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DamZiobro / MJPEGDecoder

Decode AVI file from MJPEG bitstream
GNU General Public License v2.0
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Not getting a functional avi file #1

Closed a52siddi closed 7 years ago

a52siddi commented 7 years ago

Hello.

After running the following command:

mjpegDecoder heli.mjpg giveme.avi

images for each of the frames were generated but only an empty .avi file (giveme.avi) was produced.

Running the command produced the following result on the command line:

Segmentation fault (core dumped)

When I open the avi file it just says "Stream contains no data". Why is the avi file empty?

Waiting eagerly for your response.

DamZiobro commented 7 years ago

Could you attach your heli.mjpg here and core file dumped while 'Segementation fault (core dumped)' is visible, please?

a52siddi commented 7 years ago

Thank you for the reply.

I have attached the file to this comment:

heli.zip

I had to zip the file because I cannot attach .mjpg files directly to comments on github.

I couldn't find the core file you asked about. Where can I find it? I am running the code on RHEL 6.6

Waiting eagerly for your response.

DamZiobro commented 7 years ago

core file is dumped in the dir where exec file is run from (in our case in the dir where mjpegDecoder is placed). However in order to unlock core file dumping you need to set core file limit to 'unlimited'. Use this command: ulimit -c unlimited

I was able to reproduce this issue and will provide fix soon

DamZiobro commented 7 years ago

One more tip for the future. If you will have core file dumped, you can run following command to get stack frames of all frames of the application in order to debug where the problem is:

echo "thread apply all bt" > commands && gdb -c core mjpegDecoder -x commands -batch

DamZiobro commented 7 years ago

Sorry for delay - forgot to do that earlier. I solved it today over lunch by this commit: https://github.com/xmementoit/MJPEGDecoder/commit/69105eed76b0076ab2ce2b5ac0b30e4fa4681a69