I am new to this website and this is my first question, really appreciate if someone can provide some advice about my current problem.

I've been testing some videos on my computer to see at what video quality will the video start to jitter. I've tried using multiple ways to create the video, from creating an animation video off adobe aftereffects to downloading existing videos.

As I tested the videos on my computer, I realise even videos with the same bitrate, resolution and FPS, the smoothness still differs from video to video. I ensured the videos are all smooth on a more powerful computer prior to the testing.

Does anyone know what are the other factors that might affect the quality of the video which is causing the difference?

Your advice is really much appreciated, thanks!

  • It's possible that your system is dropping frames if it lacks the computational power required to playback a video in real time. And if you see differences between videos having the same video format (including a fixed bitrate), then that may be due to the complexity of the information in the bitstream. E.g. if your system's weakness is the number of pixels it can draw in a given time, then it may have a hard time processing complex changes between two frames. The codec will place many changes with lower quality in the same amount of bits as few changes with high quality. – Run CMD May 4 '16 at 7:27

The codec being used (both for compression and decompression) and the complexity (amount of change) can cause substantial variances, as can the method of encoding. Particularly with systems with lots of changes, the computer may need to do more work to calculate them out.

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