收到芒果派之后我看了一下這塊板子的基本情況

拿到手以后嘗試著使用HDMI連接到自己的便攜顯示器上面，發現這塊板子是MINI HDMI，我的便攜顯示器也是MINI HDMI，然后就買了一條雙mini hdmi口的線，現在是能連接上了。

其實我是想裝一個FFmpeg到這塊板子上的，但是官方提供的鏡像似乎默認并不能直接用OpenMax跑，可是看datasheet上面介紹的還是挺全的。

2.4.1. Video Decoding
? Supports video decoding up to 4K@60fps
? Supports multi-formats:
- H.265 Main10@L5.1 up to 4K@60fps, or 6K@30fps
- VP9 Profile 2 up to 4K@60fps
- AVS2 JiZhun 10bit Profile up to 4K@60fps
- H.264 BP/MP/HP@L4.2 up to 4K@30fps
- H.263 BP up to 1080p@60fps
- MPEG-4 SP/ASP@L5 up to 1080p@60fps
- MPEG-2 MP/HL up to 1080p@60fps
- MPEG-1 MP/HL up to 1080p@60fps
- Xvid up to 1080p@60fps
- Sorenson Spark up to 1080p@60fps
- VP8 up to 1080p@60fps
- AVS/AVS+ JiZhun Profile up to 1080p@60fps
- WMV9/VC1 SP/MP/AP up to 1080p@60
- JPEG HFIF file format up to 45MPPS

2.4.2. Video Encoding
? H.264 BP/MP/HP
? H.264 supports I/P frame, and only supports single reference frame
? MJPEG/JPEG baseline
? Maximum 16-megapixel(4096 x 4096) resolution for H.264 encoding
? H.264 encoding capability: 4K@25fps
? JPEG snapshot performance of 1080p@60fps independently
? Supports the constant bit rate(CBR)/variable bit rate(VBR) bit rate control mode, ranging from 256kbit/s to
100Mbit/s
? Encoding of eight regions of interest(ROIs)

看芯片是H616，是Allwinner的，那么他的Codec如果想要支持的，應該是可以考慮用 https://linux-sunxi.org/Sunxi-Cedrus 來支持。

但是配置sunxi-cedrus還是比較費勁的，所以可以先試試編譯一個ffmpeg來感受一下。

只跑低分辨率的mpeg2的話問題不大，但是分辨率稍微高一些可能就不行了，其實主要還是得上H264的編碼器，并且還是要用硬件編碼器。

root@orangepizero2:/home/orangepi/build_ffmpeg# ./ffmpeg -hwaccels
ffmpeg version N-111376-g13ef5025e3 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 10 (Debian 10.2.1-6)
  configuration:
  libavutil      58. 14.100 / 58. 14.100
  libavcodec     60. 22.100 / 60. 22.100
  libavformat    60. 10.100 / 60. 10.100
  libavdevice    60.  2.101 / 60.  2.101
  libavfilter     9.  8.102 /  9.  8.102
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
Hardware acceleration methods:
vdpau

看上去硬件加速器只有vdpau可以支持。

root@orangepizero2:/home/orangepi/build_ffmpeg# ifconfig
enx00e04cb24f01: flags=4099  mtu 1500
        ether 00:e0:4c:b2:4f:01  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth0: flags=4099  mtu 1500
        ether 7e:5e:e0:76:44:18  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 33

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 18  bytes 1148 (1.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 18  bytes 1148 (1.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163  mtu 1500
        inet 192.168.3.18  netmask 255.255.255.0  broadcast 192.168.3.255
        inet6 fe80::3031:1b37:2020:7f16  prefixlen 64  scopeid 0x20
        ether 2c:d2:6b:44:0b:ee  txqueuelen 1000  (Ethernet)
        RX packets 151313  bytes 201176906 (191.8 MiB)
        RX errors 0  dropped 731  overruns 0  frame 0
        TX packets 89332  bytes 10280764 (9.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

開機第一件事肯定是希望能連上個網，然后用自己的高配電腦可以ssh登錄到這塊板子上，畢竟這塊板子上跑界面還是比較慢的。

目前這塊板子上的硬件視頻編解碼能力還有跑起來，allwinner的芯片好像硬件視頻編解碼器跑起來比較折騰，可能需要自己重新build一個鏡像。這個過程比較漫長，我繼續去build了。