[FFmpeg-devel] URLs or not URLs (was: 01/48] avcodec/packet: deprecate) av_init_packet()

[Nicolas George]

Marton Balint (12021-03-21):
> Same what I did with AVFormat->filename / AVFormat->url.

By the way, about that: at some point, we will need to clarify what part
of our API uses real URLs and what parts uses fake URLs.

Because as it is, a lot of code looks like it uses URLs but really it
does not. The worst offender is "file:" it looks like an URL, the prefix
is a 100% standard URL scheme. Yet, it will not find
file:///home/user/Some%20Movie.mkv because it does not obey to the
standard syntax of file:// URLs.

I had the vague intent of proposing a migration path, but never time to
work on it. It involves:

1. Introduce the fs: protocol as a synonym for file:.

2. For some time, detect if the behavior is likely to change in the next
   step and warn the user.

3. Detect file:// and treat it like a standard file:// URL, including
   skipping the server, query and fragment part and performing
   %-unescaping; keep file: without the double slash as an alias for
   fs:.

4. For some more time, warn users if they are using file: but not
   file://.

5. Remove the compatibility file: → fs: alias.

Regards,

-- 
  Nicolas George
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