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  • High time delay : using ffmpeg to open camera and ffplay to play

    28 février 2021, par hgwd

    I'm working on a project which using ffmpeg to open camera and ffplay to play, but ffplay always have a high time delay which really confused me.

    


    These are my commands :

    


    ffmpeg -f avfoundation -s 1280x720 -r 30 -i 0 -pix_fmt yuv420p -f h264 -vf scale=640:360 udp://127.0.0.1:4000
ffplay udp://127.0.0.1:4000


    


    My environment :

    


    OS: macOS Catalina 10.15.7
CPU: 2.3GHz two Intel Core i5
Memory: 8GB


    


    Is anyone can help me ? Thanks !

    


  • Camera video capture to file in Xamarin using OpenCV and FFmpeg

    9 novembre 2017, par Bz Burr

    I’m currently building an Android App in Xamarin. Part of the app has a camera page that will be used to capture Videos.
    I currently use OpenCV to overlay some text on the video (time / date and other interesting stuff). This correctly displays on the screen.

    What I need to be able to do is to allow to users capture video and to make sure this data remains on the video.
    I can’t figure out how to use FFMPeg to make this happen. Should I be using the mediaRecorder somehow as, I’m guessing, OpenCV’s ?

    public Mat OnCameraFrame(Mat p0)

    Is the first stop for the frame along any sort of video capture process.
    I don’t want to just capture the phone’s screen as there are various buttons, etc that don’t belong in a video and of course I do want to capture the audio with the video.

    Can someone point me in the right direction ?

  • FFMPEG : Capture and Stream from Android Mobile Camera

    18 avril 2023, par Software Development Consultan

    I am checking for how we can use ffmpeg command line in android like using WritingMinds ffmpeg compiled for Android or any other Git project.

    



    I am trying to set following command :

    



    -loglevel trace -f android_camera -camera_index 0 -video_size hd720 -framerate 30 -input_queue_size 2 -i discarded -map 0 -vcodec libx264 -y /sdcard/editor_input/out.mp4"

    



    But it gives Unrecognized option 'camera_index'.

    



    There are some project like "https://github.com/CrazyOrr/FFmpegRecorder" which has Recorder App to store MP4 file but they seems uses FFMPEG APIs and code for getting frames and all, I Just want to directly use ffmpeg as commandline like we use in Linux.

    



    Can someone please guide what is best way to capture from android camera and stream MPEGTS stream on UDP ?

    



    Thanks.

    


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