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mpeg-2 aac vs. mpeg-4 aac

hi, all, I am a little confused here. What is the difference between MPEG-2 AAC and MPEG-4 AAC? They all have main profile, LC. Can I see them just as different profiles? Is there any difference in the bit stream format? Do they require different decoders? Also the licensing, does MPEG-4 AA...

HW-based MPEG-2 to MPEG-4 converter needed

Hi, as mentioned in the subject line, I am looking for a MPEG-2 to MPEG-4 converter, which is implemented in hardware. AFAIK, only software-based solutions are available. Thanks for any help, Herbert ...

MPEG-2 links please

Hallo all, I am Monica from Germany working on Digital Video Broadcasting(DVB).I must implement a MPEG-2 frame generator in the VHDL.But to my surprise I couldnt find anything realted to MPEG-2 frame structure and low level MPEG-2 signalling details. Is MPEG-2 a poprietary standard?If any...

Mpeg

Hi all, Need a bit of guidance. I am planning to do a small project out of my own interest and learning. I have choosen to implement an Mpeg encoder/deocder. Planning to provide support for both mpeg 2 and 4. But i am stuck at one point. The ISO standard specs cost around 140 $ eac...

Real time MPEG-2 & MPEG-4 vedio encoding DSP

Dear, could you tell me names of some real time MPEG-2 & MPEG-4 based vedio encoding DSPs ? Thanks Iqbal ...

Matlab code for MPEG/h.264 video encoding and decoding

Hi I am in need of a MPEG/H.264 codec in matlab. I want to play with the compressed bitstream i.e. headers , motion vectors ,VLCs etc. I need to convert a video into mpeg bitstream .... and then put my watermark in this compressed domain. It would be great if anyone could provide a solution(pre...

Need Help in application based on MPEG4 or MPEG2

I want to make a demo application for IPTV based on MPEG4 or MPEG2. I have basic understanding of MPEG2 and MPEG4. I need help: How I can read packets from MPEG file in C or C++ Can any one suggest me beginner's tutorials for Implementing MPEG in C/C++ or any other language. OR any open sourc...

Newbie Question

Hi all, I am new to the field of DSP/Video Compression. I wanted to learn MPEG 4 Video Compression standard in particular as it is required in my current project which is about Live Video streaming using RTSP/RTP protocol on the internet using MPEG 4 codec. I have read some articles/ISO st...

H.264 or MPEG-4 for Surveillance?

Hello, Suppose you have a surveillance project on which two 4-CIF NTSC streams (704 x 480) @ 15 fps have to be encoded for network streaming and for storage, and that the network bandwidth is up to 2 Mbps. Also, the encoder has to run on an embedded platform (Blackfin, for example). Whic...

MPEG movies with sound

Hi all. I have used MPGWRITE with some success to make small MPEG movies from data I manipulate and plot with matlab. Now I want to put a sound track with the movie, but have a very vague recollection of having seen somewhere (I can't find any mention of it now) that MPGWRITE does not ...

H.264 vs. MPEG-4 for Surveillance

Hello, Supose you need to compress two independent video streams, each one being 4-CIF (704 x 480) at 15 fps for a surveillance application, and that they (both) need to be steramed thru the same network but the max bitrate that you have for that streaming function is 2 Mbps. Which one o...

Inverse Scan (Horizontal) in MPEG-4

I am unable to understand that why we go for horizontal or vertical scan at all while decoding MPEG-4 bitstream? I guess Zig-Zag scan is the best then why not only ZIG-ZIg. Is there any more compression by horizontal or vertical scan? According to mpeg-4 standard zig-zag scan is done only when ac pr...

Codec licences for MPEG layer 2 and AAC (LD)

Hi everyone, I'm currently investigating some audio-codecs used in radio-broadcasting. Apart of the technical issues involved there is obviously the topic of licencing. On the MPEG FAQ I found a contact at Philips for MPEG layer 2: w.l.vanderkruk@patents.corp.philips.com Unfortunately...

MPEG skipped block and motion vector?

Hi all, I am reading Fogg's MPEG FAQ. (http://bmrc.berkeley.edu/frame/research/mpeg/mpeg2faq.html) The FAQ have several diagrams about skipped block and motion vector. How to determine the skipped block in B frame? And what syntax in video stream describe it? e.g. If I have a picture seq...

MPEG source code

Hi there, Wondering if I can get free MPEG 4 / H.263 source code (written in java/C/C++/perl) for learning purpose. I'm a coding theorist & would like to apply some of the enhancement techniques at the decoder. Regards, -KK ...

MPEG /video revelation

Hi all. I have just spent a few days making some small MPEG movies that illustrate certain wave propagation phenomena. First of all, while I have made movies for my own use for the last 7 or 8 years, being able to actually make MPEG movies from time-domain simulated data has opened up a wh...

[MPEG] Why initialize YUV = 128?

Hi all, I am reading MPEG source code. I found all the Y U V are initialized to 128. Why? Before the I picture transform, the source picture was subtract from a "virtual" reference picture(Y U V are all 128). What's it mean? Any suggestions will be appreciated! Best regards, Davy ...

MPEG-7 Descriptor Code Repository?

Is there a public source code repository of MPEG-7 visual descriptors? Recently I am extracting visual features from video files, such as Color Moment, Edge Histogram, etc. I need some reference source code. How can I get it? Any help appreciated. Thanks in advance. ...

How to read Video only from MPEG file.

Hai all, Is it possible to read Video (or Audio) only from a MPEG (4) file ?. If we can..how to do. Regards, Ravi. ...

Need MPEG Player that Can Save Each Decompressed Frame

Hello. Is there a free/shareware MPEG player with the ability to allow me to save each decompressed frame as a JPEG/bitmap/etc. file? I need the ability to save 10 consecutive frames. Please respond to the newsgroup. The above e-mail address does not work. ...

MPEG video compression

Hi guys, I'd like to know if some of you have already implemented MPEG (2 or 4) video compression on DSP. What free source codes have you used ? Could you give me some links to good free source codes ? I've searched on the net but haven't found anything really good. Thanks for your help. ...

processor choice for mpeg

I'm starting to look at a home project for creating a stand alone webcam server. What I'd like to do is have 3-4 usb inputs for webcams, convert the inputs into mpeg and send the data out an ethernet port. I want to be able to support real-time (or close to it) video processing and run a web ser...

Phase continuous waveform generation for ATSC (N.American Digital TV standard).

I am trying to generate a test waveform which is compatible with the ATSC standard. I am obtaining the MPEG packets from a TV clip obtained from the web. I am ensuring that the MPEG packet frame rate of the transport stream packets is compatible with the ATSC standard. The waveform is converted ...

Re: MPEG2 MP@LL and MPEG1?

Davy wrote: > Hi all, > > I heard that MPEG2 and MPEG1 use same compression methods. > > MPEG2's MP@LL and MPEG1 are all 4:2:0, 352*288*30. But MPEG2's MP@LL is > 4Mbit/s and MPEG1 is 1.5Mbit/s. Why they have different bit rates? > > And if I want to do 352*288*30 video compression. ...

Doubts about MPEG file reading.

Hai all, I have some doubts about how we read the data from MPEG file. 1) Do we read Audio and Video simultaneously ? Or do we read one after another? Is free source code available to do so? 2) While we are reading the Video data, do we read them frame by frame or Block by Block (Macro...

Why can Matlab wavread() not read AAC .wav reference files?

I try to use wavread() function to open/read .wav reference files for AAC (MPEG-2 AAC) compliance test provided by ISO/MPEG (ISO/IEC 13818-4). But I got the error message "Data compression format (Format #65534) is not supported". However, there is no problem for Adobe Audition and Microsoft Win...

MPEG2 motion search problem?

Hi all, I want to implement a encoder deal with I and P frame. So only one reference frame is stored for motion search. Is it the reconstructed forward frame? But the MSSG (http://www.mpeg.org/MPEG/MSSG/) encoder's full search function require 2 frames. Its integer full search is based o...

h.264 or mpeg 4 or 263

HI I wonder whether the reference code of this coders is freely available? And where would that be? Bubu ...

Number of IDCTs for MPEG?

Hi I'd appreciate a sanity check on my back-of-the-envelope calculation of the number of IDCTs needed in an MPEG decode. If we have PAL 704x480 at 25 fps divided into 16x16 macroblocks, then we have 1320 macroblocks. If we are using YUV422 then each 16x16 macroblock has 4 8x8 blocks for ...

Block based compression

Hello, DOes anyone know of any efficient methods to compress parts of a video screen where perhaps motion is going on, ie a desktop playing an mpeg in the corner? Thanks ...

MPEG codecs resource?

Hello. Is there any good book that explains MPEG2, MPEG4, H.264, AAC algorithms and implementations? Or, any website would be great too. Thanks! Jack ...

Re: I am back

On 1 Oct 2005 19:45:56 -0700, "Radium" wrote: > dpierce@cartchunk.org wrote: > > > WAV is simply a specific container format for audio information. > > WAV files can hold linear PCM, non-linear PCM such as A-law or > > u-law, encodings such as MPEG, AC-3 and such. > > > > Thus, if ...

Re: Theora vs. M-JPEG2000

On 18 Feb, 23:18, Jaime Andres Aranguren Cardona wrote: > Hello, > > Talking about video codecs, specifically Theora (www.theora.org) and > M-JPEG2000, how do they compare in terms of compression ratio for a given > quality? Well, I've seen discussions that suggest JPEG2000 can compa...

Re: why DCT

thanks guido, that was illuminating but I made a mistake while framing the question. it should have read why DCT for video compression as in mpeg. I am sorry, but does it change your answer? ...

Re: MPEG4 on DM642 for free?

> Hi all, > > Does anybody know anything about the YMagic video platform offer? Their > advertisement suggests they offer their DM642 cards with a free MPEG4 > library ( http://www.ymagic.com/overview.html ). Does anybody have > experience with it? Is the library really free? What is the video...

MDCT

Hi Guys, Can anyone explain me How is MDCT different from basic DCT? how does MDCT achieve Time Domain Alias Cancellation ( TDAC ) which is useful in MPEG AUDIO compression. TIA. cheers. Bhanu ...

MPEG's coded_block_pattern problem?

Hi all, I am reading MPEG-2's spec. It has a VLC coded_block_pattern_420. The spec said we can get cbp from coded_block_pattern_420. But what's cbp's function? Is it a important parameter? Any suggestions will be appreciated! Best regards, Davy ...

Commercial mpeg2 decoder/scaler with industry leading performance on Blackfin uClinux are available!

We have developed mpeg2 decoder,mp3 decoder with excellent performance on Blackfin uClinux, for many applications with LCD, Scaler with mpeg2 decoder is also developed to suit LCD with pixel format ,the following are the details of the performance of the above: MPEG2 decoder: MCPS for MPEG2 ...

Re: What is MP3?

i2genius.com wrote: > What is the common MP3 coder? I don't need details, (although a url > relating to a detailed specification may be handy in the future), but > is it a: sub-band coder? Analysis by sythesis such as multipulse or > celp? sinusoidal? Something else? I don't know the ...

Re: MPEG2's Rate Control

Hi Bernie, Thank you ;-) I cannot catch your idea. Is it for decoder? And I am considering encoder :-) I found rate control is the most difficult part of the mpeg encoder design. Any suggestions will be appreciated! Best regards, Davy ...