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Thread: Mega SG no sound except through headphones

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    Mega SG no sound except through headphones

    I can't get sound through my Acer Predator monitor when using my Mega SG. The headphone port works fine.

    I recently upgraded to the most recent smokemonster jailbreak firmware. I've poured through the GUI settings to no avail. My monitor appears to have no settings that effect the sound. The volume on the monitor is up. .

    Roms on SD, official carts, and the GUI splash screen all produce no sound.

    Any ideas???

  2. #2
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    ChuChu Flamingo's Avatar
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    Have you tried outputting to a different tv or speakers over hdmi?

    Might be slightly related but my built in speakers for my ASUS drops audio/ has no audio a lot of times with a OSSC+NESRGB/SNES at 3x/4x. Good thing I use separate speakers and game on a crt primarily or else that would kinda suck. The built in speakers suck ass anyhow.

    Not sure why it happens exactly but I can guess why. From a quick google search the nonstandard refresh rate must throw off whatever audio synchronization these monitors have over hdmi. Keep in mind genesis is 59.92274 Hz not 59.94. Seems to be an extremely common problem with SNES/NES since their refresh rate is so wacky.

    Maybe changing it to 59.94 might fix your audio problems?Here is what I got from the manual on how to do that.


    The buffering modes on Mega Sg address the issue
    that the Genesis/Mega Drive’s native NTSC frame
    rate is 59.92275fps and the PAL rate is 49.70146fps.
    A CRT can display these frame rates with ease but
    modern displays and HDMI interfaces expect either
    60fps, 59.94fps or 50fps and are generally not
    tolerant of refresh rates that vary from too far from
    the official frame rates. Mega Sg has three modes
    that deal with the frame rate differential in different
    ways.
    Fully Buffered Mode buffers full frames to maintain
    the timing of a 59.92 frame rate using only 60fps.
    This mode avoids tearing at the cost of latency.
    Mega Sg must render at least 1 frame ahead
    of the game’s internal rendering to stay ahead.
    The Zero Delay speeds the simulated Genesis/
    Mega Drive up to achieve a true 60fps frame rate,
    a speed difference of 0.13% There is no latency
    penalty with this method but this method causes
    analogue.co V1.2 February 2020 13 / 30
    Mega Sg to jump ahead by about 1 second every
    10 minutes compared to an original Genesis/Mega
    Drive running the same software.
    Finally, the Single Buffer option is something of a
    compromise between the two methods described
    above. Like the Full Buffer option, the correct
    timing is being generated within Mega Sg. Unlike
    the Full Buffer, only a portion of the next frame is
    being pre-rendered, giving latency of no more than
    1 frame depending on when the player activates an
    input. The drawback is a recurring retrace line that
    is visible once per every several seconds.
    Last edited by ChuChu Flamingo; 05-20-2020 at 11:17 AM.
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  3. #3
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    Quote Originally Posted by ChuChu Flamingo View Post
    Have you tried outputting to a different tv or speakers over hdmi?

    Might be slightly related but my built in speakers for my ASUS drops audio/ has no audio a lot of times with a OSSC+NESRGB/SNES at 3x/4x. Good thing I use separate speakers and game on a crt primarily or else that would kinda suck. The built in speakers suck ass anyhow.

    Not sure why it happens exactly but I can guess why. From a quick google search the nonstandard refresh rate must throw off whatever audio synchronization these monitors have over hdmi. Keep in mind genesis is 59.92274 Hz not 59.94. Seems to be an extremely common problem with SNES/NES since their refresh rate is so wacky.

    Maybe changing it to 59.94 might fix your audio problems?Here is what I got from the manual on how to do that.
    I appreciate the in depth info. I havent tried another monitor yet, but did try a different HDMI cable. Mainly because all the power ports by my television are full and its a pain in the ass to hook anything up. I know I'm going to have to do it though. I'll try what you mentioned when I get home about changing the audio.

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