Hello! Sorry for my bad English, i am from Ukraine🙂
I am facing a problem on android when i want to get the previous frame. On some videos, the previous frame is set correctly, but on some it happens that instead of rewinding 1 frame, the grabber rewinds ~ 10-30 frames (most often equal to the number of fps). This only happens when rewinding of back, when I get the next frame - I always get the correct frame. My guess is that this problem is due to the closest frame capture (like as in MediaMetadataRetriever OPTION_CLOSEST_SYNC). Here is the most simplified code that can cause this problem:

grabber.getFrameNumber(); // for example, 300
grabber.setFrameNumber(grabber.getFrameNumber() - 1);
grabber.grabImage(); // 270, although 299 is expected

How can it be solved? Maybe I missed something in the documentation? Noticed this on mp4 video format.
Thank you.