On 06/07/18 14:01, Ralph Corderoy wrote:
BTW, regarding 960x540 25fps being inadequate compared to the
discontinued 1280x720 25fps, a good example is gardening programs with
lots of green leaf in shot, e.g. trees. As the camera pans, the
background `pulses' at about 1 Hz in its updates; there's a drag where
it doesn't update, and then it all updates at one. If a small presenter
walks about in the shot then his face is just skin coloured with no
features until he stops moving and it fills in.
Hi Ralph
It is certainly worth experimenting with different resolutions to get a
feel for the strengths and weaknesses of h.264. I am finding HVFXSD
(960x540p25) is adequate on a 42" screen for a lot of what I watch,
although I do use HVFHD (1280x720p50) for programmes with fine detail.
While I was away and dependent on metered mobile broadband I wanted to
watch Poldark. I decided I could afford 370Mbyte, so I used dvfxhigh
(704x396p25). I was expecting a fuzzy blocky picture, but the results,
again on a 42" screen, were surprisingly good. There was a shot of the
sea and waves which showed some of the effects you describe, but overall
there was much more detail than I was expecting.
For many programmes --audioonly is adequate when constrained by metered
broadband. I have found I can get 128kbit/s from dvfsd. (I want to
avoid 96kbit/s and HE-AAC v1 which is not supported by most of my
devices and 320kbit/s is unnecessary for speech).
What I haven't yet managed to do reliably is to select 128kbit/s for
audio when I am downloading both video and audio.
Best wishes
Richard
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