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  • Making a video with opencv and ffmpeg. How to find the right color format?

    - by luc
    I have a webcam video recorder program built with python, opencv and ffmpeg It works ok except that the color of the video is more blue than the reality. The problem seems to come from color format of images. It seems that OpenCv is giving BGR images and ffmpeg+libx264 is expecting YUV420p. I've read that YUV420p correspond to YCbCr. opencv has no conversion from BGR to YCbCr. It only has a conversion to YCrCb. I have made some searchs and tried different alternatives to try converting opencv image to something that could be ok for ffmpeg+libx264. None is working. At this point, I am a bit lost and I would appreciate any pointer that could help me to fix this color issue.

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  • DV-AVI in DivX Plus Player and VirtualDub - playback issue

    - by user714965
    I have an AVI-video which I had (digitally) transferred from a DV camera to my PC. The video contains errors at the beginning most likely because the DV tape was pretty old. When playing this video in the DivX Plus Player I get some picture artefacts and some high noise peaks of the sound. These stops after two seconds. When I'm playing this video in VirtualDub (where I want to cut it) I get the same picture artefacts. But the sound errors (those loud high peaks) lasts ten seconds. These sound errors are also contained in the cutted video. Why does the video have more errors when played in VirtualDub? I think because of different codecs which are used for decoding the video? How can I change the codec which VirtualDub uses for decoding? I have installed ffdshow for this but it seems that it is not used because I don't get the ffdshow icon in the taskbar when playing the video in VirtualDub. When playing in DivX Player Plus I get this icon.

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  • mplayer (mplayerhq.hu) repeats ending audio frames

    - by kamikatze
    mplayer (from mplayerhq.hu) on windows repeats the last few audio frames upon exit. When the video ends, before you can see Exiting... (End of file) in the command prompt, you will hear the last 1/2 second or so of the audio track again. This behavior is the same for multiple containers/codecs/soundcards Vista or Windows 7. Is there a workaround for this? My playback specs: MPlayer Sherpya-MT-SVN-r31027-4.2.5 (C) 2000-2010 MPlayer Team 150 audio & 343 video codecs Playing splash_final.wmv. ASF file format detected. [asfheader] Audio stream found, -aid 1 [asfheader] Video stream found, -vid 2 VIDEO: [WMV3] 1280x720 24bpp 1000.000 fps 6291.5 kbps (768.0 kbyte/s) ========================================================================== Opening video decoder: [dmo] DMO video codecs DMO dll supports VO Optimizations 0 1 DMO dll might use previous sample when requested Decoder supports the following formats: YV12 YUY2 UYVY YVYU RGB8 [..] Decoder is capable of YUV output (flags 0x1b) Movie-Aspect is undefined - no prescaling applied. VO: [directx] 1280x720 = 1280x720 Planar YV12 Selected video codec: [wmv9dmo] vfm: dmo (Windows Media Video 9 DMO) ========================================================================== ========================================================================== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders AUDIO: 44100 Hz, 2 ch, s16le, 329.8 kbit/23.37% (ratio: 41221-176400) Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg)) ========================================================================== AO: [dsound] 44100Hz 2ch s16le (2 bytes per sample) Starting playback...

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  • Is it OK to use images of GPD'd code in a CC 3.0 BY video?

    - by marcusw
    I am making a video in which I would like to use pictures of some Linux Kernel code. I am looking to release the finished product under the CC 3.0 BY license, but the Kernel is released under the GPL, which would not allow this if the code is in text format. However, since it will be in low-resolution, incredibly incomplete, non-usable, non-compilable, non-editable (at least without lots of finagling) format, would this constitute fair use or find another loophole to slip through? Thanks for the help, I will understand if this is considered off topic.

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  • Is it OK to use images of GPL'd code in a CC 3.0 BY video?

    - by marcusw
    I am making a video in which I would like to use pictures of some Linux Kernel code. I am looking to release the finished product under the CC 3.0 BY license, but the Kernel is released under the GPL, which would not allow this if the code is in text format. However, since it will be in low-resolution, incredibly incomplete, non-usable, non-compilable, non-editable (at least without lots of finagling) format, would this constitute fair use or find another loophole to slip through? Thanks for the help, I will understand if this is considered off topic.

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  • How to play an MKV 3D side-by-side video?

    - by djechelon
    I have a video in Matroska format (MKV, file extension .mkv), 3D half-SBS, where the 1280x720 frame shows the left-eye frame on the left and the right-eye frame on the right. I don't have a 3DTV, but I have NVidia 3D Vision: I tried to open it with PowerDVD 10 with no result (program hangs). With the same PowerDVD, I tried to play the Avatar 3D trailer downloaded from YouTube (MP4 format), but it now shows it the two frames. PowerDVD 10 is advertised to support 3D and 3D Vision. Why can't I play these videos? NVidia Stereoscopic player plays the Avatar trailer fine, but it doesn't support MKV.

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  • Is there a way to make AutoGK to resize the video?

    - by Jian Lin
    AutoGK is so far a good tool for converting video clips in DVD-R disc into .avi to post to YouTube. But I captured some Wii game play, and it is 16 : 9 ratio, but AutoGK only output the .avi in 4 : 3 ratio. Is there actually a way to tweak it to output the avi as 16 : 9? Otherwise, I need to run VirtualDub and download DivX codec to run it again to resize it 16 : 9. Any way this is done, or any other recommendations? thanks for helping.

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  • TV video constantly skips 1/2 second, plays 1 second; green on bottom

    - by Robert
    I just got DirecTV. It worked for a day, but now the TV video constantly skips 1/2 second, then plays 1 second. Also, the bottom 5th of the screen is solid green. The audio does not skip. I tried to do "Set up TV signal" (in Media Center) - but I get an error. See the post I just made here titled "Error - “IR Hardware not detected” - but it’s installed/working." Thanks for your help.

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  • Where to find a list of online TV/video/Webcam sources ?

    - by Frank
    I know there are lots of web sites that offer online TV/Stream viewing, such as : http://tvunetworks.com , http://www.hulu.com/ and more, but the source of their streams are usually well hidden, I wonder if there is any open source project that collects the online TV/video/Webcam sources so that TV stations and individuals can publicly list their stream source in the following format, you can copy the urls below into a browser and start watching : Greek TV|mms://eu02.egihosting.com/938657?MSWMExt=.asf Turkish TV|http://www.bizidinle.com/player/SAlone.asp?id=7 Even if there is no public open source project, is there any where that I can find such a list so that I can get to the stream urls ?

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  • How to batch convert video files on OSX for AppleTV2 / iPhone4?

    - by Luke404
    I'd like to have a solution to batch convert video files to a format suitable for the AppleTV2, iPad2, iPhone4, while at the same time preserving as much quality as possible; I want a single output file that will play on both devices and also good for consumption by other Mac software (eg. Aperture, iMovie, iTunes). Batch processing is a requirement since I'm gonna convert many many files from different sources (mainly lots of videos captured by compact digital cameras, cell phones, and so on). I'm looking into ffmpeg and MEncoder (both installed via MacPorts), but I can't seem to find a suitable preset for libx264 even if everyone out there is talking about them. A different approach involving different software would be ok too as long as I can script it somehow and run it on a whole directory full of files to be converted.

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  • How to make a video card use DVI output by default in text mode?

    - by Igor Zinov'yev
    I have an ASUS ENGT440/DI1GD5 video card which has three outputs: DVI, D-Sub and HDMI. I am using both D-Sub and DVI, but my main monitor is connected to the DVI output. Everything works fine except for the text mode. The card somehow uses the D-Sub output in text mode when both monitors are connected (when I disconnect the D-Sub output and leave only the primary monitor connected to the DVI output, it's being used correctly). How do I make the card use only the DVI output (or both) in text mode?

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  • Looking for a video media player program that saves colour/volume profiles for individual videos?

    - by verve
    I use VLC right now but I'm tired of having 24 VLC players open because I watch that many different things each week so I just leave them open indefinitely; having to set each one up with the different colour/brightness/volume when the computer crashes is time-consuming. Also, having those many players open gets crazy. Is a good video media player available that lets you create or save profiles for videos watched or going to watched such as colour/brightness/volume? Windows 7 64-bit. Freeware or paid?

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  • Can you use a DVI-VGA Adapter on a monitor instead of a video card?

    - by Joel Coehoorn
    I suspect the answer to this is "no", but here goes: I have a monitor with inputs for DVI and VGA. I want to be able to share this display with two computers (one at a time, of course) that both have VGA only. I also have a DVI-VGA dongle that came with a video card that's in a different computer. Can I connect this dongle directly to the DVI port on the monitor so that I can connect both VGA computers? I'd rather not resort to a kvm.

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  • Hardware question re Hauppauge WinTV-HVR 900 HD video/tv capture unit used with laptop with HDMI output laptop HDMI connection

    - by Bill
    I've ordered a Hauppauge WinTV-HVR 900 HD video/tv capture unit. It is mainly for use with my HP desktop running Windows 7 Professional, but I will want to use it occasionally with my partner's HP laptop running Vista Home Premium. The latter has an HDMI output which works perfectly with my LG 42" LCD TV, enabling display of BBC iPlayer and other catchup services. Will the live or recorded HD signal from the WinTV-HVR 900 HD connected to the laptop's USB input be output on the laptop's HDMI socket as HD? Come to that, will SD content be output? The reason I ask is that I had a problem with a Pinnacle unit which displayed OK on the laptop's screen but not on the TV screen (which did display all the normal Windows material). I've tried the Hauppage website, but it doesn't even acknowledge the existence of the WinTV-HVR 900 HD!

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  • Connecting Samsung Note 3 to Hitachi CPX3030WN via Samsung MHL 2.0 HD kit , Will there be video output? [on hold]

    - by Monolord's Knight
    I need the video output to projector. but nobody can assure me this may work or not. some says yes some says no.But they have no real experience. Some says an special android app is required for this. Depending on this answer, I will purchase Samsung MHL 2.0 cable . If it wont work it will be no use for me. I don't have a way to change my phone or projector. Just want to know will it work or not. Thanks

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  • Images from url to listview

    - by Andres
    I have a listview which I show video results from YouTube. Everything works fine but one thing I noticed is that the way it works seems to be a bit slow and it might be due to my code. Are there any suggestions on how I can make this better? Maybe loading the images directly from the url instead of using a webclient? I am adding the listview items in a loop from video feeds returned from a query using the YouTube API. The piece of code which I think is slowing it down is this: Feed<Video> videoFeed = request.Get<Video>(query); int i = 0; foreach (Video entry in videoFeed.Entries) { string[] info = printVideoEntry(entry).Split(','); WebClient wc = new WebClient(); wc.DownloadFile(@"http://img.youtube.com/vi/" + info[0].ToString() + "/hqdefault.jpg", info[0].ToString() + ".jpg"); string[] row1 = { "", info[0].ToString(), info[1].ToString() }; ListViewItem item = new ListViewItem(row1, i); YoutubeList.Items.Add(item); imageListSmall.Images.Add(Bitmap.FromFile(info[0].ToString() + @".jpg")); imageListLarge.Images.Add(Bitmap.FromFile(info[0].ToString() + @".jpg")); } public static string printVideoEntry(Video video) { return video.VideoId + "," + video.Title; } As you can see I use a Webclient which downloads the images so then I can use them as image in my listview. It works but what I'm concerned about is speed..any suggestions? maybe a different control all together?

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  • How to store a captured image into MySQL database using JavaScript

    - by R J.
    I am capturing image using canvas and i want to store a captured image in MySQL Database using Javascript. This is my code: <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, maximum-scale=1.0"> <style> body {width: 100%;} canvas {display: none;} </style> <title>Instant Camera - Remote</title> <script> var video, canvas, msg; var load = function () { video = document.getElementById('video'); canvas = document.getElementById('canvas'); msg = document.getElementById('error'); if( navigator.getUserMedia ) { video.onclick = function () { var context = canvas.getContext("2d"); context.drawImage(video, 0, 0, 240, 320); var image1 = canvas.toDataURL("image/png"); document.write('<img src="' + image1 + '" />'); }; } else { msg.innerHTML = "Native web camera not supported :("; } }; window.addEventListener('DOMContentLoaded', load, false); </script> </head> <body> <video id="video" width="240" height="320" autoplay> </video> <p id="error">Click on the video to send a snapshot to the receiving screen</p> <canvas id="canvas" width="240" height="320"> </canvas> </body> </html>

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  • Mplayer can't play *.wmv file

    - by Jimmy
    I have a problem when I use the mplayer to play *.wmv file on my ubuntu11.10. There are some error messages here. Could anyone can help me solve this problem. I use some keyword to search in Gooele, but I can't find the answer. Thank you. Playing testmovie.wmv. ASF file format detected. [asfheader] Audio stream found, -aid 1 [asfheader] Video stream found, -vid 2 VIDEO: [WMV3] 1280x720 24bpp 1000.000 fps 4000.0 kbps (488.3 kbyte/s) Load subtitles in ./ open: No such file or directory [ MGA] Couldn't open: /dev/mga_vid open: No such file or directory [MGA] Couldn't open: /dev/mga_vid [VO_TDFXFB] Can't open /dev/fb0: Permission denied. [VO_3DFX] Unable to open /dev/3dfx. [vdpau] Error when calling vdp_device_create_x11: 1 ========================================================================== Opening video decoder: [dmo] DMO video codecs DMO dll supports VO Optimizations 0 1 DMO dll might use previous sample when requested MPlayer interrupted by signal 11 in module: init_video_codec I am using xv as my video driver.

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  • How Fiber Optic Cables Are Made and Laid Across the Sea [Science]

    - by Jason Fitzpatrick
    We don’t know about you but yesterday’s video about how fiber optic cables work just made us more curious. Check out how the cables are made and laid across the sea. In the above video we see how fiber optic strands are manufactured, including how the draw tower mentioned in yesterday’s video works. Once the strands are manufactured, where do they go and how are they used? In the video below we see Alcatel-Lucent’s Ile de Sein, one of the largest and most powerful cable laying ships in the world. Check out the video to see cable storage wells that look like small stadiums. Finding out how the cables are made and what kind of planning and machinery it takes to lay them across the ocean is just as interesting as how they work. How It’s Made: Fiber Optics [YouTube] Undersea Cable [YouTube] What is a Histogram, and How Can I Use it to Improve My Photos?How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is Compromised

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  • How do I install the Intel Graphics driver in my system?

    - by John
    Can someone help me out and explain or point me in the right direction on how to check video drivers and see if my video card running okay? I had 10.04 installed on my Thinkpad r61 with Compiz Manager and life was great, until the machine took water damage. I bought an ASUS (X54H) since and am trying out 12.04, but the desktop just doesn't look right. I always struggled with video driver installation. There are no proprietary drivers available in the hardware manager. When I run lspci | grep VGA: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) I will greatly appreciate your help. I want to use Linux more, but like I said video drivers appear to be my biggest concern. I have also tried 12.04 on my desktop PC, but again failed to configure video card, so switched back to Windows 7.

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  • Form Validation, Dependant Drop Downs, Data Level Security in OWS for DotNetNuke - 5 Videos

    In this tutorial we demonstrate some very advanced techniques for building a car parts application in Open Web Studio. Throughout the tutorial we cover form input, validation, how to use dependant drop down lists, populating checkbox lists and introduce a new concept of data level security. Data level security allows you to control which data a user can access within a module. The videos contain: Video 1 - How to Setup Form Validation Video 2 - Car Parts Application, Assigning Security Roles into a Global Session Variable Video 3 - How to Build the Categories Module with Data Level Security Video 4 - How to Build the SubCategories Module and Use SubQuery Video 5 - How to Build the Car Parts List Module Total Time Length: 44min 19secsDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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