Hi Sebastian,
This is something that is missing in ffmpeg, if i recall correctly the
issue is that the seek_timestamp must be an int and devisable by
AV_TIME_BASE within rtspdec.c.
Anyhow, what is really needed is an external text string option for the
RTSP "Range:..." field, users can then do external calculations and
populate this header themselves as text.
All VMS systems differ in what they expect in the range header and none
in my opinion play by the RFC2326 rules completely, an external text
string gives you options.
For us, we had to modify rtspdec.c in a few places to accommodate this
functionality, setting the 'AVFormatContext->opaque' field to non null
points to our external range generated sting.
See rtspdec->rtsp_read_play(AVFormatContext *s)
We then build our modified version of libavformat.dll
FYI, whilst we were in rtspdec we also allowed multiple PLAY commands to
be sent without the PAUSE/PLAY as an optimization option.
Cheers,
Richard.
On 28/05/2020 23:18, Demers, Sebastien wrote:
Hi All,
I'm using ffmpeg to stream from our video server live stream (Genetec Security
Center 5.9.1). It is recording as well the video feed.
To playback such recorded video, following the RTSP
(https://www.ietf.org/rfc/rfc2326.txt), I need to add a "Range" header to the
PLAY request.
Example:
Range: clock=19960213T143205Z-;time=19970123T143720Z
Anyone know how to pass this argument even from the ffmpeg command line? I try the
"-headers" argument, but that seem to be for the http request header.
I'm able to pass it some time with java/JavaCpp code like:
int ret = av_seek_frame(_fmtCtx, -1, timestamp, AVSEEK_FLAG_BACKWARD);
Without range, the stream start 5 minutes ago, so with the timestamp I can move
forward within the 5 minutes to now range.
For my scenario, that seek is not what is required. I want to open the stream
at a specific date/time, of lets say noon yesterday.
Thanks in advance,
Sébastien
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Best Regards,
Richard Lince,
Owner and Founder
bluebox.video <https://www.bluebox.video>
+44(0)7841665146
Skype: richard.lince77
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