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h264: dump a chunk of frame that failed to decode

--- a/decoder_h264.c

+++ b/decoder_h264.c

@@ -212,8 +212,9 @@

 	lasttimestamp = 0;

 	start = nanosec();

 	for(res = 0, framenum = 0; res >= 0 && (res = Sread(d->s, &sf)) == 0 && sf.sz > 0; framenum++){

+		fprint(2, "%d %.*H\n", framenum, MIN(32, sf.sz), sf.buf);

 		if((res = WelsDecodeBs(&a->ctx, sf.buf, sf.sz, a->data, &a->info, nil)) != 0){

-			werrstr("%s on frame %llud", err2s(res), framenum);

+			werrstr("%s on frame %llud: %.*H", err2s(res), framenum, MIN(32, sf.sz), sf.buf);

 			break;

 		}

 		if(a->info.iBufferStatus == 0)

--- a/main.c

+++ b/main.c

@@ -176,6 +176,9 @@

 		[Cnum] = { nil, nil, CHANEND },

 	};

+	quotefmtinstall();

+	fmtinstall('H', encodefmt);

+

 	debug = 0;

 	audio = nil;

 	ARGBEGIN{

--- a/misc.h

+++ b/misc.h

@@ -1,11 +1,10 @@

+#define MAX(a,b) ((a)>(b)?(a):(b))

+#define MIN(a,b) ((a)<(b)?(a):(b))

+

 int str2fmt(char *s);

 char *fmt2str(int fmt);

 uvlong nanosec(void);

-void yuv420_rgb24(

-	int width, int height,

-	u8int *y, u8int *u, u8int *v,

-	u32int ystride, u32int uvstride,

-	u8int *rgb, u32int rgbstride);

+void yuv420_rgb24(int width, int height, u8int *y, u8int *u, u8int *v, u32int ystride, u32int uvstride, u8int *rgb, u32int rgbstride);

 extern int nproc;

 extern int debug;