Free online OGV to ASF converter

Some older Windows Media applications and devices accept ASF but do not open OGV, so the video must be remuxed or re-encoded before use. Converting locally with FFmpeg preserves control over codecs, bitrate, resolution, and privacy; 101convert.com can also perform the conversion online without installing software.

What the OGV format is

OGV is a video file built around the Ogg container, commonly containing Theora video and Vorbis audio. It appears in open-source software, older web video workflows, screencasts, and media archives; FFmpeg, VLC, and some Linux video editors can create or export it.

OGV identifies the container rather than one mandatory codec. Before converting, inspect the streams with ffprobe -hide_banner input.ogv; this shows the video codec, audio codec, frame rate, dimensions, and duration.

What the ASF format is

ASF, or Advanced Systems Format, is a Microsoft multimedia container intended for streaming and playback in older Windows Media software. It commonly carries WMV video and WMA audio, supports timestamps, metadata, indexing, and streaming-oriented packetization, and uses the .asf extension.

ASF is useful when a legacy Windows application, media server, or hardware player specifically requires an ASF or Windows Media file. Modern players generally provide better support for MP4, while ASF compatibility is strongest when the file contains WMV-compatible video and WMA-compatible audio.

How to actually convert OGV to ASF

Using FFmpeg

1. Install FFmpeg and place the source file in a convenient folder.
2. Run this command, replacing the filenames and adjusting the bitrates if needed:

ffmpeg -i input.ogv -c:v wmv2 -b:v 1500k -c:a wmav2 -b:a 128k output.asf

This decodes the OGV streams and encodes WMV2 video and WMA2 audio inside an ASF container. For a smaller file, lower -b:v; for better visual quality, raise it. To preserve the source dimensions and frame rate, do not add scaling or frame-rate options.

If the source has no audio, use ffmpeg -i input.ogv -c:v wmv2 -b:v 1500k -an output.asf. If the target application accepts the original codecs, a stream copy may avoid quality loss, but it is less compatible: ffmpeg -i input.ogv -c copy output.asf can fail or produce a file that older ASF players cannot decode.

Using the online converter

On 101convert.com, choose the video converter, upload the OGV file, select ASF as the output format, start the conversion, and download the resulting file. Online conversion avoids software installation, but local FFmpeg is preferable for confidential videos or files that exceed the website's upload limits.

Quality, compatibility, and limitations

Re-encoding from Theora to WMV2 is lossy, so the ASF cannot improve the source quality. Match the source resolution and frame rate, and choose a video bitrate appropriate for the content; fast motion usually needs more bitrate than slides or talking-head footage.

ASF is a container, not a single codec specification. Some programs accept only particular Windows Media profiles, such as WMV9 rather than WMV2, or reject WMA audio. If WMV2 is not accepted, try a compatible encoder available in the installed FFmpeg build, then test the output in the exact target application.

Check the result with ffprobe output.asf or the target player. Subtitles, multiple audio tracks, chapters, and unusual OGV metadata may not transfer reliably, and embedded subtitles often need to be burned into the video or exported separately.