Step 1: Add your M4V files using the button above or by carry and plop.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Pull your converted WMV files.
M4V to WMV Conversion FAQ
How do I re-encode M4V to WMV without quality loss?
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Upload your M4V file and our converter applies a CRF-based re-encode targeting visually-lossless WMV output (CRF 18 by default, lower = larger / higher quality). The codec is chosen to match the WMV container (H.264 / H.265 / VP9 / AV1 as appropriate).
Which codec does the WMV output use?
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It depends on the container. MP4 defaults to H.264 (broadest playback support); MKV and WebM default to H.265 and VP9 respectively for better compression at the same quality. You can override codec choice in the advanced options before conversion.
Will my audio track survive M4V to WMV conversion?
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Yes — audio is re-muxed (when M4V and WMV share an audio codec) or re-encoded to AAC / Opus / Vorbis depending on what the WMV container supports. Multi-track audio (commentary, alternate languages) is preserved.
Can I keep the original framerate when converting M4V to WMV?
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By default, framerate is unchanged (M4V 24fps stays 24fps in WMV). If you need to change it (e.g. interlaced 29.97 → progressive 30fps), use the framerate option, which handles 3:2 pulldown and deinterlacing in the same pass.
What is the file size difference between M4V and WMV?
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Same-codec re-muxes (e.g. M4V → WMV where both use H.264) produce nearly-identical sizes. Codec changes can swing the size dramatically: H.264 → H.265 typically halves the file at the same visual quality; H.264 → VP9 is roughly comparable.
Will the WMV file play on iPhone / Android / Smart TV?
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MP4 / H.264 plays natively everywhere. MOV / H.264 plays on Apple devices and most Smart TVs but not on older Android. MKV needs VLC on iOS. The advanced options include a "device compatibility" preset that picks the safest codec / container combination for the target device.
How long does converting a 1-hour M4V file to WMV take?
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It depends on the codec change. Same-codec re-mux: 30-60 seconds (no re-encode). Re-encode to a different codec: typically 0.3-0.7x source duration on our GPU pipeline, so a 1-hour file finishes in 18-40 minutes.
What is the max resolution supported for M4V to WMV?
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Up to 8K (7680×4320) on Premium. Free users are capped at 4K (3840×2160) per the file-size limit. HDR metadata (HDR10, Dolby Vision) is preserved where both M4V and WMV containers support it.
Is my M4V video private during conversion?
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Yes — uploaded video files are processed in isolated workers and deleted within minutes of completion. We never view, store, retain, or share content. See /privacy/ for the full data retention window.
Can I crop or trim during the M4V to WMV conversion?
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Not in the same step — use /video-trim/ or /video-cutter/ to trim before converting, then queue the M4V → WMV step. Trimming and converting in series is faster than re-encoding the whole file just to crop.
Why is the WMV file blurry / pixelated compared to the M4V source?
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Almost always a bitrate-too-low setting. Re-encoding from a high-bitrate M4V into a lower-bitrate WMV at the default CRF compresses heavily on motion-heavy scenes. Push CRF down to 16-18 (or set explicit bitrate) and re-run to recover quality.
Does the M4V to WMV converter support subtitles?
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Yes — embedded subtitle tracks (mov_text in MP4, SRT/ASS in MKV) are preserved when both M4V and WMV containers support them. Burned-in (hardsub) subtitles transfer automatically because they are part of the video frame.
