DATV: How to encode in h.265 with an external HDMI encoder

Pourquoi passer en H.265 ?

In the previous article, I had the opportunity to explain that the digital rate transmitted to the transmitter is dependent on the characteristics of the radio signal that will be transmitted: Mainly its spectral width (or the number of kilo symbols) and the correction factor (FEC). If this doesn’t tell you much, I invite you to (re)read this article to clarify these important notions in DATV.

H.265 encoding (or MPEG-4 HEVC for High Efficiency Video Coding) is a much more powerful video encoding and compression process than H.264. Thanks to its algorithm that increases the static areas in the image and “tightens” the compression mesh, the H.265 encoder is able to save up to 70-80% bandwidth for the same quality as H.264 encoding.

On the image above, we can see that there are globally less squares on the right image, encoded in H.265 than on the left image. It is this economy of uniform areas that increases the data rate useful for transmitting an image. On the other hand, if we consider that we want to use the entire available bit rate, we will then be able to improve image quality, by avoiding blurring during rapid image movement, or else be able to increase the definition of the video sent.

On the other hand, H.265 encoding is only available on some recent graphics cards. Some third-generation Nvidia cards integrate an NVENC H.265 encoder (NVIDIA’s encoder). Refer to the GPU manufacturer’s list to know if your GPU integrates this H.265 encoding technology. For those who don’t, there are boxes on the market that encode a video input to an Ethernet network “output”.

There are several models on the market. We will focus on a model that is widely available and whose price remains correct: ON-DMI-16D (1080P@50fps) or ON-DM1-16A (1080p@60fps). Here are the manufacturer’s specifications.

H.265/H.264 HDMI Video Encoder

Basic Information    Username:admin;  Password:12345; IP:
Model   ON-DMI-16D   or    ON-DMI-16A
Chipset   Hi3516D (1080p@50fps) or Hi3516A (1080p@60fps)
Video Encoding   H.265/H.264 Encoding
Audio   AAC, G.711U, G.711A;  Sample: 48000kHz;G.711U/A for NVR
Audio sampling   32K, 48K, 64K, 128K or 8000HZ(for NVR)
Bitrate   CBR/VBR; 64kbps-12Mbps(adjustable)
Frame rate   1-30fps (adjustable)
Bitrate   Main Stream:1920*1080, 1600*900, 1440*1050, 1280*1024, 1280*800, 1280*720;
Sub Stream:1280*720;800*600, 720*576, 640*480, 640*352, 352*288, 320*240
Video Stream UDP   udp://@
TS stream stream) stream)
RTSP   rtsp:// stream)
rtsp:// stream)
Protocols   TCP/IP, UDP, RTSP, ONVIF, HTTP, DNS, RTMP, TS stream, DHCP
WI-FI Protocols   Support 802.11b/g/n, WEP, WPA, WPA2 Encrypted Protocol
Private Protocols   Hikvision and DaHua Private Protocols
Interfaces Network Port   RJ45 10M / 100M Adaptive Ethernet Interface
Reset   Support
Others Operating Environment   Temperature: -10℃~+55℃; Humidity: <95%
Server   Support Baidu Cloud, Youtube, Wowza and other streaming media servers
NVR Compatibility   Support H.265 NVR from Hikvision and DaHua【Audio:G.711U】
CMS Client   Support Hikvision (iVMS-4200/8700) and DaHua (SmartPSS)
Power Supply   DC 12V/1A
Consumption   ≤3W
Dimension   115(L) * 70(W) * 33(H)mm

Here is the encoder manual to download: H.265 HDMI Video Encoder Quick Start Guide_ERV1.2.pdf

12 thoughts on “DATV: How to encode in h.265 with an external HDMI encoder

  1. Merci pour ce guide.
    Concernant la mise à jour des fichiers système par la clé USB, il faut un hub dit “OTG”, dans mon cas j’utilise un HAMA Hub USB 2 OTG (ou un hub standard + un câble OTG). Il semble également que le disque USB se monte pas automatiquement forcément sous /media/sda… Sur mon Pluto, il apparaît sous /media/sda1.
    Voir nos discussions à ce sujet ici : https://forum.batc.org.uk/viewtopic.php?f=15&t=6626
    73 qro de michel, hb9dug

    Thank you for this guide.
    Concerning the update of the system files by the USB key, you need a hub called “OTG”, in my case I use a HAMA Hub USB 2 OTG (or a standard hub + an OTG cable). It also seems that the USB disk doesn’t automatically mount itself under /media/sda… On my Pluto, it appears under /media/sda1.
    See our discussions on this subject here: https://forum.batc.org.uk/viewtopic.php?f=15&t=6626
    73 qro de michel, hb9dug

    1. Merci Michel pour votre contribution intéressante,
      73 Christian

      Thank you Michel for your interesting contribution,
      73 Christian

  2. Greetings from New Zealand.

    I notice that you have done some work with this inexpensive h264 encoder.
    I have been trying to find out if it can encode 1080i50 as well as 1080p50
    Would this be something you could test? It seems to be very difficult to find.

    Best Regards,

    Salutations de la Nouvelle-Zélande.

    Je remarque que vous avez fait un peu de travail avec ce codeur h264 peu coûteux.
    J’ai essayé de savoir s’il pouvait encoder aussi bien le 1080i50 que le 1080p50
    Serait-ce quelque chose que vous pourriez tester ? Il semble très difficile à trouver.

    Bonne chance,

    1. Stuart,
      Here is a capture where we see that the output is indicated 1080p. Concerning the input I have no way to test the variant. I use a notebook, and I have no other source available. Sorry for the poor help.
      H264 H265 ecnoder 1080p
      Voici une capture où l’on voit que la sortie est indiquée 1080p. Concernant l’entrée je n’ai pas moyen de tester la variante. J’utilise un notebook, et je n’ai pas d’autre source disponible. Désolé pour le peu d’aide.

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  4. Hi all,
    have got recently an encoder box ON-DMI-16E and there is on the video setup screen the option audio on / off and it works …
    73 de Walter

    Bonjour à tous,
    J’ai récemment installé un encodeur ON-DMI-16E et il y a sur l’écran de configuration vidéo l’option audio on / off et ça marche …
    73 de Walter

    1. Walter,
      Yes it works since then thanks to the corrections made on the latest PlutoDVB alpha version firmware : https://www.f5uii.net/en/patch-plutodvb/
      But it didn’t work with the brave versions mentioned in the article.
      This would be a new article on my blog, especially with the new features brought by these recent alpha versions.
      Good tests. 73

      Oui cela fonctionne depuis avec les corrections apportés sur les derniers firmware PlutoDVB version alpha : https://www.f5uii.net/en/patch-plutodvb/
      Mais cela ne fonctionnait pas avec les versions brave cité dans l’article.
      Cela mériterait un nouvel article sur mon blog, notamment avec les nouvelles fonctions apportés par ces récentes versions alpha.
      Bons tests. 73

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  6. Hi Christian,
    Thankyou for the EXCELLENT! Perseverance firmware now using 0303
    Is there a simple explanation on how to update the encoder with “patch.tgz 2021-02-14 16:42 4.1M”
    Or is this not necessary when using Perseverance firmware?
    So many new features like to try them all with my limited Knowledge.

    1. Martin,

      from a console this should be done by running /root/h265box/autotelnet.sh But I don’t know exactly on which version of the encoder this can be implemented…
      Question may to be post on PlutoDVB group for a more detailed informations.

      1. Hi Christian,
        Followed your advice and now have the patch installed.
        Just trying to understand using the encoder with patch.
        Thanks again for your help.

  7. Hi, I have on-dmi-16e encoder. Last night when I try to update my device( software ) just die( i think there was a problem whit my router and the update just stop) I looking for the diagram of the device or the data sheet of the EEPROM ( can’t find it anywhere). Regards Pawel

    Bonjour, j’ai un encodeur on-dmi-16e. La nuit dernière, lorsque j’ai essayé de mettre à jour mon appareil (logiciel), il s’est éteint (je pense qu’il y a eu un problème avec mon routeur et que la mise à jour s’est arrêtée). Je cherche le diagramme de l’appareil ou la fiche technique de l’EEPROM (je ne la trouve nulle part). Cordialement Pawel

    1. I can’t help you. I have never come across these resources

      Je ne saurai pas vous aider. Je n’ai jamais croisé ces ressources

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