DVR to OGA Converter

DVR to OGA: Extracting the Soundtrack from a Recording

This is an audio extraction, not a conversion in the usual sense. The video track in your DVR recording is decoded and discarded; only the sound comes out, wrapped in an Ogg container. That makes it useful for pulling a broadcast interview, a lecture, a call-in segment or a piece of music out of something a set-top box or capture card recorded — and it makes one failure mode worth knowing about before you start, because a recording with no audio track does not produce a silent file. It produces no file at all.

What Happens If the Recording Has No Sound

Security DVRs, dashcams and some capture setups record video only. We tested that case deliberately: feeding a video-only recording into an audio target failed with Output file does not contain any stream and wrote nothing to disk. There is no silent .oga and no partial output — the job simply does not complete.

So if this conversion fails on you, check the source first. Open the recording in a player and look for an audio track; if there is none, no audio tool will conjure one. If there is audio but it is silent (a muted microphone, a channel with no signal), the conversion succeeds normally and you get a valid .oga full of silence — which is a different problem with a different fix.

How to Convert DVR to OGA

1. Upload Your DVR File: Drag the .dvr recording onto the page or click "+ Add Files"; several can be queued and each produces its own .oga. The upload validator matches the extension exactly, so a Windows Media Center .wtv recording belongs on WTV to OGA instead. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared or made public.
2. Choose the Audio Codec: The dropdown opens on Vorbis and also offers FLAC, Opus and Speex. Vorbis is the conventional Ogg audio codec and the safe default; Opus is more efficient at low bitrates; FLAC is lossless and much larger. Avoid Speex — see the codec table below.
3. Set the Quality Preset or a Bitrate: File Compression opens on Quality Preset, with seven rungs from Highest to Lowest and no rung preselected — if you leave it alone the server uses the middle of the range. The alternatives are Specific file size, Custom Bitrate (a free-text field opening at 128 kbps) and Constant Bitrate (a fixed list from 8 kbps to 384 kbps, showing 128 kbps).
4. Adjust Channels, Sample Rate or Trim, Then Convert: Audio Channel offers Original, Mono or Stereo — folding a broadcast recording to mono roughly halves the size for speech. Audio Sample Rate offers Original, 8000, 12000, 16000, 24000, 44100 and 48000 Hz. Trim takes a start time and a duration in seconds or HH:MM:SS.sss. Click Convert to download.

The Quality Preset, Translated

Vorbis is a variable-bitrate codec driven by a quality number rather than a bitrate, so each preset maps onto a point on the codec's own −1 to 10 scale. Here is what each rung asks for, with the nominal target the encoder writes into the stream header for 48 kHz stereo:

"Nominal" is doing real work in that heading. Vorbis is genuinely variable, so a quiet or simple recording lands well under its nominal figure and a dense one goes over. For a typical broadcast soundtrack, High (192 kbps) is transparent for music and High or Medium is more than enough for speech.

Which Codec to Put Inside the Ogg

Frequently Asked Questions

What is actually inside a .dvr file?

It depends on what wrote it, which is the awkward part of the extension. The best-known case is Microsoft's Windows Media Center recording, which puts MPEG-2 video and MPEG-1 Layer II or Dolby AC-3 audio inside an ASF container; Microsoft replaced that format with WTV from the Media Center TV Pack in 2008 and dropped Media Center from Windows 10 in 2015. Other set-top boxes, capture cards and security recorders use the same extension for transport streams or their own containers. The conversion identifies the contents by inspecting the file rather than trusting the name, so it works across all of them as long as there is a readable audio track.

Should the file be .oga or .ogg?

RFC 5334 registers .oga, .ogg and .spx for the audio/ogg media type, and gives them different jobs: .ogg is kept for Vorbis-only files for backward compatibility, while .oga is the general audio-Ogg extension for everything else. So if you are leaving the codec on Vorbis, either extension is correct and DVR to OGG is the more conventional filename. If you select Opus or FLAC, .oga is the right choice and .ogg would be misleading.

Will the recording's broadcast audio come through as 5.1 surround?

Only if you keep the channel count. Digital television recordings often carry Dolby AC-3 in 5.1, and Vorbis can hold up to eight channels, so leaving Audio Channel on "Original" preserves the layout. Selecting Mono or Stereo downmixes it. Be aware that a surround Vorbis stream is unusual enough that some players will handle it awkwardly — if the destination is a phone or a podcast app, Stereo is the more practical choice.

Can I extract just one segment rather than the whole recording?

Yes. Set Trim to "Time Range" and enter a Start time and a Duration, either as plain seconds or as HH:MM:SS.sss. That is the right way to pull a single item out of a two-hour capture, and it saves converting the rest. Note that the trim applies to the source timeline, so the numbers are the positions you would see scrubbing the recording in a player.

Why is the extracted audio smaller than I expected?

Because the video is gone. A DVR recording spends the overwhelming majority of its bytes on pictures — an SD MPEG-2 broadcast capture typically runs at several megabits per second of video against a couple of hundred kilobits of audio — so extracting only the soundtrack routinely produces a file one or two percent of the original size. That is the conversion working, not truncation. Check the duration in a player if you want to be sure nothing was cut.

Does changing the sample rate improve anything?

Almost never upward, and sometimes downward. Broadcast audio is normally 48 kHz, and asking for 48000 Hz when it is already 48 kHz avoids a resample entirely — that is what "Original" does. Raising a 32 kHz source to 48 kHz adds bytes and no detail. Dropping to 16 kHz or 24 kHz is a legitimate way to shrink a speech-only recording, especially paired with Mono, but it permanently removes the top of the frequency range.

Can I play an .oga file on a phone?

On Android, generally yes — Ogg Vorbis has been supported since early versions. On iOS, not natively: Apple's built-in players do not handle Ogg containers, so you need a third-party app such as VLC. If the destination is an iPhone, DVR to MP3 is the pragmatic choice, and DVR to FLAC is the lossless one if you plan to re-encode later.

Is the audio re-encoded even if the source is already Vorbis?

Yes. Every conversion here decodes the source and re-encodes it — there is no stream-copy path — so a Vorbis-in-DVR source would be decoded to samples and encoded again, which costs a generation of quality. That is very unlikely to be your situation with a DVR recording (they carry MPEG audio or AC-3, not Vorbis), but it is worth knowing if you are chaining conversions: each pass through a lossy codec compounds, so go from the original recording to your final format in one step.

Does anything from the recording's metadata carry over?

Very little. Programme titles, channel information and electronic-programme-guide data live in container-specific structures that have no equivalent in an Ogg audio stream, so they are not carried across. The output is a plain audio file with the codec's own headers and nothing else. If you need that information, note it down before converting or keep the original recording alongside the extract.