[FFmpeg-devel] [PATCH v3] lavfi: add new iteration API

[Paul B Mahol]

On 4/13/20, Josh Allmann <joshua.allmann at gmail.com> wrote:
> Hi,
>
> On Sat, 24 Mar 2018 at 14:40, Josh de Kock <josh at itanimul.li> wrote:
>>
>> Signed-off-by: Josh de Kock <josh at itanimul.li>
>> ---
>>  configure                |  29 +-
>>  doc/APIchanges           |   4 +
>>  doc/writing_filters.txt  |   6 +-
>>  libavfilter/allfilters.c | 823
>> +++++++++++++++++++++++++----------------------
>>  libavfilter/avfilter.c   |  50 +--
>>  libavfilter/avfilter.h   |  29 +-
>>  libavfilter/version.h    |   3 +
>>  7 files changed, 489 insertions(+), 455 deletions(-)
>>
>
> This is a couple years too late, but wanted to drop a note that this
> particular API change was breaking : it made avfilter_register a
> no-op. The consequence is that it's much more difficult to maintain
> filters out-of-tree; preserving the old behavior without changes to
> user code requires a special build of ffmpeg that has the filter
> configured/compiled in. The recommended workaround of using
> avfilter_graph_alloc_filter requires more effort to wire the filter in
> explicitly. It also doesn't allow for conveniences such as using
> avfilter_graph_parse, since there doesn't seem to be a way to make
> filters accessible via avfilter_get_by_name outside of ffmpeg compile
> time.
>
> If there is another workaround that I'm missing, please let me know,
> or if there's some deeper rationale for the decision to disable this
> feature.

Out of tree filters are not supported.

>
> Josh
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