[FFmpeg-devel] NC camera patch (last round hopefully)

[nicolas martin]

Le 09-01-20 ? 15:11, Michael Niedermayer a ?crit :

> On Thu, Jan 15, 2009 at 04:55:39PM -0500, nicolas martin wrote:
>> Hi everybody !
>>
>> I sent a patch a few days ago, I didn't receive much comments  
>> except I was
>> harcoding the fps of my video decoder.
>>
>> The stream is MPEG-4 but I don't know if there is a standard way of
>> finding/estimating the fps in such feeds.
>>
>> If there is one, can somebody please help me in doing so ...
>> Once this is done, I don't think there will be much to do for my  
>> patch to
>> be accepted, so I'll stop bugging you around and will be happy :)
>>
>> Thanks again everyone.
>>
>> I re-attached my patch as I think it is not that big !
> [...]
>> +static int nc_read_header(AVFormatContext *s, AVFormatParameters  
>> *ap)
>> +{
>> +    AVStream *st = av_new_stream(s, 0);
>> +
>> +    if (!st)
>> +        return AVERROR(ENOMEM);
>> +
>> +    st->codec->codec_type = CODEC_TYPE_VIDEO;
>> +    st->codec->codec_id   = CODEC_ID_MPEG4;
>> +    st->need_parsing      = AVSTREAM_PARSE_FULL;
>> +
>> +    av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
>
> the timebase of the file you posted is 1/100
> we could assume that all use this

I'm wondering how it is possible that the timebase is 1/100 when the  
framerate is supposed to be at least 25fps.
In fact I think the camera was capturing at 30 fps in this video.

Is that possible ?

>
>
> [...]
> -- 
> Michael     GnuPG fingerprint:  
> 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Breaking DRM is a little like attempting to break through a door even
> though the window is wide open and the only thing in the house is a  
> bunch
> of things you dont want and which you would get tomorrow for free  
> anyway
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