153 lines
8.3 KiB
Markdown
153 lines
8.3 KiB
Markdown
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Prerequisities
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--------------
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Install the collection of command line video4linux utilities
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> `sudo apt-get install v4l-utils`
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Lists all available cameras
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> `v4l2-ctl --list-devices`
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```
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USB Video device: USB Camera (usb-0000:01:00.0-1.1.4):
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/dev/video0
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/dev/video1
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```
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List available formats for your camera `/dev/video0` (e.g. [Logitech QuickCam Pro 9000](https://download01.logitech.com/support/25174.1.0.pdf))
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> `v4l2-ctl -d /dev/video0 --list-formats-ext`
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```
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ioctl: VIDIOC_ENUM_FMT
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Type: Video Capture
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[0]: 'MJPG' (Motion-JPEG, compressed)
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Size: Discrete 640x480
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Interval: Discrete 0.033s (30.000 fps)
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Interval: Discrete 0.040s (25.000 fps)
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Interval: Discrete 0.050s (20.000 fps)
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Interval: Discrete 0.067s (15.000 fps)
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Interval: Discrete 0.100s (10.000 fps)
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Interval: Discrete 0.200s (5.000 fps)
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Size: Discrete 800x600
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Interval: Discrete 0.033s (30.000 fps)
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Interval: Discrete 0.040s (25.000 fps)
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Interval: Discrete 0.050s (20.000 fps)
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Interval: Discrete 0.067s (15.000 fps)
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Interval: Discrete 0.100s (10.000 fps)
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Interval: Discrete 0.200s (5.000 fps)
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Size: Discrete 960x720
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Interval: Discrete 0.067s (15.000 fps)
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Interval: Discrete 0.100s (10.000 fps)
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Interval: Discrete 0.200s (5.000 fps)
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[1]: 'YUYV' (YUYV 4:2:2)
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Size: Discrete 640x480
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Interval: Discrete 0.033s (30.000 fps)
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Interval: Discrete 0.040s (25.000 fps)
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Interval: Discrete 0.050s (20.000 fps)
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Interval: Discrete 0.067s (15.000 fps)
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Interval: Discrete 0.100s (10.000 fps)
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Interval: Discrete 0.200s (5.000 fps)
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Size: Discrete 800x600
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Interval: Discrete 0.040s (25.000 fps)
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Interval: Discrete 0.050s (20.000 fps)
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Interval: Discrete 0.067s (15.000 fps)
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Interval: Discrete 0.100s (10.000 fps)
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Interval: Discrete 0.200s (5.000 fps)
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Size: Discrete 960x720
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Interval: Discrete 0.100s (10.000 fps)
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Interval: Discrete 0.200s (5.000 fps)
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Size: Discrete 1600x1200
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Interval: Discrete 0.200s (5.000 fps)
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```
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Or using ffmpeg
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> `ffmpeg -hide_banner -f v4l2 -list_formats all -i /dev/video0`
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```
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Compressed: mjpeg : Motion-JPEG : 160x120 176x144 320x240 352x288 640x480 800x600 960x720
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Raw : yuyv422 : YUYV 4:2:2 : 160x120 176x144 320x240 352x288 640x480 800x600 960x720 1600x1200
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```
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Lists all available audio recording devices
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> `arecord -l`
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```
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**** List of CAPTURE Hardware Devices ****
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card 1: Q9000 [QuickCam Pro 9000], device 0: USB Audio [USB Audio]
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Subdevices: 1/1
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Subdevice #0: subdevice #0
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```
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Live Streaming
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--------------
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Use you own `LIVE-STREAM-KEY` and run
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### Live stream camera to peertube
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> `ffmpeg -hide_banner -f v4l2 -framerate 15 -video_size 1600x1200 -input_format yuyv422 -i /dev/video0 -vcodec libx264 -tune zerolatency -b:v 1M -maxrate 1M -bufsize 2M -f flv rtmp://peertube.virtonline.eu:1935/live/LIVE-STREAM-KEY`
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### Live stream desktop to peertube
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Note: Does not work on Waylad ([What is Wayland in Linux Distros and Should You Use it?](https://www.ubuntupit.com/what-is-wayland-in-linux-distros-and-should-you-use-it/)). You can quickly check whether you're using X or Wayland `echo $XDG_SESSION_TYPE`
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> `DISPLAY=:0 ffmpeg -hide_banner -f x11grab -framerate 5 -video_size 830x630 -i :0.0+50,95 -vf format=pix_fmts=yuv420p -vcodec libx264 -tune zerolatency -preset veryfast -f flv rtmp://peertube.virtonline.eu:1935/live/LIVE-STREAM-KEY`
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### Live stream camera with sound and desktop as an overlay to peertube
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> `DISPLAY=:0` # select display (only if run remotely e.g. ssh)
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`ffmpeg -hide_banner` # do not output compile flags
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`-thread_queue_size 4096 -f pulse -ac 2 -i default` # audio input from PulseAudio
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`-thread_queue_size 512 -f v4l2 -framerate 5 -video_size 1600x1200 -input_format yuyv422 -i /dev/video0` # camera input
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`-thread_queue_size 512 -f x11grab -framerate 5 -video_size 830x630 -i :0.0+50,95` # 830x630 window from screen 0 with offset 50,95
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`-filter_complex 'overlay=main_w-overlay_w:main_h-overlay_h'` # picture-in-picture
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`-c:v libx264 -tune zerolatency -preset ultrafast -b:v 1M -maxrate 1M -bufsize 2M` # output video codec
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`-c:a aac -b:a 64k` # output audio codec
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`-f flv` # output container
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`rtmp://peertube.virtonline.eu:1935/live/LIVE-STREAM-KEY` # peertube streaming url
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### Live stream white text on black background [ffmpeg create blank screen with text video](https://stackoverflow.com/questions/22710099/ffmpeg-create-blank-screen-with-text-video)
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> `ffmpeg -hide_banner -f lavfi -i color=size=320x240:rate=25:color=black -vf "drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSans.ttf:fontsize=30:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:text='Stream začne čoskoro...'" -vcodec libx264 -preset slow -f flv rtmp://peertube.virtonline.eu:1935/live/LIVE-STREAM-KEY`
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### Live stream camera using h.264 hardware acceleration [VAAPI](https://trac.ffmpeg.org/wiki/Hardware/VAAPI) (e.g. on Intel iGPU)
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Use the dockerized ffmpeg with precompiled vaapi support, adjust `/dev/video2`
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> `alias ffmpeg='docker run --rm -w $(pwd) -v $(pwd):$(pwd) --device=/dev/dri --device=/dev/video2 jrottenberg/ffmpeg:vaapi'`
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Adjust `/dev/video2`, `-video_size 1920x1080 -framerate 60` and stream to peertube (if it can handle that much)
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> `ffmpeg -hide_banner -y -f v4l2 -input_format mjpeg -video_size 1920x1080 -framerate 60 -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i /dev/video2 -vf 'scale_vaapi=format=nv12' -c:v h264_vaapi -b:v 10M -f flv rtmp://peertube.virtonline.eu:1935/live/LIVE-STREAM-KEY`
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### Transcode and scale video file (and copy audio) using VAAPI (see [HWAccelIntro](https://trac.ffmpeg.org/wiki/HWAccelIntro))
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> `alias ffmpeg='docker run --rm -w $(pwd) -v $(pwd):$(pwd) --device=/dev/dri jrottenberg/ffmpeg:vaapi'`
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> `ffmpeg -y -hide_banner -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i 'https://github.com/bower-media-samples/big-buck-bunny-1080p-60fps-30s/raw/master/video.mp4' -c:v h264_vaapi -vf 'fps=60,scale_vaapi=w=1280:h=-2:format=nv12' -c:a copy -f mp4 big-buck-bunny-720p-60fps-30s-h264_vaapi.mp4`
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See iGPU load while transcoding
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> `sudo apt install intel-gpu-tools`
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> `sudo intel_gpu_top`
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```
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intel-gpu-top: Intel Skylake (Gen9) @ /dev/dri/card0 - 0/ 0 MHz; 100% RC6; 0.00/ 2.40 W; 0 irqs/s
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IMC reads: 166 MiB/s
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IMC writes: 30 MiB/s
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ENGINES BUSY MI_SEMA MI_WAIT
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Render/3D 0.00% | | 0% 0%
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Blitter 0.00% | | 0% 0%
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Video 0.00% | | 0% 0%
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VideoEnhance 0.00% | | 0% 0%
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```
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Adjusting camera functions
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--------------------------
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Brightness, zoom, focus, etc, can be adjusted
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> `v4l2-ctl -L`
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```
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brightness 0x00980900 (int) : min=-64 max=64 step=1 default=0 value=0
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contrast 0x00980901 (int) : min=0 max=95 step=1 default=0 value=0
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saturation 0x00980902 (int) : min=0 max=100 step=1 default=64 value=64
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hue 0x00980903 (int) : min=-2000 max=2000 step=1 default=0 value=0
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white_balance_temperature_auto 0x0098090c (bool) : default=1 value=1
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gamma 0x00980910 (int) : min=100 max=300 step=1 default=100 value=100
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power_line_frequency 0x00980918 (menu) : min=0 max=2 default=1 value=1
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0: Disabled
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1: 50 Hz
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2: 60 Hz
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white_balance_temperature 0x0098091a (int) : min=2800 max=6500 step=10 default=4600 value=4600 flags=inactive
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sharpness 0x0098091b (int) : min=1 max=7 step=1 default=2 value=2
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backlight_compensation 0x0098091c (int) : min=0 max=1 step=1 default=0 value=0
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exposure_auto 0x009a0901 (menu) : min=0 max=3 default=3 value=3
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1: Manual Mode
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3: Aperture Priority Mode
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exposure_auto_priority 0x009a0903 (bool) : default=0 value=1
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```
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Then adjust the value:
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> `v4l2-ctl -c <option>=<value>` |