Convert WMV to AAC Online

Microsoft Lync (launched 2010, rebranded as Skype for Business in 2015) and earlier Microsoft Teams versions used WMV as the default recording format on Windows because WMV is the native Windows Media format requiring no additional codecs in corporate Windows environments. Local meeting recordings from Lync 2013, Skype for Business 2015 and 2016, and Office Communications Server recordings are saved in WMV with WMA audio. Microsoft Teams switched to MP4 with cloud recording from 2020 onward, but organizations with legacy recordings from the Lync/Skype for Business era still have WMV files they need to convert for playback on Apple devices or macOS.

WMA (Windows Media Audio) is Microsoft's proprietary audio codec introduced in 1999. There are three main variants: WMA Standard (WMA 2, most common in WMV recordings, operates at 32–192 kbps), WMA Professional (WMA Pro, supports up to 7.1 channels and 24-bit, rare in meeting recordings but present in professionally produced content with Windows Media Encoder), and WMA Lossless (lossless, very rare in WMV). FFmpeg decodes all three variants via libavcodec and re-encodes to AAC-LC via FFmpeg's native AAC encoder or libfdk-aac. For meeting voice recordings (WMA at 64–128 kbps), the resulting AAC at 128 kbps offers more than sufficient quality. For musical content in WMA Pro, higher AAC quality (192–256 kbps) is recommended.

Yes, and it's one of the most common uses of WMV-to-AAC in enterprise environments. Learning & Development departments at large corporations often have libraries of WMV training videos produced between 2005 and 2018 using Windows Media Encoder, Camtasia (which exported WMV by default through version 8), or Microsoft Office's video editor. Extracting audio from these recordings and converting to AAC allows distributing them as corporate podcasts on Apple Podcasts for Organizations, uploading to LMS platforms like Cornerstone, SAP Litmos, or Docebo that accept AAC but not WMV, and importing into Adobe Audition or Logic Pro for further editing.

Apple has never included native support for WMV/WMA in iOS, iPadOS, or QuickTime for macOS. Microsoft distributed a QuickTime plugin called 'Flip4Mac WMV' (now 'Telestream Flip4Mac') that allowed WMV playback in macOS QuickTime Player, but this plugin doesn't work on iOS and was discontinued for macOS starting with macOS Catalina (2019) due to 64-bit architecture incompatibilities. On iPhone and iPad, no third-party app plays WMV natively without a conversion server. The only solution for having WMV audio in the Apple ecosystem is converting to AAC (for audio), MP4/H.264 (for video), or MOV.

Lync/Skype for Business meeting recordings typically use WMA at 64–128 kbps in mono or stereo. Converting to AAC-LC at 128 kbps stereo produces quality fully adequate for use as training material or corporate podcast. Human voice recorded in a meeting room (typically through a room microphone or laptop's internal microphone) rarely exceeds 4 kHz in relevant frequency content, so even AAC at 96 kbps would be perceptually transparent for this type of content. If the WMV contains presentations with mixed voice and music audio, maintaining AAC encoding at 128–192 kbps is recommended to preserve musical quality.

Yes. Windows Movie Maker (available in Windows XP, Vista, 7, and 8, discontinued in 2017) exported videos in WMV by default, as did Microsoft Expression Encoder (Microsoft's professional video encoding tool for SharePoint and Silverlight, discontinued in 2012). WMV files produced with both tools use WMA Standard as the audio codec and are fully compatible with Convertir.ai's FFmpeg conversion. Also compatible are WMV files generated by: Windows Media Encoder 9 (discontinued in 2006 but with millions of files still in circulation), Camtasia Studio 1–8 (Microsoft Partners until 2013), and the WMV exporter in Adobe Premiere Elements for Windows.