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Autres articles (26)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

Sur d’autres sites (4516)

  • Correct Complex Lens Distortion in FFMPEG (or OpenCV) [closed]

    29 septembre 2024, par C.M.

    I need to process videos which were taken with a wide angle vehicle camera. A good example is this frame from a video :

    


    Original Image

    


    As you can see, the image is pretty distorted and I need to correct that. After some research, neither a Barrel distortion or a Pincushion distortion is the case here. I'd say it depends on the axis. The x axis seems to have a Pincushion distortion, but the y axis seems to have a Barrel distortion.

    


    In my project I use a Java backend and I use FFmpeg to process the videos (re-encoding, color correction, ...). Therefore I'd like to do this in FFmpeg as another video filter.

    


    I tried to use the lenscorrection filter but couldn't find any suitable values for k1 and k2. IMHO this isn't even possible since the filter can only handle the two types of distortion mentioned above. Here are two examples where I tried to correct the horizontal and vertical elements of the image :

    


    k1= -0.7, k2=0.4

    


    (with k1= -0.7, k2=0.4)

    


    k1=0.7

    


    (with k1=0.7)

    


    But the resulting image would need to look like this (just roughly edited with GIMP) :

    


    How it should look like

    


    Is this even possible with FFmpeg filters ? I already tried out the v360 filter (similar like in this article) but just achieved similar results.

    


    If I'm correct this isn't possible with video filters. So I thought of doing this in OpenCV in Java by extracting all the frames with FFmpeg, transforming them with OpenCV and rendering them to a video again. Unfortunately I have no experience with OpenCV and couldn't get any results. I think this should be possible in some way.

    


    Can someone help me ?

    


  • Webcam streaming from Mac using FFmpeg

    13 décembre 2019, par Galaxy

    I want to stream my webcam from Mac using FFmpeg.

    First I checked the supported devices using ffmpeg -f avfoundation -list_devices true -i ""

    Output :

    [AVFoundation input device @ 0x7fdf1bd03000] AVFoundation video devices:
    
[AVFoundation input device @ 0x7fdf1bd03000] [0] USB 2.0 Camera #2
    
[AVFoundation input device @ 0x7fdf1bd03000] [1] FaceTime HD Camera
    
[AVFoundation input device @ 0x7fdf1bd03000] [2] Capture screen 0
    
[AVFoundation input device @ 0x7fdf1bd03000] [3] Capture screen 1
    
[AVFoundation input device @ 0x7fdf1bd03000] AVFoundation audio devices:
    
[AVFoundation input device @ 0x7fdf1bd03000] [0] Built-in Microphone

    The device[0] is the webcam I want to use.

    Then I tried to capture the webcam using ffmpeg -f avfoundation -i "0" out.mpg

    Output :

    [avfoundation @ 0x7fe7f3810600] Selected framerate (29.970030) is not supported by the device
    
[avfoundation @ 0x7fe7f3810600] Supported modes:
    
[avfoundation @ 0x7fe7f3810600]   320x240@[120.101366 120.101366]fps
    
[avfoundation @ 0x7fe7f3810600]   640x480@[120.101366 120.101366]fps
    
[avfoundation @ 0x7fe7f3810600]   800x600@[60.000240 60.000240]fps
    
[avfoundation @ 0x7fe7f3810600]   1024x768@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   1280x720@[60.000240 60.000240]fps
    
[avfoundation @ 0x7fe7f3810600]   1280x1024@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   1920x1080@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   320x240@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   640x480@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   800x600@[20.000000 20.000000]fps
    
[avfoundation @ 0x7fe7f3810600]   1024x768@[6.000002 6.000002]fps
    
0: Input/output error

    After that, I tried stream this webcam from my Mac using ffmpeg -f avfoundation -framerate 30 -i "0" -f mpeg1video -b 200k -r 30 -vf scale=1920:1080 http://127.0.0.1:8082/

    Output :

    [avfoundation @ 0x7f8515012800] An error occurred: The activeVideoMinFrameDuration passed is not supported by the device.  Use -activeFormat.videoSupportedFrameRateRanges to discover valid ranges.0: Input/output error

    I cannot capture or stream this webcam. However when I used the Facetime camera instead of this webcam, everything was OK. I’ve been searching for this problem for a few days, but still cannot fix it. Does anyone have experience with webcam and FFmpeg on Mac ?

  • Webcam streaming from Mac using FFmpeg

    22 juillet 2016, par Galaxy

    I want to stream my webcam from Mac using FFmpeg.

    First I checked the supported devices using ffmpeg -f avfoundation -list_devices true -i ""

    Output :

    [AVFoundation input device @ 0x7fdf1bd03000] AVFoundation video devices:
    
[AVFoundation input device @ 0x7fdf1bd03000] [0] USB 2.0 Camera #2
    
[AVFoundation input device @ 0x7fdf1bd03000] [1] FaceTime HD Camera
    
[AVFoundation input device @ 0x7fdf1bd03000] [2] Capture screen 0
    
[AVFoundation input device @ 0x7fdf1bd03000] [3] Capture screen 1
    
[AVFoundation input device @ 0x7fdf1bd03000] AVFoundation audio devices:
    
[AVFoundation input device @ 0x7fdf1bd03000] [0] Built-in Microphone

    The device[0] is the webcam I want to use.

    Then I tried to capture the webcam using ffmpeg -f avfoundation -i "0" out.mpg

    Output :

    [avfoundation @ 0x7fe7f3810600] Selected framerate (29.970030) is not supported by the device
    
[avfoundation @ 0x7fe7f3810600] Supported modes:
    
[avfoundation @ 0x7fe7f3810600]   320x240@[120.101366 120.101366]fps
    
[avfoundation @ 0x7fe7f3810600]   640x480@[120.101366 120.101366]fps
    
[avfoundation @ 0x7fe7f3810600]   800x600@[60.000240 60.000240]fps
    
[avfoundation @ 0x7fe7f3810600]   1024x768@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   1280x720@[60.000240 60.000240]fps
    
[avfoundation @ 0x7fe7f3810600]   1280x1024@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   1920x1080@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   320x240@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   640x480@[30.000030 30.000030]fps
    
[avfoundation @ 0x7fe7f3810600]   800x600@[20.000000 20.000000]fps
    
[avfoundation @ 0x7fe7f3810600]   1024x768@[6.000002 6.000002]fps
    
0: Input/output error

    After that, I tried stream this webcam from my Mac using ffmpeg -f avfoundation -framerate 30 -i "0" -f mpeg1video -b 200k -r 30 -vf scale=1920:1080 http://127.0.0.1:8082/

    Output :

    [avfoundation @ 0x7f8515012800] An error occurred: The activeVideoMinFrameDuration passed is not supported by the device.  Use -activeFormat.videoSupportedFrameRateRanges to discover valid ranges.0: Input/output error

    I cannot capture or stream this webcam. However when I used the Facetime camera instead of this webcam, everything was OK. I’ve been searching for this problem for a few days, but still cannot fix it. Does anyone have experience with webcam and FFmpeg on Mac ?

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