[vlc-devel] 1.1.4 runtime audio issue

[Mustafa Kuscu]

Now just tried these additional cases:

i)  forced audio codec to be ffaac in smplayer and it worked
ii) removing libfaad plugin from vlc-1.1.4/plugins: ffmpeg shipped with
vlc-1.1.4 cannot decode aac. previously i was testing it against the output
of a custom compilation.

Is ffaac same as libavcodec?



On Fri, Nov 5, 2010 at 5:47 PM, Kaarlo Räihä <kaarlo.raiha at gmail.com> wrote:

> If faad works and libavcodec doesn't, I would guess there is either bug in
> libavcodec (or maybe some flag that it doesn't support) or that the stream
> is somewhat against the specs. You can verify that it is a libavcodec issue
> by using some other player that use libavcodec (like ffplay). If you can
> replicate the issue with another libavcodec player, you should contact
> libavcodecs devs and share them a sample file that can be used to replicate
> the issue.
>
> 2010/11/5 Mustafa Kuscu <mustafakuscu at gmail.com>
>
>> Hi Kaarlo,
>>
>> Thanks for the response. Further investigating the issue, it appears that
>> there was a huge difference between the streams. I was assuming they were
>> both the same at first. Now the issue shifts to why i can't decode mp4a with
>> avcodec. And I will need to be able to play both as the encoder person is
>> out of my control.
>>
>> Also, see workaround below.. pertaining to libfaad..
>>
>>
>> Works (when audio encoder is mp3):
>> [0x6c243c] ts demux debug:   * es pid=68 type=4 fcc=mpga
>> [0x68a54c] main input debug: selecting program id=1
>> [0x50dc144] main decoder debug: looking for decoder module: 33 candidates
>> [0x50dc144] main decoder debug: using decoder module "mpeg_audio"
>> [0x50dc144] main decoder debug: TIMER module_need() : 42.000 ms - Total
>> 42.000 ms / 1 intvls (Avg 42.000 ms)
>> [0x50dc144] main decoder debug: thread (decoder) created at priority 2
>> (input/decoder.c:301)
>> [0x50dc144] main decoder debug: thread started
>>
>> Fails (mpeg aac):
>> ts debug:   * es pid=68 type=15 fcc=mp4a
>> main debug: selecting program id=1
>> main debug: looking for decoder module: 33 candidates
>> avcodec debug: libavcodec initialized (interface 0x344b01)
>> avcodec debug: ffmpeg codec (MPEG AAC Audio) started
>> avcodec debug: Using 192000 bytes output buffer
>> main debug: using decoder module "avcodec"
>> main debug: TIMER module_need() : 24.000 ms - Total 24.000 ms / 1 intvls
>> (Avg 24.000 ms)
>> main debug: looking for packetizer module: 21 candidates
>>
>> Workaround:
>> Also we have noticed that, if I copy libfaad_plugin from the original
>> 1.1.4 distribution to the custom build's plugin directory, it can play
>> mp4a.
>> [0x20da444] ts demux debug:   * es pid=68 type=15 fcc=mp4a
>> [0x209a54c] main input debug: selecting program id=1
>> [0x3acc534] main decoder debug: looking for decoder module: 34 candidates
>> [0x3acc534] main decoder debug: using decoder module "faad"
>> [0x3acc534] main decoder debug: TIMER module_need() : 17.000 ms - Total
>> 17.000 ms / 1 intvls (Avg 17.000 ms)
>>
>>
>>
>>
>>
>>
>> On Fri, Nov 5, 2010 at 3:07 PM, Kaarlo Räihä <kaarlo.raiha at gmail.com>wrote:
>>
>>>
>>>
>>> 2010/11/5 Mustafa Kuscu <mustafakuscu at gmail.com>
>>>
>>> Hi all,
>>>>
>>>> In the following scenario, all clients can receive audio stream but
>>>> cannot play it. Video plays OK.
>>>>
>>>> * rtp multicast stream
>>>> * custom compiled vlc-1.1.4, using configure with: --disable-update-check
>>>> --disable-nls
>>>> * fairly recent contribs + a recent mingw32 gcc: i586-mingw32msvc-g++
>>>> (GCC) 4.4.2
>>>>
>>>> VLC log is flooded with the following:
>>>>
>>>> avcodec warning: cannot decode one frame (311 bytes)
>>>> avcodec warning: cannot decode one frame (321 bytes)
>>>> avcodec warning: cannot decode one frame (320 bytes)
>>>> avcodec warning: cannot decode one frame (310 bytes)
>>>> avcodec warning: cannot decode one frame (327 bytes)
>>>> avcodec warning: cannot decode one frame (320 bytes)
>>>>
>>>> This happens on a mainstream group of Win XP PCs which may be missing
>>>> directx, etc.
>>>> However, on a Win7 PC , the same package can play the stream without a
>>>> problem.
>>>>
>>>
>>> Is the log same on non-working and working setups? Specially I would like
>>> to know which audio decoder VLC uses in working setups (near main debug:
>>> looking for decoder module).
>>>
>>>
>>>>
>>>> Any ideas on how to fix it? Do I need to enable a specific audio module?
>>>> The full log is attached.
>>>>
>>>> Regards,
>>>>
>>>> Mustafa
>>>>
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>>>>
>>>
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>>>
>>
>>
>> --
>>
>> Mustafa
>>
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>>
>
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-- 

Mustafa
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