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In reverse playback, buffers have to be displayed at buffer.stop running time, otherwise a same set of buffer can't be displayed in the exact opposite order to forward playback. For example, seeking a video stream at 1fps with start=0, stop=5s, rate=1.0 will display the following buffers: b0.pts = 0s, b0.duration = 1s - at running time = 0s b1.pts = 1s, b1.duration = 1s - at running time = 1s b2.pts = 2s, b2.duration = 1s - at running time = 2s b3.pts = 3s, b3.duration = 1s - at running time = 3s b4.pts = 4s, b4.duration = 1s - at running time = 4s <wait at EOS for 1second> Now, playing that reverse with start=0, stop=5s, rate=1.0 has to display the following buffers: b0.pts = 4s, b0.duration = 1s - at running time = 0s b1.pts = 3s, b1.duration = 1s - at running time = 1s b2.pts = 2s, b2.duration = 1s - at running time = 2s b3.pts = 1s, b3.duration = 1s - at running time = 3s b4.pts = 0s, b4.duration = 1s - at running time = 4s <wait at EOS for 1second> With the previous code, it reproduced the following: b0.pts = 4s, b0.duration = 1s - at running time = 1s b1.pts = 3s, b1.duration = 1s - at running time = 2s b2.pts = 2s, b2.duration = 1s - at running time = 3s b3.pts = 1s, b3.duration = 1s - at running time = 4s b4.pts = 0s, b4.duration = 1s - at running time = 5s <NO WAIT AT EOS AND POST EOS RIGHT AWAY> This is being tested with the `validate.launch_pipeline.sink.reverse_playback_clock_waits.*` set of tests Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/450> |
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