demux: rewrite probing and demuxer initialization

Get rid of the strange and messy reliance on DEMUXER_TYPE_ constants.
Instead of having two open functions for the demuxer callbacks (which
somehow are both optional, but you can also decide to implement both...),
just have one function. This function takes a parameter that tells the
demuxer how strictly it should check for the file headers. This is a
nice simplification and allows more flexibility.

Remove the file extension code. This literally did nothing (anymore).

Change demux_lavf so that we check our other builtin demuxers first
before libavformat tries to guess by file extension.

1 files changed, 0 insertions, 6 deletions

diff --git a/DOCS/man/en/options.rst b/DOCS/man/en/options.rst
index d891766f6b..a6e5fee7ed 100644
--- a/DOCS/man/en/options.rst
+++ b/DOCS/man/en/options.rst
@@ -690,12 +690,6 @@
     Stop at given absolute time. Use ``--length`` if the time should be relative
     to ``--start``. See ``--start`` for valid option values and examples.
 
-``--no-extbased``, ``--extbased``
-    ``--no-extbased`` disables extension-based demuxer selection. By default,
-    when the file type (demuxer) cannot be detected reliably (the file has no
-    header or it is not reliable enough), the filename extension is used to
-    select the demuxer. Always falls back on content-based demuxer selection.
-
 ``--field-dominance=<auto|top|bottom>``
     Set first field for interlaced content. Useful for deinterlacers that
     double the framerate: ``--vf=yadif=1`` and ``--vo=vdpau:deint``.