Cut OGV

How to Cut OGV Video Online

1. Upload Your OGV File: Drag and drop or click "+ Add Files" to select OGV files exported from Audacity, Blender, OpenShot, MediaWiki uploads, or older Firefox HTML5 recordings. Batch is supported — drop in several files and the same cut range applies to each.
2. Set Start Time and Duration: Use the Time Range controls to enter a start time and a duration to keep. Both fields accept seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Add multiple trim segments to extract several clips from one source — each pair produces its own output file.
3. Pick Codec, Quality, and Resolution (Optional): Default is stream-copy — no re-encoding, bit-identical to source, output stays Theora (or VP8) with Vorbis or Opus audio. To re-encode for a smaller file or frame-accurate cut, choose a Quality Preset (Highest to Lowest), set a Target file size (%), or pick Constant Quality (CRF). Use Video resolution to keep the source size or downscale to 1080p, 720p, 480p, 360p, or 240p.
4. Cut and Download: Click Cut. Files process in your browser session — download individually or as a ZIP. No sign-up, no watermark, no upload to a third-party server.

Why Cut OGV Files?

OGV is the Xiph.Org Foundation's container for Ogg-wrapped video, first released alongside the broader Ogg framework in May 2003 and adopted as the file extension Xiph recommended for video-bearing Ogg streams in 2007. The container almost always carries Theora video paired with Vorbis (and sometimes Opus or FLAC) audio. OGV was the only video format Firefox 3.5 shipped with HTML5 <video> support in 2009, and it remained the open-codec default for Wikipedia, Wikimedia Commons, MediaWiki sites, and a long tail of FOSS projects through the 2010s. Common reasons to cut an OGV:

• Trim Wikimedia Commons or MediaWiki uploads — Commons stores video in OGV (Theora) and WebM only. Editors regularly need to shave intros, attribution leaders, or off-topic footage off a source clip before re-uploading the cleaned version.
• Pull a clip from an Audacity, Blender, or OpenShot OGV export — Older versions of these open-source tools defaulted to OGV/Theora when no MP4 codec was bundled. Cutting in-place beats re-exporting from the original project.
• Shorten archived Firefox or Chromium-era screen recordings — Pre-2015 browser-based capture tools (MediaRecorder polyfills, the original Loom prototype, several Firefox extensions) wrote OGV. Cut a 20-minute recording down to the 30-second segment that still matters.
• Reduce file size before converting to a modern format — Stream-copy cuts run in seconds and are lossless; a 5-minute OGV trimmed from a 60-minute source then transcoded to MP4 via OGV to MP4 runs roughly 12x faster than transcoding the full hour first.
• Salvage usable footage from corrupted or partially-downloaded OGVs — Cutting at a known-good range often extracts a playable segment from a file whose tail is broken or whose Theora stream errors out near the end.
• Strip dead air from lecture, podcast video, or interview recordings — Many university and conference archives sit on OGV recordings from the Theora era. Drop the 30-second silence before the speaker started without re-encoding.

Often you cut on the way to a more compatible format: see OGV to MP4 for H.264/AAC, OGV to WebM for VP9/Opus, or OGV to MP3 to extract audio only. To shrink without changing format, see Compress OGV.

Stream-copy vs Re-encode — When to Use Which

Property	Stream copy (default)	Re-encode (Theora / VP8)
Speed	Seconds for any file size	Proportional to clip length and CRF
Quality	Bit-identical to source	Slight loss unless CRF is low (high quality)
Cut precision	Snaps to nearest preceding keyframe (typically 1–10s in Theora)	Frame-accurate
Output codec	Same as input (Theora or VP8)	Theora or VP8 within the OGV container
Audio	Original Vorbis / Opus preserved	Re-encoded to Vorbis or Opus
File size	Proportional to duration kept	Variable by CRF or target %
Best for	Quick lossless extraction	Frame-accurate cuts, smaller file, fixing source issues

If you only need "minutes 2–5 of this 20-minute screen capture" and don't care about the exact frame, stream-copy is faster and lossless. If the cut has to land on the precise frame a slide changed, enable re-encode in step 3.

OGV Codec Quick Guide

Codec	Role	Notes
Theora (video)	The historical default for OGV; descended from On2's VP3 (donated to Xiph in 2002), Theora I spec finalized June 3, 2017	DCT-based, no B-frames, 8-bit per component, no interlacing; royalty-free
VP8 (video)	The other open codec OGV can wrap; more commonly seen in WebM	Roughly 30–50% smaller than Theora at matched quality; supported by every browser that ever shipped WebM
Vorbis (audio)	The historical default audio for OGV	Royalty-free; transparent around 192 kbps; smaller than MP3 at matched quality
Opus (audio)	The modern Xiph audio codec; standardized as RFC 6716 in 2012	Best quality-per-bit below 128 kbps of any common codec; supersedes Vorbis in new projects
FLAC (audio, rare)	Lossless audio inside OGV	Largest files; only used when bit-exact audio matters

If the file you're cutting has Theora video + Opus audio, every modern open-source player (VLC, mpv, MPC-HC) handles it; Firefox played the file natively through version 129 before Mozilla disabled Theora by default in 130. Chrome, Edge, and Opera disabled Theora by default in Chrome 120 (December 2023) and removed the decoder entirely in Chrome 123 (March 2024); Safari has never shipped Theora. If you want the cut clip to play in a modern browser without an extension, re-encode or convert to MP4/WebM.

Frequently Asked Questions

Will the cut OGV still play in VLC, Firefox, and Chrome?

VLC and mpv play every OGV variant unchanged after a cut — both ship their own Theora, VP8, Vorbis, and Opus decoders. Firefox played native Theora/Vorbis through Firefox 129 and disabled it by default in version 130 (caniuse status as of 2025). Chrome, Edge, and Opera removed Theora support entirely in Chrome 123 (March 2024). If you need the cut OGV to play directly in a current Chromium browser, convert to OGV to MP4 or OGV to WebM after cutting. Safari has never supported Theora at any version.

Why does my cut start a few seconds earlier than I asked for?

Stream-copy mode can only cut on keyframes (I-frames), and Theora encoders typically place keyframes every 1–10 seconds depending on the encoder's keyframe interval setting. Asking to start at 00:01:23 may snap back to 00:01:18 if that's the nearest preceding keyframe. To land precisely on 00:01:23, switch to re-encode in step 3 — the cut becomes frame-accurate at the cost of some encode time.

Can I make multiple cuts from one OGV in a single pass?

Yes. Add multiple Time Range segments — each pair of start time + duration produces a separate output clip. Useful for splitting a Wikimedia lecture upload into chapters, pulling several highlights from a long Blender render, or extracting every speaker turn from a recorded panel.

My OGV is from Wikimedia Commons — can I cut and re-upload?

Yes, mechanically. The cut output is still an OGV with the same Theora (or VP8) + Vorbis (or Opus) codecs, so it satisfies Commons' file-type policy. Verify the source license allows derivative works (most CC-BY-SA and PD content does), preserve attribution per the source's license terms, and credit the original upload in your edit summary when you re-upload.

Does cutting in stream-copy mode lose quality?

No. Stream-copy literally copies the encoded Theora/VP8 video and Vorbis/Opus audio packets between the new in- and out-points, then rewrites the Ogg page headers. The output is byte-equivalent to the source within the kept range — there's no decoding or re-encoding step. The only constraint is keyframe alignment described above.

What's the maximum OGV file size I can cut?

There's no hard cap. Cutting runs entirely in your browser session, so the practical limit is your device's RAM and how long you're willing to wait for the file to load. Multi-GB lecture archives and 2-hour Theora streams work fine. Stream-copy is fast enough that even a 4-hour Theora-at-720p file usually finishes the cut in well under a minute — no transcoding happens.

Can I extract just the audio (Vorbis or Opus) from the cut OGV?

Yes — use OGV to MP3 to pull the audio track out as MP3 during conversion. If you need the audio in its original Vorbis or Opus form without re-encoding, cut first in stream-copy mode, then run the result through the conversion. Avoiding the MP3 round-trip preserves a few hundred kbps of headroom for spoken-word audio.

Should I cut first or convert OGV to MP4 first?

Cut first, always. Stream-copy cutting is effectively free (seconds, lossless), and cutting before transcoding reduces the work the encoder has to do. A 5-minute cut from a 60-minute OGV transcoded to MP4 takes roughly 1/12th the time of transcoding the full hour and trimming the MP4 afterward. Use the OGV to MP4 converter on the cut output.

Cut vs trim vs split — which one do I want?

For OGV in practice they're the same operation. Some editors reserve "trim" for shaving the start and end while keeping the middle, "cut" for extracting a middle portion, and "split" for breaking one file into multiple files at chosen points. XConvert's cutter handles all three: set start time to your in-point and duration to how much to keep, or add multiple Time Range segments to split. See also Trim OGV for the same workflow with slightly different default labels, or Video Cutter for a generic multi-format version.