QtMultimedia 5.5 , mp4 playing crashes *** stack smashing detected ***

plc66

Hello,

I am trying to figure out why my app crashes with *** stack smashing detected *** when I try to play a mp4 file. avi file do work very well.

The code is very simple:

Video {
        id: video
        anchors.rightMargin: 0
        anchors.leftMargin: 0
        anchors.topMargin: 0
        anchors.bottomMargin: 0
        anchors.fill: parent
        source: "file:///home/pilou/OSVR_Projects/testMp4.mp4"
        autoPlay: true
    }

I am using Ubuntu 15.10 both on a laptop and a desktop , and I come across the same problem twice.

Checked all my packages etc, all seem OK.

Can anyone replicate ? Any idea ?

SGaist

Hi and welcome to devnet,

Does it happen with all .mp4 files ?

What version of Qt are you using ?

plc66

Hello SGaist,

Thanks for taking the time to reply.

Tried actually some of the other video examples and every time I have the same issue.
*** Stack smashing detected ***
Tried with various mp4s samples from different locations. Same error.
Also tried with other formats, avi works fine , mkv crashes, mpeg works fine ... hmmm ?
I can play the movies with VLC and the files are not corrupted. So I would appear to have the adequate codec pack installed.

Using Qt 5.5.0 gcc 64bit.

SGaist

Can you run your application through a debugger ?

That would allow to determine if its within Qt or the GStreamer plugin used.

plc66

Hello!
Running the app with valgrind, and seg fault 6.

==3317== Process terminating with default action of signal 6 (SIGABRT)
==3317== at 0x74A4267: raise (raise.c:55)
==3317== by 0x74A5EC9: abort (abort.c:89)
==3317== by 0x74E7BF2: __libc_message (libc_fatal.c:175)
==3317== by 0x7587E3B: __fortify_fail (fortify_fail.c:38)
==3317== by 0x7587DDF: __stack_chk_fail (stack_chk_fail.c:28)
==3317== by 0x2E3FE1C1: ??? (in /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstfaad.so)
==3317== by 0x207414EA: ??? (in /usr/lib/x86_64-linux-gnu/libgstaudio-0.10.so.0.25.0)
==3317== by 0x21478DFE: gst_pad_set_caps (in /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0.30.0)
==3317== by 0x2147ABCA: ??? (in /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0.30.0)
==3317== by 0x2147E627: gst_pad_push (in /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0.30.0)
==3317== by 0x211DC67F: gst_base_parse_push_frame (in /usr/lib/x86_64-linux-gnu/libgstbase-0.10.so.0.30.0)
==3317== by 0x211DDADF: ??? (in /usr/lib/x86_64-linux-gnu/libgstbase-0.10.so.0.30.0)
==3317== by 0x2147AB30: ??? (in /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0.30.0)
==3317== by 0x2147E627: gst_pad_push (in /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0.30.0)
==3317== by 0x24FEDABF: ??? (in /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstcoreelements.so)
==3317== by 0x214A3FB2: ??? (in /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0.30.0)
==3317== by 0xAE9A2FD: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4600.1)
==3317== by 0xAE99964: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4600.1)
==3317== by 0x83BE6A9: start_thread (pthread_create.c:333)
==3317== by 0x7575E9C: clone (clone.S:109)

Looks like it is gstreamer related.

SGaist

Strange, I thought Qt 5.5 was using GStreamer 1 by default

plc66

I came across the problem of gstreamer version , and it seems that Qt still uses the gstreamer 0.10... despite the port to 1.X being allegedly in the pipeline for a while.
I had to fiddle around with ppas to get some apps to compile fine with 15.10.
Still stuck with the same problem.

SGaist

The port is done, see here