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Add video4linux2 support

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This commit is contained in:
beardhatcode 2020-04-14 10:46:07 +02:00
parent 154fbe6fe8
commit e687816421
2 changed files with 42 additions and 1 deletions
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3
README.md
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@ -24,6 +24,7 @@ reMarkable screen sharing over SSH.
- `-s --source`: the ssh destination of the reMarkable (default: `root@10.11.99.1`)
- `-o --output`: path of the output where the video should be recorded, as understood by `ffmpeg`; if this is `-`, the video is displayed in a new window and not recorded anywhere (default: `-`)
- `-f --format`: when recording to an output, this option is used to force the encoding format; if this is `-`, `ffmpeg`’s auto format detection based on the file extension is used (default: `-`).
- `-w --webcam`: record to a video4linux2 web cam device. By default the first found web cam is taken, this can be overwritten with `-o`. The video is scaled to 1280x720 to ensure compatibility with MS Teams, Skype for business and other programs which need this specific format.
If you have problems, don't hesitate to [open an issue](https://github.com/rien/reStream/issues/new) or [send me an email](mailto:rien.maertens@posteo.be).
@ -38,7 +39,7 @@ On your **reMarkable** nothing is needed, unless you want...
### Sub-second latency
To achieve sub-second latency, you'll need [lz4](https://github.com/lz4/lz4)
To achieve sub-second latency, you'll need [lz4](https://github.com/lz4/lz4)
on your host and on your reMarkable.
You can install `lz4` on your host with your usual package manager. On Ubuntu,

40
reStream.sh
View File

@ -5,6 +5,7 @@ ssh_host="root@10.11.99.1" # remarkable connected through USB
landscape=true # rotate 90 degrees to the right
output_path=- # display output through ffplay
format=- # automatic output format
webcam=false # not to a webcam
# loop through arguments and process them
while [ $# -gt 0 ]; do
@ -28,6 +29,27 @@ while [ $# -gt 0 ]; do
shift
shift
;;
-w | --webcam)
webcam=true
format="v4l2"
# check if there is a modprobed v4l2 loopback device
# use the first cam as default if there is no output_path already
cam_path=$(v4l2-ctl --list-devices \
| sed -n '/^[^\s]\+platform:v4l2loopback/{n;s/\s*//g;p;q}')
# fail if there is no such device
if [ -e "$cam_path" ]; then
if [ "$output_path" = "-" ]; then
output_path="$cam_path"
fi
else
echo "Could not find a video loopback device, did you"
echo "sudo modprobe v4l2loopback"
exit 1
fi
shift
;;
-h | --help | *)
echo "Usage: $0 [-p] [-s <source>] [-o <output>] [-f <format>]"
echo "Examples:"
@ -36,6 +58,7 @@ while [ $# -gt 0 ]; do
echo " $0 -s 192.168.0.10 # connect to different IP"
echo " $0 -o remarkable.mp4 # record to a file"
echo " $0 -o udp://dest:1234 -f mpegts # record to a stream"
echo " $0 -w # write to a webcam (yuv420p + resize)"
exit 1
;;
esac
@ -96,6 +119,23 @@ window_bytes="$((width * height * bytes_per_pixel))"
# rotate 90 degrees if landscape=true
$landscape && video_filters="$video_filters,transpose=1"
# Scale and add padding if we are targeting a webcam because a lot of services
# expect a size of exactly 1280x720 (tested in Firefox, MS Teams, and Skype for
# for business). Send a PR is you can get a heigher resolution working.
if $webcam; then
video_filters="$video_filters,format=pix_fmts=yuv420p"
if $landscape; then
render_width=$((720 * height / width))
else
render_width=$((720 * width / height))
fi
# center
offset_left=$(((1280 - render_width) / 2))
video_filters="$video_filters,scale=${render_width}x720"
video_filters="$video_filters,pad=1280:720:$offset_left:0:#eeeeee"
fi
# set each frame presentation time to the time it is received
video_filters="$video_filters,setpts=(RTCTIME - RTCSTART) / (TB * 1000000)"