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vd_lavc: make hwdec fallback more tolerant

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A hw decoder might fail to decode a frame for multiple reasons, and not
always just because decoding is impossible. We can't generally
distinguish these reasons well. Make it more tolerant by accepting
failures of 3 frames, but not more. The threshold can be adjusted by the
repurposed --vd-lavc-software-fallback option.

(This behavior was suggested much earlier in some PR, but at the time
the "proper" hwdec fallback was indistinguishable from decoding error.
With the current situation, "proper" fallback is still instantious.)
This commit is contained in:
wm4
2015-11-03 14:03:02 +01:00
parent 4058b418bf
commit 163c6ad862
3 changed files with 17 additions and 8 deletions
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DOCS/man/options.rst
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@@ -823,9 +823,10 @@ Video
The result is most likely broken decoding, but may also help if the
detected or reported profiles are somehow incorrect.
``--vd-lavc-software-fallback=<yes|no>``
``--vd-lavc-software-fallback=<yes|no|N>``
Fallback to software decoding if the hardware-accelerated decoder fails
(default: yes).
(default: 3). If this is a number, then fallback will be triggered if
N frames fail to decode in a row. 1 is equivalent to ``yes``.
``--vd-lavc-bitexact``
Only use bit-exact algorithms in all decoding steps (for codec testing).