Re: [Opensvcdecoder-support] Display timestamp in ffmpeg (libavcodec decoder) but not in OpenSVC

[M. R. <mr...@in...>]

We have to check that. The thing is weird because we are able to display picture are the right frame rate when we are putting -fps in the command line.
Mickaël

Le 4 janv. 2011 à 19:35, Shuaijun Zhang a écrit :

> Hi Mickael,
> 
> Yes, there is no PTS in the raw SVC video.
> And I don't mean ffmpeg is adding PTS for the raw .264 streams. I mean ffmpeg is adding PTS to the decoded picture. I got this from the ffmpeg source code ( I have not figure out how ffmpeg gets the PTS for decoded picture).
> 
> The way it works in ffmpeg is:
> AVC file ----> demuxer -----> ffmpeg decoder with NALs (Access Unit) as input ----> then we get the decoded picture (YUV) with PTS.
> 
> But with OpenSVC, we can only get the decoded picture, but no PTS with the decoded picture:
> SVC (.264) file -------> demuxer ------> OpenSVC decoder with NALs (Access Unit) as input -----> then we only get the decoded picture (YUV) without PTS
> 
> That is what I am wondering how the OpenSVC does not provide PTS for the decoded picture
> 
> Regards
> Jason
> 
> On 4 January 2011 17:20, Mickael Raulet <mr...@in...> wrote:
> Hi Jason,
> 
> My email is gone too early.
> 
> Timestamps are not part of the SVC codec standard. It is part of the transport stream mechanism not the decoding process of SVC.
> 
> Amendments to some transport stream standard have been added to support some SVC features. That is true that we are all conformant for all transport stream.
> 
> Btw do you mean that Ffmpeg is adding pts for raw streams (.264)? I believe you need to specify -fps in the command line.
> 
> Best regards,
> 
> 
> Mickael
> 
> Sent by my iPhone
> 
> Le 4 janv. 2011 à 16:17, Shuaijun Zhang <sz...@re...> a écrit :
> 
>> Hi all,
>> 
>> I read the source code of libavcodec decoder in ffmpeg, and there is a display timestamp with the decoded picture (AVFrame->pts). But with OpenSVC, there is no display timestamp in the decoded picture, in another word, OpenSVC does not specify the display timestamp to the decoded picture.
>> I am wondering that if this is the standard design for SVC decoder or OpenSVC is just not implementing this feature
>> 
>> Happy new year
>> Jason
>> -- 
>> Shuaijun (Jason) Zhang 
>> Research Engineer
>> Software Research Institute
>> Athlone Institute of Technology
>> Ireland
>> http://www.ait.ie/sri/
>> 
> 
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> 
> 
> 
> -- 
> Shuaijun (Jason) Zhang 
> Research Engineer
> Software Research Institute
> Athlone Institute of Technology
> Ireland
> http://www.ait.ie/sri/
>