标签：#filesystem

How do you work on a cut in DaVinci Resolve while traveling, when the footage sits on the studio NAS? KEIBI DROP shows the NAS folder on your laptop, over the internet, and fetches only the parts you touch, so you open the footage on demand straight from Resolve, Final Cut or Premiere. To show that, we recorded a Resolve demo: a NAS in Timisoara serves a shoot, a laptop in Bucharest, 400 km away, edits from it. The first take moved 3.17 GB for 146 MB of clips, and Resolve froze inside a read. By the end of the day four bugs were out. All four had been in the code since July and August. They showed up when an editor's read pattern met a saved contact, a daemon restart, a relayed lane and a Mac that went to sleep. This is what each one was, how the trace found it, and what the same take measures now. Measured, with the conditions on the original page: Import four clips | 2 s | 0.1 MB Build the timeline (filmstrip thumbnails) | 8 s | 199 MB Land on clip 2, play 5 s | 8 s | 32 MB Jump to the 4K clip, play 6 s | 13 s | 78 MB Full version, with the limits and the method: The same 16 MiB block, fetched once a second for a minute Source, MPL-2.0: github.com/KeibiSoft/KeibiDrop

It's a good time to also investigate a bit the dart I/O interfaces, especially the one related to files. The dart:io package must be imported to deal with files and directories in Dart. import 'dart:io' ; A file in Dart is an object instantiated by the File class . This object can be created by simply invoking the default constructor , where its argument will be a String . // default constructor can be used // to create a new object pointing to // a local file. File myFile = File ( "./file1.test" ); fromRawPath() is another constructor, it opens a file based on an List<Uint8> ( Uint8List ), this kind of data is usually generated by utf8.encode or ascii.encode . // fromRawPath constructor can be used // to open a file based on a raw path, // an Uint8list. File myFile2 = File . fromRawPath ( ascii . encode ( "./file2.test" ); ); Finally, the fromUri() constructor will open a file based on an Uri object. // fromUri is another construct that // can be used to open a file based on // an Uri. File myFile3 = File . fromUri ( Uri . file ( "./file3.test" ) ); Now the file object has been created, many attributes and methods are available to control it. Let check first the attributes. In the previous examples, all objects are using a relative path, when the object is returned, the absolute path attribute is set. It is the absolute path representation of the data previously passed. print ( myFile1 . absolute ); print ( myFile2 . absolute ); print ( myFile3 . absolute ); $ dart run File: '/home/user/tmp/cboring/./file1.test' File: '/home/user/tmp/cboring/./file2.test' File: '/home/user/tmp/cboring/file3.test' The original path passed as first argument can be retrieved with the path attribute . print ( myFile1 . path ); print ( myFile2 . path ); print ( myFile3 . path ); $ dart run ./file1.test ./file2.test file3.test The file object can also returns an Uri object with the help of the uri attribute . // this is a closure helper to show // the properties from an Uri object and //