Add request_frame() which checks the black duration when the end of the
stream is signalled. Allow to detect black video segments at the end of
the stream.
Note that the reported last black video segment duration is not very
accurate, since we still miss the duration information in the video
buffer.
Address trac ticket #1470.
While here:
- add missing .version and .category,
- make .class_name consistent across filters,
- align declarations.
Signed-off-by: Paul B Mahol <onemda@gmail.com>
avfilter_default_filter_name() is supposed to access an AVFilterContext
struct, if used with a private struct it will cause a crash since it will
access fields which are non defined in the private struct.
The function is modelled after av_default_item_name(), and will print the
name of the instance filter if defined, otherwise the name of the filter.
This allows to show the instance name in the log, which is useful when
debugging complex filter graphs.
Also add internal function ff_null_start_frame_keep_ref().
Fix crash when a following filter (e.g. settb) will unref the reference
passed by start_frame(), and then the reference is accessed in
end_frame() through inlink->cur_buf.
