Pushing streams to Decklink SDI
Flussonic Media Server not only captures streams but also passes them to a Decklink SDI or HDMI card.
Output to Decklink SDI or Decklink HDMI cards
To enable pushing set the parameter push decklink://
:
stream test {
input udp://239.0.0.1:1234;
push decklink://0 size=720x576 fps=50 deinterlace=true;
}
Flussonic decodes a stream and passes it to the specified Decklink device or a slot on the card itself (for example, 0). If necessary, you can use deinterlace=true
to eliminate interlacing.
To manage pushing to a Decklink card, you can set the following parameters:
Parameter | Description |
---|---|
dthreads |
Number of threads in a decoder. See API schema. |
scale |
Scaling algorithm. See API schema. |
volume |
Audio volume coefficient. See API schema. |
fps |
Frame rate. See API schema. |
size |
The size of output frame in pixels. |
format |
The Decklink mode supported by a card. For details, see Decklink card modes. |
vbi_lines |
Lines of VBI (vertical blanking interval) of an output analog stream that will contain teletext. For details, see Passing teletext from MPEG-TS to analog streams and API schema. |
disabled |
Disable pushing the stream. |
Decklink card modes
Usually a Decklink card supports a limited set of modes. Each mode is a combination of a frame size and FPS, encoded in Decklink format. For example, Hp50 is for 1920x1080 size with 50000/1000 FPS. When pushing a stream to a Decklink card, you can set the mode value in the format
parameter. For example:
stream test {
input ...;
push decklink://0 format=Hi50;
}
The possible Decklink card modes are listed below.
mode description
ntsc 720x486 at 30000/1001 fps (interlaced, lower field first)
pal 720x576 at 25000/1000 fps (interlaced, upper field first)
23ps 1920x1080 at 24000/1001 fps
24ps 1920x1080 at 24000/1000 fps
Hp25 1920x1080 at 25000/1000 fps
Hp29 1920x1080 at 30000/1001 fps
Hp30 1920x1080 at 30000/1000 fps
Hp50 1920x1080 at 50000/1000 fps
Hp59 1920x1080 at 60000/1001 fps
Hp60 1920x1080 at 60000/1000 fps
Hi50 1920x1080 at 25000/1000 fps (interlaced, upper field first)
Hi59 1920x1080 at 30000/1001 fps (interlaced, upper field first)
Hi60 1920x1080 at 30000/1000 fps (interlaced, upper field first)
hp50 1280x720 at 50000/1000 fps
hp59 1280x720 at 60000/1001 fps
hp60 1280x720 at 60000/1000 fps
4k23 3840x2160 at 24000/1001 fps
4k24 3840x2160 at 24000/1000 fps
4k25 3840x2160 at 25000/1000 fps
4k29 3840x2160 at 30000/1001 fps
4k30 3840x2160 at 30000/1000 fps
4k50 3840x2160 at 50000/1000 fps
4k59 3840x2160 at 60000/1001 fps
4k60 3840x2160 at 60000/1000 fps
4d23 4096x2160 at 24000/1001 fps
4d24 4096x2160 at 24000/1000 fps
4d25 4096x2160 at 25000/1000 fps
4d29 4096x2160 at 30000/1001 fps
4d30 4096x2160 at 30000/1000 fps
4d50 4096x2160 at 50000/1000 fps
4d59 4096x2160 at 60000/1001 fps
4d60 4096x2160 at 60000/1000 fps
DeckLink duplex mode
To specify the duplex mode that allows choosing between the input and output direction of your DeckLink SDI card, use the following global configuration:
decklink 0 {
profile two_half;
}
decklink 1 {
profile two_half;
}
The example above shows the configuration of a half-duplex mode for a DeckLink Duo 2 card.
Depending on the DeckLink card model, the following modes are supported:
one_full
— bmdProfileOneSubDeviceFullDuplexone_half
— bmdProfileOneSubDeviceHalfDuplextwo_full
— bmdProfileTwoSubDevicesFullDuplextwo_half
— bmdProfileTwoSubDevicesHalfDuplexfour_half
— bmdProfileFourSubDevicesHalfDuplex
The DeckLink Quad 2 and the DeckLink Duo 2 cards have a specific physical to logical port mapping (see Fig. 1), which affects the configuration of duplex modes.
Figure 1. Physical to logical port mapping for DeckLink Quad 2 and Duo 2.
Let's configure a DeckLink Quad 2 card so that all the ports are either used as input or output.
In this case, the two_half
mode should be used.
To set the two_half
mode for the DeckLink Quad 2 card, use the configuration below:
decklink 0 {
profile two_half;
}
decklink 1 {
profile two_half;
}
decklink 2 {
profile two_half;
}
decklink 3 {
profile two_half;
}