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Re: Is there an easy way to add text to an mp4 video
Posted: Mon Jan 13, 2014 8:36 pm
by IdeasVacuum
Re: Is there an easy way to add text to an mp4 video
Posted: Mon Jan 13, 2014 9:35 pm
by JHPJHP
Hi IdeasVacuum,
Seems like a great tool, but I don't think it can help in this case... here is some additional information:
- please let me know if I missed something
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- Express is free and enables you to record the screen, sound, webcam, share movies online or save them as Flash and AVI files.
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Re: Is there an easy way to add text to an mp4 video
Posted: Mon Jan 13, 2014 10:04 pm
by normeus
Thanks IdeasVacuum,
Will not work in my case but it looks like a good tool to record all stuff that happens on my screen.
Going back to OpenCV:
when I use "#CV_FOURCC_PROMPT" I am able to choose the right codec and when I use a HEX editor to look at the signature of the AVI file
it shows as "MJPG"
I've tried using CV_FOURCC("F", "F", "V", "1") and also CV_FOURCC("M", "J", "P", "G") but all get is an empty file, is there a way to find out the codec number once it has been picked using "#CV_FOURCC_PROMPT"?
Re: Is there an easy way to add text to an mp4 video
Posted: Mon Jan 13, 2014 10:16 pm
by JHPJHP
Hi normeus,
You can use the following function after calling cvCreateVideoWriter with #CV_FOURCC_PROMPT (-1):
- Debug cvGetCaptureProperty(*capture, #CV_CAP_PROP_FOURCC)
-- #CV_CAP_PROP_FOURCC = 6
Cheers!
Re: Is there an easy way to add text to an mp4 video
Posted: Tue Jan 14, 2014 7:50 am
by normeus
using the following code after a cvCreateVideoWriter
Code: Select all
Debug cvGetCaptureProperty(*capture, #CV_CAP_PROP_FOURCC)
I always get "828601953.0" it does not matter what codec I choose.
let me know if anyone gets a different result.
Re: Is there an easy way to add text to an mp4 video
Posted: Tue Jan 14, 2014 11:42 pm
by JHPJHP
I won't bore you with the number of different things I've tried over the last 4 hours, but you are correct - cvGetCaptureProperty(*capture, #CV_CAP_PROP_FOURCC) is not working as it should.
-
http://www.purebasic.fr/english/viewtop ... 86#p434986
On the bright side I did figure out an issue with the syntax for cvCreateVideoWriter, which should help with your current problem.
- you shouldn't need any additional codecs, and can probably remove ffdshow
- size of the new avi file (with text) should be very close to the size of the original file
Code: Select all
cvCreateVideoWriter(filename.p-ascii, fourcc, fps.d, width, height, is_color)
fps.d = cvGetCaptureProperty(*capture, #CV_CAP_PROP_FPS)
FrameWidth = cvGetCaptureProperty(*capture, #CV_CAP_PROP_FRAME_WIDTH)
FrameHeight = cvGetCaptureProperty(*capture, #CV_CAP_PROP_FRAME_HEIGHT)
*writer = cvCreateVideoWriter(sVideo, CV_FOURCC("D", "I", "V", "X"), fps, FrameWidth, FrameHeight, #True)
Re: Is there an easy way to add text to an mp4 video
Posted: Wed Jan 15, 2014 1:49 am
by normeus
Thank you JHPJHP,
( I spent a few hours myself trying to see where that magic number came from )
to findout the code of the codec I endded up using a program from fourcc.org
http://www.fourcc.org/identifier/
download AVIcodec which will give you the four letter code for the codecs installed on your computer
CV_FOURCC("D", "I", "V", "X")
will only work if you have DIVX installed. which I did and the file is almost the same size as the original files.
the divx I downloaded came from:
http://www.fourcc.org/downloads/divx-912-7/
now to fight "cross dissolve" from file to file, I know it should be an xor of some kind ..
Norm.
Re: Is there an easy way to add text to an mp4 video
Posted: Wed Jan 15, 2014 4:09 am
by JHPJHP
CV_FOURCC("D", "I", "V", "X")
will only work if you have DIVX installed. which I did and the file is almost the same size as the original files.
I don't have it installed, at least not directly; I wonder if it's readily accessible because I have VLC installed?
- CV_FOURCC("D", "I", "V", "X") and most other codecs didn't worked until I fixed the Function syntax (different from the OpenCV documentation), codec loaded or otherwise
AVIcodec:
cvid;Enabled;Cinepak® Codec;1.10.0.11;Radius Inc.;C:\Windows\system32\iccvid.dll
i420;Enabled;Intel Indeo(R) Video YUV Codec;6.1.7600.16385 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\iyuv_32.dll
iyuv;Enabled;Intel Indeo(R) Video YUV Codec;6.1.7600.16385 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\iyuv_32.dll
mrle;Enabled;Microsoft RLE Compressor;6.1.7600.16385 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\msrle32.dll
msvc;Enabled;Microsoft Video 1 Compressor;6.1.7600.16385 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\msvidc32.dll
uyvy;Enabled;Microsoft UYVY Video Decompressor;6.1.7601.17514 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\msyuv.dll
yuy2;Enabled;Microsoft UYVY Video Decompressor;6.1.7601.17514 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\msyuv.dll
yvu9;Enabled;Toshiba Video Codec;6.1.7601.17514 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\tsbyuv.dll
yvyu;Enabled;Microsoft UYVY Video Decompressor;6.1.7601.17514 (win7Microsoft Corporation;Microsoft Corporation;C:\Windows\system32\msyuv.dll
I was using "System Information" (nice find with AVIcodec):
All Programs - Accessories - System Tools > System Information -- System Summary -- Components -- Multimedia -- Video Codecs...
now to fight "cross dissolve" from file to file
Choose any one or a combination of effects in the OpenCV package examples:
- currently set for a 3 second (start) blur-in / (end) blur-out effect
Code: Select all
BlurIn = fps * 3 * 2
BlurOut = 1
Repeat
*image = cvQueryFrame(*capture)
If *image
cvPutText(*image, "JHPJHP", 10, 30, @font, 255, 0, 0, 0)
FramePos.d = cvGetCaptureProperty(*capture, #CV_CAP_PROP_POS_FRAMES)
FrameCount.d = cvGetCaptureProperty(*capture, #CV_CAP_PROP_FRAME_COUNT)
If FramePos <= fps * 3
BlurIn - 2
cvSmooth(*image, *image, #CV_BLUR, BlurIn, 0, 0, 0)
ElseIf FrameCount - FramePos <= fps * 3
BlurOut + 2
cvSmooth(*image, *image, #CV_BLUR, BlurOut, 0, 0, 0)
EndIf
cvWriteFrame(*writer, *image)
cvShowImage(#CV_WINDOW_NAME, *image)
keyPressed = cvWaitKey(10)
Else
Break
EndIf
Until keyPressed = 27 Or ExitCV
Re: Is there an easy way to add text to an mp4 video
Posted: Wed Jan 15, 2014 4:43 am
by normeus
I'll give it a try.
Thank you JHPJHP,
Norm.