How to reproduce it:
1. Open the attached project
2. Build and Run it on Android
3. Download a "MZ 103" video and click a "Prepare" button
4. Press the "Slow Mode" Button
5. Press a "Play" Button
6. Observe a timestamp and video in Android phone

Expected result: The first frame is drawn at "00:00.000 (1)"
Actual result: The first frame is drawn at "00:00.067 (2)"

Reproducible with: 2019.4.28f1, 2020.3.12f1, 2021.1.12f1, 2021.2.0b1
Could not test with: 2018.4.36f1

Reproducible on:
VLNQA00331, Huawei P20 lite (ANE-LX1), Android 9, CPU: HiSilicon Kirin 659, GPU: Mali-T830
VLNQA00042, Lge LG G3 (LG-D855), Android 5, CPU: Snapdragon 801 MSM8974AC, GPU: Adreno (TM) 330
VLNQA00285, Samsung Galaxy J4 Core (SM-J410F), Android 8.1.0, CPU: Snapdragon 425 MSM8917, GPU: Adreno (TM) 308
iPad 9.7" 6th gen (14.4)
iPad Air 2 (11.0.3)
iPhone XR (13.4.1)
iPhone 8 Plus (14.4.2)

Not reproducible on:
VLNQA00321, Xiaomi MI 9 (MI 9), Android 10, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640

Could not test on:
VLNQA00038, Htc Desire 510 (HTC Desire 510), Android 4.4.3, CPU: Snapdragon 410 MSM8916, GPU: Adreno (TM) 306
VLNQA00013 - Galaxy S6 Edge+ (SM-G928F), OS: 7.0.0, CPU: Exynos 7 Octa (7420), GPU: Mali-T760

Notes:
- Not reproducible on macOS
- On iOS devices first frame is drawn at about 00:00.035