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  • STICKY: All about accelerated video on the Raspberry Pi [thanks all . . .
    Chrome can use MMAL for video playback but it needs to be enabled GL with Full KMS ("dtoverlay=vc4-kms-v3d" in config txt) This is the recommended setting and the default for Bullseye In this mode, DRM and KMS directly manage the GPU without relying on proprietary VideoCore VPU firmware V4L2 still wraps MMAL as above
  • MMAL vs. libcamera - Raspberry Pi Forums
    I had hoped that Pi and BroadCom could find away to make MMAL available; I guess Pi Trading needs BroadCom more than BroadCom needs Pi My project makes extensive use of MMAL (Connection tunnelling and use MMAL of many components (2 vc ril camera, vc ril hvs, vc splitter, vc ril video_render and 2 vc ril video_encode)
  • MMAL vs V4L2 - Raspberry Pi Forums
    MMAL and V4L2 are two APIs for multimedia MMAL is Broadcom specific, but exposes all the features of the hardware V4L2 is defined by a group of Linux kernel developers, is common to almost all Linux devices, but in being generic means that not all the features can be exposed
  • MMAL Motion - tuning optimisations - Raspberry Pi Forums
    MMAL JPEG Encoding To try to reduce the output encoding bottleneck, there is a further new option - mmalcam_secondary_buffer_jpeg If this is set to a value between 1 to 100, the MMAL API is used to encode the secondary buffer into JPEG format using the given value to indicate the quality (low to high)
  • Motion - MMAL camera - Raspberry Pi Forums
    If you're having a specific issue with Motion when using the MMAL camera module, please post details ideally attaching your conf file and the command line arguments you're using @fturiot - the code's not quite ready to deliver as a deb, there's a few changes still to make and I need to test a bit more (e g with latest Raspian updates and firmware)
  • Solved - VLC New Builds and Updates not Loading mmal Modules
    Code: Select all pi@raspberrypi:~ ryde $ vlc --list | grep mmal VLC media player 3 0 17 4 Vetinari (revision 3 0 13-8-g41878ff4f2) mmal_deinterlace MMAL-based deinterlace filter plugin mmal_vout mmal_vout mmal_vout MMAL-based vout plugin for Raspberry Pi mmal_converter MMAL OpenGL surface converter mmal_avcodec MMAL buffered avcodec mmal_xsplitter MMAL x11 splitter for Raspberry Pi mmal_codec
  • Experiment with Camera Module : MMAL, OpenCV, Overlay
    - We can use MMAL api to capture video to memory buffer, convert it to IplImage and process with OpenCV If you want to show live video on screen You can tunnelling Camera to Video Render directly and use OpenVG, dispmanx, EPL OpenGL to overlay information you need over screen
  • Recommended reading for MMAL - Raspberry Pi Forums
    OpenMAX is a Khronos standard, so there is lots of documentation, MMAL was developed as a sort of wrapper over OpenMAX components by Broadcom because OpenMAX is a horrible API to actually develop for and debug (especially over Android) MMAL is easier to get things up and running if you are familiar with it, but OpenMAX has document ion
  • Compiling FFMPEG with MMAL - Raspberry Pi Forums
    3) ffplay -vcodec h264_mmal test_h264_mmal mp4 ( with different resolution such as 320*240, 640*480 ) 4) Set the gpu_mem value to 128 and 256 Below is the configuration on ffmpeg:
  • MMAL single frame encoding - Raspberry Pi Forums
    MMAL does support fragmenting an encoded frame over multiple buffers when the frame size





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