Screen Mirrored is Inverted

[kushhh01]

• [ yes ] I have read the FAQ.
• [ yes ] I have searched in existing issues.

Environment

• OS: [e.g. Debian (Kali Linux),Windows]
• scrcpy version: [e.g. 1.13]
• installation method: [e.g. apt, Windows release...]
• device model:
• Android version: [e.g. 10]

Describe the bug
A clear and concise description of what the bug is.

On errors, please provide the output of the console (and adb logcat if relevant).

Please paste terminal output in a code block.
INFO: scrcpy 1.12.1 <https://github.com/Genymobile/scrcpy>
/usr/share/scrcpy/scrcpy-server: 1 fil...shed. 0.0 MB/s (24773 bytes in 1.200s)
error: more than one device/emulator
ERROR: "adb reverse" returned with value 1
WARN: 'adb reverse' failed, fallback to 'adb forward'
INFO: Initial texture: 1600x896

Please do not post screenshots of your terminal, just post the content as text instead.
When ever I screen mirror any device it gets mirror but inverted like every thing is inverted.

[rom1v]

Inverted how? Vertically?

If you record with:

adb shell screen record /sdcard/file.mp4
adb pull /sdcard/file.mp4

Is the video "inverted" too?

[kushhh01]

Yes the video too is inverted

…

On Mon, 11 May, 2020, 12:18 pm Romain Vimont, ***@***.***> wrote: Inverted how? Vertically? If you record with: adb shell screen record /sdcard/file.mp4 adb pull /sdcard/file.mp4 Is the video "inverted" too? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1380 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APRBYVZATGC6ZBFJYD6TWD3RQ6NVLANCNFSM4M5SYUBQ> .

[rom1v]

OK, so there is a bug in your device ROM.

Is it flipped vertically, or rotated 180°?

If you rotate it twice with Ctrl+→ (or scrcpy --rotation 2), does it workaround the problem?

[kushhh01]

It is not flipped it is inverted

…

On Mon, 11 May, 2020, 1:39 pm Romain Vimont, ***@***.***> wrote: Is it flipped vertically, or rotated 180°? If you rotate it twice with Ctrl+→ (or scrcpy --rotation 2), does it fix the problem? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1380 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APRBYVZBHUDJLQLTEQMFU7TRQ6XFFANCNFSM4M5SYUBQ> .

[rom1v]

What do you mean by inverted, then? Cold you post a screenshot?

[kushhh01]

Yes wait I'll email you the screenshot

…

On Mon, 11 May, 2020, 1:50 pm Romain Vimont, ***@***.***> wrote: What do you mean by inverted, then? Cold you post a screenshot? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1380 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APRBYV6H6KNDALWUVLEE4Y3RQ6YNLANCNFSM4M5SYUBQ> .

[kushhh01]

Here is screenshot of how actually inverted it is.

…

On Mon, 11 May, 2020, 1:54 pm MH12 l Kushhh, ***@***.***> wrote: Yes wait I'll email you the screenshot On Mon, 11 May, 2020, 1:50 pm Romain Vimont, ***@***.***> wrote: > What do you mean by inverted, then? Cold you post a screenshot? > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <#1380 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/APRBYV6H6KNDALWUVLEE4Y3RQ6YNLANCNFSM4M5SYUBQ> > . >

[rom1v]

You can't send it by email that way, you have to post it on the GitHub thread.

[kushhh01]

[rom1v]

OK so it's flipped (horizontally). This is a bug on your device, and scrcpy does not provide any option to workaround that.

You could force a flip by modifying the source code and building:

diff --git a/app/src/screen.c b/app/src/screen.c
index 0af8de8..14c478e 100644
--- a/app/src/screen.c
+++ b/app/src/screen.c
@@ -444,7 +444,7 @@ screen_update_frame(struct screen *screen, struct video_buffer *vb) {
 void
 screen_render(struct screen *screen) {
     SDL_RenderClear(screen->renderer);
-    if (screen->rotation == 0) {
+    if (false && screen->rotation == 0) {
         SDL_RenderCopy(screen->renderer, screen->texture, NULL, NULL);
     } else {
         // rotation in RenderCopyEx() is clockwise, while screen->rotation is
@@ -464,7 +464,7 @@ screen_render(struct screen *screen) {
         }
 
         SDL_RenderCopyEx(screen->renderer, screen->texture, NULL, dstrect,
-                         angle, NULL, 0);
+                         angle, NULL, SDL_FLIP_HORIZONTAL);
     }
     SDL_RenderPresent(screen->renderer);
 }

[kushhh01]

I have installed it using apt. I haven't built this. So in order to build where exactly can I change source code?

[pokekrishna]

I wanted to view my screen flipped for a video-recording studio. This issue has helped me instead. Going to rebuild on Windows.

Where can I see what are the other options instead of SDL_FLIP_HORIZONTAL?

[pokekrishna]

We can keep a command-line argument for showing the flipped video (both horizontal and vertical), much like other switches.
Food for thought

[mostm]

In case someone still needs this, here is a Windows build of the current commit on master w/ changes suggested by @rom1v
scrcpy-v1.21-2-g5704ec6.zip

[DRSDavidSoft]

@rom1v The addition of a switch such as --flip [v,h] would be appreciated!

[FinlayDaG33k]

In case someone still needs this, here is a Windows build of the current commit on master w/ changes suggested by @rom1v scrcpy-v1.21-2-g5704ec6.zip

Build sadly doesn't work, always returns "could not execute adb push" (whereas the 1.21 release from here works just fine... with the image flipped horizontally).

[jz1]

set bluestacks graphic engine mode to "Compatibility", it will show normal display then

[gac123]

In case someone still needs this, here is a Windows build of the current commit on master w/ changes suggested by @rom1v scrcpy-v1.21-2-g5704ec6.zip

hey mostm, I built it as well with those changes but get error when running scrcpy (rasp pi 400, debian bullseye) ERROR: Could not initialize SDL: displayIndex must be in the range 0 - -1

were there any other changes required? or would something else be required for v1.24?

[rom1v]

Please test #4441.

[rom1v]

Implemented in v2.3.