## Description
There is a segment fault detected by AddressSanitizer

## System info
```
Ubuntu 20.04.2 LTS
clang version 12.0.0-++20210402082642+04ba60cfe598-1~exp1~20210402063359.71
MP4Box - GPAC version 1.1.0-DEV-rev1705-gc3ed3094a-master
```

## Build command
```
./configure --static-mp4box --prefix=`realpath ./install` --enable-sanitizer --cc=clang --cxx=clang++
```

## crash command
```
MP4Box -isma -out /dev/null poc_file
```

## Pocs
[poc.zip](https://github.com/gpac/gpac/files/8000909/poc.zip)


## Crash output
```
==3234==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000028 (pc 0x0000008a27ee bp 0x7ffe76cfa230 sp 0x7ffe76cfa0a0 T0)
==3234==The signal is caused by a READ memory access.
==3234==Hint: address points to the zero page.
    #0 0x8a27ee in Track_SetStreamDescriptor /programs/mp4box/builds/build8/src/isomedia/track.c:1506:52
    #1 0x8141f5 in gf_isom_change_mpeg4_description /programs/mp4box/builds/build8/src/isomedia/isom_write.c:1654:6
    #2 0x8fa401 in gf_media_make_isma /programs/mp4box/builds/build8/src/media_tools/isom_tools.c:604:13
    #3 0x4e4934 in mp4boxMain /programs/mp4box/builds/build8/applications/mp4box/main.c:6332:8
    #4 0x7f0a8deca0b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #5 0x41ea6d in _start (/programs/mp4box/builds/build8/bin/gcc/MP4Box+0x41ea6d)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /programs/mp4box/builds/build8/src/isomedia/track.c:1506:52 in Track_SetStreamDescriptor
==3234==ABORTING
```
There is a segment fault detected by AddressSanitizer
This is a GitHub Issue
repo:gpac
owner:gpac
Title : There is a segment fault detected by AddressSanitizer
Issue date:

--- start body ---
## Description
There is a segment fault detected by AddressSanitizer

## System info
```
Ubuntu 20.04.2 LTS
clang version 12.0.0-++20210402082642+04ba60cfe598-1~exp1~20210402063359.71
MP4Box - GPAC version 1.1.0-DEV-rev1705-gc3ed3094a-master
```

## Build command
```
./configure --static-mp4box --prefix=`realpath ./install` --enable-sanitizer --cc=clang --cxx=clang++
```

## crash command
```
MP4Box -isma -out /dev/null poc_file
```

## Pocs
[poc.zip](https://github.com/gpac/gpac/files/8000909/poc.zip)


## Crash output
```
==3234==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000028 (pc 0x0000008a27ee bp 0x7ffe76cfa230 sp 0x7ffe76cfa0a0 T0)
==3234==The signal is caused by a READ memory access.
==3234==Hint: address points to the zero page.
    #0 0x8a27ee in Track_SetStreamDescriptor /programs/mp4box/builds/build8/src/isomedia/track.c:1506:52
    #1 0x8141f5 in gf_isom_change_mpeg4_description /programs/mp4box/builds/build8/src/isomedia/isom_write.c:1654:6
    #2 0x8fa401 in gf_media_make_isma /programs/mp4box/builds/build8/src/media_tools/isom_tools.c:604:13
    #3 0x4e4934 in mp4boxMain /programs/mp4box/builds/build8/applications/mp4box/main.c:6332:8
    #4 0x7f0a8deca0b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #5 0x41ea6d in _start (/programs/mp4box/builds/build8/bin/gcc/MP4Box+0x41ea6d)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /programs/mp4box/builds/build8/src/isomedia/track.c:1506:52 in Track_SetStreamDescriptor
==3234==ABORTING
```
--- end body ---
