Convert WTV to WMV — Free Online Tool
Convert WTV files — Windows Media Center broadcast recordings — to WMV using the msmpeg4 video codec and wmav2 audio codec, producing a compact Windows Media Video file that plays natively in Windows Media Player and legacy Microsoft applications without additional codecs.
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FFmpeg Command
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Estimated output:
Conversion Complete!
DownloadHow It Works
WTV files recorded by Windows Vista/7 Media Center typically contain H.264 or MJPEG video alongside AAC or MP3 audio wrapped in a proprietary Microsoft DVR container. Converting to WMV requires full re-encoding: the video stream is transcoded from H.264 to the msmpeg4 codec (Microsoft MPEG-4 v3), and the audio is transcoded from AAC to wmav2 (Windows Media Audio v2). Neither stream can be copied directly because the WMV container — based on Microsoft's Advanced Systems Format (ASF) — requires codecs from the Windows Media family. The output is produced with the '-f asf' flag to ensure proper ASF container formatting regardless of the .wmv file extension.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary — the open-source multimedia processing engine that handles decoding the WTV broadcast recording container and re-encoding its streams into the WMV/ASF format. |
-i input.wtv
|
Specifies the input file: a WTV file produced by Windows Media Center, which contains a proprietary DVR container wrapping video (typically H.264 or MJPEG) and audio (typically AAC or MP3) captured from a broadcast tuner. |
-c:v msmpeg4
|
Sets the video codec to msmpeg4 (Microsoft MPEG-4 version 3), the native video codec for WMV files. This triggers a full re-encode of the video stream from the original H.264 or MJPEG source into the older msmpeg4 format required by Windows Media Player and the ASF container. |
-c:a wmav2
|
Sets the audio codec to wmav2 (Windows Media Audio version 2), replacing the AAC or MP3 audio track from the WTV recording. wmav2 is the standard audio codec for WMV files and ensures native playback in Windows Media Player without requiring additional audio decoder installations. |
-b:v 2000k
|
Sets the target video bitrate to 2000 kilobits per second for the msmpeg4 encode. Because msmpeg4 is far less efficient than H.264, this default bitrate is suitable for standard-definition broadcast recordings; HD content from WTV may benefit from increasing this value to 4000k or higher. |
-b:a 128k
|
Sets the audio bitrate to 128 kilobits per second for the wmav2 encode, providing a balance of file size and audio fidelity appropriate for stereo broadcast audio downmixed from the original WTV audio track. |
-f asf
|
Explicitly forces FFmpeg to use the ASF (Advanced Systems Format) muxer, which is the underlying container format for all WMV files. This flag ensures the output is correctly structured for Windows Media Player and other WMV-compatible applications, rather than relying solely on the .wmv file extension for muxer selection. |
output.wmv
|
The name of the output file. The .wmv extension signals that this is a Windows Media Video file using the ASF container, intended for playback in Windows Media Player and compatible legacy Microsoft software. |
Common Use Cases
- Preparing recorded TV broadcasts from Windows Media Center for playback on older Windows XP or Windows 7 systems where WMV/WMA codecs are natively installed but H.264 playback is unreliable.
- Archiving DVR recordings in a format compatible with Windows Movie Maker or older Microsoft video editing tools that accept WMV but not WTV as a source.
- Sharing recorded TV clips with colleagues or family members who use legacy Windows Media Player versions that cannot open the proprietary WTV container.
- Reducing the playback complexity of Media Center recordings by stripping the broadcast-specific container metadata and delivering a straightforward WMV file for embedding in PowerPoint presentations on Windows machines.
- Converting home Media Center recordings for upload to corporate intranet video portals or SharePoint libraries configured to accept WMV streams specifically.
- Repurposing recorded TV content into a format compatible with older WMV-based streaming setups or Windows Media Services installations.
Frequently Asked Questions
Yes — this is a lossy-to-lossy conversion involving two full re-encoding steps. The original WTV recording, already compressed (typically as H.264 video and AAC audio), is decoded and re-encoded into msmpeg4 video and wmav2 audio. Each generation of re-encoding introduces additional quality loss. At the default bitrate of 2000k for video and 128k for audio, the output is generally acceptable for standard-definition recordings, but you may notice softening or blocking artifacts compared to the source WTV file, particularly on high-motion broadcast content.
WMV files are actually ASF (Advanced Systems Format) containers with a different extension — the .wmv extension alone does not always guarantee FFmpeg will select the correct container muxer. The '-f asf' flag explicitly tells FFmpeg to use the ASF muxer, ensuring proper container structure for Windows Media Player and other WMV-compatible software. Omitting this flag could result in a malformed or unplayable output file in some edge cases.
No — the WTV container stores DVR-specific metadata (program title, channel, broadcast time, series information) in proprietary Microsoft recording fields that have no direct equivalent in the ASF/WMV format. Basic metadata like title may partially survive, but broadcast-specific fields are lost during conversion. If preserving this metadata is important, consider extracting it with a tool like MCEBuddy before converting.
Yes — the '-b:v 2000k' flag sets the target video bitrate. For higher quality output, replace 2000k with a larger value such as 4000k, 6000k, or 8000k. For HD recordings originally captured at high bitrates in your WTV file, a higher output bitrate will better preserve detail when re-encoding through the msmpeg4 codec. Keep in mind that msmpeg4 is an older codec and will not match H.264 efficiency at equivalent bitrates, so very high-quality results may require bitrates two to three times higher than the original.
On Windows, you can use a simple batch script: place all your .wtv files in a folder and run 'for %f in (*.wtv) do ffmpeg -i "%f" -c:v msmpeg4 -c:a wmav2 -b:v 2000k -b:a 128k -f asf "%~nf.wmv"'. On Linux or macOS, use 'for f in *.wtv; do ffmpeg -i "$f" -c:v msmpeg4 -c:a wmav2 -b:v 2000k -b:a 128k -f asf "${f%.wtv}.wmv"; done'. The browser-based tool processes one file at a time, so the command-line approach is recommended for large batch jobs.
No — while WTV supports subtitle and closed-caption streams from broadcast recordings, the ASF/WMV container format does not support subtitles. The FFmpeg command as written will not map subtitle streams to the output, and any closed-caption or teletext data in the original WTV file will be silently dropped. If you need subtitles, consider converting to a format like MKV or MP4, which both support subtitle tracks alongside the video content.
Technical Notes
The msmpeg4 codec (Microsoft MPEG-4 version 3) used for WMV output is an older proprietary codec from the early 2000s with significantly lower compression efficiency compared to H.264, which is the typical codec inside a WTV recording. This means that achieving comparable visual quality in WMV requires a substantially higher bitrate — roughly 2–3× more data than an equivalent H.264 encode. The wmav2 audio codec is a well-supported Windows Media Audio format that handles stereo audio cleanly at 128k, but WTV files from broadcast recordings may contain Dolby Digital (AC3) or multi-channel audio tracks; only the first audio track is mapped by default in this command, and multi-channel audio will be downmixed to stereo in the WMV output. The '-f asf' muxer flag is essential because ASF is the underlying container for all WMV files, and without it FFmpeg may not correctly finalize the file header. WMV does not support chapters, and any chapter markers present in the source (though WTV itself does not store chapters) would not be carried through. The conversion is entirely lossy at both the encode and decode stages, so this workflow is best suited for compatibility or distribution purposes rather than archival.