MP4 H264 Codec playing back unpredictably

[Daniel Low]

Have you tried playing it back on your PC using VLC?

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Fonts are like cologne:

A bad choice speaks louder than a good one.

[Tim Higgins]

Thanks,
Just tried playing it back on VLC.
I got a significant better result only slightly choppy every once in a while. Seems to be random now where the picture will sort of jolt.

Now I am really confused.

Ideally I would want the video to be able to be played back through QuickTime since most people would not be familiar with VLC

More Info: The original video was created out of frames rendered then exported out of premiere as Quicktime Animation.
Next the video is exported out of sorenson media encoder under the preset for Bluray 720P – Mpeg4 the only setting changed was the frame rate to 30fps to match the existing speed of my footage.

I am not sure why quicktime can not play it back smoothly?
I am still confused on why the video would randomly jolt yet still play back smooth on the usb player?
Especially since movie trailers from quicktime that are encoded H264 playback well.
I realize I am likely missing something simple just not sure what.
I appreciate the help.

[Daniel Low]

It could be that your data rate is too high if you chose a BluRay spec profile – What is the datarate set to?

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Fonts are like cologne:

A bad choice speaks louder than a good one.

[Tim Higgins]

The data rate is set to “10400 Kbps” The Method is 2-Pass VBR

[Daniel Low]

Please can you provide complete details of your encoding profile.

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Fonts are like cologne:

A bad choice speaks louder than a good one.

[Tim Higgins]

The Profile Name is BD_720p24

Format Constraints: None
Stream Type: Non-Streaming (Not Hinted)

Audio Side
(Audio: Checked On

Codec: ATSC A/52
Data Rate: 640kps
Sample Size: 16
Sample Rate: 4800
Channels: 5.1 )

Video Side
(Video: Checked On
Codec: MainConcept H.264
Method: 2-PassVBR
Data Rate 10400 Kps
Frame Size: 1280W x 720H
Display Aspect Ratio Policy: Letter Box or Pillar
Frame Rate: 30 FPS (The Preset was Originally 24fps))

Only thing altered from the preset was the frame rate
The original file is 720P in size with a square aspect ratio.
Their is no audio in the original format

Thanks for taking the time to help me out.

[Daniel Low]

Any keyframe or IDR settings available?

Try knocking the datarate down to 5000K/s – It’ll likely affect the quality some but at least we’ll see if plays better.

IIRC the Apple trailers at 1080p are encoded at around 10Mb/s

__________________________________________________________________
Fonts are like cologne:

A bad choice speaks louder than a good one.

[Tim Higgins]

Sorry did not do the advanced tab

Here it is:

(Key Frame Every: 240 Frames
Auto Key Frame on Scene Change: Checked
Slider between Rare and Frequent is set to:50

AVC Profile: High
Interlace Mode: Progressive
Field Order: Greyed Out
Encoding Effort: Best
B-Frames: 2
CABAC Coding: No
Slices: 0)

I am going to send a test now with the data rate knocked down.

[Tim Higgins]

I sent a file with the data rate knocked down to 5000
It plays a little smoother but still jolts, just not as much.

So I’m guessing it is related to one of the other settings.

[Daniel Low]

Mmmmm, all the other settings seem fine.

I assume you unchecked audio encoding seeing there is none in the source.

Have you tried playing it back on another PC?

Is there a bunch of stuff running in the background on your PC?

Grabbing at straws here as all would appear ok from your settings.

Try another test using CBR, or lower the peak setting of your VBR datarate

__________________________________________________________________
Fonts are like cologne:

A bad choice speaks louder than a good one.