thread 'main' panicked at 'Could not capture an image: CaptureTimeout'

[zoumi]

Hi,I got an error: CaptureTimeout.
I'm using a notebook. When the app starts, I can see the LED beside the camera is turn on for about 200ms.
My PC ENV:

$ rustup show
Default host: x86_64-pc-windows-msvc
rustup home:  E:\rustup

installed toolchains
--------------------

nightly-i686-pc-windows-msvc (default)
nightly-x86_64-pc-windows-msvc

active toolchain
----------------

nightly-i686-pc-windows-msvc (default)
rustc 1.41.0-nightly (27d6f55f4 2019-12-11)

$ /e/rustdir/target/debug/test_escapi.exe devices: 1 capture initialized, device name: USB HD Webcam Frame #0, captured and saved as image.png thread 'main' panicked at 'Could not capture an image: CaptureTimeout', src\libcore\result.rs:1189:5 stack backtrace: 0: core::fmt::write at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libcore\fmt\mod.rs:1025 1: std::io::Write::write_fmt<std::sys::windows::stdio::Stderr> at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libstd\io\mod.rs:1426 2: std::panicking::default_hook::{{closure}} at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libstd\panicking.rs:193 3: std::panicking::default_hook at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libstd\panicking.rs:210 4: std::panicking::rust_panic_with_hook at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libstd\panicking.rs:471 5: std::panicking::begin_panic_handler at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libstd\panicking.rs:375 6: core::panicking::panic_fmt at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libcore\panicking.rs:84 7: core::result::unwrap_failed at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\/src\libcore\result.rs:1189 8: core::result::Result<slice<u8>*, escapi::Error>::expect<slice<u8>*,escapi::Error> at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\src\libcore\result.rs:984 9: test_escapi::main at H:\work\rust_projects\test_escapi\src\main.rs:23 10: std::rt::lang_start::{{closure}}<()> at /rustc/27d6f55f47e8875e71083a28ed84ea5a88e1b596\src\libstd\rt.rs:67 note: Some details are omitted, run withRUST_BACKTRACE=fullfor a verbose backtrace.