convert audio VORBIS to AAC HELP?!

[mkvnoob]

i want to covert my video MKV audio file VORBIS to AAC what program should i use ?
i dont want to increase the file size.

[Baldrick]

Maybe popcorn audio converter.

Or avidemux, open mkv, under video choose copy, under audio choose aac. Save as new mkv.

[jman98]

Whatever you encode with, you will need to use the same bit rate or lower than your Vorbis audio is using or you will end up with a slightly larger file.

[richter03]

May be you want to try Drag Drop Convert GUI

But I have a little suggestion about audio codec, if you want really small file go for HE-AAC this one is pretty small size but it's have chance to lose some quality of sound (some of my mp3 song that has bitrate over 320kbps lose their quality when convert to HE-AAC but 128kbps are very perfect) and I don't think AAC will make a size smaller then Vorbis, so I think you should stick with Vorbis if you try to convert it to HE-AAC but it's lose some quality.

Ps. I still haven't chance to try HE-AAC2 since I can't fine any freeware that accept command line

[bat999]

I still haven't chance to try HE-AAC2 since I can't fine any freeware that accept command line

Hi
neroAacEnc is such an encoder (if you consider this to be 'freeware').

Nero AG licenses you to use this software package for personal non-commercial and/or technology-evaluation purposes.
This License does not provide any rights to reproduce and/or distribute this software package in whole or in any part.

But there are several other aacplus encoders out there on the www.

Don't worry about HE-AACv2 though.
It is intended for low bitrates, such as internet radio.

Compare the two tracks attached.


A big difference in quality.

lame test.wav -b 32 test32k.mp3

neroAacEnc -br 32000 -if test.wav -of test32k.m4a

General
Complete name         : test32k.m4a
Format                : MPEG-4
Format profile        : Base Media / Version 2
Codec ID              : mp42
File size             : 125 KiB
Duration              : 30s 232ms
Overall bit rate mode : Variable
Overall bit rate      : 33.8 Kbps

Audio
ID                    : 1
Format                : AAC
Format/Info           : Advanced Audio Codec
Format profile        : HE-AACv2 / HE-AAC / LC
Codec ID              : 40
Duration              : 30s 232ms
Bit rate mode         : Variable
Bit rate              : 32.6 Kbps
Maximum bit rate      : 37.4 Kbps
Channel(s)            : 2 channels / 1 channel / 1 channel
Channel positions     : Front: L R / Front: C / Front: C
Sampling rate         : 44.1 KHz / 44.1 KHz / 22.05 KHz
Compression mode      : Lossy
Stream size           : 120 KiB (97%)
Writing library       : Nero AAC codec 1.5.4.0
Encoding settings     : -br 32000

[richter03]

Thanks bat999, but seem like Vorbis still beat HE-ACC v2 in default setting

I encode without setting bitrate so this is bitrate the encode program suggestion.

Format                                   : OGG
File size                                : 3.72 MiB
Duration                                 : 4mn 43s
Overall bit rate mode                    : Variable
Overall bit rate                         : 110 Kbps
Album                                    : Kyoukai Senjou no Horizon II ED Single -Side SunRise- - Sora no Uta
Track name                               : Sora no Uta
Track name/Position                      : 1/4
Performer                                : Okui Masami
Genre                                    : Anime
Recorded date                            : 2012
Writing application                      : Lavf54.25.104

Audio
ID                                       : 2620846843 (0x9C36F2FB)
Format                                   : Vorbis
Duration                                 : 4mn 43s
Bit rate mode                            : Variable
Bit rate                                 : 112 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 KHz
Compression mode                         : Lossy
Stream size                              : 3.78 MiB
Writing library                          : Lavf54.25.104

Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42
File size                                : 3.79 MiB
Duration                                 : 4mn 43s
Overall bit rate mode                    : Variable
Overall bit rate                         : 112 Kbps

Audio
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : HE-AACv2 / HE-AAC / LC
Codec ID                                 : 40
Duration                                 : 4mn 43s
Bit rate mode                            : Variable
Bit rate                                 : 111 Kbps
Maximum bit rate                         : 126 Kbps
Channel(s)                               : 2 channels / 1 channel / 1 channel
Channel positions                        : Front: L R / Front: C / Front: C
Sampling rate                            : 44.1 KHz / 44.1 KHz / 22.05 KHz
Compression mode                         : Lossy
Stream size                              : 3.77 MiB (99%)
Writing library                          : Nero AAC codec 1.5.4.0
Encoding settings                        : -q 0.50 -hev2

[bat999]

... Vorbis still beat HE-ACC v2 in default setting

Hi
HE-AACv2 is used for very low bitrates eg 24Kbps - 32Kbps.
HE-AAC is used for low bitrates eg 48K - 72Kbps.
AAC-LC is used for higher bitrates eg > 72Kbps.

Nero will decide.

neroAacEnc -help

Note that the above switches (-lc, -he, -hev2) should not be used; optimal AAC profile is automatically determined from quality/bitrate settings when no override is specified.

[richter03]

Oh, I don't know about that.
Thanks again, bat99

Ps. 24kbps seem lose some quality so I use 32kbps as minimum.