[Red5devs] [Red5] Speex Test
Daniel Rossi
electroteque at gmail.com
Sat Oct 18 23:41:51 PDT 2008
I updated the docs again with a comment with the code I used for the
sample file. Steven already had a look into it and its referenced
above yours, it can only do 16khz so ignored the 44khz setting. I dont
understand what t5he framesperpacket setting does but i had set it to 2.
http://jira.red5.org/confluence/display/codecs/Speex+Codec
On 19/10/2008, at 5:20 PM, Art Clarke wrote:
> 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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