This video demonstrates the problem. The video starts at 0, as demonstrated by looking at the frames such as with "ffprobe -select_streams 0 -show_frames timing.mp4 |less".
But vlc starts video playback around 2, showing frame 0 at that time, and ends at the 6th frame (frame 5), not displaying the last four frames at all. As with bug #1443835, pressing 'e' to advance a frame doesn't work. Changing decoding and output options doesn't change this. Seeking to the middle of the video, though, does cause vlc to... 1) display frame 5 2) very briefly display frame 6 3) display frames 7, 8, and 9 for the normal time duration. This could be related to frames 8 and 9 having no decoding-time-stamp listed in ffprobe, so vlc or libav could decide to decode them simultaneously (instead of 1 sec apart), and then display the most recent frame in the buffer (since it's already 2 sec late) each time one of those frames is decoded. It isn't clear why this doesn't happen for normal playback though, without seeking. The video was generated with this command: ffmpeg -ss 4.5 -i '『-Project DIVA F-』 - Nostalgic [40_XMJzyQPE].webm' -vf "fps=1,split[crop],lutyuv=val/1.2-10:val/2+64:val/2+64[bottom],[crop]crop=iw:ih/4:0:'mod(n,4)*ih/4',[bottom]overlay=0:'mod(n,4)*h'" -hide_banner -t 10 timing.mp4 I note that avplay (I don't have ffplay) plays it better; it does display the first frame only briefly, and then turns black, but all the rest of the frames are displayed at the correct times. (Totem also works correctly.) So it seems like vlc should be getting frames earlier than it is. Since framerate can be variable, this wouldn't be based on a buffer of a certain length of time. ** Attachment added: "timing.mp4" https://bugs.launchpad.net/ubuntu/+source/vlc/+bug/1443856/+attachment/4375581/+files/timing.mp4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1443856 Title: Very short videos won't play To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/vlc/+bug/1443856/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
