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Old 20th July 2012, 20:47   #1161  |  Link
LoRd_MuldeR
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Quote:
Originally Posted by Zenitram View Post
Already added in SVN (in both OGG and Matroska), it will be in next official version.
a lot!
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Old 20th July 2012, 21:49   #1162  |  Link
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MediaInfo reports audio delays on mp4 files (muxed with L-Smash):
https://rapidshare.com/files/2377518...lay_sample.mp4

"Delay relative to video : -3s 337ms"
Where does that come from? There shouldn't be any delay in that file.
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Old 22nd July 2012, 09:29   #1163  |  Link
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Quote:
Originally Posted by sneaker_ger View Post
MediaInfo reports audio delays on mp4 files (muxed with L-Smash):
https://rapidshare.com/files/2377518...lay_sample.mp4

"Delay relative to video : -3s 337ms"
Where does that come from? There shouldn't be any delay in that file.
Video edit list:
Code:
00812FC9    Edit List (28 bytes)
00812FC9     Header (8 bytes)
00812FC9      Size:                                 28 (0x0000001C)
00812FCD      Name:                                 elst
00812FD1     Version:                               0 (0x00)
00812FD2     Flags:                                 0 (0x000000)
00812FD5     Number of entries:                     1 (0x00000001)
00812FD9     Entry (12 bytes)
00812FD9      Track duration:                       27352 (0x00006AD8) - 45586 ms
00812FDD      Media time:                           2002 (0x000007D2) - 3337 ms
00812FE1      Media rate:                           65536 (0x00010000) - 1.000
Audio edit list:
Code:
008166B1    Edit List (28 bytes)
008166B1     Header (8 bytes)
008166B1      Size:                                 28 (0x0000001C)
008166B5      Name:                                 elst
008166B9     Version:                               0 (0x00)
008166BA     Flags:                                 0 (0x000000)
008166BD     Number of entries:                     1 (0x00000001)
008166C1     Entry (12 bytes)
008166C1      Track duration:                       27404 (0x00006B0C) - 45673 ms
008166C5      Media time:                           0 (0x00000000) - 0 ms
008166C9      Media rate:                           65536 (0x00010000) - 1.000
--> there is an indication that video starts 3337 ms after audio. Else what is the meaning of this edit list?
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Old 22nd July 2012, 09:54   #1164  |  Link
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Hmm. But how does 2002 translate to 3337ms? Shouldn't it be something like 1000*2002/24000 ~= 83.417ms?
Sorry if my questions sound stupid, just trying to understand.

Last edited by sneaker_ger; 22nd July 2012 at 10:35.
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Old 23rd July 2012, 04:32   #1165  |  Link
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Originally Posted by sneaker_ger View Post
Hmm. But how does 2002 translate to 3337ms? Shouldn't it be something like 1000*2002/24000 ~= 83.417ms?
Sorry if my questions sound stupid, just trying to understand.
http://forum.doom9.org/showthread.ph...92#post1577792
http://mediainfo.svn.sourceforge.net...1=4836&r2=4882

It seems the bug (that misunderstands timescale of media_time) was fixed at rev4882.

MP4/MOV has two timescale.
One is for all tracks.
Another is for each media.

In this case, media timescale = 24000, movie timescale = 600.
So, 24000/600 * 83.417 = 3336.68ms = 3s 337ms.

Anyway this is still wrong at point of 'Delay relative to video' since media_time specifies the start time of composition.
Therefore, should take account of CTS of the sample composited at the first.
(Be careful. The first sample is not always the sample composited at the first.)
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Old 23rd July 2012, 10:08   #1166  |  Link
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Originally Posted by VFR maniac View Post
It seems the bug (that misunderstands timescale of media_time) was fixed at rev4882.
Actually, yes, I forgot this issue in my quick response. The specs say it is in media time scale units, so I was wrong (I was using the movie timescale unit) and it is corrected.
2002 is 83 milliseconds if I well understood now.

Quote:
Originally Posted by VFR maniac View Post
Anyway this is still wrong at point of 'Delay relative to video' since media_time specifies the start time of composition.
Therefore, should take account of CTS of the sample composited at the first.
(Be careful. The first sample is not always the sample composited at the first.)
So what would be exactly the meaning of this delta?
I see that track and media duration of :
- video: 45s 587ms (1093 frames)
- audio: 45s 673ms

so a delay of 83 milliseconds is maybe logical (the end of delay+video would be the end of audio)

I don't know what is the expected synchro when there is such "edit list" , any help is welcome.
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Old 23rd July 2012, 12:52   #1167  |  Link
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Originally Posted by Zenitram View Post
So what would be exactly the meaning of this delta?
I see that track and media duration of :
- video: 45s 587ms (1093 frames)
- audio: 45s 673ms

so a delay of 83 milliseconds is maybe logical (the end of delay+video would be the end of audio)

I don't know what is the expected synchro when there is such "edit list" , any help is welcome.
Each edit in edit list maps a portion of media timeline to presentation timeline.
Concatenation of all edits makes overall presentation of a track in the movie.
media_time of an edit specifies start time of arbitrary portion of media.
Let's say, CTS of the first composited sample is 2002 because of B-frames reordering, and the first edit has media_time = 2002, then presentation starts from CTS=2002 so the first composited sample is displayed without composition delay derived from B-frames.

Here, the difference of duration between video and audio is accidental and trivial.
Audio is encoded with AAC, so there shall be priming samples at the start and might be remainder samples at the end.
I guess the sum of priming and remainder samples makes 83 milliseconds.
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Old 23rd July 2012, 13:02   #1168  |  Link
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83ms != 45s 673ms - 45s 587ms = 86ms anyways. But yes, I did not remove the AAC encoder delay (and of course not padding at the end) during the sample creation.

Last edited by sneaker_ger; 23rd July 2012 at 13:09.
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Old 23rd July 2012, 13:47   #1169  |  Link
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Originally Posted by VFR maniac View Post
Each edit in edit list maps a portion of media timeline to presentation timeline.
Concatenation of all edits makes overall presentation of a track in the movie.
media_time of an edit specifies start time of arbitrary portion of media.
Let's say, CTS of the first composited sample is 2002 because of B-frames reordering, and the first edit has media_time = 2002, then presentation starts from CTS=2002 so the first composited sample is displayed without composition delay derived from B-frames.
So the delay is indeed zero?
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Old 23rd July 2012, 14:24   #1170  |  Link
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Yes, zero if the demuxer can handle edit list correctly.
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Old 6th August 2012, 21:28   #1171  |  Link
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Hi Zenitram,

Is there any chance you could add support for reading Opus audio files?

If you have not got one already, here's a sample: http://www.sendspace.com/file/ezi6q3


Cheers

EDIT: I've just spotted that LoRd_MuldeR has beaten me to the request
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Last edited by SeeMoreDigital; 6th August 2012 at 21:30.
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Old 8th August 2012, 17:19   #1172  |  Link
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Cool...

Support for reading Opus audio files has been added to MediaInfo 0.7.59

Thanks Zen
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Old 8th August 2012, 17:22   #1173  |  Link
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Support for reading Opus audio files has been added to MediaInfo 0.7.59. Thanks Zen
I only accepted a patch from Kurtnoise.
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Old 8th August 2012, 18:03   #1174  |  Link
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Don't know if it's already supposed to be fixed or still on the to-do list, but the delay of the mp4 sample shows as 83ms now with 0.7.59. Shouldn't this show as 0ms according to VFR maniac's explanation?

Here is an additional sample, this time with a negative delay of 2585 samples to compensate for the aac encoder delay:
http://www.mediafire.com/?57cha6d4yzp7h10
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Old 8th August 2012, 19:18   #1175  |  Link
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Quote:
Originally Posted by sneaker_ger View Post
Don't know if it's already supposed to be fixed or still on the to-do list, but the delay of the mp4 sample shows as 83ms now with 0.7.59. Shouldn't this show as 0ms according to VFR maniac's explanation?
I did not have the time to dig a lot in the issue. The tests I have made have a problem: some files I have, with B-frames, have an edit list starting at 0. So I must first understand how all is "compatible" because with the explanation from maniac, there should be a delay in the edit list.
Is there a precise place in specs saying that it is the mandatory behavior? I saw the same kind of explanation in CFF specs, so I don't doubt it is a good explanation, but I have difficulties to understand how I can have the right delay for all the files I have.
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Old 8th August 2012, 21:45   #1176  |  Link
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The Mediainfo 0.7.59 32-bit mediainfo.dll doesn't work properly, at least with Staxrip. Version 0.7.58 and before works fine! The issue is that the framerate info isn't being delieved properly for the AssumeFPS() function, meaning instead of say, AssumeFPS(23.976) it comes up AssumeFPS() instead, which is invalid. This is an issue only with 0.7.59.
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Old 8th August 2012, 22:03   #1177  |  Link
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The issue is that the framerate info isn't being delieved properly
Which format? Any? I need a sample file.
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Old 8th August 2012, 22:50   #1178  |  Link
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Here is a sample of a file that is affected:
http://www.mediafire.com/?t62da6y8fz8gyl7

Some files work fine, other's don't. Might be something to do with multiple audio and subtitle streams?

As I said, this works fine with previous Mediainfo versions.

Last edited by burfadel; 8th August 2012 at 23:00.
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Old 9th August 2012, 09:04   #1179  |  Link
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Quote:
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Here is a sample of a file that is affected
Time stamps:
Frame 0 : 0
Frame 6 : 134
Frame 2 : 50
Frame 4 : 84
Frame 10: 217
Frame 8 : 167

Reordered:
Frame 0 : 0
Frame 2 : 50 (difference = 50)
Frame 4 : 84 (difference = 34)
Frame 6 : 134 (difference = 50)
Frame 8 : 167 (difference = 34)
Frame 10: 217 (difference = 50)

Average is right (42 ms) but in this case I detect VFR and I can not be sure it will be stable during the whole file.
so now I display:

Frame rate mode : Variable --> Meaning that the container has VFR
Original frame rate : 23.976 fps --> Frame rate indicated in the H264 stream

Is there any good reason to have such time stamps in the Matroska container? Is it wanted? Any kind of 3:2 Pulldown at the Container level? (in this case, I can try to detect it)
Quote:
Originally Posted by burfadel View Post
As I said, this works fine with previous Mediainfo versions.
Previous versions were buggy, because I was testing DefaultDuration field but the developper of mkvmerge said it was wrong. I can try to open a ticket for mkvmerge developper because in your case DefaultDuration is 42 ms and it is not logical compared to time stamps.
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Old 10th August 2012, 11:27   #1180  |  Link
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With MediaInfo 0.7.59 the METADATA_BLOCK_PICTURE information is not reported anymore for some OGG files, in both Tree and Text views, which is the way to know if there is at least one embedded cover inside the file.
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