HE-AAC in mkv problems

[datascab]

Hi,

I just used RealAnime to make a nice movie clip with RV10 and HE-AAC 128k stereo audio.

I can play it ok in MPC in its *.rmvb container... but I put it in the mkv container, checking the AAC box for SBR etc and when I play it in MPC it wont play.

Specifically.... with CoreAAC latest... MPC crashes with error relating to coreaac.ax

With 3ivx it doesnt crash but the file doesnt play and just sits there.

I think the audio is RACP-2, maybe Sirber can confirm this?

Thanks

Data

[datascab]

I see from what Sirber tells me that this a bug...

Any ideas when it will be supported please?

Thanks

Data

[Sirber]

the codec is rapc (Real HE-AAC). In MKV, there is framedrop like before last MPC.

[zyrill]

i have a very similar issue: i can mux an (audio-only) mp4 file containing he-aac in mkvmerge GUI 0.8.4 but whenever i try to play back the resulting .mkv my players tell me that there were no compatible playback filters found... i do have an AAC-codec installed though...

[datascab]

Well i stopped using real aac now.

I use RV10 and nero he-aac 48khz.

Reduces the file size of a 5.1ac3 to 50%.

With the aac from the mp4 in the mkv, all you need is coreaac.

its on rarewares

HTH

Data

[zyrill]

thanks... now it works :D only problem is that audio and video arent synched but that's the dvds fault. :angry:

[[Toff]]

Originally posted by datascab
Specifically.... with CoreAAC latest... MPC crashes with error relating to coreaac.ax
What version of CoreAAC is it ?
version <= 1.0b8 are known to crash, version 1.0b9 was especially released to fix this crash with RealAudio HE-AAC files.

[datascab]

I'm sure it was b9.

Data

[Snollygoster]

I am trying to mux Nero HE-AAC 5.1 in Matroska (MKV). I have tried pretty much everything from Avi-Mux, MKVtoolNix, Graphedit (all latest versions). I have tried muxing from the MP4 file that contains the AAC files or even tried muxing raw AAC file and selecting the SBR option in the muxers. What happens is:


AviMux Gui:
-AAC+SBR selected: Video plays slow (half speed?), CoreAAC shows AAC+SBR 6 ch and it maps 48000 -> 96000..!

MKVToolNIX:
-AAC+SBR selected: Same as above.
-MP4 with HE-AAC in it: Video plays fine, CoreAAC indicates LC AAC.

Graphedit:
Either MP4 with HE-ACC int or raw AAC (using the aac parser filter from rarewares) created a video that plays fine but CoreACC indicates AAC Normal profile.

In other words whevever the SBR part is enabled video playback is slow. Otherwise it plays fine but no HE-AAC. I read all the FAQs and at least in my case MP4 files do not automaticaly indicate that AAC stream is HE-AAC. I also tried a 2ch HE-AAC same deal.

[Tuning]

Snollygoster, Is your AAC audio shown as HE-AAC in foobar2000 ?

[ashyak]

Hi,

use the presets from the nero dlls for AAC encoding.
The maximum HE AAC CBR bitrate for stereo is 80kbit/sec.
96kbit/sec bitrate and AAC HE does not exists, because HE AAC is for low bitrate!
If you want to encode 5.1 AC3 (e.g. 448kbit/sec) sound, then use the preset portable 50-70 kbit/sec and you will get a 5.1 AAC HE file with ~256kbit/sec.



....cu

[Snollygoster]

My stereo file was 80kbps. The 5.1 one was a 224kbps file. However I have set these values manually in Nero encoder. I am reencoding my AC3 file now with foobar/foo_nero using the presets as you recommend. I will let you know what my results are.

Thank you.

[Tuning]

Originally posted by ashyak
The maximum HE AAC CBR bitrate for stereo is 80kbit/sec.
96kbit/sec bitrate and AAC HE does not exists, because HE AAC is for low bitrate!

Read the FAQ!!:D 114. At what bitrates is the HE-AAC profile used in Nero?

For CBR settings, 96kbps and below use HE-AAC. For VBR settings, streaming profile and below can produce HE-AAC. If your input source is 5.1 aiff , then HE AAC can be produced at 128kbps using Nero.

[Snollygoster]

What about muxing 2 HE-AAC in MKV. One is 5.1 the other one is 2.0. Disk is loading at 100% while trying to play and I only see single frames at whatever scene I scroll.


Muxing 1 HE-AAC works great whichever one from the 2 above. 2 of them together FUBAR.

PS: I am muxing with MKVToolNIX.

[ChristianHJW]

Originally posted by Snollygoster
What about muxing 2 HE-AAC in MKV. One is 5.1 the other one is 2.0. Disk is loading at 100% while trying to play and I only see single frames at whatever scene I scroll.
Muxing 1 HE-AAC works great whichever one from the 2 above. 2 of them together FUBAR.
PS: I am muxing with MKVToolNIX.

Let me get this straight :

Muxing works fine, but playback wont ? What player are you using ? MPC wiht internal or external splitter ? Did you test any other players ?

[Snollygoster]

After lots of tries with muxing 2 HE-AAC files in Matroska (one is 6ch and the other one is 2ch), I can play the first track (the 6ch one) fine, however when I switch to the 2ch one movie plays 2x speed.

I tried both MKVtoolNIX and AVI-Mux.

Any ideas?

[tifay]

Read the FAQ!!

quote:114. At what bitrates is the HE-AAC profile used in Nero?

For CBR settings, 96kbps and below use HE-AAC. For VBR settings, streaming profile and below can produce HE-AAC.
----->
If your input source is 5.1 aiff , then HE AAC can be produced at 128kbps using Nero.
---->

I tryied nero HE AAC VBR at various profiles & I got different size for every profile... so I think that nero don't encode 5.1 HE AAC only in 128kbps....