AGS: Avoid playing unsupported WMV videos and look for alternatives

[tag2015]

A few (old) AGS games use WMV videos, which are not supported.
Notable examples are:
The Marionette https://archive.org/details/the-marionette
EGRESS https://kramsdesign.com/egress.html
Ghostdream (Steam)
However, the files can be easily converted to supported formats using ffmpeg or similar software.

This PR simply looks for files with the same name but a supported extension and plays those in place of the original,
allowing players to add their replacements.
Also shows a warning that wmv files are not supported (and avoids crashing the entire engine)
The warning says "Consult ScummVM wiki for details", I plan to add a brief explanation on the AGS engine page.

[bluegr]

The part where replacement videos are checked in place of the unsupported WMV ones makes sense. However, why did you extend this to other video formats, as well (e.g. MPGs and OGVs)? It doesn't make sense for players to transcode game videos, if they are properly supported.

[tag2015]

The part where replacement videos are checked in place of the unsupported WMV ones makes sense. However, why did you extend this to other video formats, as well (e.g. MPGs and OGVs)? It doesn't make sense for players to transcode game videos, if they are properly supported.

No, it's not supposed to do that. Maybe the code is not very clear?
It works the exact same way as before, looking at the extension and calling the relative function (play_theora or play_mpeg etc.). The only difference is that it uses a pointer (file_ext) to the extension inside filename instead of doing strlen(name) - 3. If file_ext is NOT wmv/wfl it just calls the relative function, otherwise it replaces it with the first candidate (ogv) and sets the wmv boolean. If an ogv file is not available, it replaces the extension with "mpg" and so on. If none is found, a warning message is shown.

By the way if you want to test the PR, Tales from the Outer Zone 1 uses an OGV movie at the beginning and should play normally. EGRESS uses a WMV file and should display the warning

[bluegr]

The part where replacement videos are checked in place of the unsupported WMV ones makes sense. However, why did you extend this to other video formats, as well (e.g. MPGs and OGVs)? It doesn't make sense for players to transcode game videos, if they are properly supported.

No, it's not supposed to do that. Maybe the code is not very clear? It works the exact same way as before, looking at the extension and calling the relative function (play_theora or play_mpeg etc.). The only difference is that it uses a pointer (file_ext) to the extension inside filename instead of doing strlen(name) - 3. If file_ext is NOT wmv/wfl it just calls the relative function, otherwise it replaces it with the first candidate (ogv) and sets the wmv boolean. If an ogv file is not available, it replaces the extension with "mpg" and so on. If none is found, a warning message is shown.

By the way if you want to test the PR, Tales from the Outer Zone 1 uses an OGV movie at the beginning and should play normally. EGRESS uses a WMV file and should display the warning

Sorry! My bad. Should have checked the code better, especially the && wmv part :)

if (!play_success && wmv) {
    ....
}

[sev-]

Thanks, merging.

I wonder, which codecs are we missing here. Perhaps, those could be added relatively easily?