[Libav-user] Duplicate frames?

[David R Robison]

After further review, it appears that the problem ceneters around 
interlaced video. From the logging, the Top field is processed twice 
(lines 3 & 4) and this seems to cause problems when the Bottom field 
finally arrives (line 8). Does this make since? Should/could this cause 
video quality problems?

[4064] slice:1 T mb:0 P fix pps:0 frame:8 poc:65552/2147483647/65552 
ref:1/1 qp:24 loop:1:0:0 weight:0
[4064] slice:1 B mb:0 P fix pps:0 frame:8 poc:65552/65553/65552 ref:1/1 
qp:24 loop:1:0:0 weight:0
[4064] slice:1 T mb:0 P fix pps:0 frame:9 poc:65554/2147483647/65554 
ref:1/1 qp:24 loop:1:0:0 weight:0
[4064] slice:1 T mb:0 P fix pps:0 frame:9 poc:65554/2147483647/65554 
ref:1/1 qp:24 loop:1:0:0 weight:0
[4064] mmco: unref short failure
[4064] mmco: unref short failure
[4064] illegal short term buffer state detected
[4064] slice:1 B mb:0 P fix pps:0 frame:9 poc:65554/65555/65554 ref:1/1 
qp:24 loop:1:0:0 weight:0

David

David R Robison
Open Roads Consulting, Inc.
103 Watson Road, Chesapeake, VA 23320
phone: (757) 546-3401
e-mail: drrobison at openroadsconsulting.com
web: http://openroadsconsulting.com
blog: http://therobe.blogspot.com
book: http://www.xulonpress.com/bookstore/bookdetail.php?PB_ISBN=9781597816526

On 12/7/2012 10:41 AM, David R Robison wrote:
> Hmm... So I cannot reproduce it with ffplay. I am using ffmpeg though
> the ffdshow DirectShow filters. It does appear to be some kind of
> buffering issue as if I buffer 500ms of video it plays fine, otherwise I
> get video quality issues. Maybe I need to discuss this with the ffdshow
> folks. David
>
> David R Robison
> Open Roads Consulting, Inc.
> 103 Watson Road, Chesapeake, VA 23320
> phone: (757) 546-3401
> e-mail: drrobison at openroadsconsulting.com
> web: http://openroadsconsulting.com
> blog: http://therobe.blogspot.com
> book: http://www.xulonpress.com/bookstore/bookdetail.php?PB_ISBN=9781597816526
>
> On 12/6/2012 6:37 PM, Carl Eugen Hoyos wrote:
>> David R Robison <drrobison at ...> writes:
>>
>>> I am having a problem with poor quality of H.264 video.
>> Can you reproduce the poor quality with ffmpeg (the application)?
>> If yes, please provide command line together with complete, uncut
>> console output.
>>
>> Carl Eugen
>>
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>
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