different volume on aac stream for speech and music?

[Elias]

Originally posted by JoeBG
Haali splitter makes dreams come true :) Yes. However, So far, I've noticed one bug with it. For some reason, the second 5.1 audio doesn't play as it should. The sound is great and everything, but the speech is very, very low. When playing it with VLC the second audio stream plays great. But it's only with this sample I've made.

[bond]

Originally posted by Elias
Yes. However, So far, I've noticed one bug with it. For some reason, the second 5.1 audio doesn't play as it should. The sound is great and everything, but the speech is very, very low. When playing it with VLC the second audio stream plays great. But it's only with this sample I've made. mp4creator leaving the music of stream as is correctly, but changes the speech part of the same stream? cant be ;)

[Elias]

Originally posted by bond
mp4creator leaving the music of stream as is correctly, but changes the speech part of the same stream? cant be ;) I believe you. However, this was with mp4box. Want the sample? And it's the haali splitter that is somehow b0rking the sound, not mp4box, because it plays fine in VLC. Don't ask me why. I'm not making this up.

[bond]

i assume vlc simply does some dialog normalization

[Elias]

Originally posted by bond
i assume vlc simply does some dialog normalization I seriously doubt that. I'm telling you, the file isn't b0rked, haali parser is. Some 1337 h4ckz0rs should have a look at it imo.

[Elias]

Originally posted by bond
i assume vlc simply does some dialog normalization Just checked with Nero Showtime, the 5.1 audio stream plays perfect here as well. Definitely a problem from haali then.

[bond]

Originally posted by Elias
Just checked with Nero Showtime, the 5.1 audio stream plays perfect here as well. Definitely a problem from haali then. maybe neros aac decoder also does dialog normalisation :D

try decoding your .mp4 with faad2.exe which you can get from rarewares and check the volume with that :)

[Elias]

Originally posted by bond
maybe neros aac decoder also does dialog normalisation :D

try decoding your .mp4 with faad2.exe which you can get from rarewares and check the volume with that :) I sent you the 3gp file on irc... you try faad2.exe :D It's btw the same file that has the longer length because of the tx3g.

[bond]

Originally posted by Elias
I sent you the 3gp file on irc... you try faad2.exe :D It's btw the same file that has the longer length because of the tx3g. well when i play it in dshow (with haali's parser and coreaac) the audio seems to play perfectly

also when i play it in quicktime it works great

[Elias]

Originally posted by bond
well when i play it in dshow (with haali's parser and coreaac) the audio seems to play perfectly

also when i play it in quicktime it works great That's because the first audio stream is stereo, and QT can't decode 5.1 so it only decodes the stereo track (yes, it is 2 audio tracks). You sure you've switched tracks in MPC?

[bond]

Originally posted by Elias
That's because the first audio stream is stereo, and QT can't decode 5.1 so it only decodes the stereo track (yes, it is 2 audio tracks). You sure you've switched tracks in MPC? in dshow i tested both audio streams (5.1 downmixed to stereo) with the same correct result with coreaac

are you using MPCs internal aac decoder? what happens if you disable it and/or try playing the file in graphedit

[Elias]

Originally posted by bond
in dshow i tested both audio streams (5.1 downmixed to stereo) with the same correct result with coreaac

are you using MPCs internal aac decoder? what happens if you disable it and/or try playing the file in graphedit Actually, this is THE ONLY mp4 file I've been getting this issue with. Every other mp4 file plays perfect when switching to the second 5.1 audio stream in mpc. I'm using ffdshow-20050312 by celtic druid. Just tried it in wmp 6.4 and it's the same with that one.

[bond]

Originally posted by Elias
I'm using ffdshow-20050312 by celtic druidtry coreaac

i can only repeat that i got perfect playback in qt and with coreaac on your sample


splitted as this doesnt belong to the chapters discussion

[Elias]

Originally posted by bond
try coreaac

i can only repeat that i got perfect playback in qt and with coreaac on your sample


splitted as this doesnt belong to the chapters discussion Did you actually decode the 5.1 stream in QT?

[bond]

Originally posted by Elias
Did you actually decode the 5.1 stream in QT? nope, of course not, but in coreaac

edit: ok, now also tried the 3ivx decoder (with haali and 3ivx parser) and it also plays both streams fine

so i tried three different decoders (faad2, qt and 3ivx) and all play the stream fine

[Elias]

This is definitely weird. I extracted all tracks and changed the order of the audio streams and imported them back. This time, the 5.1 stream is first... it plays fine in MPC at first, but when changing to the stereo stream (that one plays fine too), and then back, the speech becomes lowered. My only conclusion I can make out of all this is that haali for some reason isn't parsing this file as it should. In every other player that doesn't use the haali splitter, it works fine.

[bond]

ok my findings on your sample:
- qt plays stereo stream normally
- bsplayer/MPC with 3ivx and coreaac decoder plays stream normally
- MPC with internal aac decoder plays first stream very loud, when switching to second stream volume gets normal, when switching to first stream again the volume stays normal
- videolan plays first stream with normal volume, when switching to second stream it gets very loud, first stream stays normal when switching back, second stream stays loud

so the question for me is: how did you create these audio streams? if in besweet, did you use any gain settings or dialog normalization?

[Elias]

Originally posted by bond
- videolan plays first stream with normal volume, when switching to second stream it gets very loud, first stream stays normal when switching back, second stream stays loud

so the question for me is: how did you create these audio streams? if in besweet, did you use any gain settings or dialog normalization? That's just it, I didn't use any gain or dialog normalization. I created them with BeLight by using the Nero DLLs.. can't remember what version of BeLight. The reason why VLC plays the second audio stream louder is because it's 6 channels. That's the case with every stereo versus 5.1 stream I've created with BeLight to AAC. So I don't see any problem with VLC. It's like this with Nero Showtime too. And that's how it's supposed to be in comparison every other 5.1 stream I've done.

[bond]

Originally posted by Elias
That's just it, I didn't use any gain or dialog normalization. I created them with BeLight by using the Nero DLLs.. can't remember what version of BeLight. The reason why VLC plays the second audio stream louder is because it's 6 channels. That's the case with every stereo versus 5.1 stream I've created with BeLight to AAC. So I don't see any problem with VLC. It's like this with Nero Showtime too. afaik its always better to use gain and dialog normalization, to get the streams to the same volume

[Elias]

Originally posted by bond
afaik its always better to use gain and dialog normalization, to get the streams to the same volume Why? Isn't it so that the difference in volume is due to the extra channels?

[bond]

Originally posted by Elias
Why? Isn't it so that the difference in volume is due to the extra channels? thats true for multichannel streams extracted from dvd (its not a necessity), i thought you dont want the loudness difference?

anyways if you want to know what causes this in MPC and VLC, you will have to contact their devs

[Elias]

Originally posted by bond
anyways if you want to know what causes this in MPC and VLC, you will have to contact their devs The problem here isn't MPC/VLC. It's haali. I get the exact same sound with Nero Showtime as I get with VLC, which means VLC is working as it should. in MPC, when using the haali parser, I get the exact same lowered sound with wmp6.4/wmp10, which means that the haali parser is b0rked. I don't know why this happens on exactly my computer... but it does.