Changes between Version 8 and Version 9 of Map

Timestamp:

Dec 30, 2015, 7:20:28 PM (11 years ago)

Author:

Roger Pack

Comment:

add MPEG select example yikes

Map

@@ -173 +173 @@
 
 == Example 8 ==
-Copy "all" inputs to the output.  The default behavior is to copy only one audio and one video channel.  If you want to copy 'all' channels, use "-map"
+MPEG stream selection:
+
+The tricky part with selecting from MPEG TS is it may contain multiple streams/channels, and if you are receiving "live data" just specifying an index might not work because it can change from run to run, so
+{{{
+ffmpeg -i INPUT -map 0:6 OUTPUT # might not work the same every run.
+}}}
+
+Assuming your file is like this:
+{{{ 
+$ ffmpeg -i INPUT
+...
+Input #0, mpegts, from 'INPUT':
+  Duration: N/A, start: 22159.226833, bitrate: N/A
+  Program 1344
+    Metadata:
+      service_name    : 7 Digital
+      service_provider: Seven Network
+    Stream #0:0[0x401]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x576 [SAR 64:45 DAR 16:9], max. 14950 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
+    Stream #0:1[0x402](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 256 kb/s
+  Program 1346
+    Metadata:
+      service_name    : 7TWO
+      service_provider: Seven Network
+    Stream #0:3[0x406]: Unknown: none ([5][0][0][0] / 0x0005)
+    Stream #0:6[0x421]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x576 [SAR 64:45 DAR 16:9], max. 14950 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
+    Stream #0:7[0x422](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s
+    Stream #0:8[0x424](eng): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006), 492x250
+    Stream #0:4[0x499]: Unknown: none ([11][0][0][0] / 0x000B)
+}}}
+you could specify desired streams by program id:
+{{{
+ffmpeg -i INPUT -map 0:p:1344 OUTPUT # pulls in both inputs from program 1344
+}}}
+or specify a child stream:
+{{{
+ffmpeg -i INPUT -map i:0x401 OUTPUT # pulls in input stream 0x401
+}}}
+or similar, see other specifier examples.   NB if you have "unknown" streams in there you may need to add the -ignore_unknown flag as well.
+
+== Example 9 ==
+Include "all" inputs to the output.  The default behavior is to copy only one audio and one video channel.  If you want to copy 'all' channels, use "-map"
 {{{
 ffmpeg -i input -map 0 output.mp4 # re encodes all video and audio channels from input one