Implementing a MPEGTS segmenter, what's the best approach?
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Implementing a MPEGTS segmenter, what's the best approach?
 
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Hello,
I'm trying to build a GStreamer plugin that would produce segments of MPEGTS files, each with a fixed duration. This is to create TS segments for the Apple HTTP live streaming protocol. I'm fairly new to developing for GStreamer and have a basic understanding of how it works.
The approach I had in mind is to create a plugin that includes both mpegtsmux and filesink. Within that plugin, it could produce individual ts files when certain duration is accumulated. Is this feasible? Is there another way to do this without having to replicate code that's already in mpegtsmux and filesink? Thanks,
-David
------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Implementing a MPEGTS segmenter, what's the best approach?
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On Thu, Dec 30, 2010 at 08:35:21PM -0800, David Zhao wrote:
> Hello, > > I'm trying to build a GStreamer plugin that would produce segments of MPEGTS > files, each with a fixed duration. This is to create TS segments for the > Apple HTTP live streaming protocol. I'm fairly new to developing for > GStreamer and have a basic understanding of how it works. > > The approach I had in mind is to create a plugin that includes both > mpegtsmux and filesink. Within that plugin, it could produce individual ts > files when certain duration is accumulated. > > Is this feasible? Is there another way to do this without having to > replicate code that's already in mpegtsmux and filesink? gst-launch ... ! mpegtsmux ! multifilesink next-file=key-frame \ location=%05d.ts David ------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Implementing a MPEGTS segmenter, what's the best approach?
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Thanks David! That's exactly what I was looking for.
On Thu, Dec 30, 2010 at 11:23 PM, David Schleef <[hidden email]> wrote:
------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Implementing a MPEGTS segmenter, what's the best approach?
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2010/12/31 David Zhao <[hidden email]>:
> Thanks David! That's exactly what I was looking for. > > On Thu, Dec 30, 2010 at 11:23 PM, David Schleef <[hidden email]> wrote: >> >> On Thu, Dec 30, 2010 at 08:35:21PM -0800, David Zhao wrote: >> > Hello, >> > >> > I'm trying to build a GStreamer plugin that would produce segments of >> > MPEGTS >> > files, each with a fixed duration. This is to create TS segments for the >> > Apple HTTP live streaming protocol. I'm fairly new to developing for >> > GStreamer and have a basic understanding of how it works. >> > >> > The approach I had in mind is to create a plugin that includes both >> > mpegtsmux and filesink. Within that plugin, it could produce individual >> > ts >> > files when certain duration is accumulated. >> > >> > Is this feasible? Is there another way to do this without having to >> > replicate code that's already in mpegtsmux and filesink? >> >> gst-launch ... ! mpegtsmux ! multifilesink next-file=key-frame \ >> location=%05d.ts That's probably the quickest way to produce segments for testing purpose but these fragments wouldn't follow the spec's recommendations[1]. " Transport Stream files MUST contain a single MPEG-2 Program. There SHOULD be a Program Association Table and a Program Map Table at the start of each file. A file that contains video SHOULD have at least one key frame and enough information to completely initialize a video decoder." A client can join the stream at any moment (downloading any of the available segments), so each segment must be independently decodable, which means you need to start each fragment with a PAT table, followed with a PMT table and starting with a keyframe. Andoni [1]http://tools.ietf.org/html/draft-pantos-http-live-streaming-05#page-4 >> >> >> >> David >> >> >> >> ------------------------------------------------------------------------------ >> Learn how Oracle Real Application Clusters (RAC) One Node allows customers >> to consolidate database storage, standardize their database environment, >> and, >> should the need arise, upgrade to a full multi-node Oracle RAC database >> without downtime or disruption >> http://p.sf.net/sfu/oracle-sfdevnl >> _______________________________________________ >> gstreamer-devel mailing list >> [hidden email] >> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > > ------------------------------------------------------------------------------ > Learn how Oracle Real Application Clusters (RAC) One Node allows customers > to consolidate database storage, standardize their database environment, > and, > should the need arise, upgrade to a full multi-node Oracle RAC database > without downtime or disruption > http://p.sf.net/sfu/oracle-sfdevnl > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > -- Andoni Morales Alastruey LongoMatch:The Digital Coach http://www.longomatch.ylatuya.es ------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Implementing a MPEGTS segmenter, what's the best approach?
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On Sun, Jan 2, 2011 at 1:54 PM, Andoni Morales <[hidden email]> wrote: 2010/12/31 David Zhao <[hidden email]>: Thanks for the clarification here. Looks like the "correct" way to implement this is still to create a special purposed mpegts muxer that will write the PAT/PMT tables at the beginning of each TS segment.
I noticed that the protocol says "SHOULD" instead of "MUST", perhaps the current implementation of iOS treat those tables as optional?
------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Implementing a MPEGTS segmenter, what's the best approach?
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On Sun, Jan 02, 2011 at 04:27:25PM -0800, David Zhao wrote:
> On Sun, Jan 2, 2011 at 1:54 PM, Andoni Morales <[hidden email]> wrote: > > > 2010/12/31 David Zhao <[hidden email]>: > > > Thanks David! That's exactly what I was looking for. > > > > > > On Thu, Dec 30, 2010 at 11:23 PM, David Schleef <[hidden email]> > > >> gst-launch ... ! mpegtsmux ! multifilesink next-file=key-frame \ > > >> location=%05d.ts > > > > That's probably the quickest way to produce segments for testing > > purpose but these fragments wouldn't follow the spec's > > recommendations[1]. > > > > " Transport Stream files MUST contain a single MPEG-2 Program. There > > SHOULD be a Program Association Table and a Program Map Table at the > > start of each file. A file that contains video SHOULD have at least > > one key frame and enough information to completely initialize a video > > decoder." > > > > A client can join the stream at any moment (downloading any of the > > available segments), so each segment must be independently decodable, > > which means you need to start each fragment with a PAT table, followed > > with a PMT table and starting with a keyframe. > > > > Thanks for the clarification here. Looks like the "correct" way to implement > this is still to create a special purposed mpegts muxer that will write the > PAT/PMT tables at the beginning of each TS segment. > > I noticed that the protocol says "SHOULD" instead of "MUST", perhaps the > current implementation of iOS treat those tables as optional? It helps to have this commit: commit 6ab508dfa56f92c86c3b379b6cfe4ff28f2551e4 Author: David Schleef <[hidden email]> Date: Sun Jan 2 19:19:27 2011 -0800 multifilesink: send stream headers in key-frame mode However, the problems with the above pipeline are greatly exaggerated. In the worst case (without the patch), clients will start the video one keyframe late. The *actual* problems with using mpegtsmux ! multifilesink are that it doesn't write out the .m3u8 file for you, and that you have little control over keyframe placement. David ------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Implementing a MPEGTS segmenter, what's the best approach?
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On Sun, Jan 2, 2011 at 7:28 PM, David Schleef <[hidden email]> wrote:
I've tested ts files generated by multifilesink (even before this commit) and it seems to work fine when it's not switching streams. When it does switch between variants, this commit may become necessary. I'll give this a shot, will report back with results.
Thanks!
------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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