[Cin] two patches for vframe.C and trackcanvas.C

[Phyllis Smith]

Checked into GIT 0001-cppcheck-in-trackcanvas.C.patch -- always a good idea
to initialize variables

> Tried both patches with no problems. No core dumps or error messages.
> Playback is similar to that with CinGG-appimage (without patches).
Andrea, I have attached small test file which crashes every time for me.
This is what I get with the attached test:

> audio0 pad 16 0 (16)
> FFMPEG::open_decoder: some stream times estimated:
> /root/media1/elephants-dream.webm
> FFMPEG::open_decoder: some stream times estimated:
> /root/media1/elephants-dream.webm
> cin: malloc.c:4036: _int_malloc: Assertion `(unsigned long) (size) >=
> (unsigned long) (nb)' failed.
> Aborted (core dumped)
>
Andrew, keep checking for potential other improvements out there because
you never know what you might find.

In the build system of CGG not all the actual dependencies on the C++ header
> files are defined. It is very likely that a simple `make all' after change
> in some .h header file will recompile some .C files and not recompile some
> other .C files which depend on the changed header.
>
...

> To test if it could be the case is easy: a complete fresh build with
> preceding clean-up of all the .o, .a, and .so files.
>
Thanks for the reminder because it makes a big difference.  Because I have
gotten bit by this so many times, I just routinely do "make clean" and then
run "bld.sh" that way I know I am testing what I think I am AND I get a
coffee break.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.cinelerra-gg.org/pipermail/cin/attachments/20220411/03910f39/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: test_vframe.webm.gz
Type: application/gzip
Size: 177208 bytes
Desc: not available
URL: <https://lists.cinelerra-gg.org/pipermail/cin/attachments/20220411/03910f39/attachment-0001.bin>