Don't bother decoding audio if none of it is mapped (#2809).

[dcpomatic.git] / src / lib / ffmpeg_decoder.cc

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index 6130d8e5fb5c59be98c6aec9c6ed7b78e23eeac1..e0d9918b207856e4e70b44a39d4e34f318be3990 100644 (file)
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -89,7 +89,7 @@ FFmpegDecoder::FFmpegDecoder (shared_ptr<const Film> film, shared_ptr<const FFmp
                _pts_offset = {};
        }
 
-       if (c->audio) {
+       if (c->audio && !c->audio->mapping().mapped_output_channels().empty()) {
                audio = make_shared<AudioDecoder>(this, c->audio, fast);
        }
 
@@ -240,7 +240,7 @@ FFmpegDecoder::pass ()
                decode_and_process_video_packet (packet);
        } else if (fc->subtitle_stream() && fc->subtitle_stream()->uses_index(_format_context, si) && !only_text()->ignore()) {
                decode_and_process_subtitle_packet (packet);
-       } else {
+       } else if (audio) {
                decode_and_process_audio_packet (packet);
        }