![]() To maintain an unbroken chain of custody, you need to document your acquisition. See the “ Organize” section in the workflow for more information on naming files. The original filename is important for retaining the original order or sequence of raw video files, and is sometimes even essential for the full functionality of the video (e.g. If your video file still has the original filename from the camera, you should not rename the file. ? / \ = : ”, | *), is excessively long, or contains spaces. There is no need to rename the acquired video files, unless the filename uses “illegal” characters (e.g. Provide the hash value when you share the video with others, so that they can verify that they received the video intact. As part of chain of custody, keep a record of the hashes to demonstrate that your files have not been tampered with or altered over time. Sha1sum is a free command-line utility for computing and checking SHA-1 checksums that is part of the GNU Core Utilities.Ĭompute hashes of your videos when you acquire them, and check against hashes from the source if available. Md5deep and hashdeep are a free command-line tools for computing and comparing multiple checksums for entire directories of files. MD5 is a free command-line utility for computing MD5 hashes (aka checksums). Karen’s Hasher is a Windows GUI tool for computing and verifying hashes. See “ Keeping Files Intact (and Proving It)” for more information on how to do this. checksums) of acquired files against hashes computed on the source. If collecting original files, check hashes (i.e. If collecting original files, verify that the number of files and file sizes match the source. You can still acquire unverified videos, but take note what information is missing or may be unreliable.Īfter you have copied, moved, or downloaded the video and any metadata or documentation, check to make sure you have acquired the files completely and intact: Simple methodĪttempt to play back or open the files. When acquiring from untrusted or unknown sources, take steps to verify information, such as by examining the sources or corroborating the videos with other known information. Try to fill in missing information by contacting the creator or source, or through research. if the camera is set to the wrong date and time). Remember that not all metadata is correct, complete, or reliable. Even metadata embedded in a file can be incorrect (e.g. The free version of MediaInfo displays metadata embedded in video and audio files in the command-line. MediaInfo ($0.99, GUI version) displays metadata embedded in video and audio files. YouTube Data API allows you to obtain detailed metadata about a video, including metadata from the original video file (which itself is not available). TubeKit is a YouTube crawler that allows you to extract YouTube video data (author, keywords, genre, number of views, ratings, comments, etc.), collect text comments for YouTube videos, and extract a YouTube users’ profile data. Record this information in some form, such as a text document, spreadsheet, or database. Metadata can also be communicated to you orally or in person. a text document), sent or displayed separately from the video file (e.g. Metadata can be embedded in the video file, delivered with the video files in another format (e.g. YouTube-dl is a command-line tool to downloading videos from video sharing sites.Īlong with the video, make sure you acquire any metadata or documentation that comes with it. WAIL (Web Archiving Integration Layer) is a one-click tool for acquiring web pages, including ones with video. Secondarily, select the highest quality copy that is available in a widely used and current format. ![]() as opposed to a derivative of a derivative). If you have a choice between non-original files, select one that was derived from the original (i.e. when downloading from YouTube), your only option may be to download a transcoded derivative. In situations where the original file is not available (e.g.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |