gst equivalent off ffmpeg pkt_size for udpsink

[vanderhoffer]

Hi All,

Using the pipeline i C below, I have some packets moving between gstremer and a media server(or ffmpeg) on a different machine, however when I ffprobe I get the error.

[h264 @ 0x18514e0] decode_slice_header error
[h264 @ 0x18514e0] no frame!
[h264 @ 0x18514e0] non-existing PPS 0 referenced
    Last message repeated 1 times


Using ffmpeg to send with the following works fine,
-vcodec libx264  -vb 150000 -g 60 -vprofile baseline -level 2.1 \
-acodec aac -ab 64000 -ar 48000 -ac 2 -vbsf h264_mp4toannexb -strict experimental \
-f mpegts udp://10.0.10.237:10000?pkt_size=1316

my pipeline is

elem_1 = gst_element_factory_make ("x264enc", elem_name);
elem_3 = gst_element_factory_make ("capsfilter", elem_name);
 g_object_set( G_OBJECT ( elem_5 ),  "caps",  elem_5_caps, NULL ); // w,h,fr
elem_5 = gst_element_factory_make ("mpegtsmux", elem_name);
 //g_object_set( G_OBJECT ( elem_5 ),  "alignment",  "7", NULL ); // Did not work, blocked pipeline
elem_7 = gst_element_factory_make ("udpsink", elm_name);
g_object_set( G_OBJECT ( elem_7 ),  "caps",  "application/x-rtp", NULL );

Do I need to add something like rndbuffersize or rtpL16pay mtu=1316 to the pipeline?

where would I add these, between 5 & 7 or 3 & 5

thx
Art

[Tim Müller]

On Tue, 2017-01-10 at 08:36 -0800, vanderhoffer wrote:

> elem_5 = gst_element_factory_make ("mpegtsmux", elem_name);
>  //g_object_set( G_OBJECT ( elem_5 ),  "alignment",  "7", NULL ); //
> Did not work, blocked pipeline

Tried g_object_set(elem_5, "alignment", 7, NULL );  ? (no quotes)

Cheers
 -Tim
--
Tim Müller, Centricular Ltd - http://www.centricular.com
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[Baby Octopus]

I'm not sure if alignment property of mpegtsmux is functional. You can also try rndbuffersize min=max=1316

[vanderhoffer]

Good catch Tim, the no quotes unblocked but did not help with the packet size

Thx
Art

[vanderhoffer]

@Baby Octopus,

I added that element with

g_object_set( G_OBJECT ( myRndbuffersize  ),  "min",  1316, NULL );
g_object_set( G_OBJECT ( myRndbuffersize ),  "max",  1316, NULL );

But I still get a weird stream start with some green tearing on the bottom half of the player for the first few seconds.

ffprobe on same box reports
    Last message repeated 1 times
[h264 @ 0x6f04e0] decode_slice_header error
[h264 @ 0x6f04e0] non-existing PPS 0 referenced
[h264 @ 0x6f04e0] decode_slice_header error
[h264 @ 0x6f04e0] no frame!
[h264 @ 0x6f04e0] non-existing PPS 0 referenced
[mpegts @ 0x6cdda0] decoding for stream 0 failed
[mpegts @ 0x6cdda0] Could not find codec parameters for stream 0 (Video: h264 (HDMV / 0x564D4448), none): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options


 I will run a packet trace to see if packet sizes are actually 1316, but this does not happen with ffmpeg. It is solid from first frame


Thx
Art

[Tim Müller]

On Tue, 2017-01-10 at 13:58 -0800, vanderhoffer wrote:

> Good catch Tim, the no quotes unblocked but did not help with the
> packet size

What's the output of

  gst-inspect-1.0 mpegtsmux | grep Version

for you? There were some bug fixes at some point.

Cheers
 -Tim

--
Tim Müller, Centricular Ltd - http://www.centricular.com
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[vanderhoffer]

Hey Tim

Ver = 1.11.01

as per
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-plugin-mpegtsmux.html

it shows
filename
libgstmpegtsmux.so
version
1.10.1

so it seems the docs are not updated yet. Is there a way to see the version through GIT?