Why is it when I use eac3to to extract AC3 audio as AC3, and then extract the same AC3 track as FLAC from a Blu-Ray, the volume on the FLAC extraction is much louder? It's not just this Blu-Ray set either, it seems to be when I extract AC3 as FLAC from any Blu-Ray.

It says clipping is detected, and would need a second pass when extracting as FLAC. Does that have anything to with it? I would think that would lower the volume if thats the case in order to stop clipping.

Do the Blu-Rays normalize AC3 audio or something to lower the volume of a much louder source audio when it is put onto the Blu-Ray? Which one is the correct volume?


Code:
M2TS, 1 video track, 5 audio tracks, 7 subtitle tracks, 0:23:12, 24p /1.001
1: h264/AVC, 1080p24 /1.001 (16:9)
2: DTS Master Audio, 5.1 channels, 24 bits, 48kHz
   (core: DTS, 5.1 channels, 1509kbps, 48kHz)
3: AC3, 5.1 channels, 640kbps, 48kHz
4: AC3, 5.1 channels, 640kbps, 48kHz
5: AC3, 5.1 channels, 640kbps, 48kHz
6: AC3, 5.1 channels, 640kbps, 48kHz
7: Subtitle (PGS)
8: Subtitle (PGS)
9: Subtitle (PGS)
10: Subtitle (PGS)
11: Subtitle (PGS)
12: Subtitle (PGS)
13: Subtitle (PGS)
[a03] Extracting audio track number 3...
[a03] Decoding with libav/ffmpeg...
[a03] Reducing depth from 64 to 24 bits...
[a03] Encoding FLAC with libFlac...
[a03] Creating file "C:\Users\???\Desktop\Encoding\TSM\Episode 1\T3_Audio - English.flac"...
[a03] Clipping detected, a 2nd pass will be necessary.  <WARNING>
[a03] Starting 2nd pass...
[a03] Extracting audio track number 3...
[a03] Decoding with libav/ffmpeg...
[a03] Reducing depth from 64 to 24 bits...
[a03] Encoding FLAC with libFlac...
[a03] Applying -0.14dB gain...
[a03] Creating file "C:\Users\???\Desktop\Encoding\TSM\Episode 1\T3_Audio - English.flac"...
Video track 1 contains 33384 frames.
eac3to processing took 3 minutes, 57 seconds.
Done.