Free online WTV to AAC converter

What the WTV format is

WTV, or Windows Recorded TV, is a Microsoft container created primarily by Windows Media Center when recording digital television. A WTV file can contain video, one or more audio streams, subtitles, and broadcast metadata; its audio may use codecs such as AAC, AC-3, or MPEG audio. You typically encounter WTV files in recordings saved by older Windows Media Center installations or transferred from a Windows TV-recording computer.

What the AAC format is

AAC is a lossy audio codec commonly stored as a raw .aac stream or inside an .m4a container. It provides better quality than MP3 at comparable bit rates and is supported by smartphones, browsers, streaming platforms, and most current media players. Use AAC when the destination accepts it or when you need a compact audio-only copy of a television recording.

How to actually convert WTV to AAC

Using the built-in online converter

You can convert the file for free on the 101convert.com website without installing software. Upload the WTV file, select AAC as the output format, start the conversion, and download the resulting file. Avoid uploading recordings that contain private content or material restricted by copyright.

Using FFmpeg on a computer

FFmpeg handles WTV containers and lets you choose the audio stream, codec, and bit rate precisely.

1. Install FFmpeg from the package source for your operating system and place the WTV file in an accessible folder.
2. Inspect the streams with ffprobe input.wtv. If the recording has multiple audio tracks, identify the required stream index.
3. Extract and encode the first audio stream as an AAC file with:

ffmpeg -i input.wtv -map 0:a:0 -vn -c:a aac -b:a 128k output.aac

-map 0:a:0 selects the first audio stream, -vn excludes video, and -b:a 128k sets the AAC bit rate. Use 192k for higher-quality stereo speech and music, or lower rates when file size matters.

For broader player compatibility, place the AAC stream in an M4A container:

ffmpeg -i input.wtv -map 0:a:0 -vn -c:a aac -b:a 128k output.m4a

If the WTV already contains AAC and you only need a compatible container, check the codec with ffprobe and try stream copying to M4A:

ffmpeg -i input.wtv -map 0:a:0 -vn -c:a copy output.m4a

Stream copying avoids another lossy encoding pass, but it works only when the selected audio codec and container are compatible.

Quality and compatibility

Re-encoding audio from AC-3, MPEG audio, or another lossy source to AAC reduces quality because information discarded during the first encoding cannot be recovered. For spoken television content, 96–128 kbps stereo AAC is usually sufficient; use 160–192 kbps when music or broadcast ambience matters.

Some WTV recordings contain DRM restrictions, damaged indexes, multiple language tracks, or unusual broadcast codecs. FFmpeg may fail to decode protected material, and selecting the wrong stream can produce commentary, an alternate language, or silence. The raw .aac format is less widely recognized than .m4a, so choose M4A when the receiving application does not explicitly request an AAC elementary stream.