**This is an old revision of the document!**
Ephiphan Broadcaster operation
Operational notes
Some projector setups require a custom resolution on the Broadcaster configuration to work properly.
Typical howto:
- Generate a EDID file by connecting the mixer laptop (or another linux box) to the projector and run make-edid.pl.
- cat/copy output to file on a machine with an web browser (currently not the mixer laptops, due to florolf
- goto framegrabber setings
- upload edid file via upload form
- After replacing the EDID file, the Broadcaster does not need to be restarted. Dis- and reconnecting the cable from the computer's display port is sufficient.
- If you see “Cannot update EDID. Please verify integrity and authenticity of the EDID file. E1011-3”, this is usually resolved by dis- and reconnecting the cable leading towards the projector.
How to get a EDID file:
- Preferred way: Script by Florolf that will create EDID files for the projector/display connected at a given machine: https://github.com/voc/scripts/blob/master/vgabroadcaster/make-edid.pl
If you want to force a special resolution, or subset of resolutions (e.g. prefer 16:9, no 16:10 only fallback 4:3)
- http://www.epiphan.com/support/vgadvi-broadcaster-drivers-documentation/ → Downloads → EDID
how to allow multiple resolutions at once? Concatenate EDID Files?- Rumor has it https://ez.analog.com/docs/DOC-2143 will make it work. Otherwise, request the required data from Ephipan support via the support chat on their website customedid_16-9.edid
- mithro of timvideos pointed us towards http://edid.tv/ und https://github.com/timvideos/edid.tv/tree/master/edid_parser.
Use of Broadcasters with DVSwitch
Usually we use the MJPEG streaming function of the Broadcaster (why?), which can be accessed through http://10.73.x.2:1881/vgabroadcaster.mjpg on older generation models, and through http://10.73.x.2:1881/stream.mjpg on new gen models (called VGADVI Broadcaster).
Assuming a 16:9 projector, use the following line to feed the mjpeg stream to DVSwitch:
ffmpeg -i http://10.73.x.2:1881/vgabroadcaster.mjpg \ -target pal-dv -loglevel error -aspect 16:9 - | \ dvsource-file-voc -h "10.73.x.1" -i 1 -p 2000 /dev/stdin
This fetches the image off the framegraber and distorts it to fill the video image. If the projector requires a 4:3 resolution, uou first need to upload an EDID file to the broadcaster (see respective section). Next, you need to add artifical bars on the left and on the right by replacing above line in /etc/services/grabbersource by this (or by modfiying it accordingly):
ffmpeg -i http://10.73.x.2:1881/vgabroadcaster.mjpg \ -filter:v 'scale=768:576, pad=1024:576:128:0 , scale=720:576' \ -target pal-dv -loglevel error -aspect 16:9 - | \ dvsource-file-voc -h "10.73.x.1" -i 1 -p 2000 /dev/stdin
A final problem that you might be facing is a presenter with 16:9 slides. The computer of the speaker will add black rows on top and bottom to accomodate for the 4:3 aspect. In total, this will now have borders on all four sides and make the slides appear much smaller than necessary.
The recommendd workaround is to add a second source that cuts off the black bars received from the laptop. Run the following line inside a screen session on one of the encoders:
ffmpeg -i http://10.73.x.2:1881/vgabroadcaster.mjpg \ -filter:v 'crop=h=3/4*in_h, scale=720:576' \ -target pal-dv -loglevel error -aspect 16:9 - | \ dvsource-file-voc -h "10.73.x.1" -i 5 -p 2000 /dev/stdin
Settings
MJPEG with “Default” setting (not “High speed”) 25 fps no audio no recording
Misc
The broadcasters are available via 192.168.255.250, no matter which IP is configured on the web interface. To reach it, set up your computer with IP address 192.168.255.249 using 255.255.255.252 as netmask.
The integrated 4 GB USB stick fits 3-4 hours of video at 1280×720 (H264, incl. Audio). The broadcaster can be configured such that it doesn't record anything if there is no input signal (VGA/DVI).
It can take up to 10 minutes for the broadcaster to come up.
If you wish to replace the USB stick with a larger model, please make sure to ext-3-format the stick and move the files from the old stick. Do not use dd.
hax0r
broadcaster lite partition layout
Disk /dev/sdc: 1967 MB, 1967128576 bytes 61 heads, 62 sectors/track, 1015 cylinders, total 3842048 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdc1 * 1 1051395 525697+ b W95 FAT32 /dev/sdc2 * 1051396 3838729 1393667 83 Linux