mpegtsmux program number bug?

Peter Maersk-Moller pmaersk at gmail.com
Tue Jun 9 04:24:46 PDT 2015


Forgot to mention. The supposedly program-number bug is tested with
GStreamer 1.4.5.

best regards
Peter

On Mon, Jun 8, 2015 at 3:41 AM, Peter Maersk-Moller <pmaersk at gmail.com>
wrote:

> Hi
>
> When I try to set the program number for the mpegtsmux using the pipeline,
> it all works quite well until I try to set a program number above 31. Using
> a program number above 31, makes the mux set the program number to 1. It
> furthermore creates complications, if I have two streams and they both have
> a program number above 31. Then I only get one program with the number 1
> possibly with both pes pids (not verified)
>
> The pipelines used for test are these:
>
> pid1=300
> pnum1=31
> # (works)
> pnum1=32
> # (program gets number 1)
>
> gst-launch-1.0 videotestsrc is-live=1  ! 'video/x-raw,framerate=15/1' !
> videoconvert ! x264enc speed-preset=2 ! h264parse ! queue ! mux.sink_$pid1
> mpegtsmux name=mux prog-map=program_map,sink_$pid1=$pnum1 ! chopmydata
> max-size=1316 min-size=1316 ! udpsink host=127.0.0.1 port=10074
>
> pid1=300
> pid2=301
> pnum1=32
> pnum2=33
> # both pid1 and pid2 are associated with program 1 and not 32 and 33
>
> gst-launch-1.0 videotestsrc is-live=1  ! 'video/x-raw,framerate=15/1' !
> videoconvert ! x264enc speed-preset=2 ! queue ! tee name=t ! h264parse !
> queue ! mux.sink_$pid1 mpegtsmux name=mux
> prog-map=program_map,sink_$pid1=$pnum1,sink_$pid2=$pnum2 ! chopmydata
> max-size=1316 min-size=1316 ! tcpserversink host=127.0.0.1 port=10074 t. !
> h264parse ! queue ! mux.sink_$pid2
>
> pid1=300
> pid2=301
> pnum1=31 (works)
> pnum1=32 (program gets number 1)
>
> As far as I can read in the standard, the 16 bit field for program number
> in the PAT packet and in the PMT packet allows for program number between
> 1-2^16-1 although ATSC reserves 2^16-1 for some analogue stuff.
>
> So is this a bug?
>
> Best regards
> Peter Maersk-Moller
>
>
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