1inger]

Didn't drill down that far. The main index lists it as only affecting video.

[hollowman]

I don't know for sure, but my educated guess says the fades will work only on WAV audio.

Did you know you're adding 2 frames, one at the beginning and one at the end, by using Fade that way? A more efficient way to do it, and one that doesn't add any frames in case it matters to you, is this way:

FadeIO0(30)

Guns1inger, it works with audio:

The sound track (if present) also fades linearly to or from silence.

http://avisynth.org/mediawiki/FadeIO0

Thx for the tip on FadeIO0() -- I've updated my AVS file accordingly.

Is there an AVS command similar to WavSource() for MP3 (I can't find one)?

[gadgetguy]

Is there an AVS command similar to WavSource() for MP3 (I can't find one)?

AFAIK, there's not one built in and I haven't seen a specific plug-in for it, but if you have a Direct Show codec for MP3, then it can be opened with DirectShowSource(Video = false). At that point it will be uncompressed audio and once it's AudioDub()ed with video, fadeio0 should work on it.