Initializing... drag & drop files here
Supports: PNG, APNG
Both turn your still PNG into a short video that holds the image on screen. The honest difference is not the codec — it is the label on the file and what that label makes software do with it. M4V is Apple's extension for MPEG-4 video, so a .m4v lands in iTunes, QuickTime and the Apple TV app as a native clip; MP4 is the extension everything else expects. If your destination is an Apple library, pick M4V. If it is a website, a phone you do not control, an upload form or an editor, pick MP4.
| Property | M4V (this page) | MP4 |
|---|---|---|
| Container family | MPEG-4 Part 14 | MPEG-4 Part 14 |
| Muxer used here | The MP4 muxer, writing under the .m4v name |
The MP4 muxer |
| Video codec written | H.264 by default (ITU-T H.264, first approved May 2003) | H.264 by default |
| Other codec entries on this page | MPEG-4, Xvid | Wider list, including H.265 |
| Copy protection | Store-bought M4V files can carry Apple's FairPlay protection | No DRM association |
| What the extension signals | Apple media — opens in iTunes, QuickTime, Apple TV | Generic video — opens everywhere |
| Embedding on a web page | Not the extension the web ecosystem standardised on | The default choice for <video> |
| Audio in a still-image clip | None | None |
| Can you rename between them? | Usually yes for unprotected files, since the bytes are MP4 | Usually yes |
.m4v assets so a script or smart playlist that filters on extension picks yours up too..m4v..m4v is frequently unassociated there, even though the contents are ordinary MPEG-4.| Control | Effect on a still-image clip |
|---|---|
| Merge strategy | One M4V holding every uploaded image in turn, or one M4V per image |
| Image Duration | The entire clip length; with merged images, duration × number of images |
| Background Color | Fills transparent pixels and padding bars — one colour does both |
| Video resolution | Output frame size; "Keep original" uses your PNG's own dimensions |
| Video Codec | H.264 (recommended), MPEG-4 or Xvid |
| Quality Preset | Visual quality and file size; effective on H.264, which is CRF-based |
| Audio | No control renders — a still-image clip is silent by construction |
Structurally, barely. We checked our own muxer configuration: the .m4v extension is mapped to the MP4 muxer, with the same fast-start handling MP4 output receives, so what you download is an MPEG-4 file wearing a different extension. The difference that matters is behavioural — which application claims the file, and which upload validators accept it.
.m4v to .mp4 afterwards?For unprotected files like the ones produced here, usually yes: the bytes are already MP4, so the rename simply tells software the truth. It is not universally safe as a habit, though — renaming never changes codecs, so a player that rejects the stream inside will still reject it after the rename. When you need a guaranteed MP4, convert rather than rename.
No. FairPlay is content protection applied by a content provider before distribution — Apple documents FairPlay Streaming as a technology providers use to encrypt content and key-protect its delivery to Apple devices. A file you encode here has never been through that process, so it plays without any authorisation step. Conversion also cannot remove protection: if you have a protected M4V from a store, no converter will open it.
No. One image is one picture; the encoder holds it for the duration you set and nothing moves. Uploading several PNGs with "Merge images" gives you a slideshow — each still held for the same duration in turn — which is as close to motion as a still-image conversion gets. Real movement needs source frames that differ from one another.
It is flattened onto the Background Color you choose. No mainstream video codec stores an alpha channel, so there is no transparency option to enable — white is preselected, and black is the usual alternative if the clip will play against a dark background. Choose deliberately, because the same colour also fills any bars when your image's shape does not match the frame.
Because still images have no audio to encode, the audio controls are hidden entirely for image sources rather than shown and ignored. The resulting M4V has no audio track at all — not a silent one. Add a soundtrack afterwards in an editor if the destination needs it.
Rarely. H.264 is the default and the one Apple software handles best. MPEG-4 and Xvid are there for legacy pipelines that specifically require them; both are older, less efficient codecs, and they change how the quality controls behave, since neither uses a true CRF scale the way H.264 does. If you want better compression rather than older, HEVC is the direction to go — though not inside an M4V.
Convert it rather than renaming it. M4V to MP4 re-encodes an existing M4V into a container and codec combination that non-Apple players accept. If the file is a protected store purchase, no converter can help — that content only plays in Apple's authorised apps, by design.