Hello, everyone. Is there any method to obtain the frame data of the hevc tiled video?
When i use MP4Box to produce DASH video from a single MP4 file, I can simply concatenate the init.mp4 and the .m4s files like this:
```
cat init.mp4 1.m4s 2.m4s 3.m4s > target.mp4
```
Then i can use other tools to obtain the frame data of the video.
However, if i produce a tiled DASH video according to the wiki "HEVC Tile based adaptation guide", i find that the method i used no longer works. 
When i want to concatenate the DASH files of one of the tracks (3x3+1 in wiki), the output can not be played seperately which means i can not obtain the frame data with other video processing tools(like ffmpeg).
Is there any helpful method in GPAC that can achieve this?
How to obtain the frame data?
This is a GitHub Issue
repo:gpac
owner:gpac
Title : How to obtain the frame data?
Issue date:

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Hello, everyone. Is there any method to obtain the frame data of the hevc tiled video?
When i use MP4Box to produce DASH video from a single MP4 file, I can simply concatenate the init.mp4 and the .m4s files like this:
```
cat init.mp4 1.m4s 2.m4s 3.m4s > target.mp4
```
Then i can use other tools to obtain the frame data of the video.
However, if i produce a tiled DASH video according to the wiki "HEVC Tile based adaptation guide", i find that the method i used no longer works. 
When i want to concatenate the DASH files of one of the tracks (3x3+1 in wiki), the output can not be played seperately which means i can not obtain the frame data with other video processing tools(like ffmpeg).
Is there any helpful method in GPAC that can achieve this?
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