![]() Update 1: Emmgunn from mp4tools has gotten back to me and apparently the culprit is the version of ffmpeg that comes with mp4tools and its inability to handle dtshdma audio streams. ![]() No guarantees on when they’ll all be fixed. I’ll try and find some time to fix the existing bad encodes. ![]() Here’s what the audio channels look like in Audacity when encoded properly: I’ve created a bash alias that does the following:įfmpeg -i "$1" -y -vcodec libx264 -crf 18.0 -preset veryslow -vf "scale=852:trunc(ow/a/2)*2" -acodec libfaac -ab 384k -ac 6 -f mp4 "$-480p-HDTN.mp4" means that the output file name should use the original filename, but drop the extension while appending -480p-HDTN.mp4 In the mean time, I’ve been learning and playing with ffmpeg and I’ve come across a set of options that seem to do the trick. Here’s what the 6 channels look like if you open the mp4tools encoded file in Audacity: I’ve already reported the issue to the creator of mp4tools (the utility which I’ve been using to re-encode the raw files). ![]() It has come to our attention that many of our trailers with 5.1 audio were improperly encoded where it only included the left, right, and center channels, omitting the rear-left, rear-right, and subwoofer channels.
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