Free online ASF to TRP converter

Some DVRs, set-top boxes, and older video editors accept MPEG transport streams with a .trp extension but cannot read Microsoft ASF files. Converting the container and, when necessary, the codecs makes the recording usable on those devices.

What the ASF format is

ASF, or Advanced Systems Format, is a Microsoft multimedia container designed for streaming and indexed playback. It commonly contains Windows Media Video (WMV) and Windows Media Audio (WMA), along with metadata, timestamps, and error-recovery information.

Windows Media Player, older Microsoft capture software, Windows-based screen recorders, and some broadcast or surveillance systems create ASF files. Files may use the .asf extension directly, although WMV files also use the ASF container family.

What the TRP format is

TRP usually denotes an MPEG-2 transport stream saved with a .trp extension. Digital video recorders, satellite receivers, cable boxes, and set-top boxes use it to store television recordings and multiplex video, audio, program information, and timing data.

TRP is useful when hardware expects transport-stream packets rather than an ASF container. The extension alone does not define the codecs: many devices expect MPEG-2 video with MPEG audio, while others accept H.264 and AAC. Device documentation determines the required combination.

How to actually convert ASF to TRP

FFmpeg is the most controllable desktop option. It reads ASF, decodes Windows Media streams, encodes widely compatible MPEG-2 video and MP2 audio, and writes an MPEG transport stream with the requested extension.

1. Install FFmpeg and place the source file in a working folder.
2. Run this command, replacing the filenames as needed:
   

   ffmpeg -i input.asf -map 0:v:0 -map 0:a:0? -c:v mpeg2video -q:v 3 -c:a mp2 -b:a 192k -f mpegts output.trp

3. Check that output.trp plays in a transport-stream player and test it on the target recorder or receiver.

The command selects the first video and first audio stream, encodes video as MPEG-2, encodes audio as MP2, and uses the MPEG-TS muxer. A lower -q:v value increases MPEG-2 quality and file size; values around 2–5 are commonly suitable for archival or device playback.

Inspect the input before converting with:

ffprobe input.asf

If the target device accepts the existing codecs, a faster conversion may avoid re-encoding:

ffmpeg -i input.asf -map 0:v:0 -map 0:a:0? -c copy -f mpegts output.trp

Use stream copying only when the device supports those codecs and the ASF streams can be placed in an MPEG transport stream without compatibility problems.

For a no-installation conversion, upload the ASF file to the free converter on 101convert.com, select TRP as the output format, start the conversion, and download the resulting file.

Quality, compatibility, and limitations

Re-encoding ASF video to MPEG-2 reduces quality compared with the source and increases the file size; stream copying avoids that loss but often produces a TRP that older hardware cannot decode.

Some receivers require fixed video dimensions, frame rates, bitrates, audio sample rates, or MPEG-TS packet settings. If a generated file is rejected, consult the device specification and adjust FFmpeg options such as -s, -r, -b:v, -ar, and -ac. DRM-protected ASF content may not decode unless the required license and playback support are available.