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manpage: clarify that you can prefetch m3u8 urls 

With the current wording, I thought that playlist-prefetch doesn't
prefetch the next url within a playlist of m3u8 urls, but it makes a big
difference, and I would have enabled it earlier if it wasn't for this
paragraph.

This makes it clear that you can prefetch any file, but that it won't
prefill the cache with the video data. This is true for any video,
there's nothing unique about HLS streams in the behavior of this option.
This commit is contained in:
Guido Cella 2020-12-06 20:49:34 +01:00 committed by Dudemanguy
parent 7db17e627c
commit d4bf179e78
1 changed files with 7 additions and 5 deletions
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12
DOCS/man/options.rst
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@ -3711,15 +3711,17 @@ Demuxer
``--prefetch-playlist=<yes|no>``
Prefetch next playlist entry while playback of the current entry is ending
(default: no). This merely opens the URL of the next playlist entry as soon
as the current URL is fully read.
(default: no).
This does not prefill the cache with the video data of the next URL.
Prefetching video data is supported only for the current playlist entry,
and depends on the demuxer cache settings (on by default). This merely
opens the URL of the next playlist entry as soon the current URL is fully
read.
This does **not** work with URLs resolved by the ``youtube-dl`` wrapper,
and it won't.
This does not affect HLS (``.m3u8`` URLs) - HLS prefetching depends on the
demuxer cache settings and is on by default.
This can give subtly wrong results if per-file options are used, or if
options are changed in the time window between prefetching start and next
file played.