Fix video flickering #1268
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Fix video flickering #1268
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Playing some videos which seem to contain invalid frames results in annoying flickering becouse a_v gets vanished each time a frame cannot be decoded.
For example, the archive examples.zip
contains two webm videos. The origin.webm is correcly played by ffplay or any other players but flickers in QtAV players (Player.exe, QMLPlayer.exe or a simple cutom project using Video.qml). The coded.webm has been coded via ffmpeg and it works fine in all players.