Hi to all, I need to know the peak bitrate of a Dolby TrueHD audio track. Is there a way/tool to know it? With tools like BDInfo it's possible to know the average bitrate but currently I need to know the peak. :thanks:

To know exactly the peak bitrate you need analyze all the TrueHD frames, I don't know a tool to do this. BTW, you can't expect bitrates greater than the double of the average bitrate. For what need you this?

I need to encode a video for a BD where the TrueHD track was already made. If I know the peak I can set the max bitrate for the video accordingly.

Try putting the TrueHD stream into an mkv and play the file with something that uses the haali splitter, and look at the properties of that filter. It reports bitrate for me, but I don't have an TrueHD streams to try this on.

Take the average bit rate that is already on the file, double it and set that to max. It won't go over it.

Thanks I'll try the suggestion by ramicio. Patmann03: the track is very *huge*, it's about 10 Mbps of TrueHD audio. If I double it to 20 Mbps to be on the safe side, I will cut too much for the video. This is why I need to know the peak... to cut only the necessary.

You can have a max of 54Mbps of data and even then the time sample size isn't strictly defined so I'm sure you could get away with 35Mbps+ for the video.

10 Mbps? Jeez what format is it. The easiest thing to do would be to figure out what the bitrate would be as PCM. Say 6 channel x 48 khz, 24 bit would be 6,912 Kbps. If I compressed that spec. PCM with a lossless codec it would be impossible for the bitrate to ever go over 6,912 Kbps.

It's definitely possible with a poor compression implementation.

You can try using the mediainfo tool to let you know what the bitrate of the video is and what the bitrate of the audio is.