Multiple instances of VLC prepping h.264 for httplivestream

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Enver
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Multiple instances of VLC prepping h.264 for httplivestream

Postby Enver » 25 Apr 2013 11:53

Greetings. So I'm using VLC to convert my input (a livestream) into chunks to make them ready for HLS (Http LiveStreaming) for IOS.
Now this all works, even on a Raspberry Pi.(Which is my main goal)

However: one stream works, two aswel. But when I try a third instance of VLC to convert for a third stream (I am in fact using the same input per instance right now) it sort of stops working. Different things happen when I add the third: Sometimes all of the VLC's stop working. Sometimes, the first two keep going and the third just does nothing. Just now: the first stopped, second seemed slow and the third worked.

The command I use, replacing <> tags with my own folders and such. (I use a different folder per stream)

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VLC -I dummy rtsp://<INPUTSTREAM> vlc://quit --sout="#std{access=livehttp{seglen=10,delsegs=true,numsegs=5,index=<MY_FOLDER>/mystream.m3u8,index-url=<MY_IP>/mystream-########.ts},mux=ts{use-key-frames},dst=<MY_FOLDER>/mystream-########.ts}"
Tested with several settings:
Raspberry Pi: Output on 16GB MicroSD card (Write speed up to 6 MB/s)
Raspberry Pi: Output on 16GB USB 3.0 stick (Write speed up to 25 MB/s tested)
MacBook: Output on 16GB USB 3.0 stick (Same as above)
MacBook: Output on 128GB SSD (Write speed up to 243MB/s)
Macbook: Output on 128GB SSD and 16GB USB stick combined.

The average output of my files seems to be about 2.5-3 MB/s, and as each file is 10seconds that equals about 0.3 MB/s. So it cant be the write speed that is the limit here. Nor the i/o given it doesnt work on a mac with an ssd.

CPU-usage during 2 instances and more on the raspberry is ok about 16% per instance (so up to 30%)
RAM usage remains below per VLC, seems to be ± 2.2%

By the way, I am using VLC 2.0.3 Twoflower on the Raspberry Pi and 2.0.6 Twoflower 64bit on my Mac.
To my knowledge these are the latest versions, tho I do find it a bit strange that Raspberry Pi is older.

Im wondering what the issue could be here. Did I overlook anything ?

Jean-Baptiste Kempf
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Re: Multiple instances of VLC prepping h.264 for httplivestr

Postby Jean-Baptiste Kempf » 25 Apr 2013 15:48

What are the logs?
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Enver
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Re: Multiple instances of VLC prepping h.264 for httplivestr

Postby Enver » 25 Apr 2013 19:06

Are there any more advanced logs then running from the terminal ? All Im simply getting is the following prints:

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[0x14cc820] access_output_livehttp access out: LiveHttpSegmentComplete: /home/pi/Desktop/WebServer/stream/mystream-0000003.ts (3) [0x14cc820] access_output_livehttp access out: LiveHttpIndexComplete: /home/pi/Desktop/WebServer/stream/mystream.m3u8
Oh and I just tried verbose mode: Sometimes I get this in between segments. (Seems to be only at the beginning, cant tell relieable atm)

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[0xdbfee0] mux_ts mux warning: packet with too strange dts (dts=12862573337,old=12862626820,pcr=12862626820)
But really on activating a third VLC, that one just hangs after these prints: (And that error is always there)

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[0x1002216a0] dummy interface: using the dummy interface module... [0x1023008a0] main input error: ES_OUT_RESET_PCR called

Enver
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Re: Multiple instances of VLC prepping h.264 for httplivestr

Postby Enver » 27 May 2013 12:57

It turns out (yes, really stupid of me) that the problem wasnt in VLC or in the computer, but instead in the upload speed of the camera's their connection, that I used as input in VLC.


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