Screenshot of vlc in overlay mode (while playing a video) shows a black rectangle

[kaoutsis]

a) open vlc to play an internet tv station stream. b) while vlc is playing the video, press "print screen" key to take a screenshot, c) open the screenshot-image with ShowImage, vlc window has a black rectangle.

more: start vlc again, open a video, or let vlc plays the previous video; move litle by litle the ShowImage window (with contains the screenshot with the black vlc window, in front of vlc, surprise! in the black vlc window of the ShowImage, you see the video that vlc plays in the background.

note: vlc doesn't have this behavior on r5, so i guess it is not vlc bug.

[kaoutsis]

a screenshot of vlc with the black rectangle

[korli]

This is a feature of overlay : http://en.wikipedia.org/wiki/Video_overlay I wouldn't consider this as a bug though.

[kaoutsis]

Replying to korli:

This is a feature of overlay : http://en.wikipedia.org/wiki/Video_overlay I wouldn't consider this as a bug though.

Thanks for the link.

first i must make a correction (examine more closely the ticket): r5 has exactly the same behavior. the window in the screenshot is not black but gray (so the note on the description is not correct), i still don't know how this came out to my mind:)

So i guess no screenshot is possible?

[axeld]

It's possible - the app_server could copy the overlay into the screenshot - like it already does for the hardware cursor. I'll change this to an extension :-)

[jackburton]

Replying to axeld:

It's possible - the app_server could copy the overlay into the screenshot - like it already does for the hardware cursor.

Does it ? But we don't even have an hardware cursor yet :)

[kaoutsis]

Just for the record: http://web.syllable.org/images/screenshots/Desktop/0.6.5/VLC-on-Syllable-0.6.5.png

[diver]

http://www.pinc-software.de/images/haiku_vlc.jpg

[kaoutsis]

more screenshots: http://www.videolan.org/vlc/screenshots.html

[kaoutsis]

Replying to diver:

http://www.pinc-software.de/images/haiku_vlc.jpg

Then the problem occurs only with the overlay technique?

[anevilyak]

That's normal, since the screenshot is taken from the frame buffer, while the actual bitmap data that's shown in overlay mode never actually hits that (the bitmaps being drawn/scaled into that are reside directly in the graphics card's VRAM). It'd take quite some hacks to get that to take a screenshot properly in such a case.

[anevilyak]

Oops, disregard, I missed the earlier comments.