Good news - one YouTube successfully loaded, but the other three did not.
There are curious anomalies with all four as detailed in the respective Comments (below).
Questions arising:
1. Why do Youtubes successfully download but audio does not play? (see results below)
2. Why do Youtubes appear to download (listed in Browse Videos) but don’t play? (see results below)
3. Why were there other curious anomalies? (see results below)
4. Are these Youtubes incompatible with BB1 (in which case I’m wasting my time trying to download them) or there is a problem with my BB1?
5. Could someone (Brennan?) test these Youtubes with a BB1 to determine the answer to point 4. above?
6. There seems (currently) to be no way of identifying Youtubes that will / will not download to BB1. Is there any way to identify which YouTubes cannot be downloaded to BB1 or must BB1 owners just accept the frustration of “trial and error”?
7. Every download app I have seen contains a download “indicator” of some sort showing download progress through to completion (progress bar, circle etc) - there is nothing on the BB1 screen or the web UI (the green tick is clearly not a reliable indicator as my testing of these 4 Youtubes clearly demonstrates).
A download progress indicator, either on the BB1 screen or web UI, would be helpful - is this feasible? (Note: this would, of course, not help with Youtubes that download only the video but not the audio)
Incidentally, the previous point raised about the considerably length of some of these Youtubes is, I believe, not relevant for the simple reason that the longest (nearly 2 hours) was previously successfully downloaded and without issue but was of poor quality hence my wish to replace it with a superior and more recent youtube. In fact I have successfully downloaded several feature length movies including one “HD” YouTube with excellent video quality on the BB1 screen (I understand BB1 downloads at the highest possible resolution compatible with the unit).
BB1 dataBB1 connected to router - signal strength -18 dBm
BB1 screens displays date and time and IP address correctly