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

We created a subtitles [WebVTT file](https://github.com/gpac/gpac/files/14889478/subtitleVTT.txt), and transformed it to a TTXT file using the following GPAC command:

```
gpac -i subtitleVTT.vtt -o subtitleTTXT.ttxt
```

After, we want to ingest an [output.ts](https://github.com/gpac/gpac/files/14889487/output.txt) file alongside the [subtitleTTXT.ttxt](https://github.com/gpac/gpac/files/14889485/subtitleTTXT.txt) file to produce HLS with WebVTT raw subtitles, using the following command:

```
gpac  \
  -i output.ts \
  -i subtitleTTXT.ttxt tx3g2vtt \
  -o res/live.m3u8:cmaf=cmf2:rawsub=true:segdur=1:cat=auto
```

Note the `tx3g2vtt` filter, who should transform the TTXT format to WebVTT format. GPAC throws the following error:

```
[Dasher] PID subtitleTTXT.ttxt config changed during active period, forcing period switch
Segmentation fault (core dumped)
```

Are we missing any configuration on the GPAC command to get this working? Any help is much appreciated.

The following are the attachments to run the GPAC command:

- [output.ts](https://github.com/gpac/gpac/files/14889487/output.txt): Rename to output.ts
- [subtitleVTT.vtt](https://github.com/gpac/gpac/files/14889478/subtitleVTT.txt): Rename to subtitleVTT.vtt
- [subtitleTTXT.ttxt](https://github.com/gpac/gpac/files/14889485/subtitleTTXT.txt): Rename to subtitleTTXT.ttxt


Ingesting TS and TTXT subtitle files to create HLS with WebVTT raw format seems not working
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Ingesting TS and TTXT subtitle files to create HLS with WebVTT raw format seems not working
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

We created a subtitles [WebVTT file](https://github.com/gpac/gpac/files/14889478/subtitleVTT.txt), and transformed it to a TTXT file using the following GPAC command:

```
gpac -i subtitleVTT.vtt -o subtitleTTXT.ttxt
```

After, we want to ingest an [output.ts](https://github.com/gpac/gpac/files/14889487/output.txt) file alongside the [subtitleTTXT.ttxt](https://github.com/gpac/gpac/files/14889485/subtitleTTXT.txt) file to produce HLS with WebVTT raw subtitles, using the following command:

```
gpac  \
  -i output.ts \
  -i subtitleTTXT.ttxt tx3g2vtt \
  -o res/live.m3u8:cmaf=cmf2:rawsub=true:segdur=1:cat=auto
```

Note the `tx3g2vtt` filter, who should transform the TTXT format to WebVTT format. GPAC throws the following error:

```
[Dasher] PID subtitleTTXT.ttxt config changed during active period, forcing period switch
Segmentation fault (core dumped)
```

Are we missing any configuration on the GPAC command to get this working? Any help is much appreciated.

The following are the attachments to run the GPAC command:

- [output.ts](https://github.com/gpac/gpac/files/14889487/output.txt): Rename to output.ts
- [subtitleVTT.vtt](https://github.com/gpac/gpac/files/14889478/subtitleVTT.txt): Rename to subtitleVTT.vtt
- [subtitleTTXT.ttxt](https://github.com/gpac/gpac/files/14889485/subtitleTTXT.txt): Rename to subtitleTTXT.ttxt


--- end body ---
