Milk-V Duo Multimedia Examples

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This project provides examples of multimedia applications developed in C/C++ for the Linux environment, which can be run on the "Milk-V Duo Series" devices.

Development Environment

1. Use a local Ubuntu system, with Ubuntu 22.04 LTS recommended. (You can also use Ubuntu within a virtual machine, Windows Subsystem for Linux (WSL), or an Ubuntu system based on Docker.)

2. Install compilation dependencies:

   sudo apt-get install wget git cmake

3. Download the cross-compilation tools:

   git clone https://github.com/milkv-duo/host-tools.git

4. Obtain the Examples:

   git clone https://github.com/milkv-duo/duo-media-examples.git

5. Modify the cmake/musl_riscv64.cmake file to set CROSS_CHAIN_PATH:

   # Fixme replace with your appropriate path.
   set(CROSS_CHAIN_PATH  "XXX/host-tools/gcc/riscv64-linux-musl-x86_64")
   

6. Compile and test: As an example, for the video_recorder, navigate to the example directory and run ./build_riscv64.sh:

   cd video_recorder
   ./build_riscv64.sh

   After the compilation is successful, send the out/videoRecorder executable program to the Duo device through the network or USB-NCM. For example, in the case of USB-NCM which is supported by the default firmware, if the IP of Duo is 192.168.42.1, the username is root and the password is milkv.

   $ scp out/videoRecorder [email protected]:/root/

   Once transferred, run ./videoRecorder -h in your ssh or serial terminal to display help information:

    [root@milkv]~# ./videoRecorder -h
    usage: videoRecorder [-h] [-f flv] [-t 60] [-o out.flv]
    This is a simple video recording program based on milkV duo.
   
    --daemon                          Run application as a daemon.
    --umask=mask                      Set the daemon's umask (octal, e.g. 027).
    --pidfile=path                    Write the process ID of the application to 
                                      given file.
    -h, --help                        Display help information.
    -f<format>, --format=<format>     Specify output format: h264, flv.
    -t<seconds>, --time=<seconds>     Specify recording duration seconds.
    -o<outpath>, --outpath=<outpath>  Specify output path.
   
    For more information, visit the website https://milkv.io.

   To record a video from the camera for 60 seconds in flv format with the output filename as out.flv, use the following command:

   ./videoRecorder -f flv -t 60 -o out.flv

How to create your own project

• Copy an existing example and modify it according to your needs.

Example descriptions

1. video_recorder

   • Record a video from the camera.

2. video_player_vo

   • Uses CVITEK's Multimedia Framework for video decoding and playback.
   • Note: Before playing videos, configure MIPI_DSI

3. video_player_fb

   • Uses ffmpeg for video decoding and Linux framebuffer for playback.
   • Note: Before playing videos, load the fb kernel module:

   [root@milkv-duo]~# insmod /mnt/system/ko/cvi_fb.ko 

Questions

Source of 3rd_party

• cvi_mpi
• poco
• ffmpeg
• spdlog

About Milk-V

• Visit the official website for more information.

Technical Forum

• Join the MilkV Community for discussions and support.