James Almer c751ad2c36 fftools/ffmpeg_mux_init: allow creating streams from filtergraphs created out of stream groups ...

Several formats are being designed where more than one independent video or
audio stream within a container are part of what should be a single combined
output. This is the case for HEIF (Defining a grid where the decoded output
of several separate video streams are to be placed to generate a single output
image) and IAMF (Defining audio streams where channels are present in separate
coded stream).

AVStreamGroup was designed and implemented in libavformat to convey this
information, but the actual merging is left to the caller.
This change allows the FFmpeg CLI to take said information, parse it, and
create filtergraphs to merge the streams, making the combined output be usable
automatically further in the process.

Signed-off-by: James Almer <jamrial@gmail.com>

2025-10-30 11:02:01 -03:00

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