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Audio cuts in and out on certain settings #34

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GarlicToum opened this issue Oct 13, 2019 · 29 comments
Open

Audio cuts in and out on certain settings #34

GarlicToum opened this issue Oct 13, 2019 · 29 comments

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@GarlicToum
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I'm a big fan of the OSSC, and recently got some Carby Component cables for my Game Cube. I've noticed the audio cuts in and out occasionally with various settings on the latest firmware. This same behavior also happened with a PS2 with component a long time back (definitely an older firmware version), and still happens with the PS2 via SCART. Here are the settings that cause me some issues:

  • 480i line 4x (audio cuts every 5-10 seconds).
  • 480i line 2x or 576p line 2x (minutely).

Whenever the audio cuts out, it comes back almost immediately and seems to be tied to the input processing. It doesn't cut out with passthrough.

My TV (Sony XBR55-X900E) doesn't really display 480i Line 3x (a lot of flickering), so I didn't test it. I have not yet tried a 960i/1080i input. The same thing happens when switching to different audio cables on the Game Cube, switching to a different Game Cube or PS2, or using a Wii (w/component out + analog audio). All the rest of my setup (SNES w/dejitter and N64) uses SCART cables and the audio always works great regardless of scaling settings.

I have tried various compatibility settings to no avail:

  • TX Mode
  • HDMI ITC
  • Full TX setup
  • Panasonic hack (even though it's a sony)
  • Downsampling on/off
  • swap left/right
  • ADC gain

Any help/ideas would be appreciated!

@marqs85
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marqs85 commented Oct 14, 2019

Are 240p line2x and 480p line2x then OK? Could you test the problematic modes with another display just to rule out some possible causes?

@GarlicToum
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GarlicToum commented Oct 15, 2019 via email

@GarlicToum
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So, I tried out some things on the GameCube using Swiss to force certain outputs and noticed 480p line 2x still causes the audio to cut in and out. If I set it to 960i line 2x (bobbed) there are no audio issues (this is using Carby component cables).

I'm going to try and get a hold of a PS2 game that supports 1080i and see if that exhibits the same behavior as 960i forced GameCube.

@GarlicToum
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I did get a hold of a PS2 game with 1080i support. In line 2x (bobbed) there were no audio drop outs.

@marqs85
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marqs85 commented Oct 23, 2019

So the behaviour is same on both SCART and component inputs, and on both PS2 and GC, with the following results:

240p x2: OK
480i passthru: OK
480i x2: Occasional issue
480i x4: Frequent issue
480p/576p passthru: OK (?)
480p/576p x2: Issues
960i/1080i x2: OK

The strange thing is that 480i x2 has issues while 480p passthrough not since both should have identical output parameters.

@GarlicToum
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Just tried out the gamecube with 480p passthru and it works fine. I also updated the firmware on the tv and that didn't seem to do anything.

@marqs85
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marqs85 commented Oct 28, 2019

So the problem seems to be tied into certain modes. One thing worth trying with 480i x2 is to set "Default HDMI VIC" to 2 under compatibility opt. before selecting the source on OSSC. That should also make metadata identical to 480p passthrough just in case the TV's decoder relies on that.

@GarlicToum
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I gave that a go and it also didn't seem to work...

@GarlicToum
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Thanks for taking the time to look into it marqs. I'll figure something out to work around the audio issue (either an extractor or a receiver of some kind).

Also, a big thanks for making and developing the OSSC, it is simply the best for retro video gaming.

Feel free to close this ticket, if something comes up in the future, I am willing to test it out.

@PapiFed
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PapiFed commented Mar 31, 2020

I would like to report I am experiencing the same audio cuts problem reported here running fw 0.85a.
More specifically when using 480p x2 with H.Samplerate value of 858.00, let me explain :

  • If I switch to 480p passthru (still maintaining H.Samplerate value of 858.00) audio works perfectly fine.
  • If I stay in 480p x2 mode and change the H.Samplerate value by a few units, audio works perfectly fine but then obviously I get a blurry signal.
  • If I stay in 480p x2 mode and enable Allowupsample2x then change the H. Samplerate value to 857.95 or 858.25 audio works fine.

Tested on both AV1 and AV3 inputs.

I am using a Sony 65XE9005, wondering if it could be a Sony thing since GarlicToum appears to be using a TV model similar to mine ?
It seems to be a combination of 480p x2 mode and particular H.Samplerate that triggers the problem.

Best workaround so far is to set TX Mode to DVI and extract audio from the AV1 out jack (or from the audio splitter jack built into my VGA cable when using AV3) and rest some nice headphones on my head !

Kiitos for all the hard work put into this project @marqs85, hopefully you will be able to nail this one too !

@marqs85
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marqs85 commented Apr 1, 2020

Audio issues (not just this one) indeed seem to be much more common with Sony's devices than with others. I'll look into it if I have a chance to test some of these problematic models in future.

@PapiFed
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PapiFed commented Apr 2, 2020

Thanks for getting back to me, much appreciated.

@lucasbrock84
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Hey. I’m new to the OSSC world, and similarly am having audio cutting issues with a GameCube, running Carby cables, to a Sony XBR49X900E. Trying to run at 480p doubled.

@PapiFed
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PapiFed commented Jun 3, 2020

Several other users reporting the same problem on VGP forum.

@tmenzzz
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tmenzzz commented Apr 16, 2021

sony x900h is also doing this. 480p 2x has audio dropouts.

@marqs85
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marqs85 commented Apr 19, 2021

Does this issue occur on firmware v0.81? Some people have reported audio incompatibilities on later fw versions which might be related to this.

@lucasbrock84
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lucasbrock84 commented Apr 19, 2021 via email

@danilodequeiroz
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danilodequeiroz commented Apr 25, 2021

I 'm having the exact same issue with my OSSC on a TCL 49c2us, when outputting 480pX2 or 480iX4, the audio cyclic cuts, the only workaround is to use respectively pass through for 480p and 480iX2 instead or use the P2 audio jack with some external speaker. The issue doesn't happen on my secondary LG 1080p TV which looks like to be some way "tolerant" to this audio signal anomaly.

@GarlicToum
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@marqs85, I went ahead and tried 0.81, and had the same audio cutting in and out.

@retrocats
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retrocats commented Apr 27, 2021

i know sony x900h was already mentioned, but just adding that i have the same issue with the same tv. using dreamcast, with vga cable and wii with component cable.

@JomSpoons
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JomSpoons commented Jul 20, 2021

Also have a Sony TV and this issue occurring. Would appreciate if a fix could be worked out in the foreseeable future, it gets distracting during gameplay.

edit: My TV model is XBR-55X800E if that helps things at all

@siwy102
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siwy102 commented Aug 10, 2021

Hello,
Also have sony TV (43XE7005) And the same issue with audio cut offs,
using ps2 pal, x1 x2 works fine, x4 cuttong off audio
xbox classic ntsc x1 works fine, x2 cutting off
Gamecube x1, x2 ok, x4 not ok
As i noticed in x4 mode in game gran turismo 4 it dropping off audio in specific moments, on fast corners and near audience, yes really! I hope it will help thanks.

@PapiFed
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PapiFed commented Sep 2, 2021

Not sure if this can help in any way but using a Retrotink 5x does not present this problem.

@marqs85
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marqs85 commented Sep 2, 2021

@siwy102: so there is some relationship between audio frequency and occurrence of this issue? Sounds very strange, but I had similar problem with a PC sound card 20 years ago.
@PapiFed: it doesn't really help unless RT5x outputs exact same timings which I highly doubt. It'd be to good if someone could create a custom modeiine with PC with matched 960p timings and test if the issue replicates. That would confirm it's a problem with how Sony sets handle this mode.

@TsukikoChan
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Hi, sorry to res this old bug but was a fix or mitigation ever found for 480x2 on sony tvs?

To add to the old thread I have a 55x900e as well, ossc on .89a fw (1.5ossc with audio mod), packapunch rgb dreamcast cable using 480p setting, pal dreamcast and i get audio drops.

@lucasbrock84
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lucasbrock84 commented Dec 14, 2023 via email

@marqs85
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marqs85 commented Dec 14, 2023

Has any Sony owner tried the v1.xx series firmware/mod?

@TsukikoChan
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I haven't yet, i need to do the soldering on mine first and then i can try the firmware. I'll be able to over the xmas period and i'll report back for my dreamcast 480p2x

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