Good DVB stream with mpegtsmux

[Antonio Jesús Díaz Honrubia]

Hello again,

Well, I have been doing some tests. I tried to save the TS in a file and
fed it to ffprobe, which said that the timestamps are incorrect (PTS < DTS,
what has no sense):

[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324002999,
dts=324008999, size=4040
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324009000,
dts=324011999, size=4042
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324014999,
dts=324020999, size=3925
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324020999,
dts=324023999, size=4048
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324027000,
dts=324032999, size=4050
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324032999,
dts=324035999, size=3886
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324038999,
dts=324044999, size=4019
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324045000,
dts=324047999, size=3891
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324050999,
dts=324056999, size=3927
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324056999,
dts=324059999, size=3865
[mpegts @ 0x3854120] Invalid timestamps stream=0, pts=324063000,
dts=324068999, size=3910

Then I tried to save the raw H.264 video, removing the muxer from pipeline
and fed that file to ffprobe and, this time, it does not say anything about
timestamps. So, I guess that the mpegtsmux is restamping the stream and it
is doing it in a wrong way. Do you think this is possible? Is there any
known bug about this?

Best regards,
Antonio.


2017-08-29 12:06 GMT+02:00 Antonio Jesús Díaz Honrubia <
antonioj.diazhonrubia at gmail.com>:

> Hello,
>
> I am trying to get a good DVB stream with gst-launch-1.0 by means of
> mpegtsmux. I achieved to generate and send a stream over UDP. I can open
> and watch it with VLC in the receiver, however, if I analyze the TS with an
> analyzer, it gives me errors all the time (see the attached screenshot).
>
> According to the errors, I think that the problem is in the adaptation
> field, but I do not know what is happening. Any clue?
>
> This is the pipeline that I am using, is there anything wrong in it?
> gst-launch-1.0 -v videotestsrc do-timestamp=true is-live=true ! x264enc !
> queue ! h264parse ! mpegtsmux ! udpsink host=10.192.33.136 port=2400 sync=1
>
> Thank you very much in advance.
>
> Best regards,
> Antonio.
>
>
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