On 9/14/2024 7:45 AM, 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 | 387 +++++++++++++++++++++++++++++++++++++- fftools/ffmpeg_demux.c | 24 ++- fftools/ffmpeg_filter.c | 71 ++++--- fftools/ffmpeg_mux_init.c | 34 ++-- fftools/ffmpeg_opt.c | 70 ++++++- 9 files changed, 610 insertions(+), 55 deletions(-)diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index 842e92ad1a..34007f7ea2 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -1799,7 +1799,7 @@ Set the size of the canvas used to render subtitles. @section Advanced options@table @option-@item -map [-]@var{input_file_id}[:@var{stream_specifier}][?] | @var{[linklabel]} (@emph{output}) +@item -map [-]@var{input_file_id}[:@var{stream_specifier}][:@var{view_specifier}][?] | @var{[linklabel]} (@emph{output})Create one or more streams in the output file. This option has two forms forspecifying the data source(s): the first selects one or more streams from some @@ -1814,6 +1814,26 @@ only those streams that match the specifier are used (see the A @code{-} character before the stream identifier creates a "negative" mapping. It disables matching streams from already created mappings.+An optional @var{view_specifier} may be given after the stream specifier, which+for multiview video specifies the view to be used. The view specifier may have +one of the following formats: +@table @option +@item view:@var{view_id} +select a view by its ID; @var{view_id} may be set to 'all' to use all the views +interleaved into one stream; + +@item vidx:@var{view_idx} +select a view by its index; i.e. 0 is the base view, 1 is the first non-base +view, etc.
I tried ./ffmpeg -i ../build/multiview.mov -map 0:v:view:1 -an -sn -f null - and ./ffmpeg -i ../build/multiview.mov -map 0:v:vidx:1 -an -sn -f null -with multiview.mov and in both cases both views are output. Am i missing something? I recall this working before. view:0 and vidx:0 work the same as not setting any map (Just the base view is output), which is intended.
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