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How to Fix Blocky or Pixelated MP4 Video After Converting Sony MTS in Clipchamp

Emma Brown Oct 19, 2026 869 views

Question details

Users experience a drop in video quality when combining and exporting Sony MTS files to MP4 using Clipchamp.

How to Fix Blocky or Pixelated MP4 Video After Converting Sony MTS Files in Clipchamp

Product: Clipchamp
Device & OS: not provided
Scenario: Exporting or converting Sony MTS video footage into MP4 format for seamless combining, sharing, or playback.
Observed behavior: The resulting MP4 video appears blocky, pixelated, or less smooth compared to the original MTS source files.

Before you start

Verify the original properties of your Sony MTS files, such as resolution and frame rate, to ensure you can match these settings closely during the final export.

Solution 1Recommended

Adjust Clipchamp Export Settings

Match your Clipchamp export resolution to your original footage to prevent unnecessary compression and pixelation.

Often, blocky video is the result of selecting an export resolution or frame rate that is lower than the original footage. Retaining the highest available matched setting maintains the source quality.

Update Clipchamp

Ensure you are running the latest version of the Clipchamp app to utilize the most recent video decoding and encoding improvements.

Set High Resolution on Export

Click the 'Export' button in the top right corner. Select the highest resolution that matches your original footage (such as 1080p).

Test a Single File

Import just one MTS file into a new project timeline and export it. This isolates the problem to determine if a specific file or the combination of files is causing the pixelation.

Avoid lowering frame rates: Do not intentionally lower the frame rate during export, as this will result in choppy playback that appears less smooth than the original.

Solution 2

Pre-convert MTS Files Using a Dedicated Converter

Use software like HandBrake to convert the MTS files to high-quality MP4 before importing them into Clipchamp.

Solution 3

Verify MP4 Playback in an Alternative Media Player

Rule out the possibility that the pixelation is caused by the media player rather than the video file itself.

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Frequently Asked Questions

Why does Clipchamp make my video pixelated?

Pixelation or blockiness usually occurs due to a low export resolution, a reduced bitrate, or frame-rate mismatches during the export process. Selecting the highest available resolution (like 1080p) that matches your source file can fix this.

Does Clipchamp fully support Sony MTS files?

Clipchamp supports a wide variety of input formats, but highly compressed or less common AVCHD formats like MTS can occasionally experience decoding issues. Pre-converting them to a standard MP4 format usually ensures smooth editing.

How do I find the original resolution of my MTS file?

Right-click the original MTS file on your computer, select 'Properties', and navigate to the 'Details' tab. Here you can view the frame width, frame height, and frame rate of your source footage.

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