gstreamer/tests/validate/videorate/change_rate_reverse_playback.validatetest

meta,
    # Handle EOS ourself
    ignore-eos=true,
    args = {
        # We just want each frame to be different, and we just check their content by 'id'
        "videotestsrc ! video/x-raw,format=I420,framerate=10/1,width=320,height=240 ! videorate name=videorate ! fakesink sync=true qos=true",
    },
    configs = {
        # Check dataflow on both videorate pads
        "$(validateflow), pad=videorate:sink, buffers-checksum=as-id, ignored-event-types={ tag }",
        "$(validateflow), pad=videorate:src, buffers-checksum=as-id, ignored-event-types={ tag }",
    }

seek, start=0.0, stop=5.0, flags=accurate+flush, rate=-1.0

# Crank the 5 first buffers and check position is `seek.stop - (5*(1/10fps)) = 4.5s`
crank-clock, expected-time=0.0
crank-clock, repeat=4, expected-elapsed-time=0.1
crank-clock, expected-time=0.5

# Ensure next buffer flows for expectations stability
wait, on-clock=true

# Set videorate.rate = 0.5 and add that info to the expecation files for better readability
checkpoint, text="Setting videorate.rate=0.5"
set-property, playback-time=99.0, target-element-name=videorate, property-name=rate, property-value="0.5" # playback-time=99.0 so that the action is executed asap but no on element addition

# Cranking 5 times, and let following buffer through
crank-clock, repeat=5, expected-elapsed-time=0.1
wait, on-clock=true
check-position, expected-position=4.0 # seek.stop - (10*(1/10fps)) = 4.0s

set-vars, rate=(string)0.1
checkpoint, text="Setting videorate.rate=0.1"
set-property, playback-time=99.0, target-element-name=videorate, property-name=rate, property-value="0.1"
crank-clock, repeat=20
wait, on-clock=true
check-position, expected-position=2.0 # seek.stop - (20*(1/10fps)) = 2.0s

# Now setting rate=2.0
checkpoint, text="Setting videorate.rate=2.0"
set-property, playback-time=-1, target-element-name=videorate, property-name=rate, property-value="2.0"
crank-clock, repeat=10
wait, on-clock=true

# Source is now EOS, videorate is filling up the segment with last buffer
checkpoint, text="Filling up segment with last buffer"
crank-clock, repeat=10

stop, on-message=eos