Segmentation fault during render from Kdenlive

**Describe the bug**
Segmentation fault during rendering.

[gdb session](https://github.com/user-attachments/files/24946101/gdb.txt)
or maybe this is the actual backtrace, I’m not too familiar with debugging these
```
Current Position:          0
Thread 46 "melt" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff92fdc6c0 (LWP 10072)]
qt_memfillXX_avx2 (dest=0x7ffe3292df30 "", value256=..., bytes=8294400)
    at /usr/src/debug/qt6-base/qtbase/src/gui/painting/qdrawhelper_avx2.cpp:294
294             _mm256_storeu_si256(dst256 + 2, value256);
(gdb) bt
#0  qt_memfillXX_avx2 (dest=0x7ffe3292df30 "", value256=..., bytes=8294400)
    at /usr/src/debug/qt6-base/qtbase/src/gui/painting/qdrawhelper_avx2.cpp:294
#1  0x00007fffdbb37d15 in filter_get_image(mlt_frame_s*, unsigned char**, mlt_image_format*, int*, int*, int) () from /usr/local/lib/mlt-7/libmltqt6.so
#2  0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff728ae5a0, buffer=0x7fff92fd9d18, 
    format=0x555555b9924c, width=0x7fff92fd9ce4, height=0x7fff92fd9ce8, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#3  0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff72558c60, buffer=0x7fff92fd9d18, 
    format=0x555555b9924c, width=0x7fff92fd9ce4, height=0x7fff92fd9ce8, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#4  0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff72558c60, buffer=0x7fff92fd9d18, 
    format=0x555555b9924c, width=0x7fff92fd9ce4, height=0x7fff92fd9ce8, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#5  0x00007ffff7faa16d in get_image_b (b_frame=0x7fff72558c60, image=0x7fff92fd9d18, 
    format=0x555555b9924c, width=0x7fff92fd9ce4, height=0x7fff92fd9ce8, writable=0)
    at /home/jp/mlt/src/framework/mlt_transition.c:379
#6  0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff72558c60, buffer=0x7fff92fd9d18, 
    format=0x555555b9924c, width=0x7fff92fd9ce4, height=0x7fff92fd9ce8, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#7  0x00007fffdbb679c4 in get_image(mlt_frame_s*, unsigned char**, mlt_image_format*, int*, int*, int) () from /usr/local/lib/mlt-7/libmltqt6.so
#8  0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff72965a60, buffer=0x7fff92fda0e0, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#9  0x00007ffff7faa007 in get_image_a (a_frame=0x7fff72965a60, image=0x7fff92fda0e0, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_transition.c:348
#10 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff72965a60, buffer=0x7fff92fda0e0, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#11 0x00007fffdbb67f03 in get_image(mlt_frame_s*, unsigned char**, mlt_image_format*, int*, int*, int) () from /usr/local/lib/mlt-7/libmltqt6.so
#12 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff72965a60, buffer=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#13 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff7295e220, buffer=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#14 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff7295e220, buffer=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#15 0x00007fffdc1de6f3 in filter_get_image () from /usr/local/lib/mlt-7/libmltplus.so
#16 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff7295e220, buffer=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#17 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff730c33a0, buffer=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#18 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff730c33a0, buffer=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#19 0x00007ffff7faa16d in get_image_b (b_frame=0x7fff730c33a0, image=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_transition.c:379
#20 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff730c33a0, buffer=0x7fff92fdab88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#21 0x00007ffff7f51c0f in transition_get_image () from /usr/local/lib/mlt-7/libmltfrei0r.so
#22 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff4c053660, buffer=0x7fff92fdad88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#23 0x00007ffff7faa16d in get_image_b (b_frame=0x7fff4c053660, image=0x7fff92fdad88, 
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_transition.c:379
#24 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff4c053660, buffer=0x7fff92fdad88, 
--Type <RET> for more, q to quit, c to continue without paging--c
    format=0x555555b9924c, width=0x7fff92fdad54, height=0x7fff92fdad58, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#25 0x00007fffdbb679c4 in get_image(mlt_frame_s*, unsigned char**, mlt_image_format*, int*, int*, int) () from /usr/local/lib/mlt-7/libmltqt6.so
#26 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff4ee675e0, buffer=0x7fff92fdb318, 
    format=0x555555b9924c, width=0x7fff92fdb2e4, height=0x7fff92fdb2e8, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#27 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff72631cb0, buffer=0x7fff92fdb318, 
    format=0x555555b9924c, width=0x7fff92fdb2e4, height=0x7fff92fdb2e8, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#28 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff72631cb0, buffer=0x7fff92fdb318, 
    format=0x555555b9924c, width=0x7fff92fdb2e4, height=0x7fff92fdb2e8, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#29 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff73da7e20, buffer=0x7fff92fdb318, 
    format=0x555555b9924c, width=0x7fff92fdb2e4, height=0x7fff92fdb2e8, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#30 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff73da7e20, buffer=0x7fff92fdb318, 
    format=0x555555b9924c, width=0x7fff92fdb2e4, height=0x7fff92fdb2e8, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#31 0x00007ffff7faa16d in get_image_b (b_frame=0x7fff73da7e20, image=0x7fff92fdb318, 
    format=0x555555b9924c, width=0x7fff92fdb2e4, height=0x7fff92fdb2e8, writable=0)
    at /home/jp/mlt/src/framework/mlt_transition.c:379
#32 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff73da7e20, buffer=0x7fff92fdb318, 
    format=0x555555b9924c, width=0x7fff92fdb2e4, height=0x7fff92fdb2e8, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#33 0x00007fffdbb679c4 in get_image(mlt_frame_s*, unsigned char**, mlt_image_format*, int*, int*, int) () from /usr/local/lib/mlt-7/libmltqt6.so
#34 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff8c005300, buffer=0x7fff92fdb8a8, 
    format=0x555555b9924c, width=0x7fff92fdb874, height=0x7fff92fdb878, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#35 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff8c004590, buffer=0x7fff92fdb8a8, 
    format=0x555555b9924c, width=0x7fff92fdb874, height=0x7fff92fdb878, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#36 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff8c004590, buffer=0x7fff92fdb8a8, 
    format=0x555555b9924c, width=0x7fff92fdb874, height=0x7fff92fdb878, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#37 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff8c003790, buffer=0x7fff92fdb8a8, 
    format=0x555555b9924c, width=0x7fff92fdb874, height=0x7fff92fdb878, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#38 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff8c003790, buffer=0x7fff92fdb8a8, 
    format=0x555555b9924c, width=0x7fff92fdb874, height=0x7fff92fdb878, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#39 0x00007ffff7faa16d in get_image_b (b_frame=0x7fff8c003790, image=0x7fff92fdb8a8, 
    format=0x555555b9924c, width=0x7fff92fdb874, height=0x7fff92fdb878, writable=0)
    at /home/jp/mlt/src/framework/mlt_transition.c:379
#40 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff8c003790, buffer=0x7fff92fdb8a8, 
    format=0x555555b9924c, width=0x7fff92fdb874, height=0x7fff92fdb878, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#41 0x00007fffdbb679c4 in get_image(mlt_frame_s*, unsigned char**, mlt_image_format*, int*, int*, int) () from /usr/local/lib/mlt-7/libmltqt6.so
#42 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff4ede4b20, buffer=0x7fff92fdbe18, 
    format=0x555555b9924c, width=0x7fff92fdbdb0, height=0x7fff92fdbdb4, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#43 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff8c0028a0, buffer=0x7fff92fdbe18, 
    format=0x555555b9924c, width=0x7fff92fdbdb0, height=0x7fff92fdbdb4, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#44 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff8c0028a0, buffer=0x7fff92fdbe18, 
    format=0x555555b9924c, width=0x7fff92fdbdb0, height=0x7fff92fdbdb4, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#45 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff8c001aa0, buffer=0x7fff92fdbe18, 
    format=0x555555b9924c, width=0x7fff92fdbdb0, height=0x7fff92fdbdb4, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#46 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff8c001aa0, buffer=0x7fff92fdbe18, 
    format=0x555555b9924c, width=0x7fff92fdbdb0, height=0x7fff92fdbdb4, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#47 0x00007ffff7fa8bc3 in producer_get_image (self=0x7fff8c000c10, buffer=0x7fff92fdbe18, 
    format=0x555555b9924c, width=0x7fff92fdbdb0, height=0x7fff92fdbdb4, writable=0)
    at /home/jp/mlt/src/framework/mlt_tractor.c:376
#48 0x00007ffff7f88d21 in mlt_frame_get_image (self=0x7fff8c000c10, buffer=0x7fff92fdbe18, 
    format=0x555555b9924c, width=0x7fff92fdbdb0, height=0x7fff92fdbdb4, writable=0)
    at /home/jp/mlt/src/framework/mlt_frame.c:515
#49 0x00007ffff7f824fc in consumer_read_ahead_thread (arg=0x555555ce4850)
    at /home/jp/mlt/src/framework/mlt_consumer.c:844
#50 0x00007ffff7c9698b in ?? () from /usr/lib/libc.so.6
#51 0x00007ffff7d1a9cc in ?? () from /usr/lib/libc.so.6
```

**To Reproduce**
Seems to happen only with enough tracks and nested sequences, irrespective of the encoding settings; I can’t pinpoint the exact cause. Tell me if sending the Kdenlive project (or .mlt file and sources or something) would be useful.

**Expected behavior**
...

**Desktop (please complete the following information):**
 - OS: 6.18.4-1-MANJARO
- MLT/melt version: occurred with both v7.36.1 and aadad0a7037ebc7a6eca32c6fd30de6a03c336e3


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Segmentation fault during render from Kdenlive #1200

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Segmentation fault during render from Kdenlive #1200

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