The AVFilterLink structure has a few AVFilterBufferRef fields. The
cur_buf and out_buf were used with the deprecated
start_frame/draw_slice/end_frame API and should no longer be used.
- src_buf, cur_buf_copy and partial_buf are used by libavfilter internally
+ src_buf and partial_buf are used by libavfilter internally
and must not be accessed by filters.
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