Incorrect duration for 4K video

[charliecroco]

Hello,

Do you have the same error : when creating video file choosing (sorry it is in french but can easily be understood)

• Fichiers MPEG Flux de transport
  24 Bits, 3840 x 2160, 50 ips
  basé sur trame
  (HDMV-PAL), 16:9
  Vidéo H.264
  Taux de données vidéo : Variable (Max. 65000 kbps)
  Débit de données audio : 384 kbps
  Audio Dolby numérique, 48 KHz, 3/2(L,C,R,SL,SR)

the duration of this file (as reported by Windows or MediaInfo) is incorrect (3 or 4 times bigger than in reality).

Do you have the same bug using VS 9 Pro?
Thank you

CD

[tletter]

the duration of this file (as reported by Windows or MediaInfo) is incorrect (3 or 4 times bigger than in reality).

Are you saying that a clip of say 1 minute duration is rendered out as 4 minutes duration? Have you changed the clip's speed? In any event, you haven't included any information about the duration of the source clip; the duration of the rendered output; and what filters/effects you applied.

tletter
https://www.youtube.com/user/tletter

[charliecroco]

No, the clip resulting from VS work is really one minute but Windows and MediaInfo tell that it is more than 3 minutes.
Maybe it's a bug of MediaInfo (and Windows), maybe it's a bug of VS.
MPC HC give the right duration and is able to read the file. VLC give the incorrect duration and is unable to read this file.

CD

[canuck]

Can you post the properties as shown by Windows or MediaInfo

What is MPC HC?

[Ken Berry]

What is MPC HC?

Media Player Classic Home Cinema.

[charliecroco]

MPC HC is a soft for video reading, as VLC.
I have to find how to send a PDF file showing MediaInfo information about this kind of file.
Just a short time.
Thank you
CD

[charliecroco]

Here is a pdf with information from MediaInfo :
- about the file from the camcorder
- about two files as created by VS; one with a choice of 50 pps, the other with 25 pps.
These information are in french (my language) but they can be easily understood.
I also have the files themselves but too big to be sent.

Thank you

CD

[Ken Berry]

For Media Info, just Export as Text (Click on File > Export, and choose the Text tab in the dialogue box which appears.) Then go to the text file and simply copy and paste in in your reply. No need to make a PDF of it.

EDIT: But I now see that your PDF contains comparative lists of properties, so PDF is a good format for that...

Unfortunately, I have never worked with XAVC format video. I note, however, that in your original video from the camcorder, the Average Bit Rate (Débit global moyen) is given as 56.3 Mbps, whereas in the Corel properties the average is shown as 15.8 Mbps (with a maximum of 48 Mbps) in both 50 and 25 fps modes. In other words, the Corel files use a bitrate which is roughly 1/4 or a quarter of the maximum bitrate (60 Mbps) shown for your original bitrate.

But I have no idea how Media Info (or VLC) work or why they come up with that very different duration based on a similar factor of nearly four times the original. And if Video Studio shows a duration which you can test by simply playing the clip and timing it with your watch, then I would not be worrying too much about the Media Info duration -- though I can understand why you are puzzled!

[charliecroco]

It's normal that the Average Bit Rate reported is incorrect, because the duration is incorrect. To get the true ABR you divide the size of the file by the true duration. And doing that you can see that the Average Bit Rate is close to the Maximum Bit Rate.
So, the only problem is the incorrect duration of the file.

[weaver]

Hi Ken

I do not know where did you get the ABR ( as Average Bit Rate), I think there is a problem as the ABR means probably in this case a new encoding technology Adaptive Bit Rate. The ABR ( adaptive BR) can be closer to the detected average bit rate of 15.8 Mbps but the decoding process is different from the former common decoding processes.

https://en.m.wikipedia.org/wiki/Adaptiv ... _streaming

[Ken Berry]

I do not know where did you get the ABR ( as Average Bit Rate), I think there is a problem as the ABR means probably in this case a new encoding technology Adaptive Bit Rate.

I got it from the French version of Media Info in charliecroco's attached PDF. It uses the French term "Débit Global Moyen" which in the English version of Media Info shows as "Average Bit Rate" (with the French "moyen" translating as it usually does either "middle" or "average").

I confess I have never before heard of Adaptive Bitrate, so thanks for drawing it to my attention. But I don't know what the French equivalent might be as a result -- though I suspect it will not be "Débit Global Moyen"...

[weaver]

I stopped also only because the average bitrate ( if this expression is correct from the French description) was strange to me with about 56 Mbps, the maximum was 60 Mbos ( stated also in the same document) while the Bitrate ( Debit) was defined to 54 Mbps.
Definitively the XAVC requires a special codec ( I do not know if Corel support this) and I do not think that the speed drop to 15 Mbps ( in the VS specification) will really bring the original performace ( in the VS AVCHD the steam is between 15-48 Mbps at least according to this description.)

Here is complete spec of XAVC and on the end there is a list of supporters of this format. Corel is not on the list. The list can be also out of date

http://www.xavc-info.org/xavc/share/dat ... Rev2_2.pdf

Eugen

[lata]

Hi
Just reading through the posts and I am a little confused
The original post seems to indicate a Transport Stream type of video, (blueray compliant) I assume the file extension to be MTS type, m2ts etc, the post does not show that?
Yet the PDF (clip from Sony Camcorder) shows the file to be MP4

Is this the same file or are there two files, just does not seem to add up?

[weaver]

The XAVC is also one kind of MP4 (H264) format. Unfortunately there are already too many subformats in MP4.

[lata]

That may be so, but those properties look identical to the ones I use as mts transport stream
Other than being in French, they do not look like MP4

Just wondering if there has been some mix up here