BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Re: COMPRESS/DECOMPRESS a TBITMAP using Video For Windows          BorlandTalk.com Forum Index -> Delphi Multimedia View previous topic :: View next topic   Author Message Peter Haas Guest Posted: Fri Aug 01, 2003 6:35 pm    Post subject: Re: COMPRESS/DECOMPRESS a TBITMAP using Video For Windows Hi ?, [email]delphi_tip (AT) yahoo (DOT) com[/email] wrote in <bp5liv0ju4i302mteegpj5vqr9933j98pp (AT) 4ax (DOT) com>: Quote: I am looking for some routines in DELPHI which will COMPRESS/DECOMPRESS a TBITMAP object using a specified codec in Video For Windows (Video Compression Manager). These routines should be tested with the H.263 codec and should allow for codec selection programmatically. This is nonsensically. H.263 is a low bandwith video compression standard, especially for video-conferencing and video-telephony applications. TBitmap contain a still image only. Moreover H.263 encoding/decoding is non trivial and there exist solutions, you don't need to write such a function. The video compression manager can compress a video stream with H.263 if you have installed a VfW H.263 codec. But VfW is a old interface. You should use DirectShow, and install a DirectShow H.263 codec (simple install MS NetMeeting). Also DirectShow support the network streaming. You can find header translations and Delphi components on http://www.progdigy.com Bye Peter. -- Why should we be interested is someone who considers us a waste basket? Robert Marquardt (Team JEDI) in <b4mf4g$u0k$1 (AT) talkto (DOT) net> to me regarding JEDI's disinterest on my contribution attempts. Maybe JEDI users have more interest: http://jediplus.pjh2.de/index.php Back to top delphi_tip@yahoo.com Guest Posted: Fri Aug 01, 2003 10:25 pm    Post subject: Re: COMPRESS/DECOMPRESS a TBITMAP using Video For Windows Hi, Well unfortunately DSPACK is not an option for me, I have used it, I think that Henri did a fantastic job, but I believe that it is still somewhat unstable. I can't really get into DirectShow programming, I need something easy to use. If you have a sample to give me I will pay you for it. On Fri, 01 Aug 2003 20:35:13 +0200, Peter Haas <newsgroupfeedback (AT) pjh2 (DOT) de> wrote: Quote: Hi ?, [email]delphi_tip (AT) yahoo (DOT) com[/email] wrote in [email]bp5liv0ju4i302mteegpj5vqr9933j98pp (AT) 4ax (DOT) com[/email]>: I am looking for some routines in DELPHI which will COMPRESS/DECOMPRESS a TBITMAP object using a specified codec in Video For Windows (Video Compression Manager). These routines should be tested with the H.263 codec and should allow for codec selection programmatically. This is nonsensically. H.263 is a low bandwith video compression standard, especially for video-conferencing and video-telephony applications. TBitmap contain a still image only. Moreover H.263 encoding/decoding is non trivial and there exist solutions, you don't need to write such a function. The video compression manager can compress a video stream with H.263 if you have installed a VfW H.263 codec. But VfW is a old interface. You should use DirectShow, and install a DirectShow H.263 codec (simple install MS NetMeeting). Also DirectShow support the network streaming. You can find header translations and Delphi components on http://www.progdigy.com Bye Peter. Back to top Peter Haas Guest Posted: Fri Aug 01, 2003 10:53 pm    Post subject: Re: COMPRESS/DECOMPRESS a TBITMAP using Video For Windows Hi, [email]delphi_tip (AT) yahoo (DOT) com[/email] wrote in <m1qlivcqg3ra004m866kpncckku098dk2u (AT) 4ax (DOT) com>: Quote: Well unfortunately DSPACK is not an option for me, I have used it, I think that Henri did a fantastic job, but I believe that it is still somewhat unstable. Could you, please, be more specific? Of course at the DSPack forum. The DSPack developer need feedback to improve the library. On the other side, maybe DSPack isn't the reason for the lability, my experience is, the system (e.g. Win98) or some drivers contribute too. Quote: I can't really get into DirectShow programming, I need something easy to use. IMHO DirectShow is the easiest way, all other ways are more complicated. BTW: You can simple test a H.263 filter graph with graphedt.exe. This would be pur DirectShow. Bye Peter. -- Why should we be interested is someone who considers us a waste basket? Robert Marquardt (Team JEDI) in <b4mf4g$u0k$1 (AT) talkto (DOT) net> to me regarding JEDI's disinterest on my contribution attempts. Maybe JEDI users have more interest: http://jediplus.pjh2.de/index.php Back to top delphi_tip@yahoo.com Guest Posted: Sat Aug 02, 2003 9:46 pm    Post subject: Re: COMPRESS/DECOMPRESS a TBITMAP using Video For Windows Coming back to DirectShow and DSPACK, how am I supposed to apply any kind of compression to a bitmap captured from the SampleGrabber ? I know that compression can be applied to an AVI file (you can select the codec) but what about a frame ? On Fri, 01 Aug 2003 18:25:59 -0400, "delphi_tip (AT) yahoo (DOT) com" <delphi_tip (AT) yahoo (DOT) com> wrote: Quote: Hi, Well unfortunately DSPACK is not an option for me, I have used it, I think that Henri did a fantastic job, but I believe that it is still somewhat unstable. I can't really get into DirectShow programming, I need something easy to use. If you have a sample to give me I will pay you for it. On Fri, 01 Aug 2003 20:35:13 +0200, Peter Haas [email]newsgroupfeedback (AT) pjh2 (DOT) de[/email]> wrote: Hi ?, [email]delphi_tip (AT) yahoo (DOT) com[/email] wrote in [email]bp5liv0ju4i302mteegpj5vqr9933j98pp (AT) 4ax (DOT) com[/email]>: I am looking for some routines in DELPHI which will COMPRESS/DECOMPRESS a TBITMAP object using a specified codec in Video For Windows (Video Compression Manager). These routines should be tested with the H.263 codec and should allow for codec selection programmatically. This is nonsensically. H.263 is a low bandwith video compression standard, especially for video-conferencing and video-telephony applications. TBitmap contain a still image only. Moreover H.263 encoding/decoding is non trivial and there exist solutions, you don't need to write such a function. The video compression manager can compress a video stream with H.263 if you have installed a VfW H.263 codec. But VfW is a old interface. You should use DirectShow, and install a DirectShow H.263 codec (simple install MS NetMeeting). Also DirectShow support the network streaming. You can find header translations and Delphi components on http://www.progdigy.com Bye Peter. Back to top Nils Haeck Guest Posted: Sat Aug 02, 2003 11:01 pm    Post subject: Re: COMPRESS/DECOMPRESS a TBITMAP using Video For Windows Hi Tipsy, Most Video compression codecs are only good at processing *video*, not static images. One image is not a video. For the compressors to work properly, they need at least 2 images or even more, because they often look at just the difference between two images. For instance MPEG: MPEG has 3 kinds of frames, I-frame, P-frame and B-frame. The I-frames are complete images, the P-frames are the difference between a frame and an I-frame (so if the image stays exactly the same, the P-frame only contains zeroes). The B-frame is the difference between an interpolation of the I-frame and the next I+P frame, and an intermediate frame. In this jungle, although it is possible to just compress one frame with MPEG, it makes no sense! (MPEG one frame would simply be a JPG, but this holds only for the I-frames). Kind regards, Nils Haeck www.simdesign.nl You wrote in message news:4mboivsaklbep541rlf9a4pc62prepf4bm (AT) 4ax (DOT) com... Quote: Coming back to DirectShow and DSPACK, how am I supposed to apply any kind of compression to a bitmap captured from the SampleGrabber ? I know that compression can be applied to an AVI file (you can select the codec) but what about a frame ? Back to top Peter Haas Guest Posted: Sun Aug 03, 2003 1:21 am    Post subject: Re: COMPRESS/DECOMPRESS a TBITMAP using Video For Windows Hi, [email]delphi_tip (AT) yahoo (DOT) com[/email] wrote in <4mboivsaklbep541rlf9a4pc62prepf4bm (AT) 4ax (DOT) com>: Quote: Coming back to DirectShow and DSPACK, how am I supposed to apply any kind of compression to a bitmap captured from the SampleGrabber ? This is a wrong imagining of DirectShow. You don't need to do this, you don't need the SampleGrabber. The keyword is streaming: On the one end you have a video source filter, e.g. a video file, a capture card or a webcam. Then you have the H.263 encoder filter. On the other end you have a sink filter, e.g. a video window, a file, a network connection. You only need to connect the input of the H.263 encoder filter with the output of the video source filter and his output with the input of the sink filter. How I wrote, you can test this with graphedt.exe, a graphical application for DirectShow. In a application you connect the filters with the method RenderStream. Furthermore information over DirectShow you can find by Microsoft: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/directx/htm/directshow.asp?frame=true A good startpoint would be: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/directx/htm/directshowsystemoverview.asp?frame=true Bye Peter. p.s. Please optimize your quoting, read http://info.borland.com/newsgroups/netiquette.html -- Why should we be interested is someone who considers us a waste basket? Robert Marquardt (Team JEDI) in <b4mf4g$u0k$1 (AT) talkto (DOT) net> to me regarding JEDI's disinterest on my contribution attempts. 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