XCode 9: Main Thread Checker: UI API called on a background thread: -[UIView layer]

[lrs0304]

XCode9 新增了Main thread checker，可以在secheme里面关闭，提示called on a background thread

环境：XCode 9
代码：k.0.8.3
资源：任意视频链接
日志：

ijkmp_get_meta_l
ijkmp_get_meta_l()=void
ijkmp_set_playback_rate(1.000000)
Playback rate: 1.000000
ijkmp_set_playback_rate()=void
ijkmp_set_playback_volume(1.000000)
ijkmp_set_playback_volume()=void
mediaIsPreparedToPlayDidChange
loadStateDidChange: MPMovieLoadStatePlayable--->Playing: 3
moviePlayBackStateDidChange 1: playing
Reinit context to 1920x1088, pix_fmt: yuv420p
no picture 
no picture 
no picture 
aout_set_volume()
SDL_VoutFFmpeg_CreateOverlay(w=1920, h=1080, fmt=I420(0x30323449, dp=0x600000466540)
Video: first frame decoded
[GLES2] Version = OpenGL ES 2.0 APPLE-15.0.48
[GLES2] Vendor = Apple Inc.
[GLES2] Renderer = Apple Software Renderer
[GLES2] Extensions = GL_OES_depth_texture GL_OES_depth_texture_cube_map GL_OES_depth24 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_float GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_vertex_array_object GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_draw_instanced GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_pvrtc_sRGB GL_EXT_read_format_bgra GL_EXT_separate_shader_objects GL_EXT_shader_framebuffer_fetch GL_EXT_shader_texture_lod GL_EXT_shadow_samplers GL_EXT_sRGB GL_EXT_texture_filter_anisotropic GL_EXT_texture_rg GL_EXT_texture_storage GL_APPLE_clip_distance GL_APPLE_color_buffer_packed_float GL_APPLE_copy_texture_levels GL_APPLE_framebuffer_multisample GL_APPLE_rgb_422 GL_APPLE_sync GL_APPLE_texture_format_BGRA8888 GL_APPLE_texture_max_level GL_APPLE_texture_packed_float GL_IMG_read_format GL_IMG_texture_compression_pvrtc 
create render yuv420p
use render yuv420p
=================================================================
Main Thread Checker: UI API called on a background thread: -[UIView layer]
PID: 37473, TID: 206703, Thread name: ff_video_dec, Queue name: com.apple.root.default-qos.overcommit, QoS: 21
Backtrace:
4   KwailyLivePlayer                    0x000000010cf398db -[IJKSDLGLView eaglLayer] + 43
5   KwailyLivePlayer                    0x000000010cf3a8b7 -[IJKSDLGLView displayInternal:] + 151
6   KwailyLivePlayer                    0x000000010cf3a7c4 -[IJKSDLGLView display:] + 340
7   KwailyLivePlayer                    0x000000010cf5824a vout_display_overlay_l + 186
8   KwailyLivePlayer                    0x000000010cf57fc5 vout_display_overlay + 53
9   KwailyLivePlayer                    0x000000010cf0b72b SDL_VoutDisplayYUVOverlay + 59
10  KwailyLivePlayer                    0x000000010cf31069 video_image_display2 + 857
11  KwailyLivePlayer                    0x000000010cf305ff video_display2 + 47
12  KwailyLivePlayer                    0x000000010cf29f2b queue_picture + 1675
13  KwailyLivePlayer                    0x000000010cf2aa82 ffplay_video_thread + 930
14  KwailyLivePlayer                    0x000000010cf2a6d5 ffp_video_thread + 21
15  KwailyLivePlayer                    0x000000010cf0bc34 func_run_sync + 36
16  KwailyLivePlayer                    0x000000010cf1a725 ffpipenode_run_sync + 37
17  KwailyLivePlayer                    0x000000010cf342c9 video_thread + 57
18  KwailyLivePlayer                    0x000000010cf35eba SDL_RunThread + 74
19  libsystem_pthread.dylib             0x000000011660e93b _pthread_body + 180
20  libsystem_pthread.dylib             0x000000011660e887 _pthread_body + 0
21  libsystem_pthread.dylib             0x000000011660e08d thread_start + 13

关闭检查的方法：

[IvanGrab]

The same issue:
iOS 11 GM
XCode9 Beta

[reports] Main Thread Checker: UI API called on a background thread: -[UIView layer]
PID: 9067, TID: 3950540, Thread name: ff_vout, Queue name: com.apple.root.default-qos.overcommit, QoS: 21

[YaHoYii]

我也发现这个问题。。。但是这么解决？
关掉它？！

[bhltyou]

@lrs0304 @IvanGrab @YaHoYii 请问大家怎么解决的

[IvanGrab]

@bhltyou try run project with library on iOS 11 and XCode9, turn on "All Exception" breakpoint play some live video stream and i think Xcode will catch the row here is an issue.
and bring that method in main thread!

[bhltyou]

@IvanGrab thanks a lot

[QiuDaniel]

@bhltyou 成功了吗？具体怎么修改的？

[yjjwxy2]

问题解决了吗，只能设置关闭吗，求方法 @lrs0304

[poholo]

#4681 应该是App启动后第一次会有这个线程问题，之后一切正常，感觉是xcode升级成10之后出现的。

[poholo]

#4683

[poholo]

pod 'MCIJKPlayer'

[PengYang1991]

我也遇见了这个问题暂时先关闭了xcode Main Thread Checker 这个选项，想知道有没有更好的解决方式

[poholo]

我也遇见了这个问题暂时先关闭了xcode Main Thread Checker 这个选项，想知道有没有更好的解决方式

#4683
pod 'MCIJKPlayer'

[FxDepths]

我也遇见了这个问题暂时先关闭了xcode Main Thread Checker 这个选项，想知道有没有更好的解决方式

#4683
pod 'MCIJKPlayer'

谢谢 使用MCIJKPlayer替换了ijkplayer,问题解决，暂时没有发现其他问题

[tounaobun]

prod上表现正常，不卡顿；

[lucking]

pod 'MCIJKPlayer'

都Xcode14编译报错

[poholo]

pod 'MCIJKPlayer'

都Xcode14编译报错

请把编译错误贴出来看看