Trim WTV

How to Trim WTV Files Online

1. Upload Your WTV File: Drag and drop or click "+ Add Files" to load a Windows Recorded TV Show (.wtv) capture from your Media Center recording library. Batch trimming of multiple recordings in the same session is supported.
2. Set the Time Range: Under "Trim," pick "Time Range" and enter the start time and duration in HH:MM:SS — for example start 00:02:15 with duration 00:43:30 to cut a 45-minute show down to just the program after the pre-show buffer. Repeat the trim for each contiguous segment if you are slicing around commercial breaks.
3. Adjust Compression (Optional): Under "File Compression," pick a Quality Preset (Highest to Lowest), set a Target file size (%) or a Specific file size in MB, or fine-tune with Constant Bitrate, Variable Bitrate, Constant Quality (CRF), or Constraint Quality. WTV captures from over-the-air HD tuners often run 6-8 GB per hour at the MPEG-2 ATSC bitrate, so compressing while trimming is usually worth doing.
4. Trim and Download: Click "Trim." Files process in your browser session — no sign-up, no watermark, and the recording never leaves your machine for cloud processing.

Why Trim WTV Files?

WTV (Windows Recorded TV Show) is Microsoft's TV-tuner recording container, introduced with the Vista Media Center TV Pack 2008 ("Fiji") and made standard in Windows 7 Media Center. It replaced the older ASF-based DVR-MS format with a new container holding MPEG-2 or MPEG-4 video, MPEG-1 Layer II or Dolby Digital AC-3 audio, EPG metadata, and closed-caption tracks. Because Media Center records the entire scheduled slot — including pre-show buffer, commercial breaks, network bumpers, and post-show overrun — most recordings need editing before they are watchable as a clean program.

• Strip commercial breaks before archiving — A 60-minute slot on US broadcast TV typically contains roughly 18 minutes of commercials per FCC guidance, so trimming around breaks reclaims about a third of the file and runtime before you move the recording to long-term storage.
• Cut pre/post-show padding — Media Center adds a 1-2 minute leader and trailer by default in scheduled recording options; trimming removes that filler so the program starts on frame one.
• Extract a single episode from a back-to-back recording — Marathon recordings (two or three episodes in one block) can be sliced into individual files using sequential trims.
• Free up disk space — One hour of 1080i ATSC capture is roughly 6-8 GB; trimming a 4-hour movie marathon recording down to a single 2-hour film can save 12 GB.
• Prepare clips for sharing or social — Cut highlight segments (a goal, a news clip, a sketch) out of a longer recording before converting to a friendlier format like MP4 or MKV.
• Salvage partially failed recordings — When the tuner drops signal mid-program, trim out the dead zone and keep only the clean portion of the broadcast.

WTV vs DVR-MS — Format Comparison

Property	WTV	DVR-MS
Developer	Microsoft	Microsoft
Introduced	2008 (Vista TV Pack)	2002 (Windows XP MCE)
Container base	New native container	ASF-based
Video codec	MPEG-2 or MPEG-4	MPEG-2
Audio codec	MPEG-1 Layer II or AC-3	WMA or AC-3
Source	Windows 7/Vista MCE TV tuner	Windows XP/Vista MCE TV tuner
EPG / captions	Yes, embedded	Yes, embedded
Editing in WLMM	Direct (Win 7 only)	Direct

Trim Quality and Sizing Quick Guide

Setting	When to use	Trade-off
Quality Preset — Highest	Archive a broadcast at original fidelity	Output near 1:1 source size
Quality Preset — Lowest	Quick preview clip or phone playback	Heavy quality loss on HD source
Target file size (%) — 50%	Halve a long sports recording	Re-encodes; small visible loss
Specific file size — 2 GB	Fit a 4 GB show under a 2 GB cap	Bitrate auto-derived from duration
Constant Bitrate — 4-6 Mbps	1080i broadcast trimmed for plex/Jellyfin	Predictable size, average quality
Variable Bitrate	Mixed scenes (sports + interview)	Smaller file at same perceived quality
Constant Quality (CRF 18-23)	Quality-first trimming	File size varies with content

Frequently Asked Questions

What exactly is a WTV file?

WTV (Windows Recorded TV Show) is the container Microsoft introduced with Vista Media Center TV Pack 2008 and shipped as standard in all Windows 7 Media Center editions. It stores MPEG-2 or MPEG-4 video, AC-3 or MPEG-1 Layer II audio, electronic program guide (EPG) metadata, and closed captions. Unlike its predecessor DVR-MS, WTV does not use ASF as the underlying container.

Why does my one-hour recording have extra time at the start and end?

Windows Media Center records the full scheduled slot plus user-configurable padding — the default in MCE is roughly 1 minute before and 2 minutes after the scheduled program, which is intentional to catch programs that start early or run long. Trimming with Time Range lets you cut both the leader and trailer off the actual broadcast.

Can I trim out multiple commercial breaks in one pass?

Each trim operation isolates one contiguous segment. To keep multiple chunks (program-act-1, program-act-2, program-act-3) from one recording, run sequential trims and download each output, or trim the largest segment now and use trim MKV or trim TS on converted versions later. There is no in-browser timeline with multi-cut markers yet.

Will the EPG metadata and closed captions survive trimming?

The trim re-muxes the stream, so EPG title and description fields and embedded CC608/CC708 caption tracks are preserved in the WTV output. If you re-encode aggressively (Lowest Quality Preset, very low CRF), the caption track is still kept but timing offsets shift to match the trimmed timeline.

Why are WTV files so large compared to a downloaded MP4 of the same show?

WTV captures the full ATSC broadcast stream essentially unchanged — typically 1080i MPEG-2 at 12-19 Mbps for over-the-air HD, versus an MP4 streaming copy at 3-6 Mbps using H.264 or H.265. That makes a one-hour HD WTV recording roughly 6-8 GB, while the same content streamed and saved as MP4 is closer to 1.5-3 GB. Trim plus a Quality Preset of Medium or a 50% target file size usually cuts the WTV down to streaming-equivalent size.

What software still plays WTV in 2026?

Windows Media Center was discontinued with Windows 10 (announced at Microsoft's 2015 Build conference), so WTV no longer has a first-party player on modern Windows. VLC plays WTV on Windows, macOS, and Linux. For older systems, Windows 7 Media Center still plays them natively. Converting to MP4 or MKV is the durable path for long-term playback on phones, smart TVs, Plex, and Jellyfin.

Can I convert WTV to DVR-MS first and trim that instead?

Yes — Windows 7 ships with a WTVConverter.exe utility (and a "Convert to .dvr-ms Format" right-click option) that re-muxes WTV to the older DVR-MS container, which is editable in Windows Live Movie Maker and several legacy tools. If you only need to trim, doing it directly here in-browser is faster and skips the lossy intermediate step.

What's the difference between trimming and compressing a WTV file?

Trimming changes the duration — start at minute 2, end at minute 47 — and produces a shorter file at the same per-second bitrate. Compressing keeps the duration the same but lowers the bitrate or resolution to shrink the file. To do both in one pass, use the Time Range and File Compression controls together, or see compress WTV for compression-only.

Does this tool re-encode the video or just cut the container?

When you only set a Time Range and leave compression/resolution at defaults, the trim operates as close to stream-copy as the container allows and re-muxes without re-encoding the GOP — fastest, no quality loss. The moment you pick a Quality Preset, target file size, bitrate, CRF, or resolution change, a full MPEG-2 or H.264 re-encode runs and quality follows the settings you chose.

My WTV recording is from a CableCARD tuner and won't open — why?

Recordings made through a CableCARD tuner against premium cable channels are typically flagged "Copy Once" or "Copy Never" by the cable provider. Those WTV files carry DRM and are bound to the original Media Center PC; they can be played on that machine but not edited or converted on any other system. Over-the-air ATSC recordings have no DRM and trim normally.