Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Jerome Martinez]

On 06/02/2018 18:09, Ronan Ricou wrote:

The thing is, some video data are lost during the remux as my file is smaller 
than it should be.
If I check with MediaInfo, the video stream bit rate, bits/(pixel*frame) value 
and stream size are smaller.


(disclaimer: I am the main MediaInfo developer)
In your case I think the video bit rate is estimated by MediaInfo from 
container size minus audio size minus estimated container overhead, and 
the difference may be due to some padding bytes in the MXF stream not 
copied by FFmpeg (for good reasons) and not the video stream size 
itself. MediaInfo is not intended to be used for such small difference 
check, at least by default (i.e. without scanning the whole file).
An additional information about if the indicated size is computed for 
sure or estimated is on our ToDo-list without ETA.

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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Ronan Ricou]

Hi,

Regarding the size difference, I already detailed it on my previous message: 
"I even tried to do a full remux, with the command ffmpeg -i INPUT_FILE -c copy 
-map 0 OUTPUT_FILE, and the files size aren't the same at all, there is a 165MB 
difference on the 16GB file I used (duration: 4m30s). The source one is 17 245 
128 240 Byte and the remuxed on is 17 072 370 871 Byte"

Anyway, on the two MXF analyzer tools I used, IRT MXF Analyzer  and Metaglue 
MXFixer, the MXF created by FFMpeg contains many warnings and a critical error:
ERROR : Partition ClosedCompleteHeader at 0x is a flagged as "complete" 
however MPEG2VideoDescriptor/VideoLineMap at 15d4 is set to its 
distinguished value.

As it was getting nowhere, I decided to use bmx MXF tools instead, and demuxed 
then rewrap the mxf file with mxf2rax and raw2bmx, and my MXF file doesn't have 
any error anymore. On the top of that, it can be opened in all NLE I tested, 
including BMD Resolve.
There is still a size difference between the original file and the remuxed one, 
but everything seems in place. If I ever find out where this size difference 
comes from and why, I will let you know.

Best Regards,

Ronan

-Message d'origine-
De : ffmpeg-user [mailto:ffmpeg-user-boun...@ffmpeg.org] De la part de Carl 
Eugen Hoyos
Envoyé : mercredi 7 février 2018 19:13
À : FFmpeg user questions <ffmpeg-user@ffmpeg.org>
Objet : Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the 
-copy option

2018-02-07 14:06 GMT+01:00 Ronan Ricou <mailto:r.ri...@b-architech.com>:
> The video itself seems fine (same duration, frame accurate), it's just 
> that I don't know where the size difference come from and what 
> information are lost.

Which size difference?

> I tried to open the file created by FFMPEG to BlackMagic Design 
> Resolve software, and it won't.

(LOL!)

Feel free to do the same test as in the other current mxf thread.

Carl Eugen
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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Carl Eugen Hoyos]

2018-02-07 14:06 GMT+01:00 Ronan Ricou :
> The video itself seems fine (same duration, frame accurate), it's
> just that I don't know where the size difference come from and
> what information are lost.

Which size difference?

> I tried to open the file created by FFMPEG to BlackMagic Design
> Resolve software, and it won't.

(LOL!)

Feel free to do the same test as in the other current mxf thread.

Carl Eugen
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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Ronan Ricou]

The video itself seems fine (same duration, frame accurate), it's just that I 
don't know where the size difference come from and what information are lost.
I tried to open the file created by FFMPEG to BlackMagic Design Resolve 
software, and it won't.
As I don't have any problem with the original file, maybe something is missing 
in the MXF metadata.
I'm still searching what's wrong.

Best Regards,

Ronan

-Message d'origine-
De : ffmpeg-user [mailto:ffmpeg-user-boun...@ffmpeg.org] De la part de Carl 
Eugen Hoyos
Envoyé : mercredi 7 février 2018 13:04
À : FFmpeg user questions <ffmpeg-user@ffmpeg.org>
Objet : Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the 
-copy option

2018-02-07 12:21 GMT+01:00 Ronan Ricou <r.ri...@b-architech.com>:
> Media info output, as I included in my initial question.

I don't think FFmpeg drops video data for your command line and I don't think 
MediaInfo would be able to show you such a drop.

Feel free to use third-party tools to extract the video streams and compare 
them, for example by counting frames.

Carl Eugen
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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Carl Eugen Hoyos]

2018-02-07 12:21 GMT+01:00 Ronan Ricou :
> Media info output, as I included in my initial question.

I don't think FFmpeg drops video data for your command
line and I don't think MediaInfo would be able to show
you such a drop.

Feel free to use third-party tools to extract the video
streams and compare them, for example by counting
frames.

Carl Eugen
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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Ronan Ricou]

Media info output, as I included in my initial question. Stream size in 
original file is 15.9GiB and 15.8GiB on ffmpeg remuxed one. Stream size for all 
audio element is the exact same on both files.
In addition, if you look at the report I linked, you will also see that the 
overall bitrate reported by ffmpeg isn't the same : 510Mb/s for the original 
file and 505Mb/s for the ffmpeg one, using the command:
ffmpeg -probesize 100M -i D:\test_uhd_ba1.mxf -c copy -map 0 D:\remux_uhd_2a.mxf
You will see that the audio bitrate per channel is the exact same, so only the 
video has changed somehow.

Best Regards,

Ronan

-Message d'origine-
De : ffmpeg-user [mailto:ffmpeg-user-boun...@ffmpeg.org] De la part de Carl 
Eugen Hoyos
Envoyé : mercredi 7 février 2018 11:45
À : FFmpeg user questions <ffmpeg-user@ffmpeg.org>
Objet : Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the 
-copy option

2018-02-07 9:30 GMT+01:00 Ronan Ricou <r.ri...@b-architech.com>:
> I know this because the size of the video stream isn't the same on the 
> remuxed file.

How did you check this?

Please do not top-post here, Carl Eugen

(And please do not use external resources for the console output, they can 
disappear.) ___
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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Carl Eugen Hoyos]

2018-02-07 9:30 GMT+01:00 Ronan Ricou :
> I know this because the size of the video stream isn't the same on the 
> remuxed file.

How did you check this?

Please do not top-post here, Carl Eugen

(And please do not use external resources for the console output,
they can disappear.)
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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Ronan Ricou]

Hi,

I know this because the size of the video stream isn't the same on the remuxed 
file. As its duration is the same as I can play it without any problem, I think 
some metadata were stripped off, but I don't know which and why. You can also 
see this in the MediaInfo report I included in my original message.
I even tried to do a full remux, with the command ffmpeg -i INPUT_FILE -c copy 
-map 0 OUTPUT_FILE, and the files size aren't the same at all, there is a 165MB 
difference on the 16GB file I used (duration: 4m30s). The source one is 17 245 
128 240 Byte and the remuxed on is 17 072 370 871 Byte
Here is a pastebin to the full ffmpeg report of the remux process output: 
https://pastebin.com/1g7wy59u
Full report of the input file: https://pastebin.com/jF1VKWgM
Full report of the output file: https://pastebin.com/hn17PHKC

Note: for the report I used the -probesize 100M option as otherwise I didn't 
get all the file information because after some time I get the following error 
message " Probe buffer size limit of 500 bytes reached".

Best Regards,

Ronan

-Message d'origine-
De : ffmpeg-user [mailto:ffmpeg-user-boun...@ffmpeg.org] De la part de Carl 
Eugen Hoyos
Envoyé : mercredi 7 février 2018 00:36
À : FFmpeg user questions <ffmpeg-user@ffmpeg.org>
Objet : Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the 
-copy option

2018-02-06 18:09 GMT+01:00 Ronan Ricou <r.ri...@b-architech.com>:

> I'm trying to remux a MXF XAVC file with the exact same video but only 
> 2 out of the 4 audio tracks.
> For that I use this command:
> ffmpeg -i INPUT_FILE -c copy -map 0:v -map 0:a:0 -map 0:a:1 
> OUTPUT_FILE
>
> The thing is, some video data are lost during the remux as my file is 
> smaller than it should be.

How do you know this?

Please test current FFmpeg git head and provide the command line you tested 
together with the complete, uncut console output.

Carl Eugen
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Re: [FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Carl Eugen Hoyos]

2018-02-06 18:09 GMT+01:00 Ronan Ricou :

> I'm trying to remux a MXF XAVC file with the exact same video but
> only 2 out of the 4 audio tracks.
> For that I use this command:
> ffmpeg -i INPUT_FILE -c copy -map 0:v -map 0:a:0 -map 0:a:1 OUTPUT_FILE
>
> The thing is, some video data are lost during the remux as my file
> is smaller than it should be.

How do you know this?

Please test current FFmpeg git head and provide the command line
you tested together with the complete, uncut console output.

Carl Eugen
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[FFmpeg-user] MXF XAVC UHD video stream modified while using the -copy option

[Ronan Ricou]

Hello,

I'm trying to remux a MXF XAVC file with the exact same video but only 2 out of 
the 4 audio tracks.
For that I use this command:
ffmpeg -i INPUT_FILE -c copy -map 0:v -map 0:a:0 -map 0:a:1 OUTPUT_FILE

The thing is, some video data are lost during the remux as my file is smaller 
than it should be.
If I check with MediaInfo, the video stream bit rate, bits/(pixel*frame) value 
and stream size are smaller.

Here is the output of the original file:
Video
ID   : 2
Format   : AVC
Format/Info  : Advanced Video Codec
Format profile   : High 4:2:2 
Intra@L5.1
Format settings, CABAC   : No
Format settings, GOP : N=1
Format settings, wrapping mode   : Frame
Codec ID : 0D01030102106001-0401020201323001
Duration : 4 min 30 s
Bit rate : 506 Mb/s
Width: 3 840 pixels
Height   : 2 160 pixels
Display aspect ratio : 16:9
Frame rate   : 50.000 FPS
Standard : Component
Color space  : YUV
Chroma subsampling   : 4:2:2
Bit depth: 10 bits
Scan type: Progressive
Bits/(Pixel*Frame)   : 1.219
Stream size  : 15.9 GiB (99%)
Color range  : Limited
Color primaries  : BT.2020
Transfer characteristics : HLG
Matrix coefficients  : BT.2020 non-constant

And of the remuxed file:
Video
ID   : 2
Format   : AVC
Format/Info  : Advanced Video Codec
Format profile   : High 4:2:2 
Intra@L5.1
Format settings, CABAC   : No
Format settings, GOP : N=1
Format settings, wrapping mode   : Frame
Codec ID : 0D01030102106001-0401020201323001
Duration : 4 min 30 s
Bit rate : 500 Mb/s
Width: 3 840 pixels
Height   : 2 160 pixels
Display aspect ratio : 16:9
Frame rate   : 50.000 FPS
Standard : Component
Color space  : YUV
Chroma subsampling   : 4:2:2
Bit depth: 10 bits
Scan type: Progressive
Bits/(Pixel*Frame)   : 1.207
Stream size  : 15.7 GiB (100%)
Color range  : Limited
Color primaries  : BT.2020
Transfer characteristics : HLG
Matrix coefficients  : BT.2020 non-constant

Using current release 3.4.1 and latest nightly (N-89956-gcaa4bd7a9f) does the 
exact same thing.

Any idea what's happening and how I can prevent this loss?

Many thanks in advance for your help,


Ronan

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