To: kristal
Dear user,
Does the issue appear only when you upload your video file to AVS Video Editor? Or in the output file, too?
The problem with poor quality on preview might be caused by cache tools (by default, program automatically caches high definition files both video and images to HDD for a faster processing while video is editting). Please, note, that it won’t influence the quality of an output video.
You also can disable cache tools by following Edit > Settings > Environment > choose "No cache" > restart the program. Please note, that after it, the program might work slower.
If it doesn't resolve the issue, please contact us again.
Best regards.