mux: mp4: add fragmented mp4 muxer

mp4stream tries to build stream with 1.5sec runs.
mp4frag aims files by creating a compatible index.

Might need for transcode tests (fragments are 1.5 sec only).
--sout-x264-keyint=30 --sout-avcodec-strict=-2

Streaming done using http, with fragment start used as iframes.

NEWS

@@ -16,6 +16,9 @@ Decoder:
 Demuxers:
  * Support HD-DVD .evo (H.264, VC-1, MPEG-2, PCM, AC-3, E-AC3, MLP, DTS)
 
+Muxers:
+ * Added fragmented/streamable MP4 muxer
+
 Service Discovery:
  * New NetBios service discovery using libdsm
 

modules/mux/Modules.am

 SOURCES_mux_dummy = dummy.c
 SOURCES_mux_avi = avi.c
 SOURCES_mux_ogg = ogg.c
-SOURCES_mux_mp4 = mp4.c ../demux/mpeg/mpeg_parser_helpers.h
+SOURCES_mux_mp4 = mp4.c ../demux/mpeg/mpeg_parser_helpers.h ../demux/mp4/libmp4.h
 SOURCES_mux_asf = asf.c ../demux/asf/libasf_guid.h
 SOURCES_mux_wav = wav.c
 SOURCES_mux_mpjpeg = mpjpeg.c