Using Qt under linux video capture and recording problems

 This post last edited by the q496713258 on 2011-09-29 10:57:07

recently done under linux video capture project using Qt to develop

has been successfully invoked v4l2 collected a camera to capture images, but camera support the video format is YUYV , the collected images can not be directly saved as jpg image .

now wants to collect real-time image display in Qt program , while recording a video file , how to convert to RGB before YUYV display and video files compressed into it or can be displayed directly , recording into a video ?
In addition to format conversion, save pictures and record video files using any more good ? Ffmpeg? xvid? phonon ( This can not ) ?
Which is more convenient and simple to use it ?

best to use only linux or Qt comes with the library, because this project has been finally to arm platform , ffmeg seemingly want to install some stuff ? Transplantation is not good ?

Which experts had studied ah , seeking guidance ah ~ ~ ~ ~

thank
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this project should be online there is information - a lot of ARM development boards comes with the program, but the code is not publicly available.
landlord search "V4L2 QT webcam" these keywords , see if I can find a point of information .

I had also thought so, but limited capacity , can only use SDL to display images. But I was out of the camera MJPEG format . Saved directly is jpg images.

QT seems to have Image class is the RGB , YUV and RGB conversion do not understand .
I have never written a program to record video , but used the ffmpeg command line tried.

I did transfer MJPEG format JPEG AVI video files , it simply is in accordance with the AVI file format to write data.
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cgi done before the students displayed
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bmp image formats like RGB , and should be the first to add a bmp bmp pictures.
jpg format , then use this library libjpeg try.

- above all not personally practiced .

record video not understand , ffmpeg has this feature , but the code is not easy to understand ah.
If converted to jpeg format , use I said earlier , made mjpeg encoded AVI video files, but the bottleneck is IO speed and camera capture speed.

PS: I also want to look at this time LCD display pictures and camera images are initially learn a variety of image formats, libraries, in the slow progress.


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I only know how to save it as a jpeg encoded video files, if you 've got the picture jpeg encoding , write files directly ( reference AVI file format ) , but ffmpeg does not understand . Not help.
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can say specific? or to the point of information ah

brother , I'm white, ah ~ ~ ~ seeking enlighten ~ ~ ~ ~ ~ ~
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now is YUYV converted to RGB , and ask how to save as a picture file and record video it ?
I tried the next, seemingly still not directly saved as jpg or bmp images

Which heroes know, come quickly appeared, brother in this waiting a long time ~ ~ ~
Continue to seek guidance ~ ~ ~ ~
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so long still no one to it ? ? ?
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Thank you upstairs brother wow ~ ~ ~
recent picture has been kept well, next step is to begin storing video files

recorded video files need to be encoded , how does this encoder to install it ? A lot of people say that when you install ffmpeg will take , but I see how my system already encoder it ? I wanted to make sure the encoder in the end it exists or not . Such recording problems , then you can exclude encoder piece , to find other reasons.
Upstairs Brother
hope to give some guidance ~ ~ ~
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Oh, thank
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landlord do ? Can share what you do for you ? I also do ! Now have no idea ! Seeking advice ! Thank you !
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others have shared you have to do it , what IQ
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format conversion , also did not succeed
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You mean what color space conversion ? Many online source Yeah
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color space conversion is very CPU intensive way , especially in the arm platform, super slow !
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this issue for the landlord , is there a viable option too , know a friend , pointing ah