Have an issue with video playback in using VideoPlayer with RenderTexture on Unity 2019.4.4f1. So we have a poolable window with video which player can open any time. On PC and IOS everything is fine but on some Android devices we faced with video freezing at around 0:03 seconds of playback. For debug now we use video from resources, not from url.
Have you the same Unity version? Does it happen only on Android and not PC and IOS? Are you using a VideoClip or URL? Are you on the latest version of your version? Like @mgear mentioned, did you check for error messages on Android? Have you tried checking the profiler? Are your clips encoded with H264 or VP8? I need a little bit more info to help you as freeze can be caused by many things