+
+ For each incomplete fragment download youtube-dl keeps on disk a special
+ bookkeeping file with download state and metadata (in future such files will
+ be used for any incomplete download handled by youtube-dl). This file is
+ used to properly handle resuming, check download file consistency and detect
+ potential errors. The file has a .ytdl extension and represents a standard
+ JSON file of the following format:
+
+ extractor:
+ Dictionary of extractor related data. TBD.
+
+ downloader:
+ Dictionary of downloader related data. May contain following data:
+ current_fragment:
+ Dictionary with current (being downloaded) fragment data:
+ index: 0-based index of current fragment among all fragments
+ fragment_count:
+ Total count of fragments
+
+ This feature is experimental and file format may change in future.