I need a free (if possible:-) MPEG analyzer which can compare the
original MPEG file with the distorted (transmitted via lossy channel)
MPEG file. In the comparison, it should show me how many segments of
the MPEG file was lost, what's the breakdown of the loss (I/P/B
frames) and other useful information.

It would be great if it can also compare the "video quality" in some
way that can tell the difference of the original and distorted one.
(e.g. giving scores of the quality, giving human-like
descriptions/comments of the quality...)

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Clarification of Question by scwang-ga on 28 Apr 2005 21:50 PDT

BTW, I need an analyzer for MPEG-2.

Here's some links:

www.mpeg-analyzer.com
http://www.mindego.com/products/analyzer.php
http://www.pixeltools.com/MpegRepair.html

They may not be exactly what you need.

Mindego Analyzer 4600 does all the above and more

It is not free but you might be able to get the information you need from the demo.

http://www.mindego.com/products/demoForm.php

What this program can do.

MP4 file format (ISO 14496:1, ISO 14496:14) 
3GPP file format 
ISO base media file format (parsing only) 
MPEG-4 and AVC video in AVI files 
Advanced Audio coding (AAC) in MP4, 3GPP files 
MPEG-4 Video (ISO 14496:2) 
Profiles Supported: Simple (L0-L3), Advanced Simple Profile (L0-L5),
short video header
Object type: rectangular 
AVC/H.264 Video (ISO 14496:10) 
Profiles Supported: Main, Baseline, Extended (all levels) 
Operational Characteristics 

Pass-through mode 
Conformance checks 
Stream level statistics collection 
Hand-controlled picture by picture analysis mode 
Visual-aided random access to any location in stream 
Multiple file view and batch analysis 
Elementary stream extraction facility 
Analysis & Verification 

MPEG-4 video conformance checks per ISO/IEC 14496:4 
Profile specific checks for MPEG-4 Part 2 SP, ASP 
AVC video conformance Checks 
AAC audio conformance checks 
MPEG-4 meta data analysis 
Native file format type analysis (MP4, 3GPP, ISO) 
MPEG-4 v1.0 conformance checks 
ISMA conformance checks (v1.0) 
3GPP conformance checks 
Reconstructed IODS, OD, AUs, ESDS in MP4 file 
Object Descriptor stream data display 
Header field data presentation 
MPEG-4 Part 2: VOL, VOP, GOV 
MPEG-4 Part 10: PPS, SPS, Picture Type 
Macroblock level analysis 
MB header data, type and bit distribution 
Quantizer level distribution 
DCT, coded DCT, and IDCT values 
Picture overlay on MB grid 
Motion vector display on MB grid 
Peak Signal to Noise Ratio (PSNR) variation 
AVC slice arrangement, MB and sub-MB partitioning 
Coding tools analysis 
I, B, P analysis 
AC/DC prediction 
Method 1, Method2 quantization 
4-MV, Unrestricted and Direct Mode 
Half-pel, quarter-pel support 
Data partitioned based coding 
Video packet based coding 
Interlaced coding 
AVC: CABAC, CAVLC, entropy coding 
VBV buffer analysis (MPEG-4 video Part 2) 
VOP and Picture bit distribution graph 
Hex/Binary display for VOP and Macroblock data 
Graphical Interface Features 

Structured data display and navigation control 
File contents tree view 
VOL, VOP, Stream Statistics and Activity Log windows 
Fast random seeking of VOPs from any location in stream 
Structured error and information reporting 
Video player window