MTS files

[PKelly]

Is it possible to convert the audio only on an MTS video and retain the video quality?

[Ennio]

Yes. Surely there are all-in-one solutions, but I always demux mts into elementary streams with tsMuxer. Then use an audio-editor like Audacity or eac3to (with UsEac3To as GUI) to recode audio. Import the result together with the native videostream in tsMuxer and mux back to ts or m2ts.

[PKelly]

Thanks Ennio, you're obviously more adept than I, I have tsMuxer but unsure as to what settings to use. I have a projector that doesn't recognise the dolby audio files that come with MTS video but plays the video. I'm trying to keep the quality of the video and change the audio to mp3.

I have audacity too but don't think I can follow your instructions to blend the files.

[Alwyn]

AVIDemux.

Set Video to Copy

Set Audio and Output format as desired.

[ProWo]

Use clever FFmpeg-GUI.
Load your mts, click main. click encode audiostream, select your audiostream (if there are several), click >>>, select the desired encoder, click encode.


[Attachment 74637 - Click to enlarge]

If done, click multiplex, the new encoded audiostream is shown in green, set it and the videostream (and other desired streams), set m2ts as container, click multiplex.


[Attachment 74638 - Click to enlarge]

Done.

[PKelly]

I've managed to convert the audio, guys, thank you. Now how do I keep the video format in 16:9 as its turned a bit square?

[ProWo]

I've managed to convert the audio, guys, thank you. Now how do I keep the video format in 16:9 as its turned a bit square?

[Attachment 74639 - Click to enlarge]

No recode, just streamcopy, so no quality loss.

[Alwyn]

I've managed to convert the audio, guys, thank you. Now how do I keep the video format in 16:9 as its turned a bit square?

What program did you use convert your file?

[PKelly]

I used both for two different files. I have to say I found Avidemux the easier of the two. The files seem to be fine on the computer but look a bit square on the projector.

[Alwyn]

Try: in AVIDemux, under the Output Format, choose MP4 then click Configure and tick "force 16:9".

[PKelly]

Will that not convert the video to mp4? I'm trying to avoid that to retain the quality of the MTS file, just the audio I needed to change.

[Alwyn]

In the example MTS files I have here, the video codec is AVC/H264, which can also reside in the MP4 container. So when you do a "Copy" on the video part, there's no conversion going on; basically all that is happening, video-wise, is the container is being changed from MTS to MP4. The underlying video stays as AVC/H264. You can observe the underlying video codec by opening your MTS in Mediainfo.

[rgr]

Is it possible to convert the audio only on an MTS video and retain the video quality?

Use ffmpeg:

ffmpeg.exe -i input.mts -c:v copy -c:a aac -b:a 192k output.mts