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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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1 changed files with 5 additions and 2 deletions
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DOCS/man/options.rst
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@ -476,7 +476,8 @@ Playback Control
created seek ranges may not join, because not enough overlap is achieved. created seek ranges may not join, because not enough overlap is achieved.
- Trying to use this with hardware video decoding will probably exhaust all - 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 - Stream recording is broken. ``--stream-record`` may keep working if you
backward play within a cached region only. backward play within a cached region only.
@ -498,7 +499,9 @@ Playback Control
- Increasing ``--video-reversal-buffer`` might help if reversal queue - Increasing ``--video-reversal-buffer`` might help if reversal queue
overflow is reported, which may happen in high bitrate video, or video 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, - The demuxer cache is essential for backward demuxing. If it's too small,
a queue overflow will be logged, and backward playback cannot continue, a queue overflow will be logged, and backward playback cannot continue,