Mediainfo and MKV files

[thezanny]

I've seen that .mkv can be used for almost all types of audio and video types. The biggest problem I find with mkv and mediainfo is, Mediainfo doesn't display AAC and x264 Bitrates in it's reports. The codecs are detected, but not the Audio or Video Bitrates.
How to this?

[davexnet]

The info is not there? Did you put it in text or tree modes?

[hello_hello]

I'd assume the bitrate info is obtained from whatever's written to the video stream, if it is. I just checked a few MKVs.... three I encoded myself, and three I didn't. Of the three I encoded, MediaInfo displayed a video bitrate for two if them, but not the third. All three were encoded using the same program (MeGUI) but using different revisions of the x264 encoder. The MKV for which it didn't display the video bitrate was the only one with AAC audio, which seemed a little co-incidental, but of the three I didn't encode two didn't show a video bitrate while the one which did contained AAC.

I've never seen a program display AAC bitrate. Not for a raw AAC stream or MKV. If it's written as an MP4 then it's a different story. I happened to have one on my drive and MediaInfo displayed it's AAC bitrate. I remuxed it as an MKV and it still displayed the video bitrate (although it changed the description to "nominal bitrate") but the AAC bitrate.... no more.
What's odd is MediaInfo always displays an "over-all bitrate", even for the MKV I checked where it didn't display either video or audio bitrates individually, and when it does display a video bitrate if you extract it from the overall bitrate what's left seems pretty right for the AAC audio....

I've no idea what rules MediaInfo decides to follow when it comes to displaying individual bitrates, but a quick look at the overall bitrate offered for MKVs would indicate it's not just making that one up, so I'd assume the info is there for the individual streams but for some reason MediaInfo isn't telling.

[thezanny]

yeah. I tried a several now. Mediainfo displays the Overall bitrate but not the exact bitrates of the streams.
I wonder why it happens with the combination MKV AAC and x264 because when I encode in MP4 AAC x264, all is displayed nicely.

[hello_hello]

I've no idea why. After I remuxed the MP4 as an MKV I thought about remuxing it back to an MP4 again just to see if the AAC bitrate info still displayed using MediaInfo, but my motivation didn't quite extend that far. Maybe when it comes to AAC the bitrate info is written to the MP4 container rather than to the actual audio stream. I don't know, I'm just guessing....