[MPlayer-dev-eng] [PATCH] Print chapter info with -identify

[Adrian Stutz]

Hello,

Currently, the only way for a frontend to get MKV chapter information
is to turn up demux verbosity, which also makes the MKV demuxer print
a lot of other unrelated information. In case of the libavformat
demuxer, there's currently no chapter info output at all.

This patch updates demuxer_add_chapter to print all known chapter
information in a similar style to the video, audio and subtitle stream
messages.

A typical output for a single chapter then looks like:
ID_CHAPTER_ID=1
ID_CHAPTER_1_START=0
ID_CHAPTER_1_END=120996
ID_CHAPTER_1_NAME=Part A

* I've made the ID one-based to match the other uses of chapter
numbers in the OSD and the slave mode.
* Start and end are output in milliseconds, which I think is okay for
this purpose. They could also be rounded to a more readable dimension,
though.

Greetings
Adrian
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