Get camera timestamp from rtsp stream.

[Jeff Shanab]

I believe he is referring to the originator timestamp that is part of the
onvif standard and once triggered int he rtsp conversation finds it's way
into rtp-header extensions. GStream has support for this feature in a
plugin last I saw.

On Wed, Jul 19, 2023 at 5:37 AM Anand Sivaram via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> wrote:

> Hello Anton,
>
> The RTSP media is coming as separate RTP streams for each video and
> audio.  They must be having only usual RTP parameters like timestamp,
> sequence number and payload type.
> That too RTP timestamps are initialized randomly as per standard, so the
> timestamps on video and audio streams have no relation at all.
> If you are planning to read the time using some OCR software from the
> video frame, then you will have to decode H.264 and the typical granularity
> is 1sec.
>
> Are you using the "format-location" callback signal in splitmuxsink with
> which you can generate custom filenames with timestamp and any prefix.  It
> is not available on gst-launch, but it is definitely available on C and
> Python.
>
> Thanks and Regards
>
> Anand
>
>
> On Mon, 17 Jul 2023 at 15:36, Антон Шаров via gstreamer-devel <
> gstreamer-devel at lists.freedesktop.org> wrote:
>
>>
>> Hi.
>>
>> I’m given rtsp stream from camera, where each frame has capturing
>> timestamp.
>> Connection strin looks like rtsp://{usr}:{pwd{@ip_addr
>> /onvif/media?profile=Profile1
>> I need to store this data for some time and provide search access for
>> this data, either return closest (exact) frame for provided timestamp or
>> return mp4 file which containts this closest frame. My first pipeline is  rtsp
>> ! h264depay ! h264parse ! splitmuxsink  location=… max-time-size=10seconds
>> (for example), when I save new file via splitmuxsink, I’m some how need to
>> get camera timestamp
>> for first frame of video (or key frame) and maybe store this mp4 file as
>> timestamp.mp4 (or save ts for later in some db, for example).
>>
>> Other approach is to use jpegenc and to store each frame with it’s
>> timestamp, but I don’t know how to obtain timestamp for jpeg buffer (rtsp !
>> decodebin ! jpegenc ! appsink). But  I assume  that this won’t be effective
>> solution in terms of CPU and storage usage, and better to store mp4 files.
>>
>> So, in both cases I don’t know how to get reference-timestamp-meta for
>> needed buffer.
>>
>> Can someone help me?
>>
>> PS: I use C# wrapper, namely gstreamer-sharp, but I don’t think it is
>> relevant for this problem.
>>
>> Thanks in advance.
>>
>> --
>> С Уважением,
>> Шаров Антон
>>
>
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