Importing Options

File importing syntax:
 "#video" "#audio"  base import for most AV files
 "#trackID=ID"        track import for IsoMedia and other files
 "#pid=ID"            stream import from MPEG-2 TS
 ":dur=D"             imports only the first D seconds
 ":lang=LAN"          sets imported media language code
 ":delay=delay_ms"    sets imported media initial delay in ms
 ":par=PAR"           sets visual pixel aspect ratio (PAR=Num:Den)
 ":name=NAME"         sets track handler name
 ":ext=EXT"           overrides file extension when importing
 ":hdlr=code"         sets track handler type to the given code point (4CC)
 ":disable"           imported track(s) will be disabled
 ":group=G"           adds the track as part of the G alternate group.
                         If G is 0, the first available GroupID will be picked.
 ":fps=VAL"           same as -fps option
 ":agg=VAL"           same as -agg option
 ":par=VAL"           same as -par option
 ":dref"              same as -dref option
 ":nodrop"            same as -nodrop option
 ":packed"            same as -packed option
 ":sbr"               same as -sbr option
 ":sbrx"              same as -sbrx option
 ":ps":               same as -ps option
 ":psx":              same as -psx option
 ":ovsbr":            same as -ovsbr option
 ":mpeg4"             same as -mpeg4 option
 ":svc"               import SVC with explicit signaling (no AVC base compatibility)
 ":nosvc"             discard SVC data when importing
 ":subsamples"        adds SubSample information for AVC+SVC
 ":forcesync"         forces non IDR samples with I slices to be marked as sync points (AVC GDR)
       !! RESULTING FILE IS NOT COMPLIANT WITH THE SPEC but will fix seeking in most players
 ":font=name"         specifies font name for text import (default "Serif")
 ":size=s"            specifies font size for text import (default 18)
 ":stype=4CC"         forces the sample description type to a different value
                         !! THIS MAY BREAK THE FILE WRITING !!
 ":chap"              specifies the track is a chapter track
 ":layout=WxHxXxY"    specifies the track layout
                         - if W (resp H) = 0, the max width (resp height) of
                         the tracks in the file are used.
                         - if Y=-1, the layout is moved to the bottom of the
                         track area
                         - X and Y can be omitted (:layout=WxH)

 -add file              add file tracks to (new) output file
 -cat file              concatenates file samples to (new) output file
                         * Note: creates tracks if needed
 -force-cat             skips media configuration check when concatenating file
                         !!! THIS MAY BREAK THE CONCATENATED TRACK(S) !!!
 -keep-sys              keeps all MPEG-4 Systems info when using '-add' / 'cat'
 -keep-all              keeps all existing tracks when using '-add'
                         * Note: only used when adding IsoMedia files

All the following options can be specified as default or for each track.
When specified by track the syntax is ":opt" or ":opt=val".

 -dref                  keeps media data in original file
 -no-drop               forces constant FPS when importing AVI video
 -packed                forces packed bitstream when importing raw ASP
 -sbr                   backward compatible signaling of AAC-SBR
 -sbrx                  non-backward compatible signaling of AAC-SBR
 -ps:                   backward compatible signaling of AAC-PS
 -psx:                  non-backward compatible signaling of AAC-PS
 -ovsbr:                oversample SBR
                         * Note: SBR AAC, PS AAC and oversampled SBR cannot be detected at import time
 -fps FPS               forces frame rate for video and SUB subtitles import
                         FPS is either a number or expressed as timescale-increment
                         * For raw H263 import, default FPS is 15
                         * For all other imports, default FPS is 25
                         !! THIS IS IGNORED FOR IsoMedia IMPORT !!
 -mpeg4                 forces MPEG-4 sample descriptions when possible (3GPP2)
                         For AAC, forces MPEG-4 AAC signaling even if MPEG-2
 -agg N                 aggregates N audio frames in 1 sample (3GP media only)
                         * Note: Maximum value is 15 - Disabled by default

