Why is first few frames of WTV video missing after editing?

sheppy99

New member
Every-time I edit a H264 SD WTV file, I end up with a frozen picture for the first few frames when I play it back in Windows Media Center, although in VRD it plays OK. I can then skip back and the file will play from the beginning. I've had this problem for a while now so I don't think its a problem with the version I'm using V4.21.7.675
Is there a workaround for this?
 

Dan203

Senior Developer
Staff member
If possible try making the first frame in the output be an I or IDR frame. You can view individual frame types by enabling the frame type display in the thumbnail options.
 

sheppy99

New member
Thanks for the reply.
Is there any way of making VRD create the frames as I don't have some of the originals
If possible try making the first frame in the output be an I or IDR frame. You can view individual frame types by enabling the frame type display in the thumbnail options.
 

Dan203

Senior Developer
Staff member
That's what it does. I was trying to see if leaving the original I/IDR frames instead would make a difference.
 

Dan203

Senior Developer
Staff member
If you just want to add some run up try adding a title and just leave it blank. That will add 5 seconds of black to the start of the file. Maybe that'll be enough time for MCE to start decoding properly.
 

sheppy99

New member
Here's what I've found
Its related to the High 3.1 H264 profile I use as if I downgrade to the basic settings it cuts correctly but the file takes up another 50% space which is a problem. With the High 3.1 H264 profile:

1)Sound always starts correctly, video needs time to catch up
2)Scene I want to use starts on an IDR and ends just before an IDR
3)Adding a blank title makes the video play from the beginning but blank is too long
4)The smallest I can make the edit is 3 x IDR's long and - ie one back from an original IDR. This would be OK if I could mute the sound
5)This original is created by VRD in MKV H264 High/3.1 Interlaced then changed in VRD to WTV without a recode before editing
6)Creating 3 IDR + a few black frames by cutting bits out of a blank title doesn't work
Suggestions?
Would you like any of this to experiment with?
 

Dan203

Senior Developer
Staff member
So the problem files are being completely recoded? That's strange. Try saving the exact same file to a TS and playing it in VLC or WMP do you have the same problem? If not I think the decoder MCE is using mig be suspect. Are you using Windows 8? I've seen other reports of decoding problems and sync issues in Windows 8 that seem to be caused by the decoder included with Win8. If that's the case there are some open source alternatives and I believe I saw a program once that allows you to specifically select which codec MCE uses to play files.
 

sheppy99

New member
Pat, Thanks for the setting info
Dan,
All problem files recoded from MPEG2 TS to H264 High 3.1 to save space, sound left as MP2
1)I'm using Win7/32 with the default decoders - can anyone recommend something better or does it cause too many other problems? Usually it plays broadcast WTV H264/AAC-HE in SD and HD
2)Tried saving as a M2TS and playing in VLC and it works fine
3)A 2.6 Second blank title cures it in around 90% of cases - is there a way of making it add a blank title everytime?
 

Dan203

Senior Developer
Staff member
Since the M2TS file plays OK in VLC I'm still thinking this is a decoder problem. IIRC the newest DivX filter now supports decoding H.264 and is free. You should try installing that and then use this software...

http://www.hack7mc.com/downloads?did=21

To make sure that it's being used by MCE for your files.
 
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