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Old 06-03-2016, 05:43 AM   #1
nofish
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Default Video blend / crossfade jumpy (when using different video formats) (SOLVED)

First pair of crossfaded videos are items from the same video, this is smooth.

The second ones are items from different videos. You can see there's a short 'jump' / 'blackout' when the item of the second video starts.
Apparently this happens when using different video formats when crossfading (maybe not for all combinations, not sure).

https://dl.dropboxusercontent.com/u/...videoXfade.gif
(~5 MB gif, sorry for the jumpy licecap, but the actual crossfade jump / blackout can still be observed)

Video formats used for the second crossfade:

Quote:
Length: 0:24.800
Video: 320x240@15.00fps, Aspect=1.00, Decoding format=I420/YV12
Audio: 7875Hz 1ch 8bps

Using VLC decoder (v2.2.x)
Video: 320x240, MJPG, 15.00fps -- convert from J422
Audio: 7875hz, 8bps, 1ch, u8

Loaded from: C:\Program Files (x86)\VideoLAN\VLC
and

Quote:
Length: 1:07:14.520
Video: 720x576@25.00fps, Aspect=1.00, Decoding format=I420/YV12
Audio: 48000Hz 2ch 16bps

Using VLC decoder (v2.2.x)
Video: 720x576, mp4v, 25.00fps
Audio: 48000hz, 16bps, 2ch, mp3

Loaded from: C:\Program Files (x86)\VideoLAN\VLC
Win 8.1, R5.201, VLC 2.2.3

edit:
Same when decoding with ffmpeg

===

Sneaked in loosely related FR:
Auto crossfade for stills (jpg, png) for slideshows.

Last edited by nofish; 06-03-2016 at 06:29 AM.
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Old 06-03-2016, 06:15 AM   #2
Justin
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Yeah, this is a display issue on Windows when it switches video formats. The best way to deal with this is to set the project video dimensions and enable one of the options to always resize video to project dimensions (you can choose whether you want it resized before FX or after).
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Old 06-03-2016, 06:17 AM   #3
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Ok, thanks.

edit:
Yes, this fixes.
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Old 06-03-2016, 06:30 AM   #4
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Just a note: the reason for this is that in absence of user preference otherwise, we want to always display video in its native format/resolution. Since the resolution changes, we change the video output, which on Windows at least causes a bit of flicker (boo).
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