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    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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  • How to merge two AVFrame in ffmpeg

    28 septembre 2017, par Zeqi Lai

    Recently I am working on a ffmpeg-based project.

    What I want to do is to merge two videos (say video1 and video2) in real-time and display.

    And I tried to do the following steps in a loop :

    (1) decode a frame (f1) from video1 ;

    (2) decode a frame (f2) from video2 ;

    (3) merge f1 and f2, and generate f3. e.g. f1 is the upper half of f3, while f2 is the lower half of f3 ;

    (4) display f3.

    But my problem is : f1 and f2 are in AVFrame format. How can I use two AVFrames (f1 and f2) to generate f3 which is also an AVFrame ?

    Thanks !

  • FFPMEG : stream local file to UDP address, make client aware about video length and current frame time offset (make stream seekable ?)

    10 décembre 2014, par klim

    Just started to use FFMPEG. This is a really great library which is capable of video life transcoding and streaming.

    I use following commands to transcode and stream local video file to UDP address :
    ffmpeg -y -re -i inputvideo.mpeg2 -vsync 1 -vcodec mpeg4 -b 1600k -r 15 -crf 20 -acodec aac -ar 44100 -strict -2 -f mpegts udp ://192.168.1.30:1234

    It works smooth. I can open this udp address in VLC player and play life stream.

    Does anybody know how to make client aware about video duration and current time stamp ?

    Ideally would be nice to make stream seekable, as far as I understand it is not possible, but at least I would like to tell VLC client the total duration of the video and current frame time stamp, so it could show the progress.

    Thanks.

  • converting a 3d video from side/side to top/bottom

    17 juin 2020, par Ginso

    i have a 3d video where the images are side by side. The problem is, when my projector shows them alternately on full size, the subtitle(which is of course overlayed over the splitimage by the player) get's cut in half and distorted. Since i can't find a way to position the subtitle on one(or both) side, i would like to try to change the video to a top/down format.
Since most of the converter i found aren't free, i was wondering if this could be achieved by ffmpeg.
The resolution of the video is 1920x816. So, i need to cut out the left and the right half(960x816), convert them to 1920x408 and position the left on the top of the right to get 1920x816 again.
I would be ok, with doing this in multiple steps if i can't use a single command

    


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