OSSC Pro Downscale – Strange Issue

[GeorgeSpinner]

I just got an OSSC Pro this week. It is replacing my original OSSC. I’m looking forward to many happy years with it.

I have the OSSC Pro HDMI output going into an HDMI splitter. The  HDMI splitter goes to my LG OLED and my Sony CRT (via Portta HDMI to Component converter).

The purpose of this is to downscale the my Midway NHL2 on 2 Open Ice JAMMA PCB because the Sony CRT does not like the 54hz sync and the image rolls.

The downscaled image is beautiful. The only issue is that there’s no sound on the CRT… Sound on the OLED is fine.

Why is this issue “strange”? because I had the exact same setup with my original OSSC, except instead of going into the Portta HDMI to Component converter it went into a cheap HDMI to S-VIDEO converter. The image was interlaced but it worked well enough and there no issue with the audio.

I tried connecting the OSSC Pro to the HDMI to S-video converter and there’s also no audio. Every device I’ve tried with the OSSC Pro behaves this way with the CRT.

I have other scalers. I have used them in the same setup mentioned above.

I have a GBS-Control. I have used that with the Portta HDMI to Component converter and it works well enough (after some effort) and has audio on the CRT.

I also have a RetroTink 5X. I have used the RT5X to downscale other PCBs and the audio is fine on both displays. The RT5x will not downscale the Midway NHL 2 on 2 Open Ice PCB; so, it’s not an option (and it’s the reason I purchased the RT5X; lucky me).

Of course, I first assumed the audio was not making it to the Portta HDMI to Component converter. But the other scalers proved this isn’t the case.

I tried connecting the OSSC Pro directly to the Portta HDMI to Component converter and the HDMI to S-Video Converter. Same result. No Audio.

I can’t, for the life of me, imagine why the OSSC Pro has no audio output on the Sony CRT. But maybe someone knows something that I don’t.

As an aside, the OSSC Pro is replacing all of my other scalers/line-doublers. The GBS-Control is too buggy for my taste; it’s not really a consumer level device and the video output isn’t good enough (for my taste).

The RT5X is… just garbage. I’ve had it for years and I can’t say anything positive about it. It was and is a huge disappointment. I got the OSSC Pro over the RT4K because of my negative experience with the RT5X. I’ve had an overwhelmingly positive experience with my original OSSC.

I’m going to try using an HDMI audio extractor and sending the audio to the Sony CRT. I don’t know that it will work, and it’s not the ideal solution.

Any help is appreciated.

[marqs]

I’ll need to check the audio metadata as another user reported similar issue, audio only working if Quad Stereo setting was set to 4.0.

[GeorgeSpinner]

Thanks a lot.

I tried the quad stereo settings and it did not have any impact on my issue.

I’m not suggesting you said it would, but I thought the info couldn’t hurt.

[GeorgeSpinner]

Update – no audio from HDMI audio extractor either.

I tested that the extractor works correctly with other audio sources.

[marqs]

I just looked into the metadata. Audio Infoframe is identical to original ossc, but IEC60958 channel status data is slighly different. I can release a test version which has that header set up the same way.

[GeorgeSpinner]

Thanks for checking. I would definitely test that out.

[marqs]

A test firmware can be downloaded here, hopefully that fixes the issue.

[GeorgeSpinner]

Thanks! I’ll try to test it out tonight.

[Hojo_Norem]

I can report that with the test firmware my Yamaha AVR now recognises 96 and 192 KHz audio from the OSSC Pro.  96KHz sounds slightly quieter than 48 and 192 is quieter still, nothing that bumping up the ADC gain doesn’t fix.  My model AVR is quite old, so it forces itself into ‘Straight’ mode when 192KHz is selected.

• This reply was modified 8 months, 3 weeks ago by Hojo_Norem.

[GeorgeSpinner]

Apologies for the delay. I got busy with my son’s spring break the past few days.

Using the test firmware, I am now getting audio from the HDMI to Component converter. I can finally play Open Ice on my Sony in 240p.

Thanks a lot!

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