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stuttering or aborting video stream (refs #2045)
Toerless Eckert wrote:
This patch tries to resolve problems in streamdev-client that
can occur when enabling "StreamFilters". Enabling this option
is necessary to receive certain programs with dynamic PIDs such as
some german "regional" broadcast (eg: NDR).
Problem:
Without this fix, the following behavior was observed on a Raspberry
PI running streamdev-0.6.1-git with VDR-2.6.1:
- Buffer overflows of filter data
- Stop/go video on channels
- Total stopping of video
More logs in:
http://www.vdr-portal.de/board16-video-disk-recorder/board55-vdr-plugins/125237-
streamdev-client-filter-daten-streamen-ndr-raspberry-haengt/
Analysis:
VDR expect section data from filters separately from the
main program stream. Historically, it received each filter data
via a separate file descriptor from the DVB card. In the streamdev-client
module, a socketpair is used to feed filter data to the main VDR code.
During certain operations in VDR, such as startup or channel change
(depending also on the speed of initialization of the video output driver),
VDR does not consume the filter data as fast as it is provided by
streamdev-client, resulting in overflow of the default socket buffers
used by streamdev-client.
To add to the problem of overflowing the socketpair buffers, the
streamdev-client code sends several times a second short packets into
the socketpair to determine if the receiving side (VDR) has closed
the socketpair (IsClosed(), CarbageCollect()). This further clogs
up the socketpair() buffer.
The raspberry PI socketpair buffering behavior seems to be the same
as that of other 3.x linux systems, the socket buffer size is by
default 163840, and it can be increased via sysctl net.core.wmem_max.
During startup, it can take up to 10 seconds before VDR will consume
filter data, so the socketpair buffer can fill up with 10 seconds worth
of data.
Solution
1. IsClosed()/CarbageCollect() where removed from client/filter.c
and replaced by explicitly tracking when VDR closes a filter socket.
This alone seems to already resolve the problem of hanging or stop&go
video and seems to be sufficient to receive dynamic-PID channels reliably.
2. filter.c was enhanced to request a larger socket buffer size
if config option FilterSockBufSize is set.
3. If supported (if streamdev-client runs on linux), the socketpair
queue is "flushed" to reduce the amount of "random" packet drop messages
and to rather drop sequential messages.
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Uwe@vdrportal)
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number of the device used on the server are returned respectively.
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with purely priority driven precedence.
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precedence among multiple clients. The VDR option "Primary Limit" which
has previouly been used for this purpose has been dropped in VDR 1.7.25.
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their DVB cards through streamdev-client/-server).
Must be enabled in streamdev-server setup. Obsoletes recursion patches.
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configurable in plugin setup (fixes #552)
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Modified Files:
HISTORY README streamdev-client.c streamdev-client.h
client/device.c client/setup.c client/setup.h client/socket.c
client/socket.h po/de_DE.po po/fi_FI.po po/fr_FR.po
po/it_IT.po po/lt_LT.po po/ru_RU.po po/sk_SK.po
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always work (thanks to sk8ter@vdrportal)
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no longer possible to receive multiple (FTA) streams from the same
transponder
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This method was introduced in VDR 1.5.15. Its absence could cause crashes
when shutting down VDR
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Modified Files:
HISTORY README client/device.c client/setup.c client/setup.h
po/de_DE.po po/fi_FI.po po/fr_FR.po po/it_IT.po po/ru_RU.po
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is set to FTA or streamdev device. Disabled transponder check.
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Yet it's not quite clear if this is really a proper fix. There have been
contradictory reports (#476).
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- added vdr-1.6.0-ignore_missing_cam patch
- dropped obsolete respect_ca patch
- removed legacy code for < VDR 1.5.9 (thanks to Rolf Ahrenberg)
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- changed externremux.sh's default location to VDRCONFDIR/plugins/streamdev
- added sample externremux.sh from http://www.vdr-wiki.de/
- stop providing channels after client has been disabled at runtime
- added logging of the client device's card index
- changed default suspend mode to "Always suspended"
- added "Hide Mainmenu Entry" setup option on client
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- dropped unused code for remote timers/recordings on client side
- dropped unused files client/{assembler,menu,remote}.[hc]
- dropped unused files in libdvbmpeg (reported by tobi)
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- dropped patches for pre VDR 1.4
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sometimes send ABRT after TUNE. Clean solution wanted!
Thanks to alexw (#255)
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Thanks to Petri Hintukainen.
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- Add separate data socket for sections data
- Sections data can be received when there is no active live view
(-> EPG scans etc. can be executed during replay etc.)
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- Try to detect data stream disconnections to
avoid 100% CPU-usage in cTSBuffer::Action()
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- VDR 1.5.0 calls some device members in different order and
streamdev can't currently handle this.
- do not trust in OpenDvr/CloseDvr, instead keep count of active PIDs,
open data connection when it is needed and close it only when there
are no active PIDs
(closing data connection unsubscribes all pids at server end)
- some sanity checks on server side
Modified Files:
client/device.c client/device.h server/connectionVTP.c
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- Implement virtual IsTunedToTransponder()
- Return true from Provides... functions
Modified Files:
client/device.c client/device.h
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ABRT will be sent after tuning, which will destroy the LiveStreamer on the server.
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- fixed destruction order on channel switch (fixes one crash that happens
occasionally when switching)
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