avformat/mpegts: improve first valid PMT heuristic

This checks for audio+video instead of streams > 2
Fixes Ticket4090

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/mpegts.c

@@ -2207,7 +2207,12 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
                     break;
             }
             if (i == ts->nb_prg && ts->nb_prg > 0) {
-                if (ts->stream->nb_streams > 1 || pos > 100000) {
+                int types = 0;
+                for (i = 0; i < ts->stream->nb_streams; i++) {
+                    AVStream *st = ts->stream->streams[i];
+                    types |= 1<<st->codec->codec_type;
+                }
+                if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
                     av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
                     ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
                 }