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lavfi: detect merge failure for unknown layouts.

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Detect when filtering known layouts from an explicit list
results in an empty list.

Fix erratic behavior.
This commit is contained in:
Nicolas George 2013-03-14 21:54:48 +01:00
parent 7d05751581
commit f810ca63f8
1 changed files with 4 additions and 0 deletions
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4
libavfilter/formats.c
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@ -184,6 +184,10 @@ AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
for (i = j = 0; i < b->nb_channel_layouts; i++)
if (KNOWN(b->channel_layouts[i]))
b->channel_layouts[j++] = b->channel_layouts[i];
/* Not optimal: the unknown layouts of b may become known after
another merge. */
if (!j)
return NULL;
b->nb_channel_layouts = j;
}
MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);