Cut M4V (Apple video) by setting start and end times. Only DRM-free M4V files can be processed. No re-encoding, no quality loss.
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M4V is Apple's variant of the MP4 container — same MPEG-4 structure, but with the .m4v extension Apple uses for iTunes Store video, Apple TV app downloads, and exports from iMovie and QuickTime Player on macOS. The audio is typically AAC and the video is H.264 or HEVC, identical to MP4 internally; the extension just signals "Apple-flavored." Cutting an M4V is useful when you want to:
.m4v. Pull out the 90-second moment you want to share without re-rendering the whole file. DRM-protected (FairPlay) titles cannot be processed by any browser tool, including this one..m4v (or .mov) by default. Strip the dead air at the start of a screen recording, the false starts before a take, or the credits at the end without reopening the project.For a different output container after cutting, see M4V to MP4, M4V to MOV, or Compress M4V. For the same workflow framed as trimming, see Trim M4V.
| Property | Stream copy (default) | Re-encode |
|---|---|---|
| Speed | Seconds for any file size | Proportional to clip length |
| Quality | Bit-identical to source | Slight loss unless CRF 18-20 |
| Output codec | Same as source (H.264 stays H.264, HEVC stays HEVC) | Any: H.264, H.265 / HEVC, AV1, MPEG-4 |
| Cut precision | Snaps to nearest keyframe (1-10s) | Frame-accurate |
| Audio | Original AAC preserved | Re-encoded to AAC by default |
| File size | Proportional to duration kept | Variable by CRF / bitrate |
| Best for | Quick lossless extraction | Frame-accurate cuts, codec change, smaller file |
If the moment you want is "minutes 2-5 of this 20-minute iMovie export," stream-copy is faster and lossless. If the cut needs to land on the exact frame (a goal, a punchline, a button-click in a screen recording), enable re-encode and pick CRF 18-20 to keep the loss invisible.
| Source codec | Cut style | Notes |
|---|---|---|
| H.264 (most iTunes / iMovie M4Vs) | Stream copy | Fastest, no re-encode needed, plays on every device |
| HEVC / H.265 (newer iTunes 4K, iMovie HEVC exports) | Stream copy | Preserves ~50% size advantage over H.264 |
| MPEG-4 Part 2 (older iTunes / DivX-style M4Vs) | Stream copy or re-encode to H.264 | Re-encode for modern player compatibility |
| AAC audio (the M4V default) | Stream copy | Preserved exactly in the cut output |
Not in the default stream-copy mode. XConvert writes the original H.264 or HEVC video and AAC audio bytes into a new M4V container without decoding or re-encoding — the cut clip is bit-identical to the corresponding portion of the source. Quality only changes if you opt into re-encode (to change codec, resolution, or compress to a target size). At CRF 18-20 the loss is visually imperceptible even side-by-side with the original.
No. M4V files purchased or rented through the iTunes Store and most Apple TV app downloads are wrapped in Apple's FairPlay DRM, which prevents any third-party tool — browser-based or desktop — from reading the video. The file will load but the cut step will fail. DRM-free M4Vs (your own iMovie exports, QuickTime recordings, ripped personal discs, iTunes purchases that pre-date FairPlay, podcasts) cut without issue.
Stream-copy mode can only cut on keyframes (I-frames), and most M4V encoders place keyframes every 2-10 seconds. Asking to start at 00:01:23 may snap back to 00:01:18 if that's the nearest preceding keyframe — required so the first frame of the output decodes correctly. If you need the cut to land exactly on 00:01:23, enable re-encode in step 3 — that decodes every frame and re-encodes from your specified timestamp, frame-accurate.
Internally none for the cut operation — both are MPEG-4 containers with H.264 or HEVC video and AAC audio. The .m4v extension is Apple's signal that the file may carry FairPlay DRM or Apple-specific metadata (chapters, closed captions for iTunes); MP4 carries the same payload without that signal. A DRM-free M4V can be renamed to .mp4 and most players will treat it identically. If you want the output to play universally without the Apple association, use M4V to MP4 for the conversion or pick MP4 as the output container in re-encode mode.
Yes. Stream-copy preserves the codec exactly, so an H.264 M4V stays H.264 and an HEVC M4V stays HEVC — both play in QuickTime Player, the Apple TV app, the Music / iTunes library, iMovie, Final Cut Pro, and Photos. For maximum cross-platform compatibility (Windows Media Player, VLC, Android), pick H.264 in re-encode mode.
Yes. Add multiple trim segments — each pair of start time + duration produces a separate output clip. Useful for pulling several highlights from a recorded movie, splitting a long iMovie export into chapters, or extracting every appearance of a specific scene from a downloaded episode.
There's no fixed cap. Cutting runs in your browser, so the practical limit is your device's available memory and your patience for the file load. Multi-GB iTunes 4K downloads and hours-long iMovie exports work fine. Stream-copy mode is fast enough that even 4-hour 4K M4V files cut in well under a minute since no transcoding happens.
Cut first. Stream-copy cutting is essentially free (seconds) and lossless, and reduces the file size before the slower transcode step. A 5-minute clip pulled from a 90-minute M4V transcodes to MP4 about 18× faster than transcoding the full file and trimming the MP4 afterward. See M4V to MP4 for the conversion step.
Same operation in practice. Some editors reserve "trimming" for shaving the start and end of a clip while keeping the middle, and "cutting" for extracting a middle portion or splitting at a point. XConvert's cutter handles all three patterns through the same start time + duration controls. See Trim M4V for the same workflow framed slightly differently.