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• Can I cut at keyframes using ffmpeg ?

  23 septembre 2022, par Eng. M.Hamdy

  I am using this command

  


  ffmpeg -start_at_zero -copyts -ss <start time="time"> -t <duration> -i <srcfile> -c copy <dstfile>&#xA;</dstfile></srcfile></duration></start>

  


  to fast cut a part of the mp4 video. I got the keyframes so that I choose the <start time="time"></start> to be of one of them. I thought this will give me an accurate output video starting exactly at that keyframe, but this doesn't happen.
How can I achieve this (fast and accurate cut at the keyframe) ?
In another words : How ffmpeg decides where to start cutting ? I thought it uses the neatest keyframe.

  


  And another question :
How can I encode a portion of the mp4 with exact same video and audio options ? I don't know those options. I just want to keep the output as the original video. The cut in this second case can be at any frame (not always a keyframe).
Thanks.

  


• Try out the latest Piwik 3.0.0 beta version : Piwik 3.0.0 is almost here !

  15 novembre 2016, par Matthieu Aubry — Uncategorized

  Dear Piwik community,

  We are excited today to announce our publicly available Piwik 3.0.0 beta 3 release. We have been been working hard behind the scenes on the new 3.0.0 release for almost one year now. We, the passionate team at Piwik, are dedicated to bringing you a new and improved Piwik experience and invite you to join our beta channel to switch to Piwik 3 today !

  Enable the beta release channel

  Ready to enjoy a much faster Piwik experience and the magic of a modern user interface ? Follow the instructions here and you can upgrade to Piwik 3.0.0 beta in just one click.

  Please note that beta versions have a risk of containing bugs so we don’t recommend to use on a production server. If you find and report a bug in a beta version, we will aim to fix it as quickly as possible.

  Premium plugins in Piwik 3

  In the Piwik Marketplace you can discover & download plugins to enrich the functionality of your Piwik, as well as themes to change the look and feel of your Piwik user interface. The Marketplace integration was much improved in this new release, most notably : you can now purchase and download Premium plugins within Piwik !

  Important changes

  The Piwik 3 upgrade comes with some important changes that may require your attention which we detail in this blog post and in the developer changelog.

  The full list of more than 150 changes can be found in the Piwik 3 beta changelogs : beta 1, beta 2, beta 3.

  What to do next

  When you use the Piwik beta channel and if you come across any issues in Piwik such as a bug, feature missing, regression… let us know on our tracker and create a new issue so we can get this sorted.

  As we are in the final days of Piwik 3 development, we are looking forward to your feedback and help testing !

  Welcome to the future of Piwik,

  Happy Analytics !

• frame extracted from a video using opencv or ffmpeg is vague, picture i snip from video is clear

  15 avril 2024, par user11317826

  I record a video from roadside, and I want to recognize plate license in video. but I find that if I extract every frame from video using python, the frame is too vague to recognize.

  


  I have tried opencv and ffmpeg -i input.mp4 -ss 00:00:10.000 -vframes 1 output.png
`

  


  

  


  but if I snip video every second the picture is clear

  


  

  


  what's the reason of this phenomenon, how can I fix it

  


  I have tried frame average, it didn't work