Step 1: Provide your M4V files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted WMV files.
M4V to WMV Conversion FAQ
How do I convert M4V to WMV without re-encoding the video stream?
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When the M4V and WMV containers can both carry the same codec (H.264, H.265, VP9, AV1), the converter falls back to a remux: the elementary streams are copied byte-for-byte into the WMV container and only the wrapper changes. A remux of a 1 GB M4V into WMV typically finishes in 5-15 seconds with zero quality loss. Structurally an M4V is an MP4 — H.264 or HEVC with AAC — with optional Apple FairPlay DRM and iTunes chapter metadata. WMV carries Microsoft’s own VC-1 or WMV3 video with WMA audio — codecs almost nothing outside Windows decodes natively.
What happens to the subtitle tracks in my M4V file?
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They cannot stay selectable, because WMV has no soft-subtitle stream to hold them. There are two ways out: burn them into the video during conversion, which makes them permanent and unstyleable, or export them as a separate .srt alongside the WMV for the player to load. The converter tells you which it did rather than dropping them silently. WMV is effectively a dead end: macOS, iOS, Android and every browser need third-party decoders, and some WMV files carry DRM that cannot be converted at all.
My M4V has several audio tracks — do they all survive into the WMV?
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Not dependably. M4V stores multiple audio streams as first-class tracks, but WMV playback support past the first track is inconsistent, so most players will only ever expose one. Choose the track you actually want before converting; the others are better extracted to their own files than left in a container that hides them. M4V keeps chapter markers, artwork and subtitle tracks in the shape the Apple TV app expects, which plain MP4 often loses.
Why does my M4V file fail to convert to WMV?
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Almost always DRM. Some M4V files are encrypted at the bitstream level by the store or software that issued them, and an encrypted stream cannot be decoded by us or by anything else without the licence key. Files you recorded, exported or downloaded unprotected convert normally; a licensed purchase will not, and no converter can honestly promise otherwise. DRM-protected M4V purchases cannot be converted by anything; only unprotected M4V files are convertible, and non-Apple players often need the extension renamed.
Will the WMV still play smoothly on a phone or a TV?
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It may not. M4V is decoded by dedicated silicon on phones, tablets and TVs, which is why it plays without flattening the battery. WMV typically falls back to software decoding on the same hardware — higher CPU load, a warmer device, and dropped frames on 4K material. For a device target, M4V is the safer container to stay in.
Why would I convert M4V to an older format like WMV?
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Because a lot of hardware never learned anything newer and never will. DVD players, in-car head units, camcorder playback modes, industrial displays and plenty of broadcast ingest equipment accept WMV and nothing else. The conversion is a deliberate step down in efficiency, bought in exchange for working on a device that has no other option. WMV compresses well for its age and remains the format PowerPoint, older Windows screen recorders and corporate media libraries expect.
Will multi-track audio survive M4V to WMV conversion?
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Yes — every audio track in the M4V (director commentary, alternate languages, descriptive audio) is preserved in the WMV when the target container supports multi-stream audio. MKV and MOV handle unlimited audio tracks; MP4 supports many but some hardware players only see track 1; WebM is capped at one Opus / Vorbis track. WMV is Windows Media Video, Microsoft’s ASF-based format from the Windows XP era.
Are subtitle tracks preserved when converting M4V to WMV?
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Soft subtitles (selectable tracks) survive when WMV can carry them: MKV holds SRT, ASS, SSA, PGS, VobSub natively; MP4 only holds mov_text (a stripped-down format). Converting an MKV with ASS styled subs to MP4 will typically downgrade them to mov_text or burn them in. Hardsubs (burned into the video) carry over regardless.
Does M4V to WMV keep chapter markers / DVD-style navigation?
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Chapter metadata transfers between M4V and WMV whenever both containers support a chapter atom (MKV, MP4, MOV). WebM stores chapters in a Matroska-compatible block, so MKV <-> WebM chapters round-trip cleanly. AVI has no chapter spec at all, so an AVI source arrives with no chapters to carry across and an AVI target cannot store the ones it was handed; add markers manually afterwards if you need them.
What about MKV attachments (fonts, cover art) when going M4V to WMV?
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MKV is the only mainstream container that stores arbitrary attached files (TTF fonts for ASS subs, JPG cover art, fan-translated PDF inserts). Going from M4V to WMV drops these attachments when WMV is not MKV — the elementary streams convert, but the attached payload stays in the source. Keep M4V as a backup if you depend on attached fonts.
Which codec does the WMV output use by default?
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The default codec is chosen to match the WMV container conservatively: MKV defaults to H.265 (HEVC) for better compression; MP4 defaults to H.264 for the widest device support; WebM defaults to VP9; AVI uses MPEG-4 ASP (DivX/Xvid lineage). Override via the advanced codec dropdown — AV1 is available for MKV / WebM where you want maximum compression and can wait through the encode.
How does HDR (HDR10, Dolby Vision) survive M4V to WMV?
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HDR static metadata (HDR10 mastering display values, max content light level) carries through to WMV when both containers and the chosen codec support it (HEVC, AV1 in MKV / MP4). Dolby Vision is more fragile — DV profile 5 / 7 / 8.1 in M4V commonly survives only into MKV with HEVC; converting to a WMV container that does not carry the DV layer flattens to HDR10.
