--info flag returns invalid JSON

[Mason McLead]

When getting the metadata about the files the json_add_key_value method creates JSON values with invalid characters.

This causes the returned JSON to be invalid.

See this branch for updated code with a fix

https://github.com/mmclead/ffmpeg2theora/tree/strip-extra-character-in-json

Here is a pull request to my own repository

https://github.com/mmclead/ffmpeg2theora/pull/1

[Nick Messick (nmessick)]

Here is an example of some invalid JSON output from ffmpeg2theora: https://gist.github.com/messick/8202020

the key "handler_name" has a value with a '\f' character, which is illegal according to defintition of "char" on json.org. The following lists should be escaped:

\"
\\
\/
\b
\f
\n
\r
\t
\u four-hex-digits

[j^ (j)]

https://git.xiph.org/?p=ffmpeg2theora.git;a=commit;h=f79141a