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Old 6th April 2016, 19:02   #1  |  Link
lolmaster
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Stream size in MKVs

I see in some files, it shows video stream sizes of x264 tracks in mediainfo.
But in some, it does not show.
I muxed some using MKVtoolnix GUI myself and they don't show it either. AC3 tracks show the size, but not in x264 track or AAC.

Is there any way to mux them in a way that mediainfo shows the size of the x264 track (and AAC track, if can) using MKVToolnix GUI.
Thank you!
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Old 6th April 2016, 19:05   #2  |  Link
sneaker_ger
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Use newest MKVToolnix and newest MediaInfo and do not disable track statistic tags in MKVToolnix. Then it should show for all tracks.

For files without such tags it cannot always be calculated. For example AC3 is typically constant bitrate so it is easy to calculate. AAC is usually variable bitrate so it is not as simple.
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Old 7th April 2016, 01:02   #3  |  Link
lolmaster
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Thanks.
MKVToolnix version I tried is 9.0.1, the latest.
Mediainfo, not the latest. Like a month or 2 old. But does it matter here?
The files I see those info, are opened with same mediainfo program.
Mainly it is in x264 streams. I see them in some. If I mux same file again, or a different file, I dont see it. I just add and mux, never changed anything in settings. Where are settings for "track statistic tags"? I never changed anything!
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Old 7th April 2016, 03:43   #4  |  Link
kuchikirukia
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Oh neat, that's new.

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Old 7th April 2016, 05:25   #5  |  Link
osgZach
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Quote:
Originally Posted by sneaker_ger View Post
Use newest MKVToolnix and newest MediaInfo and do not disable track statistic tags in MKVToolnix. Then it should show for all tracks.

For files without such tags it cannot always be calculated. For example AC3 is typically constant bitrate so it is easy to calculate. AAC is usually variable bitrate so it is not as simple.
That makes no sense. The file size of the added file is the file size of that chunk of data sitting in the MKV container. How can it not calculate that? Bitrate should have nothing to do with it.
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Old 7th April 2016, 08:25   #6  |  Link
sneaker_ger
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I didn't say it cannot be calculated at all. But to do it you would have to deep probe the file as mkv does not have that information readily available in the headers (except for the new, completely optional statistic tags). If it's a CBR stream MediaInfo can just multiply bitrate and duration to come up with the stream size.
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Old 8th April 2016, 02:11   #7  |  Link
hello_hello
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Quote:
Originally Posted by osgZach View Post
That makes no sense. The file size of the added file is the file size of that chunk of data sitting in the MKV container. How can it not calculate that? Bitrate should have nothing to do with it.
I just checked, and for VBR MP3 MediaInfo is happy to display both the video and audio bitrates, durations and stream size, even without track statistic tags. It's also displaying the same when the audio is AC3, so I'm not sure the OP is completely correct. For MP3 in an MKV MediaInfo displays the same info as it does for the MP3 itself, so I assume that info is written to the stream and retained when muxing so it's easy for MediaInfo to dig it out. I thought that's how it works for AC3 too. The video bitrate MediaInfo calculates from there isn't always exact, but it's pretty close. I'm pretty sure MP3 streams contain duration info as well as bitrate info and I'd be surprised if the same wasn't true for AC3.

The problem with AAC streams is without track statistic tags being created the bitrate/duration info simply isn't there. Fully scanning a large MKV can take a while (try opening one with Bitrate Viewer). Information such as the encoder used to create the AAC is lost when remuxing to MKV, so I assume it's written to the container (M4A, MP4 etc) when the audio is encoded and not the audio stream itself. If you open a raw VBR AAC stream with MediaInfo, it doesn't even try to guess the bitrate or duration. Some programs give it a go so you can navigate. The AAC stream I opened with MPC-HC was 29 minutes long but MPC-HC displayed 28 minutes and 27 seconds. VLC updates the estimated duration as playback progresses. MP3DirectCut was out by about three and a half minutes. foobar2000 will play raw AAC but you can't navigate.
Oddly enough, MP3Tag was the one program I tried that appeared to take the time to scan raw AAC and get it right.... to within about 2kbps.

Last edited by hello_hello; 10th April 2016 at 10:21. Reason: spelling
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