Tool to detect AAC-LC or HE-AAC?

[rakf1]

Is there a tool to find out if the audio associated with mp4/h.264 video in mp4 container is AAC-LC or HE-AAC?

[Kurtnoise]

MediaInfo.

[dimzon]

foobar2000

[Kurtnoise]

Since when fb2k is a video player ?

[dimzon]

Since when fb2k is a video player ?
It's audio player but it can play audio track from mp4 container.
And fb2k detects AAC profile very well bcz it use information from decoder (FAAD2)

[Kurtnoise]

Read rakf1's question carefully...

[dimzon]

Is there a tool to find out if the audio associated with mp4/h.264 video in mp4 container is AAC-LC or HE-AAC?
Actually it's possible to open mp4 in fb2k and investigate actual AAC profile via properties dialog.

http://img147.imageshack.us/img147/829/1yc1.png

[quake74]

I am doing some tests using NeroAacEnc. Mediainfo always says AAC LC, whether I force LC, HE, or HEV2. Foobar actually gets it right.

[Kurtnoise]

because probably you don't have the right dll...

Plus, fb2k is not accurate with Apple AAC files. But this is an other story.

[quake74]

because probably you don't have the right dll...

Plus, fb2k is not accurate with Apple AAC files. But this is an other story.

My previous tests were done with the 0.7.3.1 mediainfo gui (20060730 dll). Using the latest (I could find) 20061120 dll (the one with the CLI version), mediainfo does distinguish btw LC and non-LC, but it does not differentiate the HE from the HEV2 file.

[SeeMoreDigital]

Is there a tool to find out if the audio associated with mp4/h.264 video in mp4 container is AAC-LC or HE-AAC?MP4box and YAMB 1.6 (in "Extract" mode)

[smok3]

mp4box -info file.mp4 ?

[quake74]

mp4box -info file.mp4 ?

Same as mediainfo, it detects SBR but not PS, i.e., picks out LC but does not distinguish HE from HEV2.

[rakf1]

I had the same experience with mediainfo, it always shows AAC-LC...

[numaios]

Same as mediainfo, it [YAMB] detects SBR but not PS, i.e., picks out LC but does not distinguish HE from HEV2.If you analize a HEv2 file with YAMB, it will report it as "1 Channel(s)", so you can be almost sure that it is encoded with PS, because mono files are very rare. And if you play it with Winamp and "stereo" flashes, then you can be 100% sure it is HEv2.

[rakf1]

I found a way to find out if audio in mp4 is AAC-LC or HE-AAC using the Nero Showtime player.... it shows "AAC" in player for AAC-LC and "AACh" for HE-AAC....

But is there a tool that will give more details of whether it id HE-AAC v1 or HE-AAC v2....

http://static.flickr.com/104/313735262_8e98bdeb82_o.jpg

[Kurtnoise]

mediainfo does distinguish btw LC and non-LC, but it does not differentiate the HE from the HEV2 file.

MediaInfo Version 0.7.4.1 2006-12-08
.......
+ MPEG-4 AAC Parametric Stereo (SBR-PS) detection

:)

[rakf1]

yes, Mediainfo 0.7.4.2 works...so does foobar2000...

they dont actually show as HEAAC or HEAACv2, but shows the SBR and PS...

AACLC = AAC
HEAAC = AAC + SBR
HEAACv2 = AAC + SBR + PS

[Thunderbolt8]

what does heaacv2 aka ...+PS mean ? whats the difference to the normal heaac/aac+sbr ?

btw. I used neroaacenc with megui with the heeac-multi-channel-128 profile with keep original channels on a 5.1 AC3 audio file. as result my file always has 8 channels (according to vlc and winamp, though mediainfo says 6 channels), why is that, when the source has only 6 ones?
eww, and I just noticed that media info shows me aac LC-sbr for that file, while the megui profile clearly said aac HE+PS and not LC.
what is right now ? (nero version said to be from mai 26th)

[nurbs]

LC-AAC + SBR = HE-AAC
Don't know about your 8-channel problem. I am not even sure if the nero encoder does PS for more than 2 channels.

[rakf1]

PS (Parametric Stereo) is supposed to increase the coding efficiency by parameterizing the stereo image of an audio signal

You can use Mediacoder (http://mediacoder.sourceforge.net/) to encode HEAACv2, it uses Nero AAC Encoder.....

www.ebu.ch/en/technical/trev/trev_305-moser.pdf (www.ebu.ch/en/technical/trev/trev_305-moser.pdf) -> this doc has details on HE-AAC v2

[Thunderbolt8]

another strange this is although it says 6 or 8 channels, I dont have the option to choose 5.1 channels any more, only stereo or the 2 left 2 right option. if I cant set it to 5.1 any more, what use is it then to have more channels than with stereo ?