AW: storing one video stream into multiple files

Thu Feb 2 08:39:13 PST 2012

Hi,

thanks for reply, this is definitely working, but I need solution within gstreamer pipeline.
So I just have to look into ffmpeg sources and then replicate this functionality in my new element..

Jan Spurny

On Thu, 02 Feb 2012 16:31:13 +0100 (CET)
Angel Martin <amartin at vicomtech.org> wrote:

> Hi,
> 
> First of all, I am not sure that you could do this process in this place of
> the pipeline where you are trying to, because you don't control there when
> a Intra frame comes, so the files could not be correctly visualized later.
> 
> Maybe this solution, based on ffmpeg, could fix your problem:
> http://ffmpeg.org/ffmpeg.html#segment
> 
> You can find a more contextualized explanation here:
> http://forums.creativecow.net/thread/291/616
> 
> Best,
> 
> Angel
> 
> 2012/2/2 Jan Spurny <JSpurny at seznam.cz>
> 
> > Hi,
> >
> > thanks for reply, at first I thought that multifilesink was only useful
> > for dumping single frames, but than I found out it allows file splitting
> > not only on buffer boundary, but also on discontinuity (?? I don't really
> > know what that means) or key-frame.
> > Using key-frame as a boundary seems to work, but only with mpeg ts
> > streams, but I was only able to split incoming stream. When I tried some
> > re-encoding the pipeline has failed.
> > So it's a good start, but this way I have no control over the size of
> > resulting files and also I'm stuck with original stream format.
> >
> > For example, this "works" (vid.avi containst h264 stream):
> >
> >  gst-launch filesrc location=vid.avi \
> >       ! avidemux \
> >       ! mpegtsmux \
> >       ! multifilesink next-file=key-frame location=file-%03d.mpg
> >
> > and resulting mpeg files are playable, but as I said, I'll have many
> > different inputs and I need to re-encode the stream to some default format,
> > so when I tried this to get 30s fragments with h264:
> >
> >  gst-launch filesrc location=vid.avi \
> >       ! decodebin \
> >       ! x264enc \
> >       ! mp4mux fragment-duration=30000 \
> >       ! multifilesink next-file=key-frame location=file-%03d.mp4
> >
> > then I got first mp4 file which looks fine and I can play it, but the
> > others are somehow invalid and I can't play them.
> >
> > It seems to me that while mp4mux and multifilesink works fine together,
> > some crucial mp4 header is lost for all but the first file.
> >
> > Also the first playable file segment has length of 10 seconds regardless
> > of the specified "fragment-duration", so I probably got this one wrong..
> > And to make things even stranger, without "fragment-duration" option, even
> > the first file is not playable..
> >
> > Anyway, it seems that I'm at least moving in the right direction..
> >
> >
> > Jan Spurny
> >
> > On Thu, 02 Feb 2012 09:43:44 +0100 (CET)
> > Garbriel Neumüller <horsthuchen at googlemail.com> wrote:
> >
> > > Hi,
> > > do you know the Multifilesink plugin?
> > > I think it would do exactly what you expect .
> > > I never used it by my own but it sounds quite well.
> > >
> > >
> > >
> > > -----Ursprüngliche Nachricht-----
> > > Von:
> > > gstreamer-devel-bounces+horsthuchen=googlemail.com at lists.freedesktop.org
> > > [mailto:gstreamer-devel-bounces+horsthuchen
> > =googlemail.com at lists.freedesktop
> > > .org] Im Auftrag von Jan Spurny
> > > Gesendet: Mittwoch, 1. Februar 2012 12:01
> > > An: gstreamer-devel at lists.freedesktop.org
> > > Betreff: storing one video stream into multiple files
> > >
> > > Hi,
> > >
> > > I'm trying to store video from one video stream into multiple files with
> > > given duration.
> > > Something which could look like this:
> > >
> > > gst-launch souphttpsrc location=http://1.2.3.4/video1 ! decodebin !
> > x264enc
> > > ! SOMETHING filename="file_%D_%T.mp4" duration=2m
> > >
> > > and it would produce files like these:
> > >
> > > file_2012-02-01_10-12-43.mp4
> > > file_2012-02-01_10-14-43.mp4
> > > file_2012-02-01_10-16-43.mp4
> > > ..
> > >
> > > I don't expect that element "SOMETHING" already exists so I'll have to
> > write
> > > it myself. I have written a few simple gstreamer elements (mostly some
> > kind
> > > of raw-video transformations) so I'm quite confident I'll be able to do
> > it,
> > > but I do need all advices and guidelines I can get.
> > >
> > > I'll have many different inputs - different input sources (files, http
> > > streams, rtsp streams, v4l, ..) and also different input formats (mjpeg,
> > > mpeg4, h264, raw-yuv). But that's ok, gstreamer can handle these without
> > > problems.
> > >
> > > Now I can either just simply reuse the stream and just "cut it into
> > chunks
> > > of desired length", but as there are so many different formats to work
> > > with..
> > > Or I'll just recode video into some default format. That's why I have a
> > > "decodebin ! x264enc" in my pipeline above. I may support more formats in
> > > the future but for the first version one is enough.
> > >
> > > So with one known format (let's say h264) I'll have to "pack it" (muxer)
> > > into small chunks and write them down to disk.
> > >
> > > This is the part where I don't really know where to start - I guess
> > studying
> > > some existing muxer and would be a good start, but I'm really scared of
> > all
> > > the complexity with encoded video streams, B-frames, I-frames, and all
> > > this..
> > >
> > >
> > > Thanks in advance for any help, advices or suggestions.
> > >
> > > Jan Spurny
> > > _______________________________________________
> > > gstreamer-devel mailing list
> > > gstreamer-devel at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> > >
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