There is a stack buffer overflow in MP4Box 1.1.0 at src/filters/dmx_nhml.c in nhmldmx_init_parsing which leads to a denial of service vulnerability.
- [x] I looked for a similar issue and couldn't find any.
- [x] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [x] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). 

Step to reproduce:

1.get latest commit code (GPAC version 1.1.0-DEV-rev1221-gd626acad8-master)
2.compile with --enable-sanitizer
3.make 5 dirs which every of them has a large name(length=255), this makes the file's abs-path lengh larger than 1024, we called it large.nhml
4.run MP4Box -add {path to large.nhml} -new new.mp4
Env:
Ubunut 20.04 , clang 12.0.1

My cmd line an ASAN report
MP4Box -add ~/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/large.nhml -new new.mp4

ASAN report:
```
=336368==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffc4519e5a8 at pc 0x000000491bf8 bp 0x7ffc4519e030 sp 0x7ffc4519d7f0
WRITE of size 2564 at 0x7ffc4519e5a8 thread T0
    #0 0x491bf7 in __interceptor_strcpy (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x491bf7)
    #1 0x7f4bfc71ad1b in nhmldmx_init_parsing dmx_nhml.c
    #2 0x7f4bfc7161c1 in nhmldmx_process (/home/lly/pro/gpac_asan/bin/gcc/libgpac.so.10+0xfb91c1)
    #3 0x7f4bfc6454f7 in gf_filter_process_task filter.c
    #4 0x7f4bfc6275a5 in gf_fs_thread_proc filter_session.c
    #5 0x7f4bfc626aa0 in gf_fs_run (/home/lly/pro/gpac_asan/bin/gcc/libgpac.so.10+0xec9aa0)
    #6 0x7f4bfc150959 in gf_media_import (/home/lly/pro/gpac_asan/bin/gcc/libgpac.so.10+0x9f3959)
    #7 0x526c94 in import_file (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x526c94)
    #8 0x4eb8b6 in do_add_cat main.c
    #9 0x4e7c66 in mp4boxMain (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x4e7c66)
    #10 0x7f4bfb3d90b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
    #11 0x429a4d in _start (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x429a4d)

Address 0x7ffc4519e5a8 is located in stack of thread T0 at offset 1384 in frame
    #0 0x7f4bfc71a56f in nhmldmx_init_parsing dmx_nhml.c

  This frame has 141 object(s):

```

Maybe fix for issue 1908 dose not consider this situation that there is a stack buffer overflow in nhmldmx_init_parsing


Stack buffer overflow in MP4Box at src/filters/dmx_nhml.c in nhmldmx_init_parsing
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Stack buffer overflow in MP4Box at src/filters/dmx_nhml.c in nhmldmx_init_parsing
Issue date:

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- [x] I looked for a similar issue and couldn't find any.
- [x] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [x] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). 

Step to reproduce:

1.get latest commit code (GPAC version 1.1.0-DEV-rev1221-gd626acad8-master)
2.compile with --enable-sanitizer
3.make 5 dirs which every of them has a large name(length=255), this makes the file's abs-path lengh larger than 1024, we called it large.nhml
4.run MP4Box -add {path to large.nhml} -new new.mp4
Env:
Ubunut 20.04 , clang 12.0.1

My cmd line an ASAN report
MP4Box -add ~/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/12341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341231234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123/large.nhml -new new.mp4

ASAN report:
```
=336368==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffc4519e5a8 at pc 0x000000491bf8 bp 0x7ffc4519e030 sp 0x7ffc4519d7f0
WRITE of size 2564 at 0x7ffc4519e5a8 thread T0
    #0 0x491bf7 in __interceptor_strcpy (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x491bf7)
    #1 0x7f4bfc71ad1b in nhmldmx_init_parsing dmx_nhml.c
    #2 0x7f4bfc7161c1 in nhmldmx_process (/home/lly/pro/gpac_asan/bin/gcc/libgpac.so.10+0xfb91c1)
    #3 0x7f4bfc6454f7 in gf_filter_process_task filter.c
    #4 0x7f4bfc6275a5 in gf_fs_thread_proc filter_session.c
    #5 0x7f4bfc626aa0 in gf_fs_run (/home/lly/pro/gpac_asan/bin/gcc/libgpac.so.10+0xec9aa0)
    #6 0x7f4bfc150959 in gf_media_import (/home/lly/pro/gpac_asan/bin/gcc/libgpac.so.10+0x9f3959)
    #7 0x526c94 in import_file (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x526c94)
    #8 0x4eb8b6 in do_add_cat main.c
    #9 0x4e7c66 in mp4boxMain (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x4e7c66)
    #10 0x7f4bfb3d90b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
    #11 0x429a4d in _start (/home/lly/pro/gpac_asan/bin/gcc/MP4Box+0x429a4d)

Address 0x7ffc4519e5a8 is located in stack of thread T0 at offset 1384 in frame
    #0 0x7f4bfc71a56f in nhmldmx_init_parsing dmx_nhml.c

  This frame has 141 object(s):

```

Maybe fix for issue 1908 dose not consider this situation that there is a stack buffer overflow in nhmldmx_init_parsing


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