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Old 22nd November 2022, 04:54   #15221  |  Link
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Join Date: Dec 2013
Posts: 13
I have the same encoder version; tried several command lines now but always HE AAC.

C:\Program Files (x86)\eac3to>eac3to.exe d:\test.mkv d:\test.aac -224 -quality=0.5
MKV, 1 video track, 1 audio track, 1 subtitle track, 0:41:47, 48i /1.001
1: h265/HEVC, 1080i
2: AC3, English, 5.1 channels, 448kbps, 48kHz
3: Subtitle (SRT), English
Track 2 is used for destination file "test.aac".
a02 Extracting audio track number 2...
a02 Decoding with libav/ffmpeg...
a02 Reducing depth from 64 to 32 bits...
a02 Encoding AAC <224kbps> with NeroAacEnc...
eac3to processing took 3 minutes, 9 seconds.
Same if I convert to WAV first and several different -quality= options.

ID                                       : 1
Format                                   : AAC LC SBR
Format/Info                              : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name                          : HE-AAC
Format settings                          : Explicit
Codec ID                                 : mp4a-40-2
Duration                                 : 41 min 47 s
Bit rate mode                            : Variable
Bit rate                                 : 224 kb/s
Maximum bit rate                         : 250 kb/s
Channel(s)                               : 6 channels
Channel layout                           : C L R Ls Rs LFE
Sampling rate                            : 48.0 kHz
Frame rate                               : 23.438 FPS (2048 SPF)
Compression mode                         : Lossy
Stream size                              : 66.9 MiB (100%)
Writing library                          : Nero AAC codec
Encoding settings                        : -cbr 224000
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Old 22nd November 2022, 14:23   #15222  |  Link
tebasuna51's Avatar
Join Date: Feb 2005
Location: Spain
Posts: 6,572
Originally Posted by odino View Post
eac3to.exe d:\test.mkv d:\test.aac -224 -quality=0.5
a02 Encoding AAC <224kbps> with NeroAacEnc...
You can't encode to a fix average bitrate (-224) and in quality mode.
eac3to send to encoder only the fix bitrate and it is not enough for LC mode.

Please use only -quality=0.35 to obtain the less bitrate possible at LC mode.

The encoder have a parameter (-lc) to force LC mode but eac3to can't use it, you can use the external encoder with:

eac3to "input" stdout.wav | NeroAacEnc -br 224 -lc -ignorelength -if - -of "output.m4a"

to force LC mode but it is not recommended at all.
BeHappy, AviSynth audio transcoder.
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Old 22nd November 2022, 17:55   #15223  |  Link
German doom9/Gleitz SuMo
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Join Date: Oct 2001
Location: Germany, rural Altmark
Posts: 6,599
Quality based AAC encoding will produce a variable audio bitrate. That's fine, the MP4 and MKV containers can handle that.

New German Gleitz board
MediaFire: x264 | x265 | VPx | AOM | Xvid
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