Allowing for rate < 0 enables rewind playback for eg: RTSP streams.
Don't allow rate < 0 when p_input->p->input.b_rescale_ts is true. Setting b_rescale_ts to true says to vlc, rescale the timestamp. Setting it to false is like saying, I can completely handle the rate, just aknoledge the fact that the rate is not the default one.
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