v4l2h264dec Raspberry PI

[horai]

Ok, if I understand correctly. You want me to run this pipeline in GDB, ok?
gst-launch-1.0 -e filesrc location=/home/pi/jellyfish-3-mbps-hd-h264.mkv !
matroskademux ! h264parse ! v4l2h264dec capture-io-mode=4 ! v4l2convert
output-io-mode=5 capture-io-mode=4 ! video/x-raw,format=BGRA !
clutterautovideosink

I ran:
gdb gst-launch-1.0
and then:
run -e filesrc location=/home/pi/jellyfish-3-mbps-hd-h264.mkv !
matroskademux ! h264parse ! v4l2h264dec capture-io-mode=4 ! v4l2convert
output-io-mode=5 capture-io-mode=4 ! video/x-raw,format=BGRA !
clutterautovideosink
>From other command line I sent the STOP signal:
kill --signal STOP 15873
after the first warrning appeared I ran:
bt
result this:
#0  0x76bf0120 in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x754000f4 in ?? () from /usr/lib/arm-linux-gnueabihf/libxcb.so.1

I don't think this is what you want, sorry to ask like an idiot, but all
this work is just my hobby and I am not a professional, could you point me
how to get exactly what you want?

Anyway, what dma-buf concerns I build Gstreamer 1.16 myself.
I am missing this during the base plugins build
:checking for mmap... yes
checking linux/dma-buf.h usability... no
checking linux/dma-buf.h presence... no
checking for linux/dma-buf.h... no

I have a testing kernel 4.19.* but I cannot obtain headers easily (this
kernel is not in repository therefore no headers present). I downloaded the
entire appropriate kernel source code but command:
make headers_install
does not install headers to proper directory, moreover exporting header path
where dma-buf.h is (for ./autogen.sh:
export
CPPFLAGS="-I/home/pi/linux-2f5a6b906ad86ef6570863a75b204551c2c62fec/include/linux
-I/home/pi/linux-2f5a6b906ad86ef6570863a75b204551c2c62fec/include/uapi/linux"
Does not help either









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