Merge commit 'e7fdd6aa0d11c3e144988d7090f972224799e07f' into release/2.2
* commit 'e7fdd6aa0d11c3e144988d7090f972224799e07f':
avconv: Use the mpeg12 private option scan_offset
Conflicts:
ffmpeg_opt.c
See: e479013ae4
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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