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Dante4

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Posts posted by Dante4

  1. 23 hours ago, NicoD said:

    I`ve compiled rockchip mpp, but still get this message while compiling ffmpeg. I`ll try again tomorrow with another image and a clear head. Thanks a lot.

    "ERROR: rockchip_mpp not found using pkg-config"
     

     

    I did not had this message (but LongChair's mpv seems to not working with 10bits? on rk3399) so what i did:

    cd /home/dante4 && mkdir video && cd video && git clone -b master https://github.com/rockchip-linux/libmali && git clone https://github.com/rockchip-linux/mpp && git clone -b master https://github.com/rockchip-linux/gstreamer-rockchip  && git clone https://github.com/rockchip-linux/gstreamer-rockchip-extra && git clone https://github.com/mpv-player/mpv-build
    
    cd libmali && cmake CMakeLists.txt && make -j4 && make install && ldconfig
    LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
    LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/include
    cd ../mpp && cmake -DRKPLATFORM=ON -DHAVE_DRM=ON && make -j6 && make install
    
    apt-get update && apt-get upgrade -y && apt-get install -y libqt5opengl5 libqt5qml5 libqt5quick5 libqt5widgets5 libqt5gui5 libqt5core5a qml-module-qtquick2 libqt5multimedia5 libqt5multimedia5-plugins libqt5multimediaquick-p5 qtmultimedia5-examples qtmultimedia5-doc-html pkg-config gcc make git unzip wget xz-utils cmake devscripts equivs build-essential docutils-common mercurial cmake-curses-gui build-essential yasm mercurial cmake cmake-curses-gui build-essential gcc-arm-linux-gnueabi g++-arm-linux-gnueabi texinfo nasm automake pkg-config
    apt-get install libass-dev
    apt-get install libfdk-aac-dev fdkaac aac-enc libfdk-aac1
    apt-get install autoconf automake build-essential cmake git-core libass-dev libfreetype6-dev libsdl2-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev pkg-config texinfo wget zlib1g-dev yasm libx264-dev libx265-dev libnuma-dev libvpx-dev libfdk-aac-dev libmp3lame-dev libopus-dev mc locate libghc-bzlib-dev 
    

    and then i configured FFmpeg with this options

    PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" +http://forum.loverpi.com/discussion/comment/1426/#Comment_1426

     

    with doing this first

    where $home/ffmpeg_build is place where folder FFmpeg laying

    On 8/11/2018 at 6:01 PM, martos said:

    cd ~/ffmpeg_sources && \
    git -C aom pull 2> /dev/null || git clone --depth 1 https://aomedia.googlesource.com/aom && \
    mkdir aom_build && \
    cd aom_build && \
    PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" ../aom && \
    PATH="$HOME/bin:$PATH" make -j4 && \
    make install

  2. 15 hours ago, JMCC said:

    I'm not sure about ayufan's mpv version. I can tell you that I am working on a script for Armbian that has RKMPP enabled mpv. The proper way to start mpv with hardware decoding is like this:

    
    LD_LIBRARY_PATH=/path/to/your/libmali-gbm mpv --hwdec=rkmpp --vo=gpu --gpu-api=opengl --gpu-context=drm "<filename.mkv>"

    It works with my mpv, not sure about ayufan's

    Seems like i build libmali in wrong way (are there any other way to build it?) and i need to add some options, just cmake && make && make install doesn't allow me to get gbm installed.  And looking at output of mpv and google 

    [autoconvert] can't find video conversion for drm_prime/unknown

    Maybe I'm missing some files or links (just coping libmali-utgard-450-r7p0-gbm.so and creating links with name: libMali.so libgbm.so libgbm.so.1 and libgbm.so.1.0.0 to specific patch and then LD_LIBRARY_PATH to this folder doesn't seems to work). Maybe i need mpv from LongChair repo and not official one

     

    Solution.

    Yes i need to use LongChair repo. Now i'm interested can this be solved with just patch

  3. P.S. If someone wanna fast way to have mpv+ffmpeg this works on Renegade too (You need to add ayufan ppa) and do steps from "For older releases (< 0.6.25)".

    P.S.S. Can someone explain, does this repo have some heavy modified mpv? ffmpeg for now with proper flags should be able to use HW even from official repo, libmali-rk-utgard-450-r7p0-gbm can be build from official repo too. But with just that i still get software decoding

     

  4. On 12/25/2018 at 11:45 PM, JMCC said:

    Can you share some details on the steps you followed, and which player you are using? It can be useful for a complete implementation into Armbian.

     

    Thanks, and Merry Christmas.

     

    Yes, i will be happy to.


    A very small guide how to use any gstreamer player with rk3328 (Thanks to @JMCC):

    1.  After installation switch to nightly builds (may be unnecessary).
    2. From now on or add sudo to each command or do 
      sudo su

       

    3.  Then 
      apt-get update && apt-get upgrade -y && apt-get install -y libqt5opengl5 libqt5qml5 libqt5quick5 libqt5widgets5 libqt5gui5 libqt5core5a qml-module-qtquick2 libqt5multimedia5 libqt5multimedia5-plugins libqt5multimediaquick-p5 qtmultimedia5-examples qtmultimedia5-doc-html pkg-config gcc make git unzip wget xz-utils cmake devscripts equivs build-essential docutils-common mercurial cmake-curses-gui build-essential yasm mercurial cmake cmake-curses-gui build-essential gcc-arm-linux-gnueabi g++-arm-linux-gnueabi texinfo nasm automake pkg-config
    4.  Then install necessary components for gstreamer 

      apt-get install gstreamer1.0-tools qtgstreamer-plugins-qt5 gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-plugins-good gstreamer1.0-plugins-base gstreamer1.0-plugins-base-apps glib-2.0 libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgtk2.0-dev libperl-dev

       

    5.  Now download libmali, mpp, gstreamer-rockchip and gstreamer-rockchip-extra from rockchip github

      mkdir build && cd build && git clone -b master https://github.com/rockchip-linux/libmali && git clone https://github.com/rockchip-linux/mpp && git clone -b master https://github.com/rockchip-linux/gstreamer-rockchip  && git clone https://github.com/rockchip-linux/gstreamer-rockchip-extra
    6. Now apply patch from libreelec github to drm_fourcc

      nano /usr/include/drm/drm_fourcc.h

      and insert this

      #define DRM_FORMAT_NV12_10      fourcc_code('N', 'A', '1', '2') /* 2x2 subsampled Cr:Cb plane */
      #define DRM_FORMAT_NV21_10      fourcc_code('N', 'A', '2', '1') /* 2x2 subsampled Cb:Cr plane */
      #define DRM_FORMAT_NV16_10      fourcc_code('N', 'A', '1', '6') /* 2x1 subsampled Cr:Cb plane */
      #define DRM_FORMAT_NV61_10      fourcc_code('N', 'A', '6', '1') /* 2x1 subsampled Cb:Cr plane */
      #define DRM_FORMAT_NV24_10      fourcc_code('N', 'A', '2', '4') /* non-subsampled Cr:Cb plane */
      #define DRM_FORMAT_NV42_10      fourcc_code('N', 'A', '4', '2') /* non-subsampled Cb:Cr plane */

      after line 138 which is

      #define DRM_FORMAT_NV42		fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */

      close and safe file

    7. (may be unnecessary) Since we already added all this type of DRM_FORMAT we could add them to gstreamer also. To do this, add to this files 

      gstreamer-rockchip/gst/rkximage/rkx_kmsutils.c
      gstreamer-rockchip-extra/gst/rkximage/rkx_kmsutils.c
      gstreamer-rockchip-extra/gst/kms/gstkmsutils.c

      after lines 65-66 (for gstreamer-rockchip) and 62-63 (for gstreamer-rockchip-extra) which are 

        /* FIXME should be renamed to P010_* */
        DEF_FMT (NV12_10, P010_10LE),

       this lines

        DEF_FMT (NV21_10, P010_10LE),
        DEF_FMT (NV21_10, P010_10LE),
        DEF_FMT (NV16_10, P010_10LE),
        DEF_FMT (NV61_10, P010_10LE),
        DEF_FMT (NV24_10, P010_10LE),
        DEF_FMT (NV42_10, P010_10LE),

       

    8. Now do (from directory "build")

      cd libmali && cmake CMakeLists.txt && make && make install && ldconfig && /
      LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib && LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/include && /
      cd ../mpp && cmake -DRKPLATFORM=ON -DHAVE_DRM=ON && make -j4 && make install && /
      cd ../gstreamer-rockchip && ./autogen.sh && make -j4 && make install && ldconfig && /
      cd ../gstreamer-rockchip-extra && ./autogen.sh && make clean && make -j4 && make install && ldconfig

       

    9. To check if everything is correct do 

      gst-inspect-1.0 --gst-plugin-path=/usr/local/lib/gstreamer-1.0 | grep mpp
      expected output
      rockchipmpp:  mppjpegdec: Rockchip's MPP JPEG image decoder
      rockchipmpp:  mppjpegenc: Rockchip Mpp JPEG Encoder
      rockchipmpp:  mpph264enc: Rockchip Mpp H264 Encoder
      rockchipmpp:  mppvideodec: Rockchip's MPP video decoder
      

      and

      gst-inspect-1.0 --gst-plugin-path=/usr/local/lib/gstreamer-1.0 rkximage

      expected output

      Plugin Details:
        Name                     rkximage
        Description              Rockchip X/DRM Video Sink
        Filename                 /usr/local/lib/gstreamer-1.0/libgstrkximage.so
        Version                  1.1.0
        License                  GPL
        Source module            gstreamer-rockchip-extra
        Binary package           GStreamer Plug-ins source release
        Origin URL               Unknown package origin
      
        rkximagesink: Video sink
      
        1 features:
        +-- 1 elements

       

    10. To start use gst-play-1.0 do this 

      gst-play-1.0 --gst-plugin-path=/usr/local/lib/gstreamer-1.0 --videosink=rkximagesink <path/to/videofile>

       

    11. To use QT5 example player you need to do this

      env GST_PLUGIN_PATH=/usr/local/lib/gstreamer-1.0 QT_GSTREAMER_WIDGET_VIDEOSINK=rkximagesink /usr/lib/aarch64-linux-gnu/qt5/examples/multimediawidgets/player/player

        

    I hope it helped!

    P.S. Merry Christmas and Happy New Year

  5. 3 hours ago, pbies said:

    @Dante4 unfortunately there are some countries which they are not shipping to. Poland is one of them.

     

    Well, to be precise to whole EU (UK is not part of EU for them now). For EU there are special distributors, but that such pain to deal with them (one require special account to be able to order and other cost just huge), so maybe it will be simplier (and cheapier) to use some trustworthy man-in-the-middle outside of EU. 

  6. 3 hours ago, JMCC said:

    You can copy-paste this code into a root console, and it will give you a Qt5 player using the RK GStreamer plugin:

    
    apt-get -y install qtgstreamer-plugins-qt5 gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-plugins-good gstreamer1.0-plugins-base libqt5opengl5 libqt5qml5 libqt5quick5 libqt5widgets5 libqt5gui5 libqt5core5a qml-module-qtquick2 libqt5multimedia5 libqt5multimedia5-plugins libqt5multimediaquick-p5 qtmultimedia5-examples qtmultimedia5-doc-html
    echo '#!/usr/bin/env xdg-open
    [Desktop Entry]
    Type=Application
    Name=Rockchip Gst Player
    GenericName=Media Player
    Comment=A gstreamer base player
    Exec=env QT_GSTREAMER_WIDGET_VIDEOSINK=rkximagesink /usr/lib/arm-linux-gnueabihf/qt5/examples/multimediawidgets/player/player --geometry 960x640+0+0
    Icon=/usr/share/icons/gnome/48x48/categories/applications-multimedia.png
    Terminal=false
    Categories=Qt;AudioVideo;Player;Video;
    MimeType=application/ogg;application/x-ogg;application/mxf;application/sdp;application/smil;application/x-smil;application/streamingmedia;application/x-streamingmedia;application/vnd.rn-realmedia;application/vnd.rn-realmedia-vbr;audio/aac;audio/x-aac;audio/vnd.dolby.heaac.1;audio/vnd.dolby.heaac.2;audio/aiff;audio/x-aiff;audio/m4a;audio/x-m4a;application/x-extension-m4a;audio/mp1;audio/x-mp1;audio/mp2;audio/x-mp2;audio/mp3;audio/x-mp3;audio/mpeg;audio/mpeg2;audio/mpeg3;audio/mpegurl;audio/x-mpegurl;audio/mpg;audio/x-mpg;audio/rn-mpeg;audio/musepack;audio/x-musepack;audio/ogg;audio/scpls;audio/x-scpls;audio/vnd.rn-realaudio;audio/wav;audio/x-pn-wav;audio/x-pn-windows-pcm;audio/x-realaudio;audio/x-pn-realaudio;audio/x-ms-wma;audio/x-pls;audio/x-wav;video/mpeg;video/x-mpeg2;video/x-mpeg3;video/mp4v-es;video/x-m4v;video/mp4;application/x-extension-mp4;video/divx;video/vnd.divx;video/msvideo;video/x-msvideo;video/ogg;video/quicktime;video/vnd.rn-realvideo;video/x-ms-afs;video/x-ms-asf;audio/x-ms-asf;application/vnd.ms-asf;video/x-ms-wmv;video/x-ms-wmx;video/x-ms-wvxvideo;video/x-avi;video/avi;video/x-flic;video/fli;video/x-flc;video/flv;video/x-flv;video/x-theora;video/x-theora+ogg;video/x-matroska;video/mkv;audio/x-matroska;application/x-matroska;video/webm;audio/webm;audio/vorbis;audio/x-vorbis;audio/x-vorbis+ogg;video/x-ogm;video/x-ogm+ogg;application/x-ogm;application/x-ogm-audio;application/x-ogm-video;application/x-shorten;audio/x-shorten;audio/x-ape;audio/x-wavpack;audio/x-tta;audio/AMR;audio/ac3;audio/eac3;audio/amr-wb;video/mp2t;audio/flac;audio/mp4;application/x-mpegurl;video/vnd.mpegurl;application/vnd.apple.mpegurl;audio/x-pn-au;video/3gp;video/3gpp;video/3gpp2;audio/3gpp;audio/3gpp2;video/dv;audio/dv;audio/opus;audio/vnd.dts;audio/vnd.dts.hd;audio/x-adpcm;application/x-cue;audio/m3u;
    ' > /usr/share/applications/demo-player.desktop

     

    Well, i've seen this (oh, yeah, in your guide), but i guess my ./player did not worked because i forgot this "env QT_GSTREAMER_WIDGET_VIDEOSINK=rkximagesink" before executing it. Thank you once again

     

    Update:

    There is a problem with this shortcut, player execute, window opened, but it still shows error "unknown" (in window name). So i guess i need to found env QT_GSTREAMER_WIDGET_VIDEOSINK=rkximagesink for rk3328 and Armbian

     

    Update 2:

    Yep, it solved the way as using gstreamer. Add path to rkximagesink (since it's installed to /usr/local/lib/gstreamer-1.0) solves my problem with qt5 player

  7. 3 hours ago, JMCC said:

    No, it is not obvious. I knew it because I had to deal with the LibreElec source tree when I was preparing the RK-enabled Kodi for the Tinker Board :). RK used to have their own version of libdrm, but for some reason they discontinued the project. ASUS TinkerOS still included the library as of version 2.0.5, not sure if it is present in last release.

    Just in case, maybe you know how to make gstreamer full-screen? As far as i understood i need actually gstreamer-player to do this, but 

    ./ayamero-player not really helpful with error text and if i hardcode path to file and videosink it just says "Segmentation fault" when i try to start it

    ./player from /usr/lib/aarch64-linux-gnu/qt5/examples/multimediawidgets/player/ refuse to decode any video saying that he don't see any decoder for video

    any advice there?

     

    P.S. 

    https://github.com/rockchip-linux/rk-rootfs-build/tree/f788d8eb06b1aab5d8c3207d901afb500f2e01ba/packages/arm64/libdrm

    it was there just 5 month ago, and now they deleted it and their gstreamer don't work properly...just why?

  8. 2 hours ago, JMCC said:

    Libreelec has some patches to libdrm for 10-bit formats: https://github.com/LibreELEC/LibreELEC.tv/tree/master/projects/Rockchip/patches/libdrm

    @JMCC THANK YOU SO MUCH. Now i can finally watch 1080p30fps10bits! Perfectly fine!... 

    So.. This is so "obviously" that you need to type this lines in libdrm and i'm just didn't knew it because i'm actually newbie and it's common knowledge? But why it's nowhere to be found by error link or actually somewhere in any clones of gstreamer-rockchip?

  9. I'm trying to build working player for this board via mpv or gstreamer. (spoiler - i failed). Here is total list of command (ubuntu commads.txt) i have tried to make this work.

     

    First i load all the library that ever may be needed (is that error?), then i has downloaded github master version of libmali+mpp+rockchip-gstreamer+rockchip-gstreamer-extra+ffmpeg+mpv+mpv-build. Then i did

    for libmali

    cd libmali && cmake CMakeLists.txt && make && make install && ldconfig

    for mpp

    cd mpp && cmake -DRKPLATFORM=ON -DHAVE_DRM=ON && make -j4 && make install && ldconfig

    for gstreamer there was a bit of change, since rkximage seems to be main idea behind all players commands i found around, so instead of 

    ./autogen.sh --disable-rkximage && make

    i did

    nano gst/rkximage/rkx_kmsutils.c

    and changed DEF_FMT(NV12_10, P010_10LE) to DEF_FMT(NV12, P010_10LE)

    Yes, i have only roughly idea that this line was for 10 bits (maybe?), but my knowledge limited to googling and i failed to google how to actually fix it, so i did that. At least it complied.  Then i did

    ./autogen.sh && make -j4 && make install && ldconfig

    and same thing for gstreamer-rockchip-extra  

    nano gst/rkximage/rkx_kmsutils.c
    and changed DEF_FMT(NV12_10, P010_10LE) to //DEF_FMT(NV12_10, P010_10LE)

    nano gst/kms/gstkmsutils.c
    DEF_FMT(NV12_10, P010_10LE) to //DEF_FMT(NV12_10, P010_10LE)

     

    This video

    Spoiler

    Format                      : AVC

    Bit rate                    : 40.8 Mb/s
    Width                       : 3 840 pixels
    Height                      : 2 160 pixels
    Display aspect ratio        : 16:9
    Frame rate mode             : Constant
    Frame rate                  : 29.970 (30000/1001) FPS
    Color space                 : YUV
    Chroma subsampling          : 4:2:0
    Bit depth                   : 8 bits

    goes fine

     

    This video

    Spoiler

    Format                      : VP9

    Width                       : 3 840 pixels
    Height                      : 2 160 pixels
    Display aspect ratio        : 16:9
    Frame rate mode             : Constant
    Frame rate                  : 60.000 FPS
    Color space                 : YUV

    slideshow.

     

    This video

    Spoiler

    Format                      : AVC

    Bit rate                    : 18.7 Mb/s
    Width                       : 1 920 pixels
    Height                      : 1 080 pixels
    Display aspect ratio        : 16:9
    Frame rate mode             : Constant
    Frame rate                  : 30.000 FPS
    Color space                 : YUV
    Chroma subsampling          : 4:2:0
    Bit depth                   : 10 bits

    results in 

    ** (gst-play-1.0:24108): CRITICAL **: 15:20:22.782: gst_dmabuf_memory_get_fd: assertion 'gst_is_dmabuf_memory (mem)' failed

     

    Using gstreamer-rockchip from here doesn't solve anything.

     

    mpv...Just building it with correct flags and libmali doesn't do any good and results and errors like

    Spoiler

    [vo/gpu] VT_GETMODE failed: Inappropriate ioctl for device
    [vo/gpu/opengl] Failed to set up VT switcher. Terminal switching will be unavailable.
    gbm: failed to open any driver (search paths /usr/lib/aarch64-linux-gnu/dri:${ORIGIN}/dri:/usr/lib/dri)
    gbm: Last dlopen error: /usr/lib/dri/rockchip_dri.so: cannot open shared object file: No such file or directory
    failed to load driver: rockchip

     

    This https://github.com/ayufan-rock64/linux-build/blob/master/recipes/video-playback.md allow me to start 4k60fps as..30 fps video, but it's still fails on 10 bits refusing to show anything with this

    Spoiler

    [vo/gpu] VT_GETMODE failed: Inappropriate ioctl for device
    [vo/gpu/opengl] Failed to set up VT switcher. Terminal switching will be unavailable.
    [vo/gpu/opengl] Could not choose EGLConfig!
    [vo/gpu/drmprime-drm] Failed to create framebuffer on layer 0.

     

    But maybe someone already walked this path and know how to make 10 bits video work on any kind of image of Linux with gstreamer or mpv? 8 bits can be player up to 4k60fps..but 10 bits? just black screen on any image except Libreelec from firefly site

  10. 5 minutes ago, NicoD said:

    It can be powered with 5V too. I`ve tried with my powerbank. It also has got a m.2 nvme port, faster ram, raspberry pi camera and display compatible CSI/DSI(M4 is propriotary), 2xUSB3 ports each have a controller(m4 4 ports over 2 controllers) + 2x usb2 on a seperate controller, ...
    So the desing is amazing. It uses everything the SoC has to the fullest.
    It depends on where you buy it how much it is.
    I now got both the M4 and RockPi4B. The M4 has a way better heatsink. But otherwise the RockPi4B out performs the M4 in everything while clocked the same. It`s even almost as fast @ 1.4Ghz/1.8Ghz vs the M4 @ 1.5Ghz/2Ghz.
    A better heatsink is available. I advice to buy that if you would buy one. Cheers.

    I mean by tech specification it's not, but yeah... I guess they just didn't mentioned it "just-in-case". When i was looking for a board i found this one, but seems like i looked through most of it. Gonna buy it then, thank you again (where i can find heat sink? Or should i buy the one that M4 uses?)

  11. 30 minutes ago, NicoD said:

    Hi. I often power my sbc`s with a power bank. I`ve got multiple powerbanks. The ones I use the most are RavPower 26800mAh. Works great with that.
    Yours seems to have a normal output over the Type-C port :
    USB Type-C port: 5V/3A

    It should work just fine with that. You`ll need a cable with 2x type C.
    There`s now a new SBC, RockPi4. Also RK3399, same form factor. But with smart charge and pd. http://rockpi.org/
    I`m now researching it. Great architecture. But it`s very new, so many bugs in software.

    These RK3399 boars may be the size of a raspberry pi, they need a big heatsink to be useful, so they are heavy, and not that compact.
    I use an Odroid C2 for laptop with 7" display and a ravpower powerbank. This is more compact/lighter. I`m thinking of how to use a RK3399 board for this, but haven`t got a solution yet.
    The heatsink is on the bottom, so it needs airflow...
     

     

    Thanks for your answer, now I am calmer. About Odroid-C2 - i tried it at some point, but i wasn't able to get hardware acceleration to work, but it was 3 month ago, before i learned a few things about how does it works and for some reason there was no Mono-develop for it in monodevelop repository.

    RockPi seems interesting, i will look at it. Thank you again.

    Ok, where is problem? As far as i read about RockPi it's good to go. Software being in develop, creators of this board is willing to support Armbian and creating software, it's PD ok and cost less than M4... Where is trick? (except that it can't be powered from normal 5V and actually require PD)

  12. I got question regarding PSU. I have this power bank (https://www.tronsmart.com/products/tronsmart-edge-20000mah-quick-charge-3-0-power-bank) and i need something portable enough to be able to get it instead of laptop with ability to decode 10bit x264 (anime) and some mono-develop, while being less, than 100$ and be ok with being powered from power bank. 

     

    RasPi can't do 10bit video at all, so I'm thinking about buying this, but as far as i read about this board if power bank is "smart" it will only give 0.9A to output by-default.

     

    My question is Does anyone have experience with this board being powered from power bank?

    As far as i understood my power bank is "smart"(?), so, is there method (in-middle devices maybe?) how to make it output 5V/3A that's in stated in tech. details?

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