Doom9's Forum - View Single Post - DGIndexNV - My video is 9seconds shorter despite correct fps rate

videoh · 10th August 2020, 17:06

Sorry, didn't notice it is MKV.

Sometimes the MKV container framerate and the elementary stream (AVC) frame rate do not agree. Apparently your file has 60 for the MKV container and 59.94 for the elementary stream. What is the real rate? You'll have to process it both ways (use AssumeFPS() in your script), and see which is in sync towards the end of the file. When you remux'ed it, the elementary stream frame rate was used. I guess that setting frame rate to 60 on your command line can only change the MKV framerate; it doesn't change the frame rate of the captured stream.

10th August 2020, 17:06	#4 \| Link
videoh Useful n00b Join Date: Jul 2014 Posts: 1,667	Sorry, didn't notice it is MKV. Sometimes the MKV container framerate and the elementary stream (AVC) frame rate do not agree. Apparently your file has 60 for the MKV container and 59.94 for the elementary stream. What is the real rate? You'll have to process it both ways (use AssumeFPS() in your script), and see which is in sync towards the end of the file. When you remux'ed it, the elementary stream frame rate was used. I guess that setting frame rate to 60 on your command line can only change the MKV framerate; it doesn't change the frame rate of the captured stream. Last edited by videoh; 10th August 2020 at 17:14.