Free download of MPEG4-CELP encoder ?

[sabeel]

Hi

I want to know whether there are any freely available MPEG4-CELP encoders,as i want to create MPEG4-CELP streams only.

I have tried the MPEG4-CELP encoder from from mpeg4 audio reference software to create MPEG4-CELP streams in MP4 fileformat,but they dont play on any players like philips-platform4,mpegable,quicktime.

I DONT THINK IT IS A PROBLEM WITH PLAYERS LIKE PHILIPS4-PLATFORM PLAYER BECAUSE I have tried playing some 'MP4 fileformat streams with Mpeg4-CELP' in philips-platform4 player,and philips4-platform player does play these Mp4 fileformat stream with MPEG4-celp.

Hence 'Philips-platform4 player' and 'mp4player' from mpeg4Ip tools does play Mpeg4-Celp streams in mp4 fileformat.

It is just that,those mp4 fileformat streams with mpeg4-celp, that i have created using the mpeg4 reference audio software are not playing in these players.

i am confused if it is a player problem or Mpeg4 reference audio encoder problem.

HENCE,
I want to know whether there are any freely available MPEG4-CELP encoders,as i want to create MPEG4-CELP streams only.

waiting for a positive response on the issue

thank you
sabeel

[Sirber]

What is MPEG4-CELP ?

[SeeMoreDigital]

Hi sabeel... and welcome to the forum.

I'm curious... what type of audio stream accompanies these MPEG4-CELP encodes?

Do you have any short samples we could try... Personally I've not had much trouble playing most variations of Mpeg4 in .MP4 using Nero's ShowTime 2 Player (and filters).


Cheers

[bond]

Originally posted by Sirber
What is MPEG4-CELP ?

the audio coding format defined in mpeg-4 for speech encoding

Originally posted by SeeMoreDigital
Do you have any short samples we could try...

i already ask for this on hydrogenaudio, but he didnt answer...

moved to audio forum

[planet1]

QCELP (mpeg-4 style) is/will be used in the 3GPP2 standard (americas):

http://www.apple.com/quicktime/techn.../3gpp/faq.html

and QuickTime can encode that stuff (not as .mp4) - the question remains how to demux (maybe mp4UI) and play the elementary stream ...
(http://rarewares.org/mp4.html - maybe the Philips MPEG4 Player will do the job)

anyway I prefer AMR (afaik not part of the MPEG-4 audio codec family but still part of 3GP):

-free encoder (ffmpeg)
-free muxer (mp4box)
-free dshow filters (haali's mp4 splitter + ffdshow's amr decoder)

cya

[bond]

mp4box supports the importing of .qcp files, which includes qcelp afaik (but is not raw qcelp, but a container format for it)

[planet1]

http://filext.com/detaillist.php?extdetail=QCP

so that's what the .qcp extension is for - thx bond
(though jeanlf could have mentioned Q-CELP in his extension list http://gpac.sourceforge.net/auth_mp4box.php )


http://www.cdmatech.com/solutions/pr.../purevoice.jsp


Player:

ftp://ftp.eudora.com/eudora/purevoic...PureWin132.exe (probably too old)
ftp://ftp.eudora.com/purevoice/windo...n200b5.exe.old (incl. DirectShow filter *rename .exe.old -> .exe*)


Encoder:

ftp://ftp.eudora.com/eudora/purevoic...nverter3_1.zip

"pvconv v3.1.0: converts PCM (mono, 8 kHz, 16-bit) wav file to PureVoice qcp file, and vice-versa."



my approach:

ffmpeg.exe -i audio.ac3 -hq -vn -acodec pcm_s16be -ac 1 -ar 8000 audio.wav

pvconv audio.wav

(mp4box -add video.avi -add audio.qcp final.mp4)

mp4box -add video.avi -add audio.qcp -3gp final.3gp


results:

QuickTime doesnt play the 3GP - maybe because:

QT uses - Media Sub Type "mp4a"

and

mp4box - Media Sub Type "sqcp"

btw mp4box can correctly extract the QT-encoded 3GPP2 files
(extracted .qcp plays fine in the PureVoice Player)



Now if I only could convince Haali to add Q-CELP support to his splitter (assuming the Qualcomm dshow filters are of any use)

Last but not least i wonder how EVRC & SMV are related to QCP - maybe they represent the two modes referred in the Player (PureVoice & SmartRate).
http://gpac.sourceforge.net/auth_mp4box.php

[sabeel]

Hi all

I am trying to create MPEG4-CELP streams ..which means the audio coding format defined in MPEG-4 STANDARD for speech encoding defined in ISO/IEC 14496-3 (SUB PART-3 Speech Coding - CELP)

I am trying to finally put this MPEG4-CELP in an MP4fileformat .. by using mp4creater.exe to do this job.this is ofcourse if there is an encoder that would give me MPEG4-CELP raw stream or i dont need to use to mp4creator.exe if the encoder can give me directly in mp4 fileformat.

The problem is i have tried this mpeg4-celp encoder from mpeg4 audio reference software .. and i have been successfully been able to create the mpeg4-celp audio stream in MP4 fileformat.
BUT these MP4 fileformat streams are not playing on any players like philips-platform4,mpegable,quicktime.

ALSO I DONT THINK IT IS A PROBLEM WITH PLAYERS LIKE PHILIPS4-PLATFORM PLAYER AND and 'wmp4player' from mpeg4Ip tools BECAUSE I have tried playing some 'MP4 fileformat streams' with Mpeg4-CELP' in philips-platform4 player and 'wmp4player',and these two players do play these Mp4 fileformat stream with MPEG4-celp.

I have verified that the MP4fileformat stream with MPEG-CELP audio created by using MPEG4 reference audio encoder is proper as i am getting the correct information abt the MPEG4-CELP stream like bitrate,sampling freq etc..by using MP4GUI and Mp4info.exe...this information matches with my encoding parameters.I have also decoded this MP4 fileformat stream with MPEG4-CELP by using the MPEG4 reference audio decoder and i by doing this decoding i have been able able to get back my source wave file properly.Hence it may not be a problem with mp4fileformat stream with MPEG4-CELP audio.

THATS WHY I DONT UNDERSTAND WHY those mp4 fileformat streams with mpeg4-celp, that i have created using the mpeg4 reference audio software are not playing in these players.


HENCE I want to know whether there are any OTHER freely available MPEG4-CELP encoders,as i want to create MPEG4-CELP streams only,either as a raw MPEG-CELP audio stream or MPEG4-CELP stream in MP4 fileformat.

waiting for a positive response on the issue

thank you
sabeel

[bond]

as i wrote on hydrogenaudio, upload such a small celp .mp4 somewhere so we can check it ourselves

if you ignore us wanting to help you, we will start to ignore you

[SeeMoreDigital]

Originally posted by bond
as i wrote on hydrogenaudio, upload such a small celp .mp4 somewhere so we can check it ourselves

Agreed!

You can email a short sample to me if you like at SeeMoreDigital@msn.com


Cheers

[sabeel]

Hi bond,SeeMoreDigital

i have attached the MP4 fileformat stream with MPEG4-CELP audio in this reply.This is an MP4 fileformat stream with MPEG4-CELP audio that i have created using the MPEG4-CELP encoder from MPEG4 reference audio software.
I hope u guys will be able to access the attachment.Pls do let me know if u guys arent able to..i shall mail it to u guys...bond where..do u want me to mail u

[eb]

The fact that some program/hardware can read corectly the headers, is not meant that they are capable to decode the rest of the file.

eb

[SeeMoreDigital]

Sabeel has emailed me a test clip which you guys can download here.

EDIT: I must admit I've been unable to play the file in any of my players (including hardware players)... even tried de-muxing and re-muxing the stream


Cheers

[bond]

hm it seems your stream is "error resilient" celp and not normal celp

most decoders cant decode the error resilient versions of the streams they normally support (the same for mpeg-4 video, aac aso...)

i assume you enabled error resilience while encoding with the reference, make sure its disabled

[sabeel]

Hi Bond

Thnx for reply.
But the confusing part is that the MPEG4-CELP encoder of MPEG4 reference audio software doesnt has any option like enabling or disabling the error-resilient property of the MPEG4-CELP stream

Can u please enlighten me as to how i can avoid the enabling of error-resilience property..since i couldnt find such an option in the MPEG4-CELP reference encoder.
(If incase we cannot disable the error-resilience property IN THE MPEG4-CELP ENCODER OF MPEG4 AUDIO REFERENCE SOFTWARE..can anyone please suggest any other freely available MPEG4-CELP encoder)

waiting for a positive response

thnx
sabeel

[bond]

sorry, dunno anything about the celp reference encoder, but i cant imagine that you cant set any options, not even in the source before compiling!?

[sabeel]

Thnx bond

Actually. i would not understand the source code as it is written in such a jargon manner.The reference encoder seems to encode the MPEG4-CELP streams inherently in a error-resilient way.

HENCE Can anyone please tell me whether there are any OTHER freely available MPEG4-CELP encoders,as i want to create MPEG4-CELP streams only,either as a raw MPEG-CELP audio stream or MPEG4-CELP stream in MP4 fileformat

Waiting for a positive response

Thnx
sabeel

[sabeel]

Hi all

I wanted to know what is the meaning of "error-resilient MPEG4-CELP".
How do u make out syntactically or other way that MPEG4-CELP stream is error-resilient.
Is their a way in the syntax of MPEG4-CELP that i can find out if the stream is error-resilient.
Are their any modes in encoding of MPEG-CELP that error-resilient property of MPEG4-CELP is set and if i use other modes it would then probably result in not using the error resilience of MPEG4-CELP stream.

thnx
sabeel

[SeeMoreDigital]

Please sabeel... hold back on the red text!

It attention grabbing in all the wrong ways...


Cheers

[planet1]

Seems that my assumption was wrong.

Q-CELP (used in 3GPP2) is NOT similar/compatible to MPEG4-CELP (used in MP4) !

It rather seems that MPEG4-CELP has more in common with AMR (e.g. ACELP algorithm):

http://www.audiocoding.com/modules/wiki/?page=CELP