Flashing Blue Screen when Playing Videos

[WANGJIEKE]

System and IINA version:

• macOS 10.13.4
• IINA 0.0.15.1

Expected behavior:
Play the video normally.

Actual behavior:
When the setting "Preference -> Codec -> Video -> Hardware Decoder" is set to "Auto" and the file is a .mkv file with HEVC encoding, the video flashes between blue screen and the content of the video. If the hardware decoder is disabled, the problem disappears.
当播放HEVC编码的mkv文件，且硬件解码器被设置为“自动”时，画面在蓝屏和实际视频内容之间不断闪烁。如果将硬件解码器设置成“禁用”，问题消失。

Steps to reproduce:

1. Set the Hardware Decoder to "Auto"
2. Play a .mkv file whose encoding is HEVC

• MPV does not have this problem.

How often does this happen?
Always, if the file is a .mkv file with HEVC encoding

[lhc70000]

It should be related to FFmpeg 4.0 / mpv 0.28.

There're similar reports in mpv-player/mpv#5755.

[tmm1]

I have a hacky fix in http://ffmpeg.org/pipermail/ffmpeg-devel/2018-May/229483.html, but would be better to figure out the root cause.

[saagarjha]

Since this is an upstream issue, we're unlikely to merge it in here directly. I think the best course of action is to allow FFmpeg to come to consensus on how to resolve this issue, then wait for the changes to percolate downstream.

[tmm1]

Here is an updated version of the patch if anyone would like to help test it: tmm1/FFmpeg@d5624b0

If it works, I will commit to FFmpeg master.

[tmm1]

The fix has been merged to FFmpeg master: FFmpeg/FFmpeg@8f146b5

[danshao]

Still getting this issue with the 0.0.15.1 Build 69. Does not occur while using mpv.

[inflation]

@danshao I believe build 69 does not build from ffmpeg HEAD, try build 80.

[frost134]

Getting the issue too, totally the same situation.

[lhc70000]

This issue happens in 0.0.15.1 or 1.0.0 beta1 which were built against FFmpeg 4.0. Please either rollback to 0.0.15 or upgrade to 1.0.0 beta3 if this bug annoys you.

[lhc70000]

@xinxiaoliang Please check the comment above.

[fancyme]

I have the same problem.