Huge overhead with TrueHD muxing

[lithiumus]

I've been playing around and testing TrueHD audio streams and found that there is a huge penalty with overhead when muxing it back with video.

I have found that there is almost a 40% or more overhead when using TrueHD. Anyone else see this as well? I don't believe DTS-HD HR has the same overhead but maybe DTS-HD MA does... I can't remember what those test results were...

[lithiumus]

I performed a bit more testing and have found that the m2ts overhead when muxing in a TrueHD is actually more than I originally estimated.

When I tested muxing a 1.6Gb TrueHD 5.1 Audio stream, the result was a 2.6Gb m2ts file.

That is approx. a 62% filesize increase. Almost 1gb on a base of 1.6gb. I'm going to do some DTS-HD HR/MA overhead testing and compare the them to TrueHD.

[nautilus7]

You obviously do something wrong. What application did you use for muxing and how did you demuxed the truehd stream (from a blu-ray, i suppose)?

[lithiumus]

Demuxed with tsmuxer from Blu-Ray m2ts and remuxed with tsmuxer -> tsremux

I was having issues with an older version of eac3to with THD streams so I haven't tried it again since.

[lithiumus]

Maybe tsmuxer is doing something strange but the audio plays fine and there are no issues after muxing so I just assumed this is what is to be expected. It didn't seem to make a lot of sense to me either.

[2themax]

You aren't doing anything wrong surprisingly. TrueHD does need a ridiculous amount of overhead. In general, I just double the raw TrueHD's file size to estimate the size it will be on the disc. I then use that to get an average bitrate for the video.

[frogman]

Has Dolby Digital license out a TrueHD encoder for Windows that outputs .thd tracks 7.1 for non professionals. IE audio hobbyist. Just for comparison on overhead from open source tools?