Free online TS to WEBM converter

Some websites, web players, and publishing systems accept WebM but reject MPEG transport stream files, so recorded or broadcast video in TS format must be converted before upload. WebM can provide a browser-friendly distribution copy, although producing it usually requires re-encoding the video and audio.

What the TS format is

TS, or MPEG transport stream, is a container designed to carry video, audio, subtitles, metadata, and sometimes multiple programs in fixed-size packets. Its structure supports continuous delivery over networks and broadcast systems where transmission errors can occur.

Digital television, DVB and ATSC broadcasts, IPTV systems, capture software, some cameras, and some surveillance systems commonly create .ts files. Blu-ray uses the closely related M2TS transport-stream variant. The .ts extension identifies the container, not the codecs inside it; a file may contain MPEG-2, H.264/AVC, or H.265/HEVC video and AAC, AC-3, or other audio.

What the WEBM format is

WebM is an open media container designed mainly for web video. Common combinations are VP8 or VP9 video with Vorbis or Opus audio; AV1 video is also supported in current WebM workflows.

WebM works with HTML5 video and current Chromium-, Firefox-, and Safari-based browsers, but support varies by browser version, operating system, and codec. VP9 and AV1 can produce smaller files than MPEG-2 TS at comparable visual quality, but the result depends on the source, encoder, resolution, frame rate, and quality setting. WebM is less suitable for broadcast delivery, optical-disc authoring, and applications that specifically require MP4 or a production container.

Convert with 101convert

You can convert the file for free on 101convert without installing software:

1. Open the TS to WEBM converter on 101convert.
2. Upload the .ts file.
3. Select WEBM as the output format and start the conversion.
4. Download the resulting .webm file and test it in the intended browser or player.

For confidential recordings, check the service's current file-handling and size limits before uploading.

Convert with FFmpeg

FFmpeg provides more control over codecs, quality, resolution, and selected streams. Install an FFmpeg build for Windows, macOS, or Linux, open a terminal in the folder containing the source file, and run:

ffmpeg -i input.ts -map 0:v:0 -map 0:a:0? -c:v libvpx-vp9 -crf 32 -b:v 0 -c:a libopus -b:a 128k output.webm

This encodes the first video stream as VP9 and the first audio stream as Opus. In libvpx-vp9, -b:v 0 enables constant-quality mode and -crf controls the quality-size trade-off: a lower value such as 24 generally gives higher quality and a larger file, while a higher value such as 36 generally gives lower quality and a smaller file. The best value depends on the source.

To limit output width to 1280 pixels while preserving the aspect ratio, add a scale filter:

ffmpeg -i input.ts -map 0:v:0 -map 0:a:0? -vf "scale='min(1280,iw)':-2" -c:v libvpx-vp9 -crf 32 -b:v 0 -c:a libopus -b:a 128k output.webm

For compatible source streams, stream copying avoids re-encoding and therefore avoids additional quality loss:

ffmpeg -i input.ts -map 0:v:0 -map 0:a:0? -c copy output.webm

Stream copying works only when the source codecs and stream layout are accepted by the WebM container, such as VP8, VP9, or AV1 video with Vorbis or Opus audio. It normally fails for common TS combinations such as H.264 with AAC or AC-3; re-encode those streams with the VP9/Opus command. Explicit mapping selects the first video and audio tracks instead of copying every program, subtitle, or data stream from a multi-program TS file.

Quality and compatibility limits

Re-encoding cannot restore detail lost in the TS source. Keep the original TS as the archive and use WebM as a distribution copy; repeated conversions cause further quality loss.

Interlaced television footage may need deinterlacing because web playback usually targets progressive video. Add yadif before scaling when necessary, for example -vf "yadif,scale='min(1280,iw)':-2". Deinterlacing changes the picture and should not be applied to progressive footage.

TS may contain subtitles, alternate audio tracks, broadcast metadata, and multiple programs that WebM cannot preserve in the same form. Select or convert those elements separately when required. Check the output with ffprobe output.webm or by opening it in the target browser, especially when the file uses AV1, uncommon audio, subtitles, or high-resolution video.