Issue exporting ac3 file that adds 5 miliseconds

Audacity Help Forum Windows
1

Hi people
I’m using Audacity 2.0.6 with the plugin FFmpeg 2.2.2 Binary for Windows (avformat-55.dll)
I have the following issue:
When i export an ac3 file and import again, i notice a difference of 5 or 6 miliseconds more.
Yes… i know that the difference is imperceptible but it hurts at sight
http://i.imgur.com/YUWqRnv.jpg
Let me explains with images:
http://i.imgur.com/xXg7C5Z.jpg
At simple view, is hard find the difference
http://i.imgur.com/n3DE8v8.jpg
but when i make a zoom, the difference is too obvious
http://i.imgur.com/Tg1b505.jpg
Are there any fix?
Best regards

2

Production in MP3 has serious problems and this is one of them. It’s nearly impossible to do precise timing. MP3 is part of a video format and has some baggage from that association.

Koz

3

I didn’t know this was an issue with AC3, but like MP3 AC3 is lossy compression. That means when you compress then decompress you don’t get the original data back.

4

Use WAV or FLAC. If the audio is for a movie it may support WAV.


Gale