magewell pcie pro capture quad HDMI

Brian Crawley · 2020-03-21T17:37:16+00:00

Hello all, I use tvheadend (Ubuntu 18.04 server) with external HDMI encoders (TBS). The encoder send udp multicast to the tvheadend units (5) where it is p...

Saen Acro

Force colorspace there is a difference.

And start to usePRE button for formatting your posts.

Brian Crawley


got video working with 

pipe:////usr/bin/ffmpeg -i /dev/video0 -c:v libx264 -preset ultrafast -qp 0 -f mpegts pipe:1

will read about colorspace filter and how to adjust fps, resolution etc. as each hdmi input will be different I think. 

so ffprobe /dev/video shows the current output of the device while ffmpeg -list_formats all /dev/video0 shows what ffmpeg can read from the device.
would be nice to set output on the card to reduce load on the cpu/ffmpeg but its working. will continue to read the documentation.

will try live video feeds on all 4 HDMI ports from the shop tomorrow and report results

do I have to specify an audio codec or does libx264 do both ? there is no sound on the HDMI feed here

Thanks

Saen Acro


pipe:////usr/bin/ffmpeg -i /dev/video0 -c:v libx264 -preset ultrafast -qp 0 -f mpegts pipe:1

This PIPE not include audio

it need to be something as

pipe:///usr/bin/ffmpeg -i /dev/video0 -c:v libx264 -preset ultrafast -qp 0 -c:a libfdk_aac -b:a 128k -f mpegts pipe:1

https://trac.ffmpeg.org/wiki/Encode/AAC

Brian Crawley


k, will test as soon as its in the rack at the shop. Thanks

Brian Crawley


well I got the server in the rack and up, stripped the hdcp and the video is going nice. no audio though.


device path     firmware ver    hardware ver    driver ver      alsa name       device name      
/dev/video0     1.32            A               1.3.4068        hw:0,0          00:00 Pro Capture Quad HDMI

Input audio
  Audio format ........................... 48000 Hz, 16 bit, LPCM
  Channel 1 & 2 .......................... Valid

I tried to use alsa device hw:1,0 but there is no such device. i tried to reinstall the drivers no change. there is no audio card in this server. i did install alsa and tools and when i started the mixer it listed 00-00 pro capture card but no sound channels. i sent an email to magewell. 

pipe:////usr/bin/ffmpeg -f alsa -ac 2 -i hw:1,0 -i /dev/video1 -framerate 30 -s 1280:720 -c:v libx264 -preset veryfast -maxrate 4500k -bufsize 9000k -g 60 -c:a libfdk_aac -b:a 128k -f mpegts pipe:1

returns:
ALSA lib pcm_hw.c:1826:(_snd_pcm_hw_open) Invalid value for card
 spawn: [alsa @ 0x560d4a09d180] cannot open audio device hw:1,0 (No such file or directory)
 spawn: hw:1,0: Input/output error
  iptv: stdin pipe unexpectedly closed: No data

when i run arecord -l
null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=HDMI
    00-00 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
sysdefault:CARD=HDMI
    00-00 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
dmix:CARD=HDMI,DEV=0
    00-00 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample mixing device
dsnoop:CARD=HDMI,DEV=0
    00-00 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample snooping device
hw:CARD=HDMI,DEV=0
    00-00 Pro Capture Quad HDMI, Pro Capture PCM
    Direct hardware device without any conversions
plughw:CARD=HDMI,DEV=0
    00-00 Pro Capture Quad HDMI, Pro Capture PCM
    Hardware device with all software conversions
default:CARD=HDMI_1
    00-01 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
sysdefault:CARD=HDMI_1
    00-01 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
dmix:CARD=HDMI_1,DEV=0
    00-01 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample mixing device
dsnoop:CARD=HDMI_1,DEV=0
    00-01 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample snooping device
hw:CARD=HDMI_1,DEV=0
    00-01 Pro Capture Quad HDMI, Pro Capture PCM
    Direct hardware device without any conversions
plughw:CARD=HDMI_1,DEV=0
    00-01 Pro Capture Quad HDMI, Pro Capture PCM
    Hardware device with all software conversions
default:CARD=HDMI_2
    00-02 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
sysdefault:CARD=HDMI_2
    00-02 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
dmix:CARD=HDMI_2,DEV=0
    00-02 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample mixing device
dsnoop:CARD=HDMI_2,DEV=0
    00-02 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample snooping device
hw:CARD=HDMI_2,DEV=0
    00-02 Pro Capture Quad HDMI, Pro Capture PCM
    Direct hardware device without any conversions
plughw:CARD=HDMI_2,DEV=0
    00-02 Pro Capture Quad HDMI, Pro Capture PCM
    Hardware device with all software conversions
default:CARD=HDMI_3
    00-03 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
sysdefault:CARD=HDMI_3
    00-03 Pro Capture Quad HDMI, Pro Capture PCM
    Default Audio Device
dmix:CARD=HDMI_3,DEV=0
    00-03 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample mixing device
dsnoop:CARD=HDMI_3,DEV=0
    00-03 Pro Capture Quad HDMI, Pro Capture PCM
    Direct sample snooping device
hw:CARD=HDMI_3,DEV=0
    00-03 Pro Capture Quad HDMI, Pro Capture PCM
    Direct hardware device without any conversions
plughw:CARD=HDMI_3,DEV=0
    00-03 Pro Capture Quad HDMI, Pro Capture PCM
    Hardware device with all software conversions

I did try hw:HDMI_1,0 
still no device pipe closes

thanks for your help B

Saen Acro

+UsePRE to text you copy from terminal not to all text+

Do you can get working solution any other way under linux with this capture card?

Brian Crawley

in linux I can get the video


Input #0, video4linux2,v4l2, from '/dev/video1':
  Duration: N/A, start: 71939.629989, bitrate: 745823 kb/s
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, 745823 kb/s, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc

or I can get the audio

Input #0, alsa, from 'hw:1,0': Duration: N/A, start: 1586389697.839621, bitrate: 1536 kb/s Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s

in linux on the command line I can get both and the audio/video is in sync too

ffmpeg -f alsa -thread_queue_size 1024 -ac 2 -i hw:0,0 -f video4linux2 -thread_queue_size 1024 -i /dev/video0 -s 1920x1080 -c:v libx264 -x264opts bitrate=2000 -profile:v baseline -preset superfast test1.mp4

in tvheadend i can pipe the video no problem

pipe:////usr/bin/ffmpeg -f video4linux2 -thread_queue_size 1024 -i /dev/video0 -s 1920x1080 -c:v libx264 -x264opts bitrate=2000 -profile:v baseline -preset superfast -f mpegts pipe:1

what I can't do is figure out the syntax/format to pipe both the audio and video together in a watchable stream in tvheadend.

the error is unable to pipe hw:0,0 or hw:0 or hw:HDMI,0 but they all work from the command line.

2020-04-09 18:16:28.721 spawn: ALSA lib pcm_hw.c:1826:(_snd_pcm_hw_open) Invalid value for card 2020-04-09 18:16:28.721 spawn: [alsa @ 0x5581a1861100] cannot open audio device hw:0 (No such file or directory) 2020-04-09 18:16:28.721 spawn: hw:0: Input/output error 2020-04-09 18:16:28.725 iptv: stdin pipe unexpectedly closed: No data or 2020-04-09 18:30:54.261 spawn: ALSA lib conf.c:4898:(parse_args) Unknown parameter 1 2020-04-09 18:30:54.261 spawn: ALSA lib conf.c:5031:(snd_config_expand) Parse arguments error: No such file or directory 2020-04-09 18:30:54.261 spawn: ALSA lib pcm.c:2564:(snd_pcm_open_noupdate) Unknown PCM hw:HDMI,0 2020-04-09 18:30:54.261 spawn: [alsa @ 0x55f6b1325100] cannot open audio device default:HDMI,0 (No such file or directory) 2020-04-09 18:30:54.261 spawn: hw:HDMI,0: Input/output error 2020-04-09 18:30:54.265 iptv: stdin pipe unexpectedly closed: No data

arecord -l shows

default:CARD=HDMI 00-00 Pro Capture Quad HDMI, Pro Capture PCM Default Audio Device sysdefault:CARD=HDMI 00-00 Pro Capture Quad HDMI, Pro Capture PCM Default Audio Device dmix:CARD=HDMI,DEV=0 00-00 Pro Capture Quad HDMI, Pro Capture PCM Direct sample mixing device dsnoop:CARD=HDMI,DEV=0 00-00 Pro Capture Quad HDMI, Pro Capture PCM Direct sample snooping device hw:CARD=HDMI,DEV=0 00-00 Pro Capture Quad HDMI, Pro Capture PCM Direct hardware device without any conversions plughw:CARD=HDMI,DEV=0 00-00 Pro Capture Quad HDMI, Pro Capture PCM Hardware device with all software conversions

why would it work on the command line but not in tvheadend. is it a permission issue ?

thanks

Saen Acro

Congratulations for your first corectly formated post.


pipe:////usr/bin/ffmpeg -f video4linux2 -thread_queue_size 1024 -i /dev/video0 -s 1920x1080 -c:v libx264 -x264opts bitrate=2000 -profile:v baseline -preset superfast -f mpegts pipe:1

remove extra "/" after pipe://

pipe:///usr/bin/ffmpeg -f video4linux2 -thread_queue_size 1024 -i /dev/video0 -s 1920x1080 -c:v libx264 -x264opts bitrate=2000 -profile:v baseline -preset superfast -f mpegts pipe:1

Try to make bash script with terminal command and pipe to TVH.

read this
https://stackoverflow.com/questions/6311560/how-can-i-capture-audio-and-video-simultenaous-with-ffmpeg-from-a-linux-usb-capt

Brian Crawley

I'm gonna say typo on my part. should have been only 3 /

so i can write a script (4 total 1 each for the hdmi inputs) but I am not sure how to go about this.

I understand pipe to a file but do not want to fill the hard drive.

maybe something like

mkfifo hdmipipe1 pipe:///usr/bin/ffmpeg -f alsa -thread_queue_size 1024 -ac 2 -i hw:0 -f video4linux2 -thread_queue_size 1024 -i /dev/video0 -s 1920x1080 -c:v libx264 -x264opts bitrate=2000 -profile:v baseline -preset superfast -f mpegts hdmipipe1

then from tvheadend

pipe:///usr/bin/ffmpeg -i /dir/of/file/hdmipipe1 -vcodec copy -acodec copy -f mpegts pipe:1

will hdmipipe1 require .ts ?

I'll start reading the pipe manpage. Thanks

Saen Acro

No need to write anything to hard disk, there is some examples in this forum.

Brian Crawley

Thank you for all the help, including how to post :)
my final syntax was

ffmpeg -hide_banner -loglevel quiet -f alsa -thread_queue_size 1024 -ac 2 -i hw:0,0 -f video4linux2 -thread_queue_size 1024 -i /dev/video0 -s 1080x720 -c:v libx264 -x264opts bitrate=2000 -profile:v baseline -preset superfast -f mpegts /home/of/mkfifo/filename -y

I added the ffmpeg command to the systemd as a .service so it starts with the server and can be checked/restarted with sudo systemctl command
its called in tvheadend with

pipe:///usr/bin/ffmpeg -i /home/of/mkfifo/filename -vcodec copy -acodec copy -f mpegts pipe:1

should the audio be encoded ? the video gets c:v libx264 but dont think anything is done to the audio and it takes along time for the stream to sync and start up

might have to play with -bufsize -minrate and -maxrate but its working. Thanks

Saen Acro

"poor" command line ;)

add some more parameters
(modeficate to your needs)

this use Nvidia GPU to transcode sd channel

ffmpeg -re -vsync passthrough -copytb 1 \ -hwaccel cuvid -hwaccel_device 0 -probesize 10000000 -analyzeduration 10000000 \ -fflags discardcorrupt+genpts+nobuffer -c:v mpeg2_cuvid -gpu 0 -deint adaptive -drop_second_field 1 -recv_buffer_size 67108864 \ -i alsa -thread_queue_size 1024 -ac 2 -i hw:0,0 -f video4linux2 -thread_queue_size 1024 -i /dev/video0 -s 1080x720 \ -filter_complex [0:i:0x2b4]split=outputs=1[map:v:0] -map [map:v:0] \ -c:v:0 hevc_nvenc -g 150 \ -flags:v +global_header+cgop -preset:v medium \ -profile:v:0 main -gpu 0 -b:v:0 500k -maxrate:v:0 1200k \ -bufsize:v:0 2400k -map 0:i:0x2b5 -c:a:0 libfdk_aac -ac 2 -ar 44100 -b:a:0 96k \ -metadata service_name=HDMI-1 \ -metadata service_provider=Quad-Capture \ -max_muxing_queue_size 512 -f pipe:1 -nostdin -hide_banner -loglevel info

Brian Crawley

Sorry for the delay in responding I was on an outside project for a bit. I'm starting to understand just how many options there are. I am going through

ffmpeg -h full and there is alot. i am reading about -filter_complex and the -map option.

I do not understand [0:i:0x2b4] and then later -map 0:i:0x2b5 are you calling the video input from the graphics card ? -hwaccel_device 0

split(audio and video inputs)=outputs(from audio and video after applied filter)=1(combined stream) ?

I will not use hardware(gpu), just memory and cpu this is a dedicated server for this capture card. Thanks

Saen Acro

This select exact audio stream remove it you can set this in STB
Video card is lot more potential then cpu for compression
cheapest Intel "i" series gen 2 and gen 3 can compress 8-10 HD channels with QSV, without high cpu load.