DVR to ASF Converter

DVR to ASF: Out of Media Center's Container and Into a Plain One

There is a detail about this conversion that most pages about it miss: if your .dvr file is a Microsoft DVR-MS recording, it is already an ASF file. DVR-MS is Microsoft's television-recording variant of the Advanced Systems Format, introduced in 2004 for Windows XP Media Center, superseded by WTV alongside the 2008 Media Center TV Pack, and left behind when Media Center was dropped from Windows 10 in 2015. Inside it sits MPEG-2 video with MPEG-1 Layer II or Dolby Digital audio.

So this is ASF to ASF — but it is not a rename and it is not a re-wrap. The server decodes the streams and encodes fresh ones into a clean, ordinary .asf that generic Windows Media tooling opens without the Media Center-specific baggage. The one decision that matters is which video codec goes inside, and it is a genuinely different trade-off here than it is for a modern H.264 source.

What Actually Changes

Two of those rows are the reason people end up here. A DVR-MS file on a modern machine is effectively orphaned — the software that wrote it is gone and the container profile is unusual enough that most tools decline it. A plain ASF is a format everything from VLC to legacy Windows Media Services still understands.

How to Convert DVR to ASF

1. Upload Your DVR Recording: Drag the .dvr or .dvr-ms onto the page or click "+ Add Files". Television recordings are long and this is the slow step; several can be queued and share one set of settings.
2. Choose the Video Codec: Video Codec opens on H.264. Switch it to WMV 2 (or WMV 1) if the destination is Windows Media Player or another Windows Media-era tool — the comparison below shows what that costs. MPEG-2, MPEG-4, Xvid, DivX, VP8, VP9, AV1, Theora, MJPEG and others are also listed.
3. Set Audio Codec and Rate Control: Audio Codec opens on WMA v2, the Windows-native pairing; AC3 and MP2 are there if you want to stay closer to what the recording held. File Compression opens on Quality Preset at "Very High (Recommended)", alongside Constant Bitrate (4 Mbps), Variable Bitrate (4 Mbps target, 2 min, 8 max), Specific file size (24 MB), Constant Quality and Constraint Quality.
4. Trim, Resize and Convert: Trim opens on "Unchanged" and takes a start time and a duration — the quickest way to pull one programme out of a three-hour capture. Video resolution opens on Keep original. Click Convert and download the .asf. Files upload over an encrypted connection, are re-encoded on our servers, and are deleted automatically after a few hours. No sign-up, no watermark.

Choosing the Codec: Compatibility or Size

Both choices produce a valid ASF; we muxed a standard-definition test recording each way and read the results back. The difference is who opens the file and how big it is.

Read those last two rows together. Because the source is MPEG-2 rather than H.264, choosing H.264 here is not the compromise it would be on a camcorder file — it is a real efficiency gain, and it produced a file about two and a half times smaller than WMV 2 in our test. But it also produces an ASF that the Windows Media stack will probably refuse, which defeats the purpose of choosing ASF at all.

The honest recommendation follows from that: pick WMV 2 if the destination is Windows Media software, and accept the size. If the destination is anything else, ASF is the wrong container and DVR to MP4 will serve you better on every axis.

One more thing to watch on WMV: its Quality Preset does not select a quality level, because WMV has no CRF mode. It multiplies the recording's own bitrate — 1.32x at the default "Very High" rung — so a broadcast capture can come out larger than it went in. Use Constant Quality near its opening value of 5, or set Variable Bitrate yourself.

Files That Will Not Convert

Copy-protected recordings. DVR-MS files captured from broadcasts that asserted a copy-protection flag are encrypted to the machine that recorded them. Microsoft's design intent was that they play back only on that device, and no third-party tool decodes them. Most over-the-air recordings are unprotected; pay-TV channels frequently are not.

A .dvr that is not DVR-MS. The bare extension is also used by standalone CCTV recorders, satellite receivers and capture cards for their own formats. If the upload is rejected outright, the recorder used something undocumented — export once from the manufacturer's software and convert that file instead.

A WTV file with the wrong extension. WTV is Microsoft's successor format and is not ASF-based. Windows 7 shipped a wtvconverter.exe that re-wraps unprotected WTV into DVR-MS, after which this page can read it.

Frequently Asked Questions

If DVR-MS is already ASF, why does it need converting at all?

Because it is a specific Media Center profile of ASF, not the general-purpose one. It carries recording-specific structures and, on protected captures, encryption, and the software that understood all of that no longer ships. Writing a fresh, plain ASF gives you a file that ordinary Windows Media tooling and every general video tool can open — at the cost of a full re-encode, since the streams are decoded and re-encoded rather than copied.

Will the conversion be lossless since both are ASF?

No. Every conversion here re-encodes both video and audio. Even choosing MPEG-2 as the output codec re-encodes the MPEG-2 that was already in the file, adding a generation of loss. If preserving the original bits matters, keep the .dvr alongside whatever you produce.

Which audio codec should I pick?

WMA v2 if the destination is Windows Media software — it is preselected and is what an ASF decoder stack expects. Choose AC3 if the recording has a Dolby Digital 5.1 track you want to keep multichannel, or MP2 to stay in the codec family the broadcast used. All three are re-encoded; there is no path that carries the original audio through untouched.

Should I use .asf or .wmv as the extension?

Microsoft's own convention is .wmv when the file holds Windows Media Video, .wma for audio-only, and .asf for anything else. Plenty of software filters on the extension, so if you are choosing WMV 2 as the codec and feeding a Windows tool, DVR to WMV produces the more conventionally named file with the same contents.

Can I split a long recording into individual programmes?

Yes, one at a time. Open Trim, set a start time and a duration, and only that span is encoded — which is also much faster than converting the whole capture. Repeat per programme. For cutting files you have already converted, Video Cutter is the more direct tool.

Does the programme title and description survive?

No. A fresh container is written, so anything Media Center stored as container attributes is not carried into the output. Note down what you need before converting, or rename the output files to carry the information in their filenames.

Will interlacing be cleaned up?

No — there is no deinterlacing stage anywhere in this pipeline. Broadcast television is largely interlaced, and those fields are decoded and re-encoded exactly as recorded. That is correct for playback on a television and shows as comb teeth on horizontal motion when viewed on a computer. Deinterlace deliberately in a desktop editor if the destination is a progressive display.

Why does the output look softer than the recording?

Because MPEG-2 broadcast material is being decoded and re-encoded, and any lossy re-encode of already-lossy video costs something. Raise the quality: Constant Quality at a low number, or Variable Bitrate at a rate at least as high as the broadcast used. Standard-definition broadcast typically ran between 4 and 9 Mbit/s, so a 1 Mbit/s target will visibly soften the picture.

Can I keep MPEG-2 as the output codec?

Yes — MPEG-2 is in the Video Codec list, and choosing it keeps you in the same codec family as the recording. Be aware of two things: it is still a full re-encode rather than a copy, and MPEG-2 inside ASF is an unusual pairing that Windows Media tooling is no more likely to open than H.264. If the goal is to stay on MPEG-2 in a container built for it, DVR to MPG is the better route.

What happens to my uploaded recording?

It is uploaded over an encrypted connection, re-encoded on our servers, and both the upload and the output are deleted automatically after a few hours. No account is needed, no watermark is applied, and nothing is shared or made public.