Tell av_buffersink_get_buffer_ref() not to request a frame from its input. If a frame is already buffered, it is read (and removed from the buffer), but if no frame is present, return AVERROR(EAGAIN).
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Tell av_buffersink_get_buffer_ref() not to request a frame from its input. If a frame is already buffered, it is read (and removed from the buffer), but if no frame is present, return AVERROR(EAGAIN).