Re: [Ekiga-devel-list] 3.2.5 release

[yannick <sevmek free fr>]

Damien Sandras a écrit :
> Le mercredi 08 juillet 2009 à 09:04 +0200, Eugen Dedu a écrit :
>> Damien Sandras wrote:
>>> Le lundi 06 juillet 2009 à 20:20 +0100, Peter Robinson a écrit :
>>>>>>>> So we are preparing a new stable release.  What are the blocking bugs?
>>>>>>>>
>>>>>>>> - picture in picture does not work sometimes
>>>>>>>> - -d 4 warnings about too many consecutive I-frames, still investigating
>>>>>>>> if it is harmful or not
>>>>>>>> - initially greyed image, seems only cosmetic, still investigating
>>>>>>>>
>>>>>>>> Are there others?
>>>>>>>>
>>>>>>> The PDU>1500 issue?
>>>>>>>
>>>>>>> Here is a report from a Ubnutu user (I know, I should not trust blindly
>>>>>>> a user, but i wont be able to test before tomorrow...):
>>>>>>> "No I hadn't installed any non-free codecs (not knowingly anyway).
>>>>>>>
>>>>>>> I wanted to confirm this so I booted from clean live USB memory stick
>>>>>>> image (Jaunty).
>>>>>>> Selected ekiga for installation.
>>>>>>> Synaptic informs that the following are required: libgsm1, libopal3.6.1,
>>>>>>> libpt2.6.1, libpt2.6.1-plugins-alsa, libpt2.6.1-plugins-v4l2. (All of
>>>>>>> these come from the Main repository).
>>>>>>>
>>>>>>> Once above are installed: Ekiga has the same problem as described above
>>>>>>> (PDU exceed 1500) and same solution as you describe above also works.
>>>>>>>
>>>>>>> Out-of-the-box Audio codecs: G722, Speex(16kHz), PCMA, PCMU, G726-16,
>>>>>>> G726-24, G726-32, G726-40, gsm, ms-gsm, Speex(8kHz).
>>>>>>>
>>>>>>> Out-of-the-box Video codecs: h261, theora.
>>>>>>>
>>>>>>> So, in answer to your question, only using default packages from Ubuntu
>>>>>>> is sufficient for PDU to exceed 1500."
>>>>>>>
>>>>>>> Do we need a workaround for this before a proper fix? (TCP support)
>>>>>> A workaround would be to switch off some codecs by default (for initial
>>>>>> installation), for ex. G726-24, G726-32, G726-40, gsm, ms-gsm,
>>>>>> Speex(8kHz).  What do you think?
>>>>>>
>>>>> Isn't that already the case ?
>>>>>
>>>>> I need to check.
>>>> The default in Fedora certainly doesn't enable them by default and we
>>>> don't do anything with that sort of config so I assume its the
>>>> default.
>>>>
>>> That's what I thought. By default, only a few codecs are enabled.
>> The bug is strange, since 
>> https://launchpadlibrarian.net/24407094/ekiga_3.2.0-0ubuntu1.diff.gz 
>> does not show any change related to enabled codecs in ekiga...
>>
> 
> I guess people enable everything.

I have done some limited search on the MTU topic and it seems the MTU
can vary along the patch. Beside large bandwidth can greatly benefit for
a larger MTU than 1500 and some people are pushing to have larger MTU in
this case. (I have a report with this case at hand here:
https://bugs.launchpad.net/ubuntu/+source/ekiga/+bug/380091 )I do not
know how the choice if 1500 is made inside OPAL; if it is hardcoded it
is probably a source of frame dropping in some case (and it happen
probably in silence). Around 1400 seems more safe but it seems to not
cover all cases.

AFAIK a proper fix for this situation is to use a discovery mechanism
for the MTU: fortunately this exist in RFC:
http://tools.ietf.org/html/rfc4821