Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [x] I looked for a similar issue and couldn't find any.
- [x] I tried with the latest version of GPAC. Installers available at https://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 ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Download this Twitch video with [TwitchDownloaderCLI](https://github.com/lay295/TwitchDownloader):

```
TwitchDownloaderCLI videodownload -u 2065608792 -q best -o 2065608792.mp4
```

Try to split it

```
MP4Box -splitx 8130:9200 2065608792.mp4 -out mp4box.mp4
[MP4Mux] Error creating new tx3g sample description: Bad Parameter
Failed to connect filter reframer PID T3 to filter mp4mx: Bad Parameter
splitting: file 1 done
Split failed: Bad Parameter

	Error: Bad Parameter
```

2065608792.mp4 includes 4 chapters, I guess they should be adjusted relative to output file as well (in case it's not done already).
Here is the attachment of these 2 output files (samples):

```
TwitchDownloaderCLI videodownload -u 2065608792 -q 480p -e 16 -o 2065608792_0s_16s.mp4
MP4Box -splitx 8:12 2065608792_0s_16s.mp4 -out mp4box_clip.mp4
```
[2065608792_0s_16s.zip](https://github.com/gpac/gpac/files/14627207/2065608792_0s_16s.zip)

Can't split MP4 files downloaded from Twitch Transport Stream files
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Can't split MP4 files downloaded from Twitch Transport Stream files
Issue date:

--- start body ---
Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [x] I looked for a similar issue and couldn't find any.
- [x] I tried with the latest version of GPAC. Installers available at https://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 ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Download this Twitch video with [TwitchDownloaderCLI](https://github.com/lay295/TwitchDownloader):

```
TwitchDownloaderCLI videodownload -u 2065608792 -q best -o 2065608792.mp4
```

Try to split it

```
MP4Box -splitx 8130:9200 2065608792.mp4 -out mp4box.mp4
[MP4Mux] Error creating new tx3g sample description: Bad Parameter
Failed to connect filter reframer PID T3 to filter mp4mx: Bad Parameter
splitting: file 1 done
Split failed: Bad Parameter

	Error: Bad Parameter
```

2065608792.mp4 includes 4 chapters, I guess they should be adjusted relative to output file as well (in case it's not done already).
Here is the attachment of these 2 output files (samples):

```
TwitchDownloaderCLI videodownload -u 2065608792 -q 480p -e 16 -o 2065608792_0s_16s.mp4
MP4Box -splitx 8:12 2065608792_0s_16s.mp4 -out mp4box_clip.mp4
```
[2065608792_0s_16s.zip](https://github.com/gpac/gpac/files/14627207/2065608792_0s_16s.zip)

--- end body ---
