MP4 with MPEG audio - script problem

[pooksahib]

Hi. I want to make a vid with a small scene repeated a few times. With an mp4/AAC, this is what I use:
LoadPlugin("E:\MeGUI\tools\lsmash\LSMASHSource.dll")
a=LSMASHVideoSource("E:\vid.mp4")
b=LSMASHAudioSource("E:\vid.mp4")
audiodub(a,b)
Spline64Resize(640,360)
x=trim(6394,6813)
last++x++x

Unfortunately, I've a vid here with 'MPEG Audio (Version 1) (Layer 3)' and the above doesn't work. My googling hasn't helped so I'm hoping someone can tell me what I need to do with this script. Thank you.

[hello_hello]

Your script should produce the enitre video, with a small section repeated twice at the end. I'm pretty sure. The video/audio format shouldn't matter. If you want just the small section repeated three times, try

audiodub(a,b)
Spline64Resize(640,360)
x=last.trim(6394,6813)
x++x++x

Or

audiodub(a,b)
Spline64Resize(640,360)
trim(6394,6813)
x=last
x++x++x

Or

audiodub(a,b)
Spline64Resize(640,360)
Trim(6394,6813)++Trim(6394,6813)++Trim(6394,6813)

Which is the same as

audiodub(a,b)
Spline64Resize(640,360)
Trim(6394,6813)\
++Trim(6394,6813)\
++Trim(6394,6813)

Avisynth has a function EnsureVBRMP3Sync, but I think it's only applicable to AviSource.



Or you could encode trim(6394,6813) once with the audio, make a couple of copies of the output file, then append the original encode and the two copies together.

[Bernix]

I think, mp3 with this script will work in virtualdub, but it doesnt help you I think

Bernix

[pooksahib]

Good morning, guys. It's not the editing that's the problem, It's getting MeGUI to load the script. It says 'no valid audio frame'. Should LSMASH work for MPEG audio or do I need to load the audio via some other route?

[Bernix]

in virtualdub you neednt do anything with audio so this
a=LSMASHVideoSource("E:\vid.mp4")
Spline64Resize(640,360)
x=trim(6394,6813)
last++x++x

should work

Bernix

[hello_hello]

L-Smash should work for MPEG audio. Maybe the file is corrupted. Try remuxing it with MKVToolNix or an appropriate muxer, see if it remuxes without error, then index the new file.

Havc you tried opening the script with something else? That's the first thing I do when there's problems, to see if the error remains or goes away. I'd usually open it with MPC-HC.

[pooksahib]

Well, the script does indeed fail elsewhere (avspmod). I tried vdub, it seemed to be working but the file it produced wouldn't play and had no audio according to mediainfo.

I've converted the file with toolnix and the indexing of it gave me this script:
LoadPlugin("E:\MeGUI\tools\lsmash\LSMASHSource.dll")
LWLibavVideoSource("F:\vid.mkv")


Which I amended to this:
LoadPlugin("E:\MeGUI\tools\lsmash\LSMASHSource.dll ")
a=LWLibavVideoSource("F:\vid.mkv")
b=LWLibavAudioSource("F:\vid.mkv")
audiodub(a,b)
Spline64Resize(640,360)

and it's now loading fine. Many thanks. Don't know what I'd do without y'all.