Audio quality of music is my main concern when downloading from YouTube (and Vimeo, which I only just discovered). But am I wrong or are there relatively few A/V file viewers? Can you recommend a program that displays an audio or video files container (i.e. FLV, MP4, Quicktime, AVI, Matroska, WebM), its audio codec (i.e. AC-3, AAC, ALAC, ALS, FLAC, Vorbis, , TwinVQ, BSAC, MPEG1 thru-4, SLS, Audio Lossless Coding, MPEG-4 DST, H.264/MPEG-4 AVC, Windows Media Audio, Wavpack) and bit rate (from 60 up to at least 192Kbps)? Since transcoding (i.e. file converting) is said to produce somewhat lossy results, I dont require any such viewer software featuring those utilities, other viewer features being equal. Storage space is sufficiently cheap enough for archiving larger HQ or HD files in their original format. Free or not doesnt matter, so long as it reliably displays all popular containers (http://en.wikipedia.org/wiki/Comparison_of_container_formats) , the lossy and lossless audio codecs found in them (http://en.wikipedia.org/wiki/Comparison_of_audio_codecs) and the lowest to the highest bit rates in files found on YouTube, Vimeo and HDTracks.com.