[FFmpeg-devel] [PATCH 38/42] fftools/ffmpeg: add support for multiview video

[James Almer]

On 8/29/2024 8:26 PM, Michael Niedermayer wrote:
> On Tue, Aug 27, 2024 at 05:05:18PM +0200, Anton Khirnov wrote:
>> This extends the syntax for specifying input streams in -map and complex
>> filtergraph labels, to allow selecting a view by view ID, index, or
>> position. The corresponding decoder is then set up to decode the
>> appropriate view and send frames for that view to the correct
>> filtergraph input(s).
>> ---
>>   doc/ffmpeg.texi           |  30 +++-
>>   fftools/cmdutils.c        |   2 +-
>>   fftools/cmdutils.h        |   2 +
>>   fftools/ffmpeg.h          |  45 ++++-
>>   fftools/ffmpeg_dec.c      | 355 +++++++++++++++++++++++++++++++++++++-
>>   fftools/ffmpeg_demux.c    |  24 ++-
>>   fftools/ffmpeg_filter.c   |  71 +++++---
>>   fftools/ffmpeg_mux_init.c |  29 +++-
>>   fftools/ffmpeg_opt.c      |  70 +++++++-
>>   9 files changed, 575 insertions(+), 53 deletions(-)
> 
> breaks build on mingw64
> 
> src/fftools/ffmpeg_dec.c: In function ‘packet_decode’:
> src/fftools/ffmpeg_dec.c:811:19: error: implicit declaration of function ‘ffs’ [-Werror=implicit-function-declaration]
>    811 |             pos = ffs(outputs_mask) - 1;
>        |                   ^~~
> cc1: some warnings being treated as errors
> make: *** [src/ffbuild/common.mak:81: fftools/ffmpeg_dec.o] Error 1
> make: *** Waiting for unfinished jobs....
> 
> thx

Would ff_clz(outputs_mask) work here?