MPEG-1/2 compatibility

Started by Federico Sambilay in Image Signal Processing15 years ago 3 replies

Hi! Can an output of an MPEG-1 (audio/video) encoder be decoded correctly by an MPEG-2 decoder? Thanks! ...

Hi! Can an output of an MPEG-1 (audio/video) encoder be decoded correctly by an MPEG-2 decoder? Thanks! __________________________________


Problem reading MPEG Files

Started by "Sudeep. S" in Image Signal Processing11 years ago 1 reply

Hi, I downloaded the required MEX files (from mathworks.com) and created the DLL to read MPEG videos in MATLAB. Some videos are being read, but...

Hi, I downloaded the required MEX files (from mathworks.com) and created the DLL to read MPEG videos in MATLAB. Some videos are being read, but it fails for others, saying that the format is not MPEG. One such video, for example, was taken from a Sony Cybershot DSC P8 camera, which provides videos in the MPEG VX format (640x480 VGA). Has anyone else here experienced such problems? Do let me kno...


where can i download some error concealment source code for MPEG-4/MPEG-2?

Started by eagle_jyjh in Image Signal Processing16 years ago 1 reply

hi all, i want to add error concealment features to my mpeg-4/mpeg-2 decoder, so i want to download some source code for...

hi all, i want to add error concealment features to my mpeg-4/mpeg-2 decoder, so i want to download some source code for reference. where are there such source code?


Internal Structure of an MPEG Frame

Started by ambi...@yahoo.co.in in Image Signal Processing9 years ago 1 reply

Hi, I want to know the internal structure of an MPEG frame.I am doing my project on "motion detection in the compressed domain".So my first step...

Hi, I want to know the internal structure of an MPEG frame.I am doing my project on "motion detection in the compressed domain".So my first step of the project is to parse the MPEG video and get the header information.I was able to get the frames(Like which is the I frame or B frame).But as I don't know the internal structure of the frame,I am not able to proceed further.So please provide me with...


MPEG-2 Quantizers

Started by adit...@gmail.com in Image Signal Processing11 years ago

Hi all, Can anyone please tell me how many quantizers are used for DCT quantization in MPEG-2? Thanks a lot. -Aditya

Hi all, Can anyone please tell me how many quantizers are used for DCT quantization in MPEG-2? Thanks a lot. -Aditya


MPEG 4 Video Decoder Comformance Criteria

Started by shat...@wipro.com in Image Signal Processing14 years ago

Hi Friends, - Does anyone know what is the conformance criteria for an MPEG 4 Video Decoder? - What is a sprite ? Thanks in...

Hi Friends, - Does anyone know what is the conformance criteria for an MPEG 4 Video Decoder? - What is a sprite ? Thanks in Advance, Shathiesh Rao S J


MPEG-4 profiles and levels

Started by Anonymous in Image Signal Processing18 years ago

Hello all I m working on MPEG-4 encoder. Currently Im looking at profiles and levels. I m interested in getting a detail of three...

Hello all I m working on MPEG-4 encoder. Currently Im looking at profiles and levels. I m interested in getting a detail of three levels in visual simple profile,If any one know of any site ,book,or etc joohi


Quarter pel interpolation MPEG-4

Started by Ravi_Biju in Image Signal Processing17 years ago

Hi All, Could any one explain in detail how the quarter pel interpolation is done in MPEG-4 ? Rgds, -biju ...

Hi All, Could any one explain in detail how the quarter pel interpolation is done in MPEG-4 ? Rgds, -biju


MPEG-4 Motion Compensation

Started by Federico Sambilay in Image Signal Processing15 years ago 1 reply

Hi! During MPEG Motion Compensation, why must the "reconstructed" (the one that pass through DCT, Quantization...) previous...

Hi! During MPEG Motion Compensation, why must the "reconstructed" (the one that pass through DCT, Quantization...) previous frame be used for prediction instead of the "original" previous frame? Thanks! ____________________________


Size of macroblock in MPEG

Started by ambi...@yahoo.co.in in Image Signal Processing9 years ago

Hi all, I have a doubt regarding the size of macro block in compressed video namely MPEG-4. Will the size of macro block vary within the...

Hi all, I have a doubt regarding the size of macro block in compressed video namely MPEG-4. Will the size of macro block vary within the compressed domain.In a paper,I have read that if there is moving object,the size of macro block will increase.I am not getting how this is becoming true?.Can you provide explanation for this?.


How to Read video MATLAB

Started by prat...@gmail.com in Image Signal Processing13 years ago

hi, i'm using MATLAB tool for signal processing. I want to read video (.mpeg, .dat) file in MATLAB but i couldn't find any function. for...

hi, i'm using MATLAB tool for signal processing. I want to read video (.mpeg, .dat) file in MATLAB but i couldn't find any function. for .avi file function is given but not for .mpeg or .dat thanx Pratik


MPEG-4 video doubts

Started by Manjunath R in Image Signal Processing18 years ago

hi friends, we are working on a MPEG_4 codec simple profile level 3. We have the following doubts: 1. In case of SP@L3 for...

hi friends, we are working on a MPEG_4 codec simple profile level 3. We have the following doubts: 1. In case of SP@L3 for rectangular VOP's, we are not decoding VOP height and width information as per the standard. Then how are they going to get implied? 2. We kn


Error recovery and concealment

Started by Arvind Raman in Image Signal Processing17 years ago

Hi there, Well I guess the dsp group has been idle for quite some time, so I thought I would post a nice little question to u...

Hi there, Well I guess the dsp group has been idle for quite some time, so I thought I would post a nice little question to u guys so as to keep this group alive. Well offlate I have been working on error recovery and concealment on an MPEG - 4 coded video bitstream. I


IMG_LIB MPEG 2 VLD

Started by mosh...@imagine-com.com in Image Signal Processing12 years ago

I have a question regarding Mpeg2 VLD function of the TI IMG_LIB. The API of the intra function is: void IMG_mpeg2_vld_intra_ ( ...

I have a question regarding Mpeg2 VLD function of the TI IMG_LIB. The API of the intra function is: void IMG_mpeg2_vld_intra_ ( const short *RESTRICT Wptr, // quantization matrix short *RESTRICT outi, // IDCT coefficients output array IMG_mpeg2_vld *RESTRICT Mpeg2v, // bitstream context structure int dc_pred[3], // DC prediction...