Hai all,

I have a set of SBR Conformance test streams. Those streams are in .mp4 format.

I have Helix MPEG4 AACLC Decoder code. This code contains SBR, PNS decoding modules.

Fine.

If I give these .mp4 streams for decoding, error returns.

Now, I take a raw wave file and convert into MPEG2 HEAAC stream using Winamp's aacPLus converter. If I test this stream it decodes and returns a playable wave file.

1. Do I have to convert this .mp4 stream into .aac stream? If yes, please tell me which tool can do that.

2. Do I rip down the .mp4 container from the stream and can apply that into the decoder? If yes, please tell me which tool I can use for ripping.

Thanks in adavnce.

MP4UI can extract AAC files from an MPEG4 container:
http://mp4ui.sourceforge.net/

Just open the file, select the audio track then click Export.

Use ffmpeg

Oh..! Thanks ppl.

I have downloaded mp4ui from the linked page and it works perfectly. roozhou, can u plz mention from where can i download ffmpeg tool?

meanwhile, i have downloaded mp4box and this tool also works perfectly. to check the functionality of this tool, i compared the extracted aac streams from both mp4ui and mp4box. both are exactly matched.

mp4box can be downloaded 4m here :: http://www.videohelp.com/tools/mp4box

This is a lite version of ffmpeg compiled by me:
http://sourceforge.net/projects/direct264/...180.7z/download

It can extract aac from almost any container and mux it into mp4/mkv/flv

Thanks roozhou...!