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add -t option to manually pick tracks by their ids

--- a/main.c

+++ b/main.c

@@ -12,6 +12,8 @@

 int mainstacksize = 128*1024;

+uvlong trackpref;

+

 static Image *curim;

 static u8int *curpx;

 static uvlong lastframe;

@@ -142,7 +144,7 @@

 static void

 usage(void)

 {

-	fprint(2, "usage: %s [-a AUDIO] file.mp4\n", argv0);

+	fprint(2, "usage: %s [-a AUDIOFILE] [-t N -t M ...] file.mp4\n", argv0);

 	threadexitsall("usage");

 }

@@ -181,6 +183,7 @@

 	debug = 0;

 	audio = nil;

+	trackpref = 0;

 	ARGBEGIN{

 	case 'a':

 		if(audio != nil){

@@ -200,6 +203,9 @@

 		break;

 	case 'd':

 		debug++;

+		break;

+	case 't':

+		trackpref |= 1<<atoi(EARGF(usage()));

 		break;

 	}ARGEND

--- a/stream_mc.c

+++ b/stream_mc.c

@@ -17,6 +17,8 @@

 	u8int buf[Bufsz];

 };

+extern uvlong trackpref;

+

 static int

 mcfs(char **argv, int *pipefd)

 {

@@ -75,6 +77,8 @@

 	Binit(&b, p, OREAD);

 	for(ns = naudio = nvideo = 0; ns < Maxstreams && (line = Brdstr(&b, '\n', 1)) != nil;){

 		n = tokenize(line, v, nelem(v));

+		if(trackpref != 0 && (trackpref & (1<<atoi(v[0]))) == 0)

+			continue;

 		if(n > 4 && str2fmt(v[2]) >= 0){

 			argv[1] = "-t";

 			argv[2] = v[0]; /* stream id */