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diff -up firefox-76.0.1/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp.old firefox-76.0.1/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
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--- firefox-76.0.1/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp.old	2020-05-13 14:28:26.556800474 +0200
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+++ firefox-76.0.1/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp	2020-05-13 14:28:31.562768959 +0200
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@@ -43,7 +43,7 @@ typedef int VAStatus;
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 #endif
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 // Use some extra HW frames for potential rendering lags.
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-#define EXTRA_HW_FRAMES 6
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+#define EXTRA_HW_FRAMES 20
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 typedef mozilla::layers::Image Image;
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 typedef mozilla::layers::PlanarYCbCrImage PlanarYCbCrImage;