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fdatasync is not exported. Fallback on fsync.

It was duplicated with es_format_t::i_sar_num/den.

It is needed as long as we cannot directly get an opengl context
from a vout_thread_t.

PPM image format is already supported in FFMPEG. It would be possible to
support it in vlc too with the following patch.
The targetted usage of this change is to be able to do:
vlc --fake-file image.ppm fake://
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Also, let the possibility to run vlc -H.

Pointed-out-by Rémi Denis-Courmont <remi@remlab.net>.

psz_logmode is tested for NULLity, so we need to use *NonEmpty*.
Also, always delete the variable. If the reference count was 1, we will
revert back to the configuration value, which makes no difference.

This is done to better diagnosticate misconfiguration of libvlc path.

It is used in many places, namely all X11 plugins _except_ the video
display ones. So it did not make much sense to keep it there IMHO.

* set a meta (without changing the file)
* save all meta to the file

A weirdness was introduced somehow. We were relying on the media state. (!)

Also, make sure that we always require stop() to be called when the media_player is destroyed. This may prevent some unwanted bad usage, whose consequence might be that _release() will block on input thread destruction.