From e68781642112eb5c371ebfa5884265f3c47c9ff9 Mon Sep 17 00:00:00 2001 From: beardhatcode Date: Tue, 14 Apr 2020 10:46:07 +0200 Subject: [PATCH] Add video4linux2 support --- README.md | 3 ++- reStream.sh | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/README.md b/README.md index db4fbb7..4526ab7 100644 --- a/README.md +++ b/README.md @@ -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, diff --git a/reStream.sh b/reStream.sh index a5e3062..97c8067 100755 --- a/reStream.sh +++ b/reStream.sh @@ -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 ] [-o ] [-f ]" 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)"