I have the following setup in VSE, it's a mosaic of 4 video files, 2 with sound:
When I render the output video and play it in VLC, in Media Information (ctrl + J) it says that it contains an audio stream, but no sound is played.
I've checked a few things in the Properties panel. In Post Processing, Sequencer is enabled. In Output, I tried a few different Movie file formats, clicking on RGB when required. In Encoding, I tried a few different Formats and Audio Codecs, and the Volume is at 1. In the Scene tab, in Audio, I tried with volume at 1 and 100. In the VSE, the strips are not muted. I've checked the file paths.
I've tried on Blender 2.78c on Windows 7 x64 and on 2.78a on Debian 9. I don't know what else to try.
Thanks in advance.