Forums - VideoLab

Problems copying video file using TVLLACVideoLogger and TVLLACVideoPlayer

Tue, 18 Jun 2019 13:33:26 -0400

I tried to make a simple copy program for video files, just connecting a TVLLVAVideoplayer to a TVLLVAVideoLogger. Videoopins and Audiopins are connected properly. Filenames are given and both components are disabled initially. A TVLImageDisplay component is added to allow observing what happens.

Logger compression is AutoSelect.

A click on a button executes the following code:

VLLAVVideoPlayer1.open;
VLLAVVideoPlayer1.start;
VLLAVVideoLogger1.enabled := true;

What follows is a short flicker of the video and then an error message ("could not open video codec.....").
Pressing CONTINUE an message integer divide by zero at... appears.

Just showing the video not connecting the logger is OK.

The problem appears in VCL and FMX.

Where is my mistake?

Thanks for any help

Wilfried

Watermark?

Sun, 07 Jan 2018 23:35:43 -0500

Hi.
I've been using Videolab and Audiolab in a non commercial app I developed for a charity organization for quite a few years. Recently I recompiled the app in Delphi Tokyo (from Delphi 2010) with the newest release of Videolab and am now seeing what appears to be a watermark on the videos. The text shown is 'DisposeOfVersion-www.Mitov.com'.
How can I remove/disable the text?
Thanks.

CurrentTime error when changed playbackrate

Sun, 25 Jun 2017 19:23:53 -0400

Hi All,
I have an application where I watch video and note the time when certain events occur. I want to do this with sped up video as the events are rare and easily seen.

problem is, if I increase the playbackrate to say 3.0, the CurrentTime value does not stay in sync with the elapsed time. Neither does the CurrentFrame value when accessed during the Progress event.

Any ideas on how I can get an (reasonably) accurate elapsed time counter during greater than x1 playback?

Mark

TVLLAVVideoPlayer playlist ?

Sat, 11 Mar 2017 03:22:09 -0500

I try to play next clip of a playlist with the TVLLAVVideoPlayer, but my code on the stop events dossn't launch the next clip ...

Does somebody knows the correct sequence of instruction to do this ?

loop is set to false

on stop event code :

if select1 > length(arrayfichier1)
then
select1 := 1
else
select1 := select1 +1;

fichier1 := arrayfichier1[select1-1];
titre1.Caption := extractfilename(fichier1);

P1.FileName := fichier1;
p1.Open;

Application.HandleMessage;
p1.Paused := False;
p1.Start();

two webcam error

Sun, 27 Nov 2016 11:32:28 -0500

Dear All~~
I want to add two VLDSCapture object to show two webcam video.
If I use two webcam at the same time.
It always have the same error message (ESLException with message 'Can't start capture. -2147942431 - 8007001F').
How can I use two webcam at the same time?

note: I use XE6 and install VisionLab_VCL_7.6.1.0

Thanks.

Much lag video capture

Mon, 14 Sep 2015 19:29:35 -0400

Hello:

I'm showing video from FireWire in 2 videoplayer at same time. If I put an PNG image over video, start a lag that reaches the 7 seconds before the application hangs. Impossible record the mixed video (FireWire and PNG).

Any suggestions?.

Thanks.

Save Individual Frames

Thu, 23 Jul 2015 18:13:44 -0400

I am trying to find a way to save some frames of video, so that I can display them later. So far I used TVLDSVideoPlayer to play the video and TVLSnapshot to take a shot from video but there is no way I can save a frame. I can show the frame I got snapshot but cannot save and display later.
Any help, hint will be appreciated.
Thanks.

Generating Video File from Bitmaps

Sun, 29 Dec 2013 22:04:39 -0500

Hi there,
I'm trying to develop an application in which I use a sequence of bitmap files and convert them to a video (.avi, for instance) file.

Can I use VideoLab to do so, or I need to write a custom code for that?

IP Cameras

Sat, 23 Nov 2013 07:44:36 -0500

Hi, i am playing around with some ip camers and trying to develop an application myself to fetch and record the ip camera feed incase of motion detection. VisionLab provides everything i need. But i cant seem to find any samples, i played around alot with connection pins from VLIPCamera,VLImageDisplay, VLDSImageDisplay etc... but i cant seem to make it work, it would be nice to have some samples for them.

Can anyone let me know does it even work with ip cameras or not, everywhere i see under mitov library it says that it support ip cameras.

I am trying to work with both RTSP and MJPEG cameras.

Thanks

ShowVideoDialog(cdVideoFormat) does not work

Mon, 21 Oct 2013 03:41:25 -0400

Hi,

the VLDSCapture1.ShowVideoDialog(cdVideoFormat) does not work, could you please provide me an example how to run it ?

br
Piotr Polok

Difference between VLDSCapture1 and VLCapture1

Mon, 21 Oct 2013 03:26:25 -0400

Hi,

could you please provide me an information what is a main difference between components VLDSCapture1 and VLCapture1 (difference in the application of).

br
Piotr Polok

How to capture bitmap - VLDSCapture1

Mon, 21 Oct 2013 03:13:27 -0400

Hi,

Could you please provide me an example how to capture bitmap or jpeg from VLDSCapture1 ?

br
Piotr Polok

AXIS component registration

Wed, 25 Sep 2013 08:55:57 -0400

Something I noticed. Running register.bat 'as administrator' under Win7 does not properly register the components. However if I open a cmd.exe as administrator and run register.bat from there it works fine.

Thought I'd pass this along. Problem results in an exception:

Exception ESLException in the module ....exe at . Can't connect. Make sure Axis medi control from http//www.axis.com is installed. - 0 - 0.

error message

Sun, 23 Jun 2013 13:17:45 -0400

using the latest .net build in VS2012 and get an error every time i run project this includes any of the demos, after i aknowledge the error the project runs ok, this happens with videolab, audiolab etc
The error i get all points to same file

error1.gif (Size: 112.62 KB / Downloads: 6)

Webcamera button event

Wed, 20 Feb 2013 08:19:28 -0500

Almost any webcams have button on it. Is it possible to capture webcam button? I need capture video from webcam and capture webcam button and do some stuff in this button capture event (i don't need steel image capture by pressing this button). Is it possible and how?

USB Frame grabber

Tue, 19 Feb 2013 03:44:47 -0500

Can VideoLab work with USB frame grabbers like this http://mysku.ru/blog/tinydeal/9863.html ?

License Key

Wed, 09 Jan 2013 17:24:20 -0500

I ordered Video basic and received my license key. What do I do with it? I can't find a place to enter it.

Thanks,

Doug

Firemonkey TVLImageDisplay C++Builder XE3

Sat, 05 Jan 2013 00:12:23 -0500

Gday,

I have a TVLImageDisplay instance aligned alClient on a Firemonkey form. I want to be able to resize this form, but when I do, the TVLImageDisplay resizes differently - seems to be half the new size!

I don't touch the dimensions of the TVLImageDisplay - I resize its containing window. I also tried this with the TVLImageDisplay as a child of a TScaledLayout instance, but that showed the same problem.

Also, I get AV errors with exception class of $C0000005 (screencap attached, I hope )
screencap.jpg (Size: 28.07 KB / Downloads: 3) .

Any clues of where I should be looking, please?

Thanks and regards,
Pat Heuvel

Video display as video source

Sat, 15 Dec 2012 17:24:18 -0500

Hi,

Is there any component I can use to plug in the video screen as a video source ?

Also, I'd like to subtract one video source from another, i.e subtract a known background from another video source. I've looked at VLBackgroundSubtractor but it seems like it splits an image into background and foreground video outputs. So suggestion on which component to use is deeply apprechiated

VLDrawPictureLayer don't show images correctly

Wed, 17 Oct 2012 05:32:03 -0400

Hello:

I need merge an image with video, but I'm using TVLDrawPictureLayer object and picture can't see good..., the image is more short than original size (original size is the same as VLDSImageDisplay). I have test with streech, manual size, auto..., none of configurations work.

In test.jpg attached, you can see the video in background and Image (png with alpha channel) that must be in full window, but you can see a image 2 or 3 times more short than original size.

Please, how I can see the image in original size?.

Thanks!!.

test.jpg (Size: 38.31 KB / Downloads: 3)