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Sound clipping issue after downmixing bugfix #96

Closed
strich opened this Issue · 12 comments

4 participants

@strich

Hi,

We upgraded the firmware after the downmixing bugfix was applied to the firmware, which appears to have resolved it. Unfortunately there are now some sound quality problems in that the sound is 'clipping'.

Not sure what additional information I can give at this point.

@popcornmix
Owner

What are you running when you get this effect?
Is it clipping (i.e. distortion when loud signals are played, continuous through the track)
Or is it popping (occasional bursts of noise near the beginning and end of track, although can also occur on underruns).

@evilpower

Good work on getting us the elusive central channel. I can confirm the clipping. It's definitely clipping. While playing a .mkv with 6ch AAC audio with omxplayer or xbmc I get a substantial amount of it in louder scenes at any volume setting. I'm using analog as output.

@popcornmix
Owner

Do you have boost volume on downmix set in xbmc?

@evilpower

Boost volume on downmix is disabled.

@popcornmix
Owner

Analogue or HDMI audio?
Do you have an example file that exhibits the problem?

@Seri-

I can also confirm clipping with 7 Channel DTS Sound. Happens with HDMI audio (can't test analogue), boost volume is deactivated, sound output volume doesen't effect the clipping.

@torarin torarin referenced this issue in huceke/omxplayer
Closed

Don't boost on downmix #55

@evilpower

Here is a sample that is not very good, I'll try to make a better one later.
http://goo.gl/N8hi7

@evilpower

Here is another sample. I'm using analogue output.
http://goo.gl/hq8NN

@strich

@torarin Should this issue be closed now as part of the fix in pull request 55 above?

@popcornmix
Owner

@strich Yes, this should be fixed. Have you tested it?

@strich

Tested it last night with a movie scene I know to have failed previously and it all looks good!
May want to wait for @evilpower to confirm as well before closing off.

@evilpower

Confirmed. Sounds much better. Even if your volume setting is a bit too high, clamping works like a charm. Good work!

@popcornmix popcornmix closed this
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