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Don't use the ffmpeg concat filter when only one audio segment

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The concat filter requires at least 2 segments, it doesn't support
the degenerate case.
This commit is contained in:
Calvin Walton 2014-08-22 16:41:16 -04:00
parent 0841dd4233
commit d53e7d21f3
1 changed files with 9 additions and 4 deletions
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13
record-and-playback/core/lib/recordandplayback/edl/audio.rb
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@ -127,10 +127,15 @@ module BigBlueButton
end
ffmpeg_filter = ffmpeg_filters.join(' ; ')
# Add the final concat filter
ffmpeg_filter << " ; "
(0...output_index).each { |i| ffmpeg_filter << "[out#{i}]" }
ffmpeg_filter << " concat=n=#{output_index}:a=1:v=0"
if output_index > 1
# Add the final concat filter
ffmpeg_filter << " ; "
(0...output_index).each { |i| ffmpeg_filter << "[out#{i}]" }
ffmpeg_filter << " concat=n=#{output_index}:a=1:v=0"
else
# Only one input, no need for concat filter
ffmpeg_filter << " ; [out#{i}] anull"
end
ffmpeg_cmd += ['-filter_complex', ffmpeg_filter]