[FFmpeg-user] Mpeg PID vs. program id?

[Andy Furniss]

Roger Pack wrote:
> Hello.  I'm trying to understand how MPEG mapping terminology works.
>
> Given this type of input:
> $ ffmpeg -i INPUT
> ...
> Input #0, mpegts, from 'INPUT':
>    Duration: N/A, start: 22159.226833, bitrate: N/A
>    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)
>
> I know I can "map out" streams by using
>
> ffmpeg -i INPUT -map 0:p:1346 #  both inputs from program 1344
>
> or to select a single stream
>
> ffmpeg -i INPUT -map i:0x40
>
> Question:
> in this documentation:
>
> https://ffmpeg.org/ffmpeg.html#Stream-specifiers-1
>
> It refers to the first example as selecting by "program id"
> and the second example as selecting
> "by stream id (e.g. PID in MPEG-TS container)."
>
> What is the difference between "program id" and "PID" in this
> verbiage? Does PID stand for program id here?

https://en.wikipedia.org/wiki/MPEG_transport_stream

PID = Packet Identifier


> It works, just wondering.
> Also as a follow up, is it possible to select by service_name (7TWO in
> this instance)?
> Thanks!
> -roger-
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