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Audio shorter than video in H.264
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mache_nd69
(MXO2 Mini with MAX)




Joined: 04 Jul 2005
Posts: 7

PostPosted: Fri Oct 18, 2013 7:10 pm    Post subject: Audio shorter than video in H.264 Reply with quote

HY.
I want to capture from HDMI to a .264 file whith "Matrox - Blu-ray 1920x1080i 25 fps 30 Mbps" preset.

Video: Total Duration: 00:08:32:13
Audio: Total Duration: 00:08:31:34688

I don't know that the audio is jus short or that video speed is slower or audio speed is faster.
I loose 1 secont of sinc around 10 minutes of capture.

OS: Windows 7 ultimate
CPU: Intel core i7 4770
RAM: 8 GB
MB: G1.Sniper M5
GPU: MSI NVIDIA GeForce GTX 770
SSD: 2 X Kingston HyperX 3K 120GB SATA-III 2.5 inch

DirectShow: Wednesday, October 26, 2011 08:25:16
DirectDraw: 6.1.7600.16385 Tuesday, July 14, 2009 04:40:28
Direct3D: 6.1.7600.16385 Tuesday, July 14, 2009 04:15:08
MFC71.dll: 7.10.3077.0 Monday, September 05, 2011 20:05:00
MFC71d.dll: n/a
Matrox X.utils: RELEASE_UENDU_7.5.1 1966
Adobe Premiere CS6.0.5

(all software are up to date)

I need the video file and audio file on a H.264 capture to bee identical in lenght.

What can I do?
Best regards.
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Matrox_Support_Vlad
(MXO)




Joined: 04 Jul 2005
Posts: 805

PostPosted: Mon Oct 21, 2013 7:59 am    Post subject: Reply with quote

What application you are using to capture H.264 file?

Have you try Matrox H.264 Capture application?

The Matrox MAX H.264 Capture application lets you use your Matrox MXO2 product with MAX technology to capture clips directly to Matrox MAX H.264 files for Blu-ray Disc, the web, and mobile devices. The Matrox 264 (Blu-ray) creates a .264 elementary stream file, which is supported for Blu-ray Disc authoring.

Please note audio is captured as separate mono or stereo .aac files (AAC audio) or .wav files (PCM audio) and when capturing HDMI embedded audio, only uncompressed embedded audio is supported.

For more detailed information on Using Matrox MAX H.264 Capture please refer to User Guide Chapter 2, page 264-275.

http://www.matrox.com/video/media/pdf/support/windows/mxo2/doc/en_Matrox_MXO2_Installation_and_User_Guide_7_5_1.pdf
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mache_nd69
(MXO2 Mini with MAX)




Joined: 04 Jul 2005
Posts: 7

PostPosted: Wed Oct 23, 2013 3:57 am    Post subject: Reply with quote

Matrox MAX H.264 Capture we use for capture.
After I insert the captured files in Adobe Premiere the audio files is shorten.

Video: Total Duration: 00:08:32:13
Audio: Total Duration: 00:08:31:34688
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Matrox_Support_Vlad
(MXO)




Joined: 04 Jul 2005
Posts: 805

PostPosted: Wed Oct 23, 2013 8:21 am    Post subject: Reply with quote

- What is the source device you are capturing from and how you connected, via HDMI?
- If you are using HDMI, Video Input Source is set to HDMI and Audio Input Source is set to HDMI (embedded audio)?
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mache_nd69
(MXO2 Mini with MAX)




Joined: 04 Jul 2005
Posts: 7

PostPosted: Mon Oct 28, 2013 3:47 pm    Post subject: Reply with quote

I use BlaxkMagic ATEM Television Studio for capture.
Yes. The Audio Imput Source is set to HDMI (embedded audio).
-Brodcast Quality Source

16 bit - 48kHz
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mache_nd69
(MXO2 Mini with MAX)




Joined: 04 Jul 2005
Posts: 7

PostPosted: Tue Oct 29, 2013 1:36 pm    Post subject: Reply with quote

I have made an export from Adobe premiere to matrox H264 using Matrox.
The audio is shorter in this situation too.
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Alan Craven
(MXO)




Joined: 04 Jul 2005
Posts: 172

PostPosted: Tue Oct 29, 2013 2:09 pm    Post subject: Reply with quote

mache_nd69 wrote:
I have made an export from Adobe premiere to matrox H264 using Matrox.
The audio is shorter in this situation too.


For H264 exports, the answer is simple - you will find that there are some extra black frames added at the end of the video file. Why? No idea, it has been like this for several generations of Premiere/Encore and Matrox drivers now. It is referred to in the Release notes.

The easy solution is to simply trim these surplus frames from your video track in Encore.
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Matrox_Support_Vlad
(MXO)




Joined: 04 Jul 2005
Posts: 805

PostPosted: Tue Oct 29, 2013 2:38 pm    Post subject: Reply with quote

Thanks Alan your input is always appreciated.
When you export an Adobe Premiere Pro sequence to a Matrox MAX H.264 file, extra frames of black video may be added at the end of your exported file.
Try what Alan suggested and let us know results.
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autumn
(MXO)




Joined: 04 Jul 2005
Posts: 762

PostPosted: Wed Oct 30, 2013 8:55 am    Post subject: Reply with quote

Correct me if I'm wrong, but I thought that if you edit a video clip at all in Encore, it then needs to transcode again, which would defeat the purpose of encoding with MAX.

Jef
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Matrox_Support_Vlad
(MXO)




Joined: 04 Jul 2005
Posts: 805

PostPosted: Wed Oct 30, 2013 9:07 am    Post subject: Reply with quote

Instead of exporting material to a Matrox .264 file from Adobe Media Encoder or Premiere Pro and then importing the file into Adobe Encore for Blu-ray Disc authoring, you can choose to perform the transcoding of clips directly within Encore. The transcoding will be accelerated using the Matrox MAX H.264 codec.

User Manual chapter 19, page 255: Transcoding for Blu-ray Disc authoring in Adobe Encore

http://www.matrox.com/video/media/pdf/support/windows/mxo2/doc/en_Matrox_MXO2_Installation_and_User_Guide_7_5_1.pdf
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Alan Craven
(MXO)




Joined: 04 Jul 2005
Posts: 172

PostPosted: Wed Oct 30, 2013 10:09 am    Post subject: Reply with quote

autumn wrote:
Correct me if I'm wrong, but I thought that if you edit a video clip at all in Encore, it then needs to transcode again, which would defeat the purpose of encoding with MAX.

Jef


That is the case for long GOP, such as mpeg, but there is no problem with H.264.
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mache_nd69
(MXO2 Mini with MAX)




Joined: 04 Jul 2005
Posts: 7

PostPosted: Wed Oct 30, 2013 4:41 pm    Post subject: Reply with quote

I had the same problem whit the capture part of the BlackMagic ATEM Televizion Studio Mixer. And it's solved after a firmeware update.

Alan, Can you send me the correct GOP settings? Or a working preset for H.264 capture?
Tnks
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mache_nd69
(MXO2 Mini with MAX)




Joined: 04 Jul 2005
Posts: 7

PostPosted: Thu Oct 31, 2013 6:34 pm    Post subject: Reply with quote

I don't have blank frames.

The settings are:

H.264 Level: 4.1
CBR - 30mbps
Sample rate: Low
Data rate ajustment: 50
GOP type: Simple GOP
GOP size: 24
Distante between P Frames: 2
Noise filtrer: 0
Audio: WAV 16bit
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Matrox_Support_Vlad
(MXO)




Joined: 04 Jul 2005
Posts: 805

PostPosted: Fri Nov 01, 2013 9:15 am    Post subject: Reply with quote

Have you tried lowering the date rate?

When customizing the settings for a Matrox .264 file, be aware that Matrox .264 files that have a data rate higher than about 30 Mb/sec may require transcoding in Adobe Encore. The maximum H.264 level and data rate accepted by Adobe Encore for Blu-ray Disc authoring with audio and video is level 4.1 at 35 Mb/sec.
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mache_nd69
(MXO2 Mini with MAX)




Joined: 04 Jul 2005
Posts: 7

PostPosted: Fri Nov 01, 2013 5:44 pm    Post subject: Reply with quote

I will try lowering the settings. But the setting are from Matrox software presets.
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