[Red5devs] [Red5] Speex Test

[Art Clarke]

No problem.

By the way folks, I felt just awful about giving people hope that
Ffmpeg handled Speex so I did a little more poking.  Check out the
Wiki for a, um, patch to Ffmpeg that adds speex:

http://jira.red5.org/confluence/display/codecs/Speex+Codec

Dan, just so you know, I'll be expecting a cookie from you for this if
I make it to Australia any time.

Enjoy,

- Art

On Fri, Oct 17, 2008 at 11:44 AM, Daniel Rossi <electroteque at gmail.com> wrote:
> LOL seems like you got to the wiki first thanks :)
>
> On 18/10/2008, at 5:28 AM, Art Clarke wrote:
>
>> And yup, count it as dumb error; my speex encoded file was actually
>> nellymoser.  My bad folks.
>>
>> On Fri, Oct 17, 2008 at 10:55 AM, Art Clarke <aclarke at vlideshow.com>
>> wrote:
>>> Oh I forgot, just post the file to a server and make it really short
>>> (say 10 seconds).  I'll d/l it once you send the link.
>>>
>>> Thanks,
>>>
>>> - Art
>>>
>>> On Fri, Oct 17, 2008 at 10:55 AM, Art Clarke
>>> <aclarke at vlideshow.com> wrote:
>>>> Hi folks,
>>>>
>>>> Sorry, but I only browse this list about once a week at this point
>>>> so
>>>> I missed this.
>>>>
>>>> I think I got ffmpeg to correctly decode a Speex file, but I might
>>>> have made a mistake with my flash 10 client.  To help me test this,
>>>> can someone upload a flv file that they think has audio encoded as
>>>> Speex (preferrably recorded directly from fp10).  I'll turn through
>>>> some stuff on my end.
>>>>
>>>> What do you get out of it?  If it works, I'll document what I did :)
>>>>
>>>> - Art
>>>>
>>>> On Thu, Oct 16, 2008 at 10:18 PM, Daniel Rossi <electroteque at gmail.com
>>>> > wrote:
>>>>> Hi Steve ive updated it with your information, so you can confirm
>>>>> the latest
>>>>> trunk of ffmpeg still cannot do it ?
>>>>> http://jira.red5.org/confluence/display/codecs/Speex+Codec
>>>>> I find this interesting but depressing at the same time
>>>>> "rate is 16kHz for all speex in flash"
>>>>> So 16kHz mono is the only choice you have for Speex regardless of
>>>>> the
>>>>> settings, no wonder why I found it scratchy instead of artifacty
>>>>> when I was
>>>>> trying to boost it to the highest setting. I cannot understand
>>>>> why there is
>>>>> no mp3 or even ogg support yet :)
>>>>>
>>>>>
>>>>> On 16/10/2008, at 4:24 PM, Steven Woolley wrote:
>>>>>>
>>>>>> in case folks are curious, r15028 in ffmpeg appears to have been
>>>>>> when
>>>>>> speex was added to the flv container (For decoding); that change
>>>>>> was
>>>>>> committed on 8/29.
>>>>>
>>>>>
>>>>> Yeah, that was in response to my first bug report.  It wouldn't
>>>>> even read
>>>>> the file at all before that.  However, the problem remains that
>>>>> the audio
>>>>> can't be transcoded or decoded, it is simply "recognized" as
>>>>> speex based on
>>>>> the codec id.  They need more information before it can be
>>>>> decoded or played
>>>>> (from the more recent bug
>>>>> report https://roundup.mplayerhq.hu/roundup/ffmpeg/issue608).  I
>>>>> think our
>>>>> best bet is to compile this info as best we can, and then push to
>>>>> get it
>>>>> implemented in ffmpeg (although, there are java decoders for
>>>>> speex: http://jspeex.sourceforge.net/doc/org/xiph/speex/spi/Speex2PcmAudioInputStream.html
>>>>> ,
>>>>> so maybe it's be worth adding right to red5?)  Here's what's
>>>>> needed to do
>>>>> the decoding:
>>>>> rate is 16kHz for all speex in
>>>>> flash: http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WS5b3ccc516d4fbf351e63e3d118a9b90204-7d0d.html
>>>>> bitrate is given based on the quality (the adobe documentation
>>>>> now has a
>>>>> table to show the bitrate given the quality setting)
>>>>> nb_channels is 1 (I think it's mono only?)
>>>>> frames_per_packet is settable in the microphone class.
>>>>> Anything else?
>>>>>
>>>>> ogg/speex requires a header per the spec:
>>>>>          Field        Type   Size
>>>>> ---------------------------------------
>>>>>      speex_string     char[]   8
>>>>>     speex_version     char[]  20
>>>>>   speex_version_id     int     4
>>>>>      header_size       int     4
>>>>>           rate         int     4
>>>>>          mode          int     4
>>>>> mode_bitstream_version  int     4
>>>>>      nb_channels       int     4
>>>>>          bitrate       int     4
>>>>>       frame_size       int     4
>>>>>           vbr          int     4
>>>>>  frames_per_packet     int     4
>>>>>     extra_headers      int     4
>>>>>        reserved1       int     4
>>>>>        reserved2       int     4
>>>>>
>>>>> I'm sure not all of that is needed, and some of it will be
>>>>> constant (not
>>>>> stream dependent, at least from flash player).
>>>>> I'd put that all on the wiki page, but saw nowhere to actually
>>>>> get an
>>>>> account?  It looks good though, thanks for starting it!
>>>>> Steve
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>>
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>>>>>
>>>>>
>>>>
>>>
>>
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