fix seamless loop

[Andrey933]

There is a following problem. When we set loops: 2 (for example), then after each ending of video we see a black screen (It's showed about 0.5 second). We have to get rid of it and to create a seamless loop.
As far as I understand the similar problem was described in 638 (Seamless loop on Linux) Issue and 321 Issue (Seamless loop).

[Andrey933]

I have some problems with appveyor for:
-Environment: arch=32, cc=MinGW, qt=5.7, toolchain_version=530, mode=debug, QTDIR=C:\Qt\5.7\mingw53_32
-Environment: arch=32, cc=MinGW, qt=5.4, toolchain_version=491, mode=release, QTDIR=C:\Qt\5.4\mingw491_32

• Environment: arch=32, cc=MinGW, qt=5.3, toolchain_version=482, mode=debug, QTDIR=C:\Qt\5.3\mingw482_32
  Can you give me a hint why it happens?

[wangwenx190]

I think you can ignore AppVeyor and TravisCI, they will always fail.

[kelteseth]

Any update on this?