Small patch for FFmpeg completion function

[Haakon Riiser <haakon.riiser@fys.uio.no>]

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 This is a patch for Completion/Unix/Command/_ffmpeg (CVS rev 1.2)
 It adds the "copy" keyword as an extra completion to -acodec and 
 -vcodec.

-- 
  Haakon

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--- _ffmpeg	26 Apr 2011 21:36:04 -0000	1.9
+++ _ffmpeg	26 Apr 2011 21:36:17 -0000	1.10
@@ -11,27 +11,27 @@
 }
 
 _ffmpeg_presets() {
     local presets
     presets=(~/.ffmpeg/*.ffpreset(:t:r) "$FFMPEG_DATADIR"/*.ffpreset(:t:r))
     _ffmpeg_compadd 'select preset' presets ''
 }
 
 _ffmpeg_acodecs() {
     local acodecs
-    acodecs=(${${(M)${(f)"$(ffmpeg -codecs 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]]A[S[:space:]][D[:space:]][T[:space:]][[:space:]][^[:space:]]##*}//(#b)????????([^[:space:]]##)*/$match[1]})
+    acodecs=(copy ${${(M)${(f)"$(ffmpeg -codecs 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]]A[S[:space:]][D[:space:]][T[:space:]][[:space:]][^[:space:]]##*}//(#b)????????([^[:space:]]##)*/$match[1]})
     _ffmpeg_compadd 'force audio codec (''copy'' to copy stream)' acodecs ''
 }
 
 _ffmpeg_vcodecs() {
     local vcodecs
-    vcodecs=(${${(M)${(f)"$(ffmpeg -codecs 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]]V[S[:space:]][D[:space:]][T[:space:]][[:space:]][^[:space:]]##*}//(#b)????????([^[:space:]]##)*/$match[1]})
+    vcodecs=(copy ${${(M)${(f)"$(ffmpeg -codecs 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]]V[S[:space:]][D[:space:]][T[:space:]][[:space:]][^[:space:]]##*}//(#b)????????([^[:space:]]##)*/$match[1]})
     _ffmpeg_compadd 'force video codec (''copy'' to copy stream)' vcodecs ''
 }
 
 _ffmpeg_formats() {
     local formats
     formats=(${(ou)${=${(s:,:)${${(M)${(f)"$(ffmpeg -formats 2>/dev/null)"}:#[[:space:]][D[:space:]][E[:space:]][[:space:]][^[:space:]]##*}//(#b)????([^[:space:]]##)*/$match[1]}}}})
     _ffmpeg_compadd 'force format' formats ''
 }
 
 _ffmpeg_list_pix_fmts() {