Incorrect audio bitrate in AGK 2.25+

[inman]

Yesterday I tried encoding an MPEG-2 file in AGK (2.25 and 2.26). I used VBR MP3 128kbps setting for audio and started encoding. After the initial steps, it started encoding audio using LAME. But in the DOS screen of LAME, I noticed that eventhough I selected 128kbps for audio, the average bitrate used is 112 and only rarely it went up to 128.

After completing the encoding, I checked the video with GSpot and here is what I got

http://tinypic.com/igewlh.jpg

Notice the audio bitrate. I tried encoding another MPEG-2 file and the audio bitrate was just the same, inspite of selecting 128kbps. I think this might be the problem of the new version of LAME. And I accidentally deleted the log files.

Lenox, can you please verify this?

[len0x]

Well, all I can say that LAME gets 128 bitrate correctly via CLI (and displays that while encoding). I don't follow its development, so I can't say if that's a problem or its supposed to happen like this (remember its ABR, not VBR mode that AutoGK is using - may be behaviour was changed).

[inman]

Okay I agree. The following screenshot will clarify the scenario further.

http://tinypic.com/igl2t5.jpg

Check the audio bitrate I selected in AGK which is visible in its status bar. Now check the LAME window and see at which bitrate is allocation mostly done i.e. which is the average bitrate being used.

[len0x]

I think its worth searching/asking this at HA (hydrogen audio).

[swaaye]

I don't think quality has been perceptively impacted. I like seeing it using a wider spread, assuming it's not horribly broken somehow. :)