Decoded hifi audio is noisy at best, or distorted in other cases

[davidvankemenade]

Checklist

• ✅ I have searched the issues page for any duplicate issues open or closed and confirmed that this bug has not been reported before.
• ✅ I have tested the issue with the current build.
• ✅ I have attached log files, uploaded sample data, and commands used so that the issue can be easily reproduced by the developers.

Bug Description

Decoded hifi audio is noisy at best, or distorted in other cases.

Steps to Reproduce

1. Download sample capture: Hi8-sitcom-DvK.s16
2. Decode audio using decode.exe hifi --pal --frequency 40 --audio_rate 48000 Hi8-sitcom-DvK.s16 Hi8-decoded.flac
3. Repeat decode with --8mm added

Expected Behaviour

• First section of flac file should be mute, as tape hasn't started yet
• Second section of flac file should be good quality sound without significant noise
• Adding --8mm parameter in case of Video8 or Hi8 should improve the decoded sound

Actual Behaviour

• First section of flac file is pure noise
• Second section of flac file is noisy and somewhat distorted
• When --8mm parameter is added, sound is extremely distorted

Environment

• vhs-decode release 0.2.7
• Operating System: Windows 10

Additional Information

• It doesn't seem to make much difference whether tape starts after capture has started or not.
• Some sections of large DdD captures sound better than others, it's not yet clear why.

Is it related to tbc-video-export?

No