HandBrake Deinterlace Not Working: How to Fix Combing Lines

If HandBrake finishes an encode but moving objects still have horizontal combing lines, jagged edges, or interlace artifacts, the problem usually falls into one of four categories: the wrong filter was selected, the filter was configured too narrowly, the source uses telecine rather than ordinary interlacing, or the encoded file is being judged in a player that handles the video differently. A short test encode can identify the cause without repeatedly processing an entire movie or recording.

This guide focuses specifically on interlacing, deinterlacing, decomb, and telecine symptoms. It applies to HandBrake on Windows, macOS, and Linux and covers common sources such as DVDs, older camcorders, broadcast recordings, camera files, and previously converted video. The goal is to remove visible artifacts while preserving as much sharpness and natural motion as possible.

1. Confirm the Symptom With a Small Test Encode or Preview

Before changing filters, confirm that the problem is actually interlacing. Combing appears as thin horizontal lines extending from the edges of moving people, vehicles, text, or camera pans. It is often easiest to see when stepping through frames or pausing during fast motion. A person's moving arm may appear split into narrow horizontal strips because the two fields were captured at different moments.

Do not confuse combing with blockiness, ringing, low resolution, motion blur, or poor scaling. Deinterlacing will not repair those problems. It can soften the image unnecessarily if the source is already progressive.

1.1 Choose a Useful Motion Scene

Use HandBrake's preview controls to inspect several parts of the source. Select a scene containing sideways movement, scrolling credits, a quick pan, sports action, or a person walking across the frame. Static scenes can conceal interlacing because both fields contain nearly identical visual information.

Create a short test encode around the affected scene if preview images do not make the problem obvious. A clip of 20 to 60 seconds is usually enough. Keep the same dimensions and avoid aggressive compression so that encoding artifacts do not distract from the test.

1.2 Check More Than One Timestamp

Some files mix progressive and interlaced sections. Television material may contain progressive programs, interlaced transitions, and inserted footage from other sources. A filter can therefore appear successful in one scene while missing artifacts elsewhere.

Check at least one static scene, one moderate-motion scene, and one fast-motion scene. Success means edges remain coherent during movement, with no repeated horizontal teeth or field-separated outlines. Once representative motion scenes look clean, stop increasing filter strength unless another specific section still fails.

2. Check the HandBrake Settings Directly Related to This Problem

HandBrake places relevant controls in the Filters section. The exact layout may differ between graphical interfaces, but the important choices are Decomb, Deinterlace, and Detelecine. Avoid enabling every filter at once. Each addresses a different pattern, and unnecessary filtering can remove detail.

2.1 Use Decomb for Mixed or Uncertain Material

Decomb is often the practical first choice when a source contains both progressive and interlaced frames or when you are not certain how it was produced. It detects combing and processes frames that appear to need correction rather than treating every frame as interlaced.

Start with a standard or default Decomb preset rather than the strongest setting. Encode the same motion sample and compare it with the unfiltered output. The fix is working when the horizontal teeth disappear from moving edges while stationary areas retain their original detail.

If artifacts appear only occasionally, a detection-based approach can preserve more detail than deinterlacing every frame. However, detection can miss weak or unusual combing. If obvious artifacts remain in the same frames, test a conventional Deinterlace setting instead of repeatedly raising unrelated quality controls.

2.2 Use Deinterlace for Consistently Interlaced Sources

Deinterlace is appropriate when the footage is consistently interlaced, as is common with many standard-definition broadcast recordings, DVDs, and older camcorders. It processes the field-based image into progressive frames suitable for modern displays and typical web playback.

Choose a method and preset that balance motion reconstruction with processing time. More demanding methods may preserve moving edges better but take longer. They cannot recreate detail that was never captured, and an excessively strong filter can make faces, fabric, and fine text look soft.

Compare the filtered test with the source at the same display size. Success is not merely a blurrier image with less visible combing. A successful result has clean moving edges, stable fine detail, and natural motion. Stop changing settings once those conditions are met.

2.3 Apply Detelecine Only When the Source Uses Telecine

Detelecine is not a stronger form of deinterlacing. It is intended for material originally captured at a film-like progressive frame rate and converted to a higher field rate using a repeated field pattern. This is commonly associated with telecined film content in certain DVD and broadcast workflows.

Telecine symptoms can include a repeating cadence in which some frames look clean while others appear combed, or motion seems to alternate between smooth and uneven. In that case, test Detelecine with an appropriate frame-rate setting. If the source also contains genuinely interlaced segments, Decomb may still be useful after telecine handling.

Do not enable Detelecine merely because the source came from a DVD. DVDs can contain telecined, interlaced, progressive, or mixed material. Use the visible cadence and the Activity Log rather than the container alone to decide.

2.4 Leave Progressive Sources Unfiltered

Phone videos, screen recordings, modern camera files, downloaded web video, and many Blu-ray video sources are commonly progressive, although exceptions exist. If frame-by-frame inspection shows no combing during movement, leave Decomb, Deinterlace, and Detelecine disabled.

Applying a deinterlacing filter to progressive footage can reduce vertical detail, soften text, or alter motion without solving a real problem. Success for a progressive source means the unfiltered encode matches the source's clean moving edges. In that situation, the correct fix is to stop filtering.

2.5 Choose a Frame Rate That Matches the Processing Goal

Frame-rate selection affects motion but does not replace deinterlacing. For an initial troubleshooting test, use the source frame rate or a rate appropriate to the intended result, and avoid making an unrelated frame-rate conversion at the same time.

Constant frame rate can help when a particular editor, device, or delivery system requires predictable timing. Variable or peak frame-rate behavior may preserve source timing in other workflows. If a deinterlacing method produces one progressive frame per field, the output can have a higher frame rate and smoother motion than a method producing one frame per interlaced frame. This difference is especially visible in sports and camcorder footage.

If the combing is gone but motion looks unusually choppy, compare the selected frame rate with the source's field-based motion. Do not restore combing to gain smoothness. Instead, test a deinterlacing mode and output frame rate capable of retaining the desired motion cadence.

3. Check Source, Output, and Playback Factors

When the filter settings appear correct, verify that you are examining the intended source, title, preview range, and output file. This sounds simple, but stale files and player behavior can make a successful encode look like a failed one.

3.1 Treat DVDs and Older Camcorders Carefully

Standard-definition DVD and older camcorder sources frequently require closer inspection because they may be interlaced, telecined, or mixed. They may also use non-square pixels, so judge the result at the correct display aspect ratio. Stretching a frame can make diagonal edges look worse even after combing has been removed.

Select the correct title and angle from media you have the right to process. If HandBrake cannot read a protected source, this article does not cover bypassing access controls. Work from an authorized, readable source file or unprotected media instead.

3.2 Rule Out the Destination and Stale Output Files

Give every test a distinct filename and save it to a simple local folder with adequate free space. After encoding, open that exact path rather than a similarly named earlier file. Check the modification time and duration.

A destination problem generally causes a failed or incomplete encode rather than persistent combing, but opening an old output can perfectly imitate a filter failure. Success means the newly created test file has the expected timestamp and visibly reflects other test changes.

3.3 Compare Playback Applications and Devices

Some players automatically deinterlace flagged interlaced content, while others display its fields directly. A source can therefore look clean in one application and combed in another. Conversely, a player's post-processing can make an unfiltered file appear fixed even though the encoded frames remain interlaced.

Test the output in at least two reputable players or inspect frames without automatic deinterlacing. Also compare playback on the computer with the intended television, browser, media server, or mobile device. A properly deinterlaced output should remain free of combing even when the player does not apply its own deinterlacing.

3.4 Isolate Hardware Encoding and Driver Variables

HandBrake normally applies video filters before sending frames to the selected encoder, so changing from a hardware encoder to a software encoder is not the first deinterlacing fix. It is still a useful isolation step if the preview is clean but only completed hardware-encoded files appear wrong, corrupted, or visually inconsistent.

Run the same short sample with a software video encoder. If both outputs show identical combing, return to the filter and source analysis. If only the hardware-encoded output fails, update the operating system and supported graphics driver, then retest. Success means the software and hardware versions show the same clean moving edges.

3.5 Keep Audio and Subtitle Tests Simple

Audio tracks do not create combing in video. Subtitle tracks also do not change the underlying field structure, although burned subtitles become part of the filtered image and can complicate visual comparisons. For a diagnostic encode, select one ordinary audio track and disable subtitles unless the failing scene requires them.

If removing extra tracks changes whether the job completes, investigate that track separately. If the encode completes but motion still has horizontal teeth, concentrate on video filters rather than audio settings.

4. Use the Activity Log to Separate Guesswork From Evidence

The Activity Log records how HandBrake scanned and processed a job. Open the log for the specific test encode, not only the general application log. Look for the selected title, source dimensions, frame-rate information, filter chain, encoder, destination, warnings, and errors.

4.1 Verify That the Intended Filter Was Applied

Search the log for references to decomb, deinterlace, detelecine, comb detection, or the video filter chain. The wording can vary with the interface and filter selection, so focus on whether the intended filter appears and whether its settings match the test you submitted.

If no relevant filter appears, return to the Filters section, choose the desired setting, add the job again, and start a new encode. Existing queued jobs may retain the settings they had when they were added. Success means the new job log explicitly reflects the intended filter chain.

4.2 Check for a Mismatched Title, Range, or Preset

Confirm that the log identifies the expected source title, chapters or time range, dimensions, preset, and destination. Also check whether loading another preset reset the filter selection before the job entered the queue.

Warnings about decoding, dropped data, or damaged frames can point to source problems rather than an ineffective filter. Preserve the complete log when requesting help because a single copied error line may omit the filter and source context needed to diagnose the issue.

5. Run a Clean Temporary Encode With Minimal Settings

A controlled test is the fastest HandBrake deinterlace not working fix when several variables have changed at once. The purpose is not to create the final file. It is to prove whether HandBrake can remove the artifact from a known scene.

1. Open the original source again and select the correct title.
2. Choose a short range containing obvious movement and visible combing.
3. Load a normal built-in preset suitable for the source resolution.
4. Disable optional sharpening, denoising, grayscale, and unrelated filters.
5. Start with Decomb at a standard setting for uncertain or mixed material.
6. Keep the source dimensions and avoid unnecessary cropping during the test.
7. Select a reasonable source-related frame rate.
8. Use one audio track, no subtitles, and a local destination with a new filename.
9. Encode with a software encoder if hardware behavior is under suspicion.
10. Inspect the result in more than one player and review the Activity Log.

If Decomb misses clearly combed frames, repeat the identical range with Deinterlace. If the artifacts follow a telecine cadence, repeat it with Detelecine configured for that source pattern. Change only one major variable per test so that the winning setting is obvious.

Once a short clip is clean, apply those settings to a somewhat longer range containing different scene types. If that passes, proceed with the full encode. Stop experimenting when representative motion is clean and detail remains acceptable. Stronger filtering after that point usually increases processing time or softness without providing a visible benefit.

6. Quick Fix Checklist

• Confirm that the artifact consists of horizontal teeth on moving edges.
• Preview a fast-motion scene rather than a static frame.
• Try Decomb first when the source is mixed or uncertain.
• Use Deinterlace when the material is consistently interlaced.
• Use Detelecine only when a repeating telecine pattern is present.
• Leave progressive sources unfiltered.
• Keep frame-rate changes separate from the first filter test.
• Verify the filter chain in the job's Activity Log.
• Use unique output filenames so an old encode is not mistaken for the new one.
• Compare two players and disable reliance on player-side deinterlacing.
• Test a software encoder if only hardware-encoded output behaves incorrectly.
• Avoid stacking strong filters that make the picture unnecessarily soft.

7. Frequently Asked Questions

7.1 Why Does the HandBrake Preview Still Show Combing?

You may be viewing an unfiltered source preview, a frame outside the selected preview range, or a scene the current detection threshold does not classify as combed. Create a short encoded preview and inspect its motion frames. Then verify the filter in the Activity Log. If a standard Decomb test misses obvious combing, compare it with a Deinterlace test.

7.2 Should I Use Decomb or Deinterlace in HandBrake?

Use Decomb as a practical starting point for mixed, uncertain, or mostly progressive material with occasional combed frames. Use Deinterlace when the source is consistently interlaced and every motion section requires processing. The best choice is the least aggressive option that removes combing throughout representative scenes.

7.3 Can Detelecine and Decomb Be Used Together?

They can be relevant to the same mixed source because they solve different problems. Detelecine attempts to reverse a telecine cadence, while Decomb addresses frames that remain visibly combed. Do not combine them automatically. Test the telecine pattern first and confirm the resulting filter chain in the Activity Log.

7.4 Why Is the Video Soft After Removing Combing?

Deinterlacing must reconstruct progressive frames from fields captured at different times, and some methods sacrifice vertical detail to prevent artifacts. Softness can also result from unnecessary denoising, scaling, or applying deinterlacing to progressive footage. Disable unrelated filters, preserve the source dimensions for comparison, and use the mildest setting that cleans moving edges.

7.5 Does Changing the Video Encoder Fix Interlacing?

Usually not. Interlace removal is a filtering operation performed before video compression. Changing encoders is useful only as a diagnostic step when the filtered preview looks correct but a particular hardware-encoded output does not. If all encoders show the same combing, correct the filter selection or source interpretation.

7.6 How Do I Know the Problem Is Fixed?

Pause and step through several motion-heavy scenes. Moving edges should no longer split into horizontal lines, motion should remain natural, and static detail should not be needlessly blurred. Confirm the result in another player and verify the filter in the Activity Log. When those checks pass across representative sections, stop changing settings and run the final encode.