ios hardware decoding

[Sebastian Dröge]

On Do, 2015-08-27 at 21:22 +0300, Dmitriy Nikolin wrote:
> Hello, 
> i try to use gsteamer for live streaming from raspberry to iPhone and 
> i get some problems. i want to use hardware decoding on iPhone and 
> what i get ( gstreamer 1.5.9, ios 8.4.1)
> 
> sender raspberry pipeline: raspivid -t 0 -w 1024 -h 576 -fps 30 -b 
> 3000000 -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay 
> config-interval=5 pt=96 mtu=1380 ! udpsink host=192.168.0.103 
> port=6000

Use rpicamsrc instead of this duct tape solution with raspivid :)
https://github.com/thaytan/gst-rpicamsrc


> receiver iphone pipeline : udpsrc port=6000 ! application/x-rtp, 
> payload=96 ! rtph264depay ! h264parse ! vtdec ! glimagesink

Can you successfully decode the stream with avdec_h264, on an iOS
device or any other system?

> gst_base_sink_is_too_late(GstBaseSink *, GstMiniObject *,
> GstClockTime, GstClockTime, GstClockReturn, GstClockTimeDiff, 
> gboolean):<sink>[00m warning: There may be a timestamping problem, or 
> this computer is too slow.
> 
> if i add glimagesink sync=false to ios pipeline i have no warnings 
> about buffer of timestamping problem but i get huge latency.

Can you check in a profiler if there are any CPU bottlenecks, and if so
where they are?

> but in both cases i get greenish image and warning :


Do you only get a solid green image or does it contain anything else?

>  0:00:12.215515000 [331m 2418[00m  0x48ed1c0 [33;01mWARN   [00m [00m  
>         video-info video-info.c:391:gboolean 
> gst_video_info_from_caps(GstVideoInfo *, const GstCaps *):[00m 
> invalid colorimetry, using default

This looks like a bug somewhere where caps are created, can you provide
a debug log so we can check where it comes from?

-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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