1849695 - When I capture youtube screenshot and post it to Facebook the image is shown a strange scrolled manner.

Status: RESOLVED DUPLICATE of bug 1646063

(Firefox :: Screenshots, defect)

Description

[ISHIKAWA, Chiaki]

Attachment: Youtube screen when captured using "screenshot" and then posted to FB.

I am using Firefox 116.0.3 under Windows 10.
The problem has psrsitent for sometime even in previous versions.

It is hard to explain how the image is shown incorrectly when I post the captured image to Facebook (FB for short).
When I say capture, I use the screenshot menu shown when I hit the right mouse button.

The youtube page I am looking at is https://www.youtube.com/watch?v=RZvjO2NWjAY

I tried to capture the spread of wild fires.

---

(1) I am looking at the screen of a youtube news snipeet from CBC about wild fire.
(2) I thought I capture the image using screenshot, and post it to FB.

Now, I compare the images of (1) and (2) which are captured using a separate screencapture program, MS Snipping Tool (which is being retired, but it still works fine for my purpose).

In the attached image, the left one is the original youtube screen in Firefox, and the right one is the image after it was posted to Facebook.

Note that the image created in FB at step (2) has the strange band near the top. Then I realize this strange horizontal band is actually the upper portion of the original image I tried to capture. (youtube log and search/検索 window). Somehow, the image of the upper part is shifted to the image below in midway and cut the screen in two parts.

I copy &paste the image into FB without saving the image into a file.

I suspect that there is a data value in FB's internal screenshot image to confuse the
FB's copy&paste feature.

Comment 1

[ISHIKAWA, Chiaki]

I tried to see if it was FB's upload feature that got confused.
NO.

When I load the screenshot image from Firefox into MS Paint, the same strange image showed up.
So the screenshot data has this problem internally and that causes the strange image to appear in MS Paint as well.

This did not change when I tried to [download] the screenshot image into a .PNG file and load the .PNG file into paint.
The same strange image appears.

So the screenshot image itself has this strange data internally.

Comment 2

[ISHIKAWA, Chiaki]

OK, I restarted Firefox in troubleshooting mode, and now the image is OK. The clipped image showed up in MS Paint.
So something I added has caused the screenshot problem.
Hmm...

Comment 3

[ISHIKAWA, Chiaki]

Agha.
I reverted the troubleshooting mode. It is now off.
FF was restarted.

This time, the screenshot is not mangled as before somehow (except for the lower part that ought to be in the image, which is not there.)
So there seems to be history-dependent issue. Either a variable is not initialized properly, and some strange value gets stuck sometimes.

I have extensions (I wonder if there is a way to get a textual list of extensions I have in FF.)

• Adblock Plus - free ad blocker.
• ClearURLs
• EPUBReader
• Feedbro
• Keepa - Amazon Price Tracker
• LiveHosts
• Norton Safe Web
• NoScript
• Tabhunter
• Tree Style Tab
• User-Agent Switcher and Manager
• Video DownloadHelper

And plugins.

• OpenH264 Video Codec (Cisco System, Inc.)
• Widevine Content Decryption Module (Google Inc.)

Comment 4

[ISHIKAWA, Chiaki]

I found that the image being trimmed in the lower part (the part I want included is not there) persists in the troubleshooting mode.
So that problem is legitimate.

Hope this helps.

Comment 5

[ISHIKAWA, Chiaki]

Attachment: Screenshot taken in troubleshooting mode. It captures less than what I wanted vertically.

This is again, Windows 10 64-bit.
When I use screenshot of FF in troubleshooting mode, the captured image is shorter vertically than what I want.

In the attached image, the left image was when I captured the part of screen (I resize the capture area by mouse motion and hit copy).
The right image is the screenshot image pasted into MS PAINT.

In the troubleshooting mode, strange horizontal band of misplaced image does not show up. However, the lower portion of the original screen area what I wanted to capture is not in the captured image.

Also, there seems to be a minor scalilng issue. I don't think the spacing between the main video image and the youtube logo on the upperleft is in exact proportion of the original, but this may be an artifact after I tried to place the images side by side in a similar size since their original size was not the same.
I changed the size by expanding or shrinking the images (although I tried to keep the vertical and horizontal ratio intact.)

Again, hope this helps.

I think we need to fix this strange lower-part clipping issue first.

Comment 6

[6k64x4ma]

This seems to be a duplicate of Bug 1646063.

Comment 7

[ISHIKAWA, Chiaki]

(In reply to 6k64x4ma from comment #6)

This seems to be a duplicate of Bug 1646063.

It certainly sounds like the case.

I stand corrected.

The plugins have nothing to do with the slight change in the behavior.
The change was due to my scrolling (or not).

(1) If I have to scroll the screen to reach the lower portion which is not visible initially,
the fixed position element (youtube logo gets in the way.) is copied in the unwanted position.
If I do not scroll, the strange copy does not occur at all with my plugins.

But then I noticed one thing.

(2) The captured image is still short in the sense that the lower portion of the screen which I wanted to capture after scrolling is missing.
The original CBC video page is not very long vertically.
So I tried to see if this is true with other page. Yes, the image is too short vertically, the lowest portion is missing.
But I could not discern the pattern of how the image is cut short. The amount of the missing height is not easily guessable.