How to pass coordinates to capture video from X server interactively to ffmpeg?

Question

linux

I borrowed the command from here.

ffmpeg -f x11grab -s $(slop --noopengl --format "%w"x"%h") -r 60 -i :0.0 -qscale 0 -vcodec huffyuv $(date +"%d.%m.%Y_%H:%M:%S").avi

but this only works if there are no indents during recording, that is, in other words, the entire screen is recorded. Screen Position Offset For example, by specifying "-s 800x600 -i :0.0+200,100" you can write an 800x600 block with an offset of 200x100 from the top left corner of the screen.

More or less like this:

ffmpeg -f x11grab -s 800x600 -r 60 -i :0.0+200,100 -qscale 0 -vcodec huffyuv $(date +"%d.%m.%Y_%H:%M:%S").avi

Tell me how to make it so that you can interactively select with the mouse using the same slop and then transfer these coordinates to ffmpeg.

Answer 1

try xrectsel
under ffmpeg finished it yourself

as an example: a script that writes a gif using byzanz-record

#!/bin/bash

NAME="$(date +%d.%m.%Y_%H%M%S).gif"

DEFAULT_DURATION=10

echo -ne "Select area which will be recorded" 

AREA="$(xrectsel)"
IFS=+ read DIM X Y <<< $AREA
IFS=x read W H <<< $DIM

echo ""

#read -p "Enter recording duration in seconds: " USERDUR

# Duration and output file
if [ $USERDUR -gt 0 ]; then
    DURATION=$USERDUR
else
    DURATION=$DEFAULT_DURATION
fi

echo "$DURATION sec. Recording has started..." 

byzanz-record --cursor --duration=$DURATION --x=$X --y=$Y --width=$W --height=$H /tmp/"$NAME"

echo "Recording has ended."
if [ -f /tmp/"$NAME" ]; then
    xviewer /tmp/"$name"
fi

byzanz-record also writes videos ogg, ogv, webm