<![CDATA[Forums - VideoLab]]>

<![CDATA[Forums - VideoLab]]> http://mitov.com/forum/ Sun, 10 May 2026 22:52:08 +0000 MyBB <![CDATA[realtime lags CurrentFrame value]]> http://mitov.com/forum/thread-3606.html Mon, 14 Aug 2017 03:59:46 -0400 http://mitov.com/forum/thread-3606.html
To replicate, have a video say 2000 frames long.
Play it with a VLDSVideoPlayer.
In the player progress event update a label with CurrentFrame.

if you play it at 1x, the label value will get to 2000 as the video ends.
Set the playback rate to 2.5 for example, and the label will get to 2000 and the video will still be playing.

Therefore my video "event" will occur at different frame numbers depending on the playback speed.

I would expect the same 'event' would always be at the same frame number.

thanks,
Mark]]>
To replicate, have a video say 2000 frames long.
Play it with a VLDSVideoPlayer.
In the player progress event update a label with CurrentFrame.

if you play it at 1x, the label value will get to 2000 as the video ends.
Set the playback rate to 2.5 for example, and the label will get to 2000 and the video will still be playing.

Therefore my video "event" will occur at different frame numbers depending on the playback speed.

I would expect the same 'event' would always be at the same frame number.

thanks,
Mark]]> <![CDATA[TVLLAVVideoPlayer playlist ?]]> http://mitov.com/forum/thread-3595.html Sat, 11 Mar 2017 07:49:03 -0500 http://mitov.com/forum/thread-3595.html
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();]]>
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();]]> <![CDATA[Show the VLDSCapture SelectVideoDevice dialog at runtime?]]> http://mitov.com/forum/thread-3503.html Thu, 08 Dec 2016 09:50:53 -0500 http://mitov.com/forum/thread-3503.html
When the application is running, cdVideoCapture and cdVideoCapturePin are the only available dialogs.

Is there a way to have these dialogs available when the application is running?

Alternatively, is there a control/property/function that returns the available video devices (you know, I'm going to ask for audio devices next) that I could put in a list for the user to select?

Current Code:

Code:

procedure TForm1.btnShowDialogClick(Sender: TObject);

var

  myVideoDialogs : VLDSCapture.TVLDSCaptureDialogs;

begin

  myVideoDialogs := VLDSCapture1.AvailableVideoDialogs;

  VLDSCapture1.ShowVideoDialog(VLDSCapture.TVLDSCaptureDialog.cdVideoCapture)​;

end;

Delphi, XE5, VCL 6.0.0.283 Labs....

Thanks!!!]]>
When the application is running, cdVideoCapture and cdVideoCapturePin are the only available dialogs.

Is there a way to have these dialogs available when the application is running?

Alternatively, is there a control/property/function that returns the available video devices (you know, I'm going to ask for audio devices next) that I could put in a list for the user to select?

Current Code:

Code:

procedure TForm1.btnShowDialogClick(Sender: TObject);

var

  myVideoDialogs : VLDSCapture.TVLDSCaptureDialogs;

begin

  myVideoDialogs := VLDSCapture1.AvailableVideoDialogs;

  VLDSCapture1.ShowVideoDialog(VLDSCapture.TVLDSCaptureDialog.cdVideoCapture)​;

end;

Delphi, XE5, VCL 6.0.0.283 Labs....

Thanks!!!]]> <![CDATA[Save a still image on VLDSImageDisplay]]> http://mitov.com/forum/thread-3107.html Sun, 18 Sep 2016 11:13:46 -0400 http://mitov.com/forum/thread-3107.html I capture a camera with VLDSCapture and show directly the frames in a VLDSImageDisplay. If I stop VLDSCapture, I can see a still image (the last frame) in VLDSImageDisplay.
How can I copy this frame/picture into a bitmap (Graphics::TBitmap* picture or TJPEGImage* pJPG picture)?
Thanks for your help!]]> I capture a camera with VLDSCapture and show directly the frames in a VLDSImageDisplay. If I stop VLDSCapture, I can see a still image (the last frame) in VLDSImageDisplay.
How can I copy this frame/picture into a bitmap (Graphics::TBitmap* picture or TJPEGImage* pJPG picture)?
Thanks for your help!]]> <![CDATA[Record Video with VLDSVideologger]]> http://mitov.com/forum/thread-3106.html Thu, 15 Sep 2016 10:19:55 -0400 http://mitov.com/forum/thread-3106.html I trie VLDSVideologger to record a video.
First I enable VLDSCapture to see the picture of my webcam in a VLDSImageDisplay. Then with a "record button" I start recording the webcam as a video.avi file (enable Videologger). To stop recording, I disable Videologger. But it looks that the file video.avi will be finally saved first if the VLDSCapture will be stopped.
Do you have a suggestion how to save the avi file secure and finally without closing the webcam picture in the ImageDisplay (don´t stop the VLDSCapture)?
Thanks!]]> I trie VLDSVideologger to record a video.
First I enable VLDSCapture to see the picture of my webcam in a VLDSImageDisplay. Then with a "record button" I start recording the webcam as a video.avi file (enable Videologger). To stop recording, I disable Videologger. But it looks that the file video.avi will be finally saved first if the VLDSCapture will be stopped.
Do you have a suggestion how to save the avi file secure and finally without closing the webcam picture in the ImageDisplay (don´t stop the VLDSCapture)?
Thanks!]]> <![CDATA[Save me some time, Record MPG]]> http://mitov.com/forum/thread-3102.html Wed, 16 Mar 2016 03:14:28 -0400 http://mitov.com/forum/thread-3102.html
AVI with a codec is too slow to record HD video.]]>
AVI with a codec is too slow to record HD video.]]> <![CDATA[Letting user pick Codec (2)]]> http://mitov.com/forum/thread-3101.html Wed, 24 Feb 2016 08:28:06 -0500 http://mitov.com/forum/thread-3101.html
What I had worked as advertized in Builder 5 but am having trouble with XE5. Managed to figure out how to get a list of the installed Codecs and put the names into a string list.

In Builder 5 The following worked.

TVLVideoCompressionItems *CompItems;
TVLVideoCompressionItem *CompItem;

// Put available compressor names in a string list
VLAVILogger1->Compression->Compressions->GetAvailableCompressions(CodecStrList, ciDescription);

// Populate CompItems
CompItems = VLAVILogger1->Compression->Compressions;
CompItems->Clear();
CompItem = CompItems->Add();

// set compressor to 2nd item in list (for example)
CompItem->Compressor = CodecStrList->Strings[1];

That was it, not sure how the Logger knew that CompItem was the compressor it needed to use but it worked. Same code in XE5 with newer VideoLab doesn't work. The captured video isn't using the assigned codec.]]>
What I had worked as advertized in Builder 5 but am having trouble with XE5. Managed to figure out how to get a list of the installed Codecs and put the names into a string list.

In Builder 5 The following worked.

TVLVideoCompressionItems *CompItems;
TVLVideoCompressionItem *CompItem;

// Put available compressor names in a string list
VLAVILogger1->Compression->Compressions->GetAvailableCompressions(CodecStrList, ciDescription);

// Populate CompItems
CompItems = VLAVILogger1->Compression->Compressions;
CompItems->Clear();
CompItem = CompItems->Add();

// set compressor to 2nd item in list (for example)
CompItem->Compressor = CodecStrList->Strings[1];

That was it, not sure how the Logger knew that CompItem was the compressor it needed to use but it worked. Same code in XE5 with newer VideoLab doesn't work. The captured video isn't using the assigned codec.]]> <![CDATA[Best way to time a video recording]]> http://mitov.com/forum/thread-3100.html Tue, 23 Feb 2016 10:32:45 -0500 http://mitov.com/forum/thread-3100.html What is the best way to accurately time a video recording. I am trying to use a TTimer ticking off seconds and counting down from some value. When the counter reaches 0, I call a function that closes the logger and saves the file.

It works but the resulting video file isn't as long as One would think it should be.

Setting the count for 30 seconds results in roughly a 22 second recording and setting the count for 60 seconds results in a 43 second video. On another faster computer the 60 second setting results in a 30 second video.

Must be some stuff going on in the capture and Logger threads that are independent of actual time.]]> What is the best way to accurately time a video recording. I am trying to use a TTimer ticking off seconds and counting down from some value. When the counter reaches 0, I call a function that closes the logger and saves the file.

It works but the resulting video file isn't as long as One would think it should be.

Setting the count for 30 seconds results in roughly a 22 second recording and setting the count for 60 seconds results in a 43 second video. On another faster computer the 60 second setting results in a 30 second video.

Must be some stuff going on in the capture and Logger threads that are independent of actual time.]]> <![CDATA[Installed in XE5 but no V.L. componets?]]> http://mitov.com/forum/thread-3099.html Wed, 17 Feb 2016 05:38:37 -0500 http://mitov.com/forum/thread-3099.html <![CDATA[Grab the first 3 or 4 frames from video file]]> http://mitov.com/forum/thread-3098.html Mon, 15 Feb 2016 09:20:05 -0500 http://mitov.com/forum/thread-3098.html I would like to open an AVI video file then grab and save the first 3 or 4 frames as image files. I won't need to display the video just grab the frames and close the file.

Any ideas on how to do this would be appreciated.]]> I would like to open an AVI video file then grab and save the first 3 or 4 frames as image files. I won't need to display the video just grab the frames and close the file.

Any ideas on how to do this would be appreciated.]]> <![CDATA[Streaming of video and voice]]> http://mitov.com/forum/thread-3093.html Thu, 10 Sep 2015 16:02:16 -0400 http://mitov.com/forum/thread-3093.html
Basically, I would like to make a chat room a-la Camfrog/PalTalk (but with a better business model which does not suck every penny out of customers...).

So, I need the following:

- Video streaming
- Audio Streaming

For both rooms and P2P.

I think I can do everything with these components, I am just not sure about the following things:

1) What components I need for video/audio streaming
2) What are the best practices to create code that works for both rooms and P2P. I think that, for the room, I need some kind of middle server - or is it just another client that then broadcasts? I gather that, if that were the case, it'd be just a case of getting the pins right, am I deluded?
3) Ideally, I'd like to be ahead of the game and would like to know how I can make the stereomix less of a pain for users regardless of the OS.
4) For Audio, it'd be interesting a filter that makes voice clearer (Audacity does this, but I am a noob and I have no idea how easy it is to do when you are streaming, I am not sure it's an easy or fast process).

Thank you for your time!

A]]>
Basically, I would like to make a chat room a-la Camfrog/PalTalk (but with a better business model which does not suck every penny out of customers...).

So, I need the following:

- Video streaming
- Audio Streaming

For both rooms and P2P.

I think I can do everything with these components, I am just not sure about the following things:

1) What components I need for video/audio streaming
2) What are the best practices to create code that works for both rooms and P2P. I think that, for the room, I need some kind of middle server - or is it just another client that then broadcasts? I gather that, if that were the case, it'd be just a case of getting the pins right, am I deluded?
3) Ideally, I'd like to be ahead of the game and would like to know how I can make the stereomix less of a pain for users regardless of the OS.
4) For Audio, it'd be interesting a filter that makes voice clearer (Audacity does this, but I am a noob and I have no idea how easy it is to do when you are streaming, I am not sure it's an easy or fast process).

Thank you for your time!

A]]> <![CDATA[Save Individual Frames from Video]]> http://mitov.com/forum/thread-3092.html Thu, 23 Jul 2015 18:31:11 -0400 http://mitov.com/forum/thread-3092.html Any help, hint will be appreciated.
Thanks.]]> Any help, hint will be appreciated.
Thanks.]]> <![CDATA[Sound not synced with video when recording]]> http://mitov.com/forum/thread-3086.html Mon, 19 Jan 2015 05:34:12 -0500 http://mitov.com/forum/thread-3086.html
In testing the Webcam the delayed audio problem came back. I am suspecting I do not understand enough about video compression and audio compression and how they both relate to a compression codec. I am using the freeware Xvid codec for video but do not have Audio compression enabled. Am suspecting this is what is throwing off the timing between video and audio.

Do video codec's always also do audio compression and do I need to set the Audio Compressor to the codec when I set the Video Compressor? Help me understand how this works?]]>
In testing the Webcam the delayed audio problem came back. I am suspecting I do not understand enough about video compression and audio compression and how they both relate to a compression codec. I am using the freeware Xvid codec for video but do not have Audio compression enabled. Am suspecting this is what is throwing off the timing between video and audio.

Do video codec's always also do audio compression and do I need to set the Audio Compressor to the codec when I set the Video Compressor? Help me understand how this works?]]> <![CDATA[TVLDSVideoPlayer what formats?]]> http://mitov.com/forum/thread-3085.html Sun, 21 Dec 2014 07:22:33 -0500 http://mitov.com/forum/thread-3085.html
Thanks

Never mind found it in the FAQ..

Q: Does VideoLab support the format of my Video Files?

A: VideoLab supports both Win32 API and DirectShow technologies. Win32 API will allow you to play only AVI files. If you decide to use DirectShow VideoLab will use any DirectShow filter available on your system. If you have a DirectShow filter for a particular video format VideoLab will recognize the format and use the proper filter. This means that VideoLab is capable of using any format available today. If you have a file that you can’t play in VideoLab, it means that you probably don’t have the proper DirectShow filter. Please search the web and download the filter needed for the particular format.]]>
Thanks

Never mind found it in the FAQ..

Q: Does VideoLab support the format of my Video Files?

A: VideoLab supports both Win32 API and DirectShow technologies. Win32 API will allow you to play only AVI files. If you decide to use DirectShow VideoLab will use any DirectShow filter available on your system. If you have a DirectShow filter for a particular video format VideoLab will recognize the format and use the proper filter. This means that VideoLab is capable of using any format available today. If you have a file that you can’t play in VideoLab, it means that you probably don’t have the proper DirectShow filter. Please search the web and download the filter needed for the particular format.]]> <![CDATA[Custom Video Compression Filter]]> http://mitov.com/forum/thread-3083.html Sun, 14 Dec 2014 03:22:01 -0500 http://mitov.com/forum/thread-3083.html
I'm triying to develope a custom video compression filter using a VLGenericFilter on ProcessData I'm able to compress the frame succesfully(I have tested that this is donde correctly decompessing the frame), the result of compression is return in a TMemoryStream, how can I write the compressed data to the OutBuffer var?

I have tested the following but I get and AV.

P := OutBuffer.Write;
CompStream.Read(P,CompSize);

Thanks In advance,

Omar Zelaya]]>
I'm triying to develope a custom video compression filter using a VLGenericFilter on ProcessData I'm able to compress the frame succesfully(I have tested that this is donde correctly decompessing the frame), the result of compression is return in a TMemoryStream, how can I write the compressed data to the OutBuffer var?

I have tested the following but I get and AV.

P := OutBuffer.Write;
CompStream.Read(P,CompSize);

Thanks In advance,

Omar Zelaya]]> <![CDATA[Video streaming]]> http://mitov.com/forum/thread-3082.html Thu, 11 Dec 2014 02:16:17 -0500 http://mitov.com/forum/thread-3082.html
I need to develope a video streaming app, any hint how can this be acomplished? what components can I use to play video on remote location with audio/video sync.

I have seen that other SDKs use a multiplexer for video/audio stream on sender side and a demutiplexer on receive side.

Thanks in advance,

Omar Zelaya]]>
I need to develope a video streaming app, any hint how can this be acomplished? what components can I use to play video on remote location with audio/video sync.

I have seen that other SDKs use a multiplexer for video/audio stream on sender side and a demutiplexer on receive side.

Thanks in advance,

Omar Zelaya]]> <![CDATA[Play video from Memory Stream]]> http://mitov.com/forum/thread-3081.html Mon, 17 Nov 2014 09:32:03 -0500 http://mitov.com/forum/thread-3081.html
I am working with the Canon SDK and trying to display a live view image. The camera and SDK sends the live view image out as a JPEG stream. I need to decompress and display it as it comes in. All I have to work with is a pointer to the beginning of the memory stream and a size variable. I'm not exactly sure what the size variable is telling me, may contain the size of each frame.

I know I will need a VLDSImageDisplay control but not sure what I need to put in front of it to grab the stream and decompress the JPEG video so I can display it.

I'm researching exactly what encoding is used for the JPEG stream but am thinking whatever control we end up using will be able to handle whatever it is. I will also look at the Buffer control suggested in the other thread but suspect it won't decode the video.

Any ideas and Thanks...

EDIT: May have a bigger issue with trying to use Video Lab for this. I'm using an older version (4.5 ) with Builder 5 and looks like I don't have a IVLImageBuffer component. Can any of the controls in version 4.5 accept input from a memory stream?]]>
I am working with the Canon SDK and trying to display a live view image. The camera and SDK sends the live view image out as a JPEG stream. I need to decompress and display it as it comes in. All I have to work with is a pointer to the beginning of the memory stream and a size variable. I'm not exactly sure what the size variable is telling me, may contain the size of each frame.

I know I will need a VLDSImageDisplay control but not sure what I need to put in front of it to grab the stream and decompress the JPEG video so I can display it.

I'm researching exactly what encoding is used for the JPEG stream but am thinking whatever control we end up using will be able to handle whatever it is. I will also look at the Buffer control suggested in the other thread but suspect it won't decode the video.

Any ideas and Thanks...

EDIT: May have a bigger issue with trying to use Video Lab for this. I'm using an older version (4.5 ) with Builder 5 and looks like I don't have a IVLImageBuffer component. Can any of the controls in version 4.5 accept input from a memory stream?]]> <![CDATA[Play Video Directly from TMemoryStream]]> http://mitov.com/forum/thread-3073.html Mon, 14 Jul 2014 17:51:28 -0400 http://mitov.com/forum/thread-3073.html
Thanks in advance.]]>
Thanks in advance.]]> <![CDATA[Help Files Missing After Install]]> http://mitov.com/forum/thread-3072.html Sun, 13 Jul 2014 10:08:27 -0400 http://mitov.com/forum/thread-3072.html
1. I started Delphi XE4
2. Opened the VLVideoCompression.dproj project.
3. Set focus on the VLVideoCompressor1 component
4. Pressed F1.

I got Embarcadero's TCustomControl help screen (see image)

Where are the help files and/or documentation for this product?

.png

VideoLab - Missing Help Files.png (Size: 170.84 KB / Downloads: 1) ]]>
1. I started Delphi XE4
2. Opened the VLVideoCompression.dproj project.
3. Set focus on the VLVideoCompressor1 component
4. Pressed F1.

I got Embarcadero's TCustomControl help screen (see image)

Where are the help files and/or documentation for this product?

.png

VideoLab - Missing Help Files.png (Size: 170.84 KB / Downloads: 1) ]]> <![CDATA[Show Codec dialog with VLAVILogger]]> http://mitov.com/forum/thread-3069.html Thu, 26 Jun 2014 05:03:43 -0400 http://mitov.com/forum/thread-3069.html
When my project was using VLDSVideoLogger I was able to show the Codec settings dialog using this...

Code:

VLDSVideoLogger1->VideoCompression->Compressions->Items[0]->ShowDialog();

Now that I have switched to VLAVILogger it doesn't work even with using the proper names.

Code:

VLAVILogger1->Compression->Compressions->Items[0]->ShowDialog();

I have tried everything I can think of and mostly get ShowDialog is not a member of TVLVideoCompressionItem.

I could add a VLDSVideoLogger just so I can show the Codec Dialog but if I can do it with VLAVILogger it would be cleaner, what am I missing?]]>
When my project was using VLDSVideoLogger I was able to show the Codec settings dialog using this...

Code:

VLDSVideoLogger1->VideoCompression->Compressions->Items[0]->ShowDialog();

Now that I have switched to VLAVILogger it doesn't work even with using the proper names.

Code:

VLAVILogger1->Compression->Compressions->Items[0]->ShowDialog();