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manpage: another comment on backward playback with hardware decoding

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wm4 2019-05-31 20:13:57 +02:00
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7
DOCS/man/options.rst
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@ -478,7 +478,8 @@ Playback Control
created seek ranges may not join, because not enough overlap is achieved.
- Trying to use this with hardware video decoding will probably exhaust all
your GPU memory and then crash a thing or two.
your GPU memory and then crash a thing or two. Or it will fail because
``--hwdec-extra-frames`` will certainly be set too low.
- Stream recording is broken. ``--stream-record`` may keep working if you
backward play within a cached region only.
@ -500,7 +501,9 @@ Playback Control
- Increasing ``--video-reversal-buffer`` might help if reversal queue
overflow is reported, which may happen in high bitrate video, or video
with large GOP.
with large GOP. Hardware decoding mostly ignores this, and you need to
increase ``--hwdec-extra-frames`` instead (until you get playback without
logged errors).
- The demuxer cache is essential for backward demuxing. If it's too small,
a queue overflow will be logged, and backward playback cannot continue,