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LAME high bitrate files in l3codeca.ax
post Jan 4 2006, 15:46
Post #1

Nero MPEG4 developer

Group: Developer (Donating)
Posts: 1218
Joined: 11-October 01
From: LA
Member No.: 267


I found a problem with LAME high bitrate CBR files (256 kbps and 320 kbps only it seems) when playing them back using l3codecx.ax. It happens only when the decoder decodes a frame of silence (where LAME produces some version messages and 0x55 fillup bytes to keep up to a constant bitrate). After that the decoder will not produce sound anymore, but only silence. It also happens when such a silence frame occurs somewhere in the middle of a file.

EDIT: It's not a problem with the ACM filter it's a problem with the DirectShow filter for MP3 decoding that comes with Windows. The version info says: MPEG Layer 3 Audio Decoder version 1.5 (build 50). This filter is called l3codecx.ax, not l3codeca.acm smile.gif

Is this a known problem? Any easy solutions for it? FhG encoded high bitrate CBR files don't have this problem (it fills up with 0xFF and no version messages).


This post has been edited by menno: Jan 4 2006, 16:21
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post Jan 4 2006, 16:33
Post #2

LAME developer

Group: Developer
Posts: 2950
Joined: 1-October 01
From: Nanterre, France
Member No.: 138

We had reports of something going wrong when decoding our high bitrate files in directShow.
However, it was hard to track down as we only knew that something was going wrong with some files and some directshow decoders.
This is at least a precise description of the problem, many thanks.

Right now we have no solution, as we just became aware of the real problem.
Investigation is needed to check if the decoder is chocking on the version string, encoder string, or something else.

If would be very helpfull if you could post a sample file, so other people could try it with different filter versions and report results.
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