how to enlarge a video in Premiere Pro without making it blur?

Proper way to import footage

AVCHD footage comes in a complex file structure that contains much more information than is typically found in video clips.  

You can work on footage while it's on the storage card. But if there is any difficulty, the first thing to do is to copy the footage onto a hard disk. Be sure to copy the entire file structure of the card instead of just the clips.

Always use the Media Browser in Adobe Premiere Pro, or use Prelude, to import the footage.

System considerations when working with AVCHD footage

Any computer that meets the system requirements for Adobe Premiere Pro should be able to edit this footage. The main restriction on AVCHD footage is the CPU. This particular format is not dependent on the hard disk speed, as it tends to be small file sizes for video footage.  

Also, the GPU doesn't process the video footage, so the video configuration doesn't have much effect on the performance.

If you're looking to build a system to meet the demands for AVCHD footage, make sure that the CPU is powerful enough. Using AVCHD footage in the Multicam Monitor requires a fast and powerful processor. You can find the system requirements here.

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Potential symptoms

No audio track appears when placing the audio on the timeline

The most common reason for this symptom is that the footage was not imported properly. SeeProper way to import footage.

There can also be a conflicting codec installed on the system. Be sure to uninstall any third-party codecs.

There is an audio track but no audio is heard during playback of entire clip

This symptom is another instance where importing the file properly is the best step. See Proper way to import footage.

Double-check the Audio Mixer to make sure the Audio Track you are working with is not muted or turned low enough to prevent audio playback.

Also, create a copy of Bars and Tones to place on the timeline. This step provides a tone to determine whether your audio hardware is set up properly. 

The video is choppy or non-responsive during entire clip

This symptom can be a sign that Adobe Premiere Pro can't get the CPU processing power required to play back in real time. Make sure that your system meets the system requirements found here.

Additionally, make sure that there are adequate resources available to Adobe Premiere Pro. When working on your footage, keep additional programs to a minimum. 

While scrubbing the timeline, the video freezes up or the audio stops