cnv = extract_playlist(cnt)
    ext = cnv.probe_ext(url)
    probe = cnv.probe_fmt()

    # Check ambiguity (except pseudo extension)
    if len(set([source, mime, probe])) > 1:
        log.WARN("Possible playlist format mismatch:", "listformat={}, http_mime={}, rx_probe={}, ext={}".format(source, mime, probe, ext))
#        log.DATA(cnt)

    # Extract URLs from content
    for fmt in playlist_fmt_prio:
        if not urls and fmt in (source, mime, probe, ext, "raw"):
            urls = cnv.urls(fmt)
            urls = filter(None, urls)
            log.DATA("conversion from:", source, " with extractor:", fmt, "got URLs=", urls)