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 http://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: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

I use `gpac` reading `RTMP` input and serve them with ll-hls, the command is like:
```
gpac -i 'rtmp://:1935/live/abc:gpac:rtmp_listen=1' reframer:rt=on -o http://127.0.0.1:8080/ll-hls/live.m3u8:gpac:segdur=4:cdur=1:profile=live:dmode=dynamic:hmode=push:llhls=sf
``` 
Now I want to add some arguments which can transcode rtmp to different resolution streams and use ll-hls provide these streams so web player can choose one of them by estimated bandwidth, which is so called adaptive stream media. I have read documents and found nothing. I want to know whether `gpac` support this operation and how to change above command. 
Thank you.
can gpac transcode one rtmp input to several streams with different resolution and output them with one ll-hls? 
This is a GitHub Issue
repo:gpac
owner:gpac
Title : can gpac transcode one rtmp input to several streams with different resolution and output them with one ll-hls? 
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 http://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: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

I use `gpac` reading `RTMP` input and serve them with ll-hls, the command is like:
```
gpac -i 'rtmp://:1935/live/abc:gpac:rtmp_listen=1' reframer:rt=on -o http://127.0.0.1:8080/ll-hls/live.m3u8:gpac:segdur=4:cdur=1:profile=live:dmode=dynamic:hmode=push:llhls=sf
``` 
Now I want to add some arguments which can transcode rtmp to different resolution streams and use ll-hls provide these streams so web player can choose one of them by estimated bandwidth, which is so called adaptive stream media. I have read documents and found nothing. I want to know whether `gpac` support this operation and how to change above command. 
Thank you.
--- end body ---
