Re: Most useful DVD burning format
I don't quite understand the question, but I'll try to answer.
Firstly, yes, you can burn photos, documents, or music to DVD+-R. Ashampoo Burning Studio is good for that.
For converting and burning avis, mkvs, mp4s (or any video format) to DVD, I have used ConvertXtoDVD (latest version is 6) for years. It converts the video file to IFO and burns to disc as well. It has plenty of options for merging video files, deinterlacing, adding soft subtitles (srt or idx), etc., etc. IMGBurn is an excellent alternative IFO-to-ISO-to-DVD-R burner, but not needed if you have ConvertX.
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