适用于iOS的Twilio Video崩溃

Question

I'm building an iOS app using Twilio-Video ( https://www.twilio.com/docs/api/video ). My app running on iPhone SE received error messages and crashed in 10 seconds after local video track enabled.

2016-09-05 11:23:45.676 MyApp[4818:256404] INFO:TwilioConversations:[Core]:Media track changed trackId: bcd5bf96a31e1c928950b3195aa83598c993 enabled: 1
2016-09-05 11:23:45.862 MyApp[4818:255337] INFO:TwilioConversations:[Signaling]:RESIP::DUM: Got: SipResp: 200 tid=6abfba7dd0228d35 cseq=2 PUBLISH / 2 from(wire)
2016-09-05 11:23:46.809 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:47.814 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:48.818 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:49.823 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:50.824 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:51.827 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:52.828 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:53.830 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:54.125 MyApp[4818:256404] INFO:TwilioConversations:[Core]:PeerConnection: connection completed.
2016-09-05 11:23:54.833 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:55.836 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
2016-09-05 11:23:56.838 MyApp[4818:253499] ERROR:TwilioConversations:[Platform]:Failed to get a drawable!
/BuildRoot/Library/Caches/com.apple.xbs/Sources/Metal/Metal-56.7/ToolsLayers/Debug/MTLDebugRenderCommandEncoder.mm:524: failed assertion `For depth attachment, the renderPipelineState pixelFormat must be MTLPixelFormatInvalid, as no texture is set.'

Stack trace.

* thread #1: tid = 0x3de3b, 0x0000000181f1811c libsystem_kernel.dylib`__pthread_kill + 8, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x0000000181f1811c libsystem_kernel.dylib`__pthread_kill + 8
    frame #1: 0x0000000181fe4ef8 libsystem_pthread.dylib`pthread_kill + 112
    frame #2: 0x0000000181e89dc8 libsystem_c.dylib`abort + 140
    frame #3: 0x0000000181e5ee54 libsystem_c.dylib`__assert_rtn + 284
    frame #4: 0x00000001844b533c Metal`MTLReportFailure + 480
    frame #5: 0x00000001973056dc MetalTools`-[MTLDebugRenderCommandEncoder validateFramebufferWithRenderPipelineState:] + 1292
    frame #6: 0x0000000197305ba0 MetalTools`-[MTLDebugRenderCommandEncoder setRenderPipelineState:] + 356
  * frame #7: 0x00000001002e42b0 MyApp`-[TWCMetalRenderer encode:](self=0x0000000159293680, _cmd=<unavailable>, renderEncoder=<unavailable>) + 124 at TWCMetalRenderer.mm:392 [opt]
    frame #8: 0x00000001002e4514 MyApp`-[TWCMetalRenderer render:frame:](self=0x0000000159293680, _cmd=<unavailable>, view=<unavailable>, frame=<unavailable>) + 220 at TWCMetalRenderer.mm:438 [opt]
    frame #9: 0x00000001003012d4 MyApp`-[TWCMetalView display](self=0x000000015955eb10, _cmd=<unavailable>) + 328 at TWCMetalView.mm:256 [opt]
    frame #10: 0x00000001002d4c2c MyApp`-[TWCMetalVideoRenderer renderingloop](self=<unavailable>, _cmd=<unavailable>) + 204 at TWCMetalVideoRenderer.m:210 [opt]
    frame #11: 0x00000001002d4a48 MyApp`__46-[TWCMetalVideoRenderer dispatchRenderingLoop]_block_invoke(.block_descriptor=<unavailable>) + 36 at TWCMetalVideoRenderer.m:139 [opt]
    frame #12: 0x00000001002e4ef8 MyApp`-[TWCDisplayLinkTimer displayLinkDidFire:](self=<unavailable>, _cmd=<unavailable>, displayLink=<unavailable>) + 28 at TWCDisplayLinkTimer.mm:65 [opt]
    frame #13: 0x0000000100c74aa0 libMTLInterpose.dylib`-[DYDisplayLinkInterposer forwardDisplayLinkCallback:] + 184
    frame #14: 0x0000000184eb822c QuartzCore`CA::Display::DisplayLinkItem::dispatch() + 40
    frame #15: 0x0000000184eb80e0 QuartzCore`CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 424
    frame #16: 0x00000001825f5e54 IOKit`IODispatchCalloutFromCFMessage + 372
    frame #17: 0x000000018231d030 CoreFoundation`__CFMachPortPerform + 180
    frame #18: 0x00000001823357d4 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 56
    frame #19: 0x0000000182334f0c CoreFoundation`__CFRunLoopDoSource1 + 436
    frame #20: 0x0000000182332c64 CoreFoundation`__CFRunLoopRun + 1800
    frame #21: 0x000000018225cc50 CoreFoundation`CFRunLoopRunSpecific + 384
    frame #22: 0x0000000183b44088 GraphicsServices`GSEventRunModal + 180
    frame #23: 0x000000018754a088 UIKit`UIApplicationMain + 204
    frame #24: 0x00000001000d5e40 MyApp`main + 144 at AppDelegate.swift:27
    frame #25: 0x0000000181dfa8b8 libdyld.dylib`start + 4

What does "Failed to get a drawable" mean ?

Details:

• TwilioConversationsClient 0.25.1(Twilio Common 0.3.1)
• My app sends invite repeatedly until participant rejects it, and creates TWCLocalMedia instance each time. (wrong?)
• App doesn't crash when iPhone SE accepts incoming invite.

Answer 1

• Open the Edit Scheme ,

• Uncheck Debug executable in Info segment

• Run again!