tests/concat-demuxer: add stream_meta test

tests/ref/fate/concat-demuxer-simple2-lavf-ts

@@ -211,5 +211,5 @@ video|1|171982|1.910911|168382|1.870911|3600|0.040000|17440|206988|__MPEGTS Stre
 
 video|1|175582|1.950911|171982|1.910911|3600|0.040000|15019|224848|__MPEGTS Stream ID|224
 
-0|mp2|unknown|audio|[3][0][0][0]|0x0003|s16p|44100|1|mono|0|N/A|0/0|0/0|1/90000|0|0.000000|N/A|N/A|64000|N/A|N/A|N/A|N/A|89|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0
-1|mpeg2video|4|video|[2][0][0][0]|0x0002|352|288|0|0|0|0|1|1:1|11:9|yuv420p|8|tv|unknown|unknown|unknown|left|progressive|1|N/A|25/1|25/1|1/90000|N/A|N/A|N/A|N/A|N/A|N/A|N/A|N/A|N/A|60|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0
+0|mp2|unknown|audio|[3][0][0][0]|0x0003|s16p|44100|1|mono|0|N/A|0/0|0/0|1/90000|0|0.000000|N/A|N/A|64000|N/A|N/A|N/A|N/A|89|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|this is stream 0
+1|mpeg2video|4|video|[2][0][0][0]|0x0002|352|288|0|0|0|0|1|1:1|11:9|yuv420p|8|tv|unknown|unknown|unknown|left|progressive|1|N/A|25/1|25/1|1/90000|N/A|N/A|N/A|N/A|N/A|N/A|N/A|N/A|N/A|60|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|this is stream 1

tests/simple2.ffconcat

@@ -2,8 +2,10 @@ ffconcat version 1.0
 
 stream    0
 exact_stream_id 257
+stream_meta dummy 'this is stream 0'
 stream    1
 exact_stream_id 256
+stream_meta dummy 'this is stream 1'
 
 file      %SRCFILE%