MKVMerge query

[Island_Dweller]

I'm trying to sync a video (avc) with a flac file. The issue is the audio file has about 8133 miliseconds (195 video frames) of valid audio data (drums and other instruments) before the beginning of the video. Using MKVMerge to mux the audio and video, I set a video delay of 8133 ms (instead of -8133 ms for the audio) but on playback, the audio is cut off and the video starts straight away. Is there a way to do this without re-encoding the video?

[Cornucopia]

You create a piece of black video, matching exactly the specs of the original video and matching the length of the extra audio, and then demux the V and join the Black+V, then remux with the audio.

Scott

[Island_Dweller]

That would seem like an ideal solution. I've created a black video with avisynth using BlankClip().

MediaInfo gives the following settings for the main video :

cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=7 / psy=1 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=6 / nr=0 / decimate=1 / mbaff=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / wpredb=1 / keyint=250 / keyint_min=25 / scenecut=40 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=6481 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00

So, how do I encode it with x264.exe? Is there a particular command line I can use?