Send lazarus mailing list submissions to To subscribe or unsubscribe via the World Wide Web, visit https://lists.lazarus-ide.org/listinfo/lazarus or, via email, send a message with subject or body 'help' to You can reach the person managing the list at When replying, please edit your Subject line so it is more specific than "Re: Contents of lazarus digest..." Today's Topics: 1. Using PasLibVLC to play video files - how to update duration? (Bo Berglund) 2. Re: Using PasLibVLC to play video files - how to update duration? (Bo Berglund) 3. automated testing code (duilio foschi) 4. Re: Lazarus Release Candidate 1 of 4.0 (n7800) 5. Re: automated testing code (Mattias Gaertner) ---------------------------------------------------------------------- Message: 1 Date: Sun, 27 Oct 2024 14:51:04 +0100 From: Bo Berglund To: Subject: [Lazarus] Using PasLibVLC to play video files - how to update duration? Message-ID: Content-Type: text/plain; charset=us-ascii So several years ago I wrote a Video player/editor usng Lazarus/FPC with the PasLibVLC library. ( https://prog.olsztyn.pl/paslibvlc/ ) The last build was done in end of 2023 with the then current FPC/Lazarus/PasLibVLC (3.0.7). It was a cleanup to remove some un-needed fluff on screen not related to the video handling. The utility has worked just fine for the video editing tasks it was created for. It works by playing a downloaded mp4 video file on screen where I can accurately set cut points for section removals. Then it creates the call to a split-combine command line utility I also wrote with Lazarus and built for both Windows and Linux. This utility uses ffmpeg in a command that results in a new video file where the marked sections are removed. I usually work on files located on a Linux server but occationally I also run the splitcombine on Windows. Recently I have found that if I want to use the editor just as a player it does not work with mp4 to view files still being downloaded, so I tested by changing my download script to produce a ts file rather than mp4. This file type can be opened and played while the download is still being done, so the file is being written at the end and played somewhere inside. So far OK, but I have problems when doing jumps since the current version of my editor reads the full length of the video at the time the video file is opened and that stays put. This means that some positioning operations are not possible if they target a time beyond the file length at the time the playback started. Question: --------- How should I proceed to update the video length while playing it in the player? It affects both the length displayed on screen as well as the progress bar showing where the current playback position is located. Should I set up a timer and use that to constantly read the video length (if it is being updated by the library) and set the limits and visuals accordingly? Or is there some means of handling it using some internal callback, event or similar? Unfortunately it was a while since I worked on the code so I will need some start time to get re-familiarized....