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mltframework / mlt-scripts

scripts to help build open source MLT apps
https://www.mltframework.org
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frei0r emboss seg fault melt #19

Closed ydesgagn closed 6 years ago

ydesgagn commented 7 years ago

Hi,

We are using build-melt.sh v21 to build melt with all libraries. We discovered that when using frei0r emboss effect, melt will do a segmentation fault. With gdb, we clearly see it in in the emboss plugin.

So we went further and discovered that if using the same environment variables and commands that the script was using we can make it work.

The script set CFLAGS=. In such case emboss crash.

If we use the same commands but unset CFLAGS instead emboss will work fine.

Any clue?

ddennedy commented 7 years ago

There is no "set CFLAGS=." in this script: https://github.com/mltframework/mlt-scripts/blob/master/build/build-melt.sh

There is "export CFLAGS=" on line 86. Did you comment that out? If you did, what is the environment variable "CFLAGS" set to when you run build-melt.sh (not in the script, but in the shell or parent process that runs build-melt.sh)?

ydesgagn commented 7 years ago

I know, I meant export. CFLAGS is unset in my shell. The fix I did so far is to add a line before line 1113 to unset CFLAGS. But I still cannot explain why an empty CFLAGS can cause emboss to crash and not an unset CFLAGS.

ydesgagn commented 6 years ago

Closing. The unset CFLAGS change is working well for us in both kdenlive and melt scripts.