[Question] how to check v4l2 device deliver jpeg/image or not. about nnstreamer-example HOT 5 CLOSED

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gst-inspect-1.0 typefind

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@niklasjang

$ GST_DEBUG=4 gst-launch-1.0 filesrc location=~/Downloads/flower.jpg ! typefind ! fakesink

...omission...
0:00:00.012980978 32169 0x5564093471e0 INFO               GST_EVENT gstevent.c:814:gst_event_new_caps: creating caps event image/jpeg, width=(int)499, height=(int)340, sof-marker=(int)0
0:00:00.012995973 32169 0x5564093471e0 INFO                typefind gsttypefindelement.c:181:gst_type_find_element_have_type:<typefindelement0> found caps image/jpeg, width=(int)499, height=(int)340, sof-marker=(int)0, probability=100
0:00:00.013013514 32169 0x5564093471e0 INFO               GST_EVENT gstevent.c:895:gst_event_new_segment: creating segment event bytes segment start=0, offset=0, stop=-1, rate=1.000000, applied_rate=1.000000, flags=0x00, time=0, base=0, position 0, duration -1

...omission...

In the native code, you can simply attach a signal handler to the typefind handler to get possible caps.

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To change framerate, add videorate to your pipeline; then you'll get 10/1 framerate. (5.)

With jpegdec, it worked because it does not need to change framerate. It has created video (video/xraw) from images (jpeg) with the given framerate (10 or 30.

With decodebin , you are making video/xraw from video/xraw of decodebin, which requires you to change framerate.

ps. you'd better handle and tweak with queue and synchronization mechanisms than tweaking framerate of input. Your hardware may have different performance.

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It helps me a lot. Thank you very much.

I'm closing this.

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