Backport of "avidemux: Also detect 0x000001 as H264 byte-stream start code in codec_data" into 1.18
Backport of !1072 (merged) "avidemux: Also detect 0x000001 as H264 byte-stream start code in codec_data".
Commits:
- fedd6c2a avidemux: Also detect 0x000001 as H264 byte-stream start code in codec_data