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

Detailed guidelines: https://gpac.io/bug-reporting/

I have a question video audio sync.  
when I try play hls-js, video-audio sync is  out of sync.  

My question is that is there possible to Performance improvement to make segment faster ? 
(Now I am collecting data in segments in 2 sec)   
when i make audio segments it takes about 1.97 seconds (from first audio data to callback),   
video takes 1.98 seconds (from first video data to callback).  
Could this have something to do with the out of sync?  
(Also I am trying to use compress mode using `gf_isom_enable_compression` when I mux the video, Is it good choice ?)  

Seconds question is   
when i use `gf_isom_fragment_add_sample` this function  
https://github.com/gpac/gpac/blob/96b474ec59b3490eed7a874b14f78ad4b3a9d2bd/src/isomedia/movie_fragments.c#L2979C1-L2980C113  
If I push the video I-frame for sample,  
do I set the argument redundant_coding = 0,  
otherwise, P-frame or B-frame, set redundant_coding = 1 ?   
video-audio sync question.
This is a GitHub Issue
repo:gpac
owner:gpac
Title : video-audio sync question.
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

Detailed guidelines: https://gpac.io/bug-reporting/

I have a question video audio sync.  
when I try play hls-js, video-audio sync is  out of sync.  

My question is that is there possible to Performance improvement to make segment faster ? 
(Now I am collecting data in segments in 2 sec)   
when i make audio segments it takes about 1.97 seconds (from first audio data to callback),   
video takes 1.98 seconds (from first video data to callback).  
Could this have something to do with the out of sync?  
(Also I am trying to use compress mode using `gf_isom_enable_compression` when I mux the video, Is it good choice ?)  

Seconds question is   
when i use `gf_isom_fragment_add_sample` this function  
https://github.com/gpac/gpac/blob/96b474ec59b3490eed7a874b14f78ad4b3a9d2bd/src/isomedia/movie_fragments.c#L2979C1-L2980C113  
If I push the video I-frame for sample,  
do I set the argument redundant_coding = 0,  
otherwise, P-frame or B-frame, set redundant_coding = 1 ?   
--- end body ---
