lavf/concat: document the use of the files durations.
Address trac ticket #2319.
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@@ -44,6 +44,12 @@ length.
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All files must have the same streams (same codecs, same time base, etc.).
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All files must have the same streams (same codecs, same time base, etc.).
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The duration of each file is used to adjust the timestamps of the next file:
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if the duration is incorrect (because it was computed using the bit-rate or
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because the file is truncated, for example), it can cause artifacts. The
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@code{duration} directive can be used to override the duration stored in
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each file.
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@subsection Syntax
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@subsection Syntax
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The script is a text file in extended-ASCII, with one directive per line.
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The script is a text file in extended-ASCII, with one directive per line.
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