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Sergiej, please take a look at TRVCamRTSPGetThread - looks like values width and/or height are "shifted" in memory.

Unit MRVFFMPEGObject :
function TRVMFFMPEG.PlayDecode : boolean;
var
frame_finished: Integer;
delay: double;
IsFirstFrame, DropIt: Boolean;
begin
Result := False;

Err := ReadFrame(FormatContext, Packet, DecCurTime);
if (Err < 0) then
Exit;

try

IsDecodeStart := False;
if ...

I forgot to mention, I use Delphi 10.4, Windows 10 64bits, both apps are 32 bits.
Maybe some project properties could make difference?

Thank you for your response.

ad. 1, 2, 3, 4, 5
Checked.

ad. 6
I've found in unit MRVType constant RV_WM_USER . I understand it is used for messages.
I've changed it to RV_WM_USER = $400 + $1D4C; , because value $400 interferes with constant in problematic app.
Unfortunately it did not help ...

I've upgraded from version 8.0 to 8.1, did not help.

Well, all DDLs I've described above are loaded earlier in problematic app, before start playing stream.

In Delphi debug window after launching
(RVCamViewInPanel.VideoSource as TRVCamera).PlayVideoStream
in problematic app:

Thread Start: Thread ID: 8772. Process Security.exe (12984)
Thread Start: Thread ID: 9540. Process Security.exe (12984)
Thread Start: Thread ID: 14972. Process Security.exe ...

I have noticed, that the problematic application after executing: almost doesn't consume processor usage (about 0.3%), while the test app consume
about 10%.

Priviet!

I write such code :

1. on click button
RVCameraInPanel.URL := 'rtsp://user:pass@my_ip:554/cam/realmonitor?channel=1&subtype=0';
RVCameraInPanel.DeviceType := rvdtRTSP;
RVCameraInPanel.VideoFormat := rvvfMP4_MPEG;

RVCamViewInPanel.VideoSource := RVCameraInPanel;
(RVCamViewInPanel ...