Re: MP4/Quicktime stuttering video (out-of-order Bfs)?

Ken Johanson wrote:
> Hi all,
> 
> A while back I wrote in a bug about a server problem,
where newer MP4 + 
> h264 content played through Helix server (11.1) and
Quicktime client, 
> has stuttering video (guessing out-of-order B
frames??). Does anyone 
> know what a quick fix is, and if newer server version
fixed this?
> 
If there are out of order B-frames or similar type problem,
that would
not be a server issue - it would be an encoding or hinting
problem which
would occur with any server.

Jamie

> Reproduction test case:
>
rtsp://stream01.breezeway.tv/static/test-helixserver.mp4
(Helix server 
> 11.1.0.719)
> Sample media:
> http://65.125.174.101/sys/public/test-helixserver.mp4
> Bug report:
> https://bugs.helixcommunity.org/show_bug.cgi?id=7
950&link=0
> 
> Regards,
> 
> Ken
> 
> 
> 
> _______________________________________________
> Datatype-dev mailing list
> Datatype-devhelixcommunity.org
> http://lists.helixcommunity.org/mailman/listinfo/da
tatype-dev

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Hi all,

A while back I wrote in a bug about a server problem, where
newer MP4 + 
h264 content played through Helix server (11.1) and
Quicktime client, 
has stuttering video (guessing out-of-order B frames??).
Does anyone 
know what a quick fix is, and if newer server version fixed
this?

Reproduction test case:
rtsp://stream01.breezeway.tv/static/test-helixserver.mp4
(Helix server 
11.1.0.719)
Sample media:
http://65.125.174.101/sys/public/test-helixserver.mp4
Bug report:
https://bugs.helixcommunity.org/show_bug.cgi?id=7
950&link=0

Regards,

Ken



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tatype-dev

Jamie Gordon wrote:
> Ken Johanson wrote:
>> Hi all,
>>
>> A while back I wrote in a bug about a server
problem, where newer MP4 
>> + h264 content played through Helix server (11.1)
and Quicktime 
>> client, has stuttering video (guessing out-of-order
B frames??). Does 
>> anyone know what a quick fix is, and if newer
server version fixed this?
>>
> If there are out of order B-frames or similar type
problem, that would
> not be a server issue - it would be an encoding or
hinting problem which
> would occur with any server.
> 
> Jamie
> 

I was told that the same file plays OK on a Darwin server (I
cannot 
vouch for this for not having one). And the file does play
OK off a 
local disk. So it appears Helix server is somehow reading or
sending 
timestamps differently.

Ken



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tatype-dev

Ken Johanson wrote:
> Jamie Gordon wrote:
>> Ken Johanson wrote:
>>> Hi all,
>>>
>>> A while back I wrote in a bug about a server
problem, where newer MP4 
>>> + h264 content played through Helix server
(11.1) and Quicktime 
>>> client, has stuttering video (guessing
out-of-order B frames??). Does 
>>> anyone know what a quick fix is, and if newer
server version fixed this?
>>>
>> If there are out of order B-frames or similar type
problem, that would
>> not be a server issue - it would be an encoding or
hinting problem which
>> would occur with any server.
>>
>> Jamie
>>
> 
> I was told that the same file plays OK on a Darwin
server (I cannot 
> vouch for this for not having one). And the file does
play OK off a 
> local disk. So it appears Helix server is somehow
reading or sending 
> timestamps differently.
> 
Okay, if the same file plays fine with the same player from
a Darwin
server, then it's almost certainly not out-of-order B-frames
but rather
something else entirely. Local playback is completely
different, as it
does not use the hint track.

Thanks,
Jamie

> Ken
> 
> 

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tatype-dev

Ken,

Does the .mp4 file have a hint track?

Eric

=============================================
Eric Hyche (ehychereal.com)
Technical Lead
RealNetworks, Inc.  

> -----Original Message-----
> From: datatype-dev-bounceshelixcommunity.org 
> [mailto:datatype-dev-bounceshelixcommunity.org] On
Behalf Of 
> Jamie Gordon
> Sent: Thursday, May 01, 2008 6:01 PM
> To: Ken Johanson
> Cc: helix-server-devhelixcommunity.org; 
> datatype-devhelixcommunity.org
> Subject: Re: [datatype-dev] MP4/Quicktime stuttering
video 
> (out-of-order Bfs)?
> 
> Ken Johanson wrote:
> > Jamie Gordon wrote:
> >> Ken Johanson wrote:
> >>> Hi all,
> >>>
> >>> A while back I wrote in a bug about a
server problem, 
> where newer MP4 
> >>> + h264 content played through Helix server
(11.1) and Quicktime 
> >>> client, has stuttering video (guessing
out-of-order B 
> frames??). Does 
> >>> anyone know what a quick fix is, and if
newer server 
> version fixed this?
> >>>
> >> If there are out of order B-frames or similar
type 
> problem, that would
> >> not be a server issue - it would be an
encoding or hinting 
> problem which
> >> would occur with any server.
> >>
> >> Jamie
> >>
> > 
> > I was told that the same file plays OK on a Darwin
server (I cannot 
> > vouch for this for not having one). And the file
does play OK off a 
> > local disk. So it appears Helix server is somehow
reading 
> or sending 
> > timestamps differently.
> > 
> Okay, if the same file plays fine with the same player
from a Darwin
> server, then it's almost certainly not out-of-order
B-frames 
> but rather
> something else entirely. Local playback is completely
different, as it
> does not use the hint track.
> 
> Thanks,
> Jamie
> 
> > Ken
> > 
> > 
> 
> _______________________________________________
> Datatype-dev mailing list
> Datatype-devhelixcommunity.org
> http://lists.helixcommunity.org/mailman/listinfo/da
tatype-dev
> 


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Ken Johanson wrote:
> Hi all,
> 
> A while back I wrote in a bug about a server problem,
where newer MP4 + 
> h264 content played through Helix server (11.1) and
Quicktime client, 
> has stuttering video (guessing out-of-order B
frames??). Does anyone 
> know what a quick fix is, and if newer server version
fixed this?
> 
> Reproduction test case:
>
rtsp://stream01.breezeway.tv/static/test-helixserver.mp4
(Helix server 
> 11.1.0.719)

The issue you are seeing should be fixed as of 11.1.5 (you
are using
11.1.0). The problem that was fixed is playback issues
similar to what
you mention with h.264 content created/hinted with QT
tools.

Thanks,
Jamie

> Sample media:
> http://65.125.174.101/sys/public/test-helixserver.mp4
> Bug report:
> https://bugs.helixcommunity.org/show_bug.cgi?id=7
950&link=0
> 
> Regards,
> 
> Ken
> 
> 
> 
> _______________________________________________
> Helix-server-dev mailing list
> Helix-server-devhelixcommunity.org
> http://lists.helixcommunity.org/mailman/listinf
o/helix-server-dev

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