Hi, developers of Bento4:
I also test the binary **mp4audioclip** instrumented with ASAN.  There are two input incuring two different function call stack of SEGV error. The information is as follows:

For 
https://github.com/Yhcrown/fuzzing-crashes/blob/main/validated/mp4audioclip/0:
```
AddressSanitizer:DEADLYSIGNAL
=================================================================
==4241==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x556421b987bc bp 0x7ffd605fbf60 sp 0x7ffd605fbe28 T0)
==4241==The signal is caused by a READ memory access.
==4241==Hint: address points to the zero page.
    #0 0x556421b987bc in AP4_Track::GetSampleIndexForTimeStampMs(unsigned int, unsigned int&) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x227bc)
    #1 0x556421b93f27 in main (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1df27)
    #2 0x7fd0a09a8d8f  (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
    #3 0x7fd0a09a8e3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e3f)
    #4 0x556421b94544 in _start (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1e544)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x227bc) in AP4_Track::GetSampleIndexForTimeStampMs(unsigned int, unsigned int&)
==4241==ABORTING
```
For 
https://github.com/Yhcrown/fuzzing-crashes/blob/main/validated/mp4audioclip/4
```
==3902==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x557efa43c2ce bp 0x000000000000 sp 0x7ffe91f96d90 T0)
==3902==The signal is caused by a READ memory access.
==3902==Hint: address points to the zero page.
    #0 0x557efa43c2ce in AP4_StsdAtom::AP4_StsdAtom(AP4_SampleTable*) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x602ce)
    #1 0x557efa438079 in AP4_SampleTable::GenerateStblAtom(AP4_ContainerAtom*&) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x5c079)
    #2 0x557efa3fec70 in AP4_TrakAtom::AP4_TrakAtom(AP4_SampleTable*, unsigned int, char const*, unsigned int, unsigned long long, unsigned long long, unsigned long long, unsigned int, unsigned long long, unsigned short, char const*, unsigned int, unsigned int, unsigned short, unsigned short, int const*) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x22c70)
    #3 0x557efa3fdcc7 in AP4_Track::AP4_Track(AP4_Track::Type, AP4_SampleTable*, unsigned int, unsigned int, unsigned long long, unsigned int, unsigned long long, char const*, unsigned int, unsigned int, unsigned long long, unsigned long long) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x21cc7)
    #4 0x557efa3fa0a0 in main (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1e0a0)
    #5 0x7f921535ed8f  (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
    #6 0x7f921535ee3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e3f)
    #7 0x557efa3fa544 in _start (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1e544)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x602ce) in AP4_StsdAtom::AP4_StsdAtom(AP4_SampleTable*)
==3902==ABORTING
```

### Verification steps：

```
git clone https://github.com/axiomatic-systems/Bento4
cd Bento4/
mkdir check_build && cd check_build
cmake ../ -DCMAKE_C_COMPILER=clang  -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_FLAGS="-fsanitize=address" -DCMAKE_CXX_FLAGS="-fsanitize=address" -DCMAKE_BUILD_TYPE=Release
make -j 
./mp4audioclip ./crash_input
```
enviroment:
Ubuntu 22.04 LTS
Linux lab-pro 4.15.0-147-generic
gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0
Ubuntu clang version 14.0.6

**Thanks & Best regards !**
SEGV with ASAN in mp4audioclip
This is a GitHub Issue
repo:Bento4
owner:axiomatic-systems
Title : SEGV with ASAN in mp4audioclip
Issue date:

--- start body ---
Hi, developers of Bento4:
I also test the binary **mp4audioclip** instrumented with ASAN.  There are two input incuring two different function call stack of SEGV error. The information is as follows:

For 
https://github.com/Yhcrown/fuzzing-crashes/blob/main/validated/mp4audioclip/0:
```
AddressSanitizer:DEADLYSIGNAL
=================================================================
==4241==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x556421b987bc bp 0x7ffd605fbf60 sp 0x7ffd605fbe28 T0)
==4241==The signal is caused by a READ memory access.
==4241==Hint: address points to the zero page.
    #0 0x556421b987bc in AP4_Track::GetSampleIndexForTimeStampMs(unsigned int, unsigned int&) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x227bc)
    #1 0x556421b93f27 in main (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1df27)
    #2 0x7fd0a09a8d8f  (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
    #3 0x7fd0a09a8e3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e3f)
    #4 0x556421b94544 in _start (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1e544)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x227bc) in AP4_Track::GetSampleIndexForTimeStampMs(unsigned int, unsigned int&)
==4241==ABORTING
```
For 
https://github.com/Yhcrown/fuzzing-crashes/blob/main/validated/mp4audioclip/4
```
==3902==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x557efa43c2ce bp 0x000000000000 sp 0x7ffe91f96d90 T0)
==3902==The signal is caused by a READ memory access.
==3902==Hint: address points to the zero page.
    #0 0x557efa43c2ce in AP4_StsdAtom::AP4_StsdAtom(AP4_SampleTable*) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x602ce)
    #1 0x557efa438079 in AP4_SampleTable::GenerateStblAtom(AP4_ContainerAtom*&) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x5c079)
    #2 0x557efa3fec70 in AP4_TrakAtom::AP4_TrakAtom(AP4_SampleTable*, unsigned int, char const*, unsigned int, unsigned long long, unsigned long long, unsigned long long, unsigned int, unsigned long long, unsigned short, char const*, unsigned int, unsigned int, unsigned short, unsigned short, int const*) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x22c70)
    #3 0x557efa3fdcc7 in AP4_Track::AP4_Track(AP4_Track::Type, AP4_SampleTable*, unsigned int, unsigned int, unsigned long long, unsigned int, unsigned long long, char const*, unsigned int, unsigned int, unsigned long long, unsigned long long) (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x21cc7)
    #4 0x557efa3fa0a0 in main (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1e0a0)
    #5 0x7f921535ed8f  (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
    #6 0x7f921535ee3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e3f)
    #7 0x557efa3fa544 in _start (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x1e544)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/workspace/test/validate/Bento4/cmakebuild/mp4audioclip+0x602ce) in AP4_StsdAtom::AP4_StsdAtom(AP4_SampleTable*)
==3902==ABORTING
```

### Verification steps：

```
git clone https://github.com/axiomatic-systems/Bento4
cd Bento4/
mkdir check_build && cd check_build
cmake ../ -DCMAKE_C_COMPILER=clang  -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_FLAGS="-fsanitize=address" -DCMAKE_CXX_FLAGS="-fsanitize=address" -DCMAKE_BUILD_TYPE=Release
make -j 
./mp4audioclip ./crash_input
```
enviroment:
Ubuntu 22.04 LTS
Linux lab-pro 4.15.0-147-generic
gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0
Ubuntu clang version 14.0.6

**Thanks & Best regards !**
--- end body ---

The issue in the mp4audioclip component of Bento4 allows for a segmentation fault (SEGV) when processing certain inputs, which can lead to a Denial of Service (DoS). The AddressSanitizer reports a read memory access violation, indicating that the program attempts to read from a null pointer, which is a critical vulnerability that can be exploited.