Re: [Redbutton-devel] Small changes to rb for Fedora 9

[Simon K. <s.k...@er...>]

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Andrea wrote:
> Simon Kilvington wrote:
>> this should tell us what tags map to what PIDS - here's what I got:
>>
>> srk@earwig ~ $ nc 127.0.0.1 10101
>> assoc
>> 200 OK
>> Tag     PID     Type
>> ===     ===     ====
>> (audio) 0       0
>> (video) 0       0
>> 1       202     6
>> 101     301     11
>> 102     302     11
>> 103     303     11
>> 104     304     11
>> 105     305     11
>> 110     312     11
>> 115     313     13
>> 2       403     3
>> 51      404     6
>> 52      405     6
>> 53      406     6
>> .
> 
> I get the same.
> 
> I've tried to debug open_stream in MHEGBackend.c and I've noticed the following:
> 
> Usually audio & video go together and open_stream is called to open the dvr for audio and video.
> In the news multiscreen page, first the dvr is opened for video (no audio) and afterwards it is 
> opened for audio.
> 
> This is *not* possible. For some reason the dvr can be opened only once.
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5e85bd057f0cb29881e3d55d29f48bb55bd2f450
> 
> The problem is that I cannot figure out how you it can work for you. I've noticed that the code 
> follows a different path if it runs on the same machine as the server. Are you running over the network?
> 

err, I just tried it again and it doesn't work for me either now! I can
assure you it used to work for me :-) - either BBC have changed the way
their app works, or one of the kernel/lib/redbutton/etc updates I have
done has broken it at some point in the past - anyway, your singleton
solution sounds like the simplest - I will make MHEGStreamPlayer a
singleton - the UK MHEG spec says you only need to support a single
video/audio decoder - at the moment each separate MHEG Video and Audio
object gets its own stream player, and they all open the dvr device -
which works fine when there is only one, but not when the audio is a
separate object to the video object

another issue I need to resolve is since I upgraded ffmpeg and started
using avcodec_decode_audio2 - my sound is stuttering and I get errors
about "incorrect frame size" on the console - this comes from inside
the avcodec_decode_audio2 call, so I need to sort that out too

> There are 2 possibilities in my opinion:
> 
> 1) treat dvr as a singleton and share it
> 2) use the new feature DMX_OUT_TSDEMUX_TAP
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b01cd937895ad4114a07114cfb6b8b5d2be52241
> 
> where the demux outputs TS data (the same as DVR) and not PES (as it used to do).
> 
> Andrea
> 

thanks for your help and comments


- --
Simon Kilvington


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