How to merge .ts files to .mp4 in java android studio - java

I have downloaded all .ts files from .m3u8 URL, as shown below:
Now I want to merge all .ts files into one .mp4 file.

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File content is blank, when raw file downloaded from gitlab using gitlab api

Using GitLab Api, I am able to download the raw file and writing to a new file using Angular8 functionality. After writing when I am extracting that file it's showing blank content. Please suggest I have a requirement for download of zip file from gitlab repository in a file explorer. Below api i have used.
Get raw file from repository
GET /projects/:id/repository/files/:file_path/raw
curl --header "PRIVATE-TOKEN: <your_access_token>"
"https://gitlab.example.com/api/v4/projects/13083/repository/files/app%2Fmodels%2Fkey%2Erb/raw?ref=master"

Size of exported folder

What is the difference between the project folder in android studio directory which is in my case nearly 50 megabytes and the .zip file which i export from inside the android studio which is nearly 2 megabytes only ?
and if i send a friend both folders , what is the difference he will face ?
.zip is an archive file format that supports lossless data compression, i.e. your .zip file is your compressed project folder. Assuming that's what you created the .zip file from and not something else.
If you send your friend your project folder and the .zip file, the only difference should be in the download times. Once again assuming your .zip file was created from your project folder, and that your friend has software that can open a .zip archive. Which they should have, since it's free and easily downloadable or comes with their operating system.

How do I campare contents of local folder on android sdcard with the contents of a folder on dropbox?

I am developing a android app and I am supposed to download some data to a folder on sdcard from dropbox folder and once the download is complete only then the app can start.
The problem is I have some files available on my sdcard folder which are also present on dropbox folder along with some other files ,and now when I start my app I should be able to download only those files which are not there on my sdcard folder. How should I go by it? Thanks.
When you download any files from Dropbox, store the rev value from the Dropbox file's metadata.
Later, when you check again, if the remote rev matches your local value, you know you still have the same version. If not, download the new version.
Just checking the filename and file size is error prone, since two different versions of a file can have the same size.
Edit: The Dropbox API now offers a hash of file data that you can use to verify a file's contents. In the API v2 Java SDK, it's available as FileMetadata.contentHash.
It isn't a single MD5 or SHA1, but rather a combination of SHA256 hashes of the pieces of the file. You can find more information here:
https://www.dropbox.com/developers/reference/content-hash

How to stop creating thumbs.db files in compression using java

I am trying to compress a folder to zip and extract the same folder using java. When i zipped or unzipped the folder the files which are in the folder compressed and extracted successfully. But a Thumbs.db file is creating with in the folder.
I want to delete/avoid the Thumbs.db files before/after compressing to zip or extracting from zip programmatically.
Is it possible in java ?
Thumbs.db is usually a file with the system and hidden attributes (see attrib.exe ) and therefore invisible in the Explorer (unless you set the Explorer to show all files including system files).
When you extract the file you should set it's attributes accordingly.
How to set a file attribute using Java is already described here: https://stackoverflow.com/a/36465283/150978

Modify txt file at server

I am trying to make an app that can read, update, delete each line of a .txt file
How to access(read, update, delete) .txt file directly from the server with android device without having to download the .txt file.
This is the link I tried How to read from .txt file
but I got error when I tried it
You would have to make the changes serverside if you don't want to download the .txt file.
However, since a .txt file usually isn't that big, it should not be a problem to download it, edit it and upload it again using FTP.

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