检查xcode 8.2更改时，我发现现在我们可以使用终端记录模拟器。
因此，我正在尝试按照此Apple文档中描述的iOS模拟器录制视频。
使用命令行录制屏幕截图或录制视频
命令：
xcrun simctl io启动recordVideo demovideo.mp4
错误：
2016-12-20 15:44:27.206 simctl[6434:984477] *** Assertion failure in +[SimDisplayVideoWriter videoWriter], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreSimulator/CoreSimulator-338.16/SimulatorKit/SimDisplayVideoWriter.m:48
2016-12-20 15:44:27.207 simctl[6434:984477] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Failed to create metal device for video writer.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fffa07f90db __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fffb548ba2a objc_exception_throw + 48
2 CoreFoundation 0x00007fffa07fdc32 +[NSException raise:format:arguments:] + 98
3 Foundation 0x00007fffa2266d50 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4 SimulatorKit 0x000000010a248c53 +[SimDisplayVideoWriter videoWriter] + 1015
5 SimulatorKit 0x000000010a2499e5 +[SimDisplayVideoWriter videoWriterForURL:fileType:] + 316
6 simctl 0x000000010a168a00 simctl + 31232
7 simctl 0x000000010a166bee simctl + 23534
8 simctl 0x000000010a170d52 simctl + 64850
9 libdispatch.dylib 0x00007fffb5d3fef7 _dispatch_call_block_and_release + 12
10 libdispatch.dylib 0x00007fffb5d370b8 _dispatch_client_callout + 8
11 libdispatch.dylib 0x00007fffb5d39029 _dispatch_root_queue_drain + 917
12 libdispatch.dylib 0x00007fffb5d38c47 _dispatch_worker_thread3 + 99
13 libsystem_pthread.dylib 0x00007fffb5f84712 _pthread_wqthread + 1299
14 libsystem_pthread.dylib 0x00007fffb5f841ed start_wqthread + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6
iOS模拟器和应用程序都可以正常工作。此错误仅在终端中显示。
我正在使用Xcode 8.2。在iPhone 7、7 plus，iOS 10.2的模拟器中尝试。
我是否缺少任何细节或需要安装和组件？
视频录制仅在支持金属的Mac上支持。如果您的系统不支持金属，您将看到该消息中止。是的，我们应该使该错误消息更加用户友好。
要查看受支持的系统列表，您可以查看https://support.apple.com/en-us/ht205073
这也已修复在Xcode 8.3 beta中：http：//adcownload.apple.com/developer_tools/xcode_8.3_beta/release_notes_for_for_for_for_for_for_for_xcode_8.3_beta.beta.pdf
•XCRUN命令行工具的SIMCTL工具录制的视频现在正确地支持擦洗和导入到视频编辑器中。（29654098）
我目前没有测试此错误，但在稳定版本的Xcode中，此错误将被修复