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• Re-solving My Search Engine Problem

  28 juillet 2012, par Multimedia Mike — General, swish-e

  14 years ago, I created a web database of 8-bit Nintendo Entertainment System games. To make it useful, I developed a very primitive search feature.

  A few months ago, I decided to create a web database of video game music. To make it useful, I knew it would need to have a search feature. I realized I needed to solve the exact same problem again.

  Requirements
  The last time I solved this problem, I came up with an excruciatingly naïve idea. Hey, it worked. I really didn’t want to deploy the same solution again because it felt so silly the first time. Surely there are many better ways to solve it now ? Many different workable software solutions that do all the hard work for me ?

  The first time I attacked this, it was 1998 and hosting resources were scarce. On my primary web host I was able to put static HTML pages, perhaps with server side includes. The web host also offered dynamic scripting capabilities via something called htmlscript (a.k.a. MIVA Script). I had a secondary web host in my ISP which allowed me to host conventional CGI scripts on a Unix host, so that’s where I hosted the search function (Perl CGI script accessing a key/value data store file).

  Nowadays, sky’s the limit. Any type of technology you want to deploy should be tractable. Still, a key requirement was that I didn’t want to pay for additional hosting resources for this silly little side project. That leaves me with options that my current shared web hosting plan allows, which includes such advanced features as PHP, Perl and Python scripts. I can also access MySQL.

  Candidates
  There are a lot of mature software packages out there which can index and search data and be plugged into a website. But a lot of them would be unworkable on my web hosting plan due to language or library package limitations. Further, a lot of them feel like overkill. At the most basic level, all I really want to do is map a series of video game titles to URLs in a website.

  Based on my research, Lucene seems to hold a fair amount of mindshare as an open source indexing and search solution. But I was unsure of my ability to run it on my hosting plan. I think MySQL does some kind of full text search, so I could have probably made a solution around that. Again, it just feels like way more power than I need for this project.

  I used Swish-e once about 3 years ago for a little project. I wasn’t confident of my ability to run that on my server either. It has a Perl API but it requires custom modules.

  My quest for a search solution grew deep enough that I started perusing a textbook on information retrieval techniques in preparation for possibly writing my own solution from scratch. However, in doing so, I figured out how I might subvert an existing solution to do what I want.

  Back to Swish-e
  Again, all I wanted to do was pull data out of a database and map that data to a URL in a website. Reading the Swish-e documentation, I learned that the software supports a mode specifically tailored for this. Rather than asking Swish-e to index a series of document files living on disk, you can specify a script for Swish-e to run and the script will generate what appears to be a set of phantom documents for Swish-e to index.
  

  When I ’add’ a game music file to the game music website, I have a scripts that scrape the metadata (game title, system, song titles, composers, company, copyright, the original file name on disk, even the ripper/dumper who extracted the chiptune in the first place) and store it all in an SQLite database. When it’s time to update the database, another script systematically generates a series of pseudo-documents that spell out the metadata for each game and prefix each document with a path name. Searching for a term in the index returns a lists of paths that contain the search term. Thus, it makes sense for that path to be a site URL.

  But what about a web script which can search this Swish-e index ? That’s when I noticed Swish-e’s C API and came up with a crazy idea : Write the CGI script directly in C. It feels like sheer madness (or at least the height of software insecurity) to write a CGI script directly in C in this day and age. But it works (with the help of cgic for input processing), just as long as I statically link the search script with libswish-e.a (and libz.a). The web host is an x86 machine, after all.

  I’m not proud of what I did here— I’m proud of how little I had to do here. The searching CGI script is all of about 30 lines of C code. The one annoyance I experienced while writing it is that I had to consult the Swish-e source code to learn how to get my search results (the "swishdocpath" key — or any other key — for SwishResultPropertyStr() is not documented). Also, the C program just does the simplest job possible, only querying the term in the index and returning the results in plaintext, in order of relevance, to the client-side JavaScript code which requested them. JavaScript gets the job of sorting and grouping the results for presentation.

  Tuning the Search
  Almost immediately, I noticed that the search engine could not find one of my favorite SNES games, U.N. Squadron. That’s because all of its associated metadata names Area 88, the game’s original title. Thus, I had to modify the metadata database to allow attaching somewhat free-form tags to games in order to compensate. In this case, an alias title would show up in the game’s pseudo-document.

  Roman numerals are still a thorn in my side, just as they were 14 years ago in my original iteration. I dealt with it back then by converting all numbers to Roman numerals during the index and searching processes. I’m not willing to do that for this case and I’m still looking for a good solution.

  Another annoying problem deals with Mega Man, a popular franchise. The proper spelling is 2 words but it’s common for people to mash it into one word, Megaman (see also : Spider-Man, Spiderman, Spider Man). The index doesn’t gracefully deal with that and I have some hacks in place to cope for the time being.

  Positive Results
  I’m pleased with the results so far, and so are the users I have heard from. I know one user expressed amazement that a search for Castlevania turned up Akumajou Densetsu, the Japanese version of Castlevania III : Dracula’s Curse. This didn’t surprise me because I manually added a hint for that mapping. (BTW, if you are a fan of Castlevania III, definitely check out the Akumajou Densetsu soundtrack which has an upgraded version of the same soundtrack using special audio channels.)

  I was a little more surprised when a user announced that searching for ’probotector’ correctly turned up Contra : Hard Corps. I looked into why this was. It turns out that the original chiptune filename was extremely descriptive : "Contra - Hard Corps [Probotector] (1994-08-08)(Konami)". The filenames themselves often carry a bunch of useful metadata which is why it’s important to index those as well.

  And of course, many rippers, dumpers, and taggers have labored for over a decade to lovingly tag these songs with as much composer information as possible, which all gets indexed. The search engine gets a lot of compliments for its ability to find many songs written by favorite composers.

• ffmpeg neon compilation on android - assembler errors

  11 juillet 2012, par Android007

  I am trying to compile ffmpeg for android with neon support , but I am getting following assembler errors. Please let me know if anybody has any clue about this ?

  /home/user1/android-ndk-r5b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc -MMD -MP -MF /home/user1/workspace/FFMPEGFinal/obj/local/armeabi-v7a/objs/ffmpeg/libavcodec/arm/rdft_neon.o.d.org -fpic -ffunction-sections -funwind-tables -fstack-protector -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__  -Wno-psabi -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -O2 -fomit-frame-pointer -fstrict-aliasing -funswitch-loops -finline-limit=300 -I/home/user1/workspace/FFMPEGFinal/jni/SDL/include -I/home/user1/workspace/FFMPEGFinal/jni -DANDROID -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -DCMP_HAVE_NEON -DCMP_HAVE_VFP -fasm -Wa,--noexecstack -O2 -DNDEBUG -g -I/home/user1/android-ndk-r5b/platforms/android-8/arch-arm/usr/include -c  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S -o /home/user1/workspace/FFMPEGFinal/obj/local/armeabi-v7a/objs/ffmpeg/libavcodec/arm/rdft_neon.o && rm -f /home/user1/workspace/FFMPEGFinal/obj/local/armeabi-v7a/objs/ffmpeg/libavcodec/arm/rdft_neon.o.d && mv /home/user1/workspace/FFMPEGFinal/obj/local/armeabi-v7a/objs/ffmpeg/libavcodec/arm/rdft_neon.o.d.org /home/user1/workspace/FFMPEGFinal/obj/local/armeabi-v7a/objs/ffmpeg/libavcodec/arm/rdft_neon.o.d
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S: Assembler messages:
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:54: Error: bad instruction `vld1.32 {d0},[r0,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:55: Error: bad instruction `vld1.32 {d1},[r1,:64],r8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:56: Error: bad instruction `vld1.32 {d4},[r2,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:57: Error: bad instruction `vld1.32 {d5},[r3,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:58: Error: bad instruction `vmov.f32 d18,#0.5'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:59: Error: bad instruction `vdup.32 d19,r6'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:61: Error: selected processor does not support `veor d19,d18,d19'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:62: Error: bad instruction `vmov.i32 d16,#0'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:63: Error: bad instruction `vmov.i32 d17,#1<<31'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:65: Error: bad instruction `vtrn.32 d16,d17'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:67: Error: bad instruction `vrev64.32 d16,d16'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:70: Error: selected processor does not support `veor q1,q0,q8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:71: Error: bad instruction `vld1.32 {d24},[r0,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:72: Error: bad instruction `vadd.f32 d0,d0,d3'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:73: Error: bad instruction `vld1.32 {d25},[r1,:64],r8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:74: Error: bad instruction `vadd.f32 d1,d2,d1'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:75: Error: selected processor does not support `veor q3,q12,q8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:77: Error: bad instruction `vmul.f32 q10,q0,q9'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:79: Error: bad instruction `vadd.f32 d0,d24,d7'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:80: Error: bad instruction `vadd.f32 d1,d6,d25'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:81: Error: bad instruction `vmul.f32 q11,q0,q9'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:82: Error: selected processor does not support `veor d7,d21,d16'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:83: Error: bad instruction `vrev64.32 d3,d21'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:84: Error: selected processor does not support `veor d6,d20,d17'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:85: Error: selected processor does not support `veor d2,d3,d16'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:86: Error: bad instruction `vmla.f32 d20,d3,d4[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:87: Error: bad instruction `vmla.f32 d20,d7,d5[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:88: Error: bad instruction `vmla.f32 d6,d2,d4[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:89: Error: bad instruction `vmla.f32 d6,d21,d5[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:90: Error: bad instruction `vld1.32 {d4},[r2,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:91: Error: selected processor does not support `veor d7,d23,d16'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:92: Error: bad instruction `vld1.32 {d5},[r3,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:93: Error: selected processor does not support `veor d24,d22,d17'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:94: Error: bad instruction `vrev64.32 d3,d23'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:96: Error: selected processor does not support `veor d2,d3,d16'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:98: Error: bad instruction `vmla.f32 d22,d3,d4[0]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:99: Error: bad instruction `vmla.f32 d22,d7,d5[0]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:100: Error: bad instruction `vmla.f32 d24,d2,d4[0]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:101: Error: bad instruction `vmla.f32 d24,d23,d5[0]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:102: Error: bad instruction `vld1.32 {d0},[r0,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:103: Error: bad instruction `vld1.32 {d1},[r1,:64],r8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:104: Error: bad instruction `vst1.32 {d20},[r7,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:105: Error: bad instruction `vst1.32 {d6},[lr,:64],r8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:106: Error: bad instruction `vst1.32 {d22},[r7,:64]!'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:107: Error: bad instruction `vst1.32 {d24},[lr,:64],r8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:111: Error: selected processor does not support `veor q1,q0,q8'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:112: Error: bad instruction `vadd.f32 d0,d0,d3'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:113: Error: bad instruction `vadd.f32 d1,d2,d1'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:115: Error: bad instruction `vmul.f32 q10,q0,q9'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:118: Error: bad instruction `vld1.32 {d0[0]},[r0,:32]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:119: Error: selected processor does not support `veor d7,d21,d16'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:120: Error: bad instruction `vrev64.32 d3,d21'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:121: Error: selected processor does not support `veor d6,d20,d17'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:122: Error: bad instruction `vld1.32 {d22},[r5,:64]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:123: Error: bad instruction `vdup.32 d1,r2'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:124: Error: selected FPU does not support instruction -- `vmov d23,d22'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:125: Error: selected processor does not support `veor d2,d3,d16'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:126: Error: bad instruction `vtrn.32 d22,d23'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:127: Error: selected processor does not support `veor d0,d0,d1'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:128: Error: selected processor does not support `veor d23,d23,d17'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:129: Error: bad instruction `vmla.f32 d20,d3,d4[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:130: Error: bad instruction `vmla.f32 d20,d7,d5[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:131: Error: bad instruction `vmla.f32 d6,d2,d4[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:132: Error: bad instruction `vmla.f32 d6,d21,d5[1]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:133: Error: bad instruction `vadd.f32 d22,d22,d23'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:134: Error: bad instruction `vst1.32 {d20},[r7,:64]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:135: Error: bad instruction `vst1.32 {d6},[lr,:64]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:136: Error: bad instruction `vst1.32 {d0[0]},[r0,:32]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:137: Error: bad instruction `vst1.32 {d22},[r5,:64]'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:142: Error: bad instruction `vmul.f32 d22,d22,d18'
  
  /home/user1/workspace/FFMPEGFinal/jni/libavcodec/arm/rdft_neon.S:143: Error: bad instruction `vst1.32 {d22},[r5,:64]'
  
  make: *** [/home/user1/workspace/FFMPEGFinal/obj/local/armeabi-v7a/objs/ffmpeg/libavcodec/arm/rdft_neon.o] Error 1

• Extract Video Frames In Python

  22 avril 2017, par TheNone

  I want to extract video frames and save them as image.

  import os, sys
  
  from PIL import Image
  
  
  
  a, b, c = os.popen3("ffmpeg -i test.avi")
  
  out = c.read()
  
  dp = out.index("Duration: ")
  
  duration = out[dp+10:dp+out[dp:].index(",")]
  
  hh, mm, ss = map(float, duration.split(":"))
  
  total = (hh*60 + mm)*60 + ss
  
  for i in xrange(9):
  
      t = (i + 1) * total / 10
  
      os.system("ffmpeg -i test.avi -ss %0.3fs frame%i.png" % (t, i))

  But I have this error :

  FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
  
  Mac OSX universal build for ffmpegX
  
    configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
  
    libavutil version: 49.0.0
  
    libavcodec version: 51.9.0
  
    libavformat version: 50.4.0
  
    built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
  
  Input #0, avi, from 'test.avi':
  
    Duration: 00:00:30.5, start: 0.000000, bitrate: 465 kb/s
  
    Stream #0.0, 25.00 fps(r): Video: mpeg4, yuv420p, 640x480
  
    Stream #0.1: Audio: mp3, 32000 Hz, mono, 32 kb/s
  
  Unable for find a suitable output format for 'frame0.png'

  Edit : ffmpeg -formats

  FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
  
  Mac OSX universal build for ffmpegX
  
    configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
  
    libavutil version: 49.0.0
  
    libavcodec version: 51.9.0
  
    libavformat version: 50.4.0
  
    built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
  
  File formats:
  
    E 3g2             3gp2 format
  
    E 3gp             3gp format
  
   D  4xm             4X Technologies format
  
   D  RoQ             Id RoQ format
  
   D  aac             ADTS AAC
  
   DE ac3             raw ac3
  
    E adts            ADTS AAC
  
   DE aiff            Audio IFF
  
   DE alaw            pcm A law format
  
   DE amr             3gpp amr file format
  
   DE asf             asf format
  
    E asf_stream      asf format
  
   DE au              SUN AU Format
  
   DE avi             avi format
  
   D  avs             avs format
  
    E crc             crc testing format
  
   D  daud            D-Cinema audio format
  
   D  dts             raw dts
  
   DE dv              DV video format
  
    E dvd             MPEG2 PS format (DVD VOB)
  
   D  ea              Electronic Arts Multimedia Format
  
   DE ffm             ffm format
  
   D  film_cpk        Sega FILM/CPK format
  
   D  flic            FLI/FLC/FLX animation format
  
   DE flv             flv format
  
    E framecrc        framecrc testing format
  
   DE gif             GIF Animation
  
   DE h261            raw h261
  
   DE h263            raw h263
  
   DE h264            raw H264 video format
  
   D  idcin           Id CIN format
  
   DE image           image sequence
  
   DE image2          image2 sequence
  
   DE image2pipe      piped image2 sequence
  
   DE imagepipe       piped image sequence
  
   D  ingenient       Ingenient MJPEG
  
   D  ipmovie         Interplay MVE format
  
   DE m4v             raw MPEG4 video format
  
   D  matroska        Matroska file format
  
   DE mjpeg           MJPEG video
  
   D  mm              American Laser Games MM format
  
   DE mmf             mmf format
  
    E mov             mov format
  
   D  mov,mp4,m4a,3gp,3g2,mj2 QuickTime/MPEG4/Motion JPEG 2000 format
  
    E mp2             MPEG audio layer 2
  
   DE mp3             MPEG audio layer 3
  
    E mp4             mp4 format
  
   DE mpeg            MPEG1 System format
  
    E mpeg1video      MPEG video
  
    E mpeg2video      MPEG2 video
  
   DE mpegts          MPEG2 transport stream format
  
   D  mpegvideo       MPEG video
  
    E mpjpeg          Mime multipart JPEG format
  
   DE mulaw           pcm mu law format
  
   D  nsv             NullSoft Video format
  
    E null            null video format
  
   DE nut             nut format
  
   D  nuv             NuppelVideo format
  
   D  ogg             Ogg
  
    E psp             psp mp4 format
  
   D  psxstr          Sony Playstation STR format
  
   DE rawvideo        raw video format
  
   D  redir           Redirector format
  
   DE rm              rm format
  
    E rtp             RTP output format
  
   D  rtsp            RTSP input format
  
   DE s16be           pcm signed 16 bit big endian format
  
   DE s16le           pcm signed 16 bit little endian format
  
   DE s8              pcm signed 8 bit format
  
   D  sdp             SDP
  
   D  shn             raw shorten
  
   D  smk             Smacker Video
  
   D  sol             Sierra SOL Format
  
    E svcd            MPEG2 PS format (VOB)
  
   DE swf             Flash format
  
   D  tta             true-audio
  
   DE u16be           pcm unsigned 16 bit big endian format
  
   DE u16le           pcm unsigned 16 bit little endian format
  
   DE u8              pcm unsigned 8 bit format
  
    E vcd             MPEG1 System format (VCD)
  
   D  vmd             Sierra VMD format
  
    E vob             MPEG2 PS format (VOB)
  
   DE voc             Creative Voice File format
  
   DE wav             wav format
  
   D  wc3movie        Wing Commander III movie format
  
   D  wsaud           Westwood Studios audio format
  
   D  wsvqa           Westwood Studios VQA format
  
   DE yuv4mpegpipe    YUV4MPEG pipe format
  
  
  
  Image formats (filename extensions, if any, follow):
  
   DE gif    gif
  
  
  
  Codecs:
  
   D V    4xm
  
   D V D  8bps
  
   DEA    aac
  
   D V D  aasc
  
   DEA    ac3
  
   DEA    adpcm_4xm
  
   DEA    adpcm_adx
  
   DEA    adpcm_ct
  
   DEA    adpcm_ea
  
   DEA    adpcm_ima_dk3
  
   DEA    adpcm_ima_dk4
  
   DEA    adpcm_ima_qt
  
   DEA    adpcm_ima_smjpeg
  
   DEA    adpcm_ima_wav
  
   DEA    adpcm_ima_ws
  
   DEA    adpcm_ms
  
   DEA    adpcm_sbpro_2
  
   DEA    adpcm_sbpro_3
  
   DEA    adpcm_sbpro_4
  
   DEA    adpcm_swf
  
   DEA    adpcm_xa
  
   DEA    adpcm_yamaha
  
   D A    alac
  
   DEA    amr_nb
  
   DEA    amr_wb
  
   DEV D  asv1
  
   DEV D  asv2
  
   D V D  avs
  
   D V    bmp
  
   D V D  camstudio
  
   D V D  camtasia
  
   D V D  cinepak
  
   D V D  cljr
  
   D A    cook
  
   D V D  cyuv
  
   DES    dvbsub
  
   DES    dvdsub
  
   DEV D  dvvideo
  
   DEV D  ffv1
  
   DEVSD  ffvhuff
  
   D A    flac
  
   D V D  flic
  
   DEVSD  flv
  
   D V D  fraps
  
   DEA    g726
  
   DEV D  h261
  
   DEVSDT h263
  
   D VSD  h263i
  
    EV    h263p
  
   DEV DT h264
  
   DEVSD  huffyuv
  
   D V D  idcinvideo
  
   D V D  indeo2
  
   D V    indeo3
  
   D A    interplay_dpcm
  
   D V D  interplayvideo
  
    EV    jpegls
  
   D V    kmvc
  
    EV    ljpeg
  
   D V D  loco
  
   D A    mace3
  
   D A    mace6
  
   D V D  mdec
  
   DEV D  mjpeg
  
   D V D  mjpegb
  
   D V D  mmvideo
  
   DEA    mp2
  
   DEA    mp3
  
   D A    mp3adu
  
   D A    mp3on4
  
   DEVSDT mpeg1video
  
   DEVSDT mpeg2video
  
   DEVSDT mpeg4
  
   D A    mpeg4aac
  
   D VSDT mpegvideo
  
   DEVSD  msmpeg4
  
   DEVSD  msmpeg4v1
  
   DEVSD  msmpeg4v2
  
   D V D  msrle
  
   D V D  msvideo1
  
   D V D  mszh
  
   D V D  nuv
  
   DEV    pam
  
   DEV    pbm
  
   DEA    pcm_alaw
  
   DEA    pcm_mulaw
  
   DEA    pcm_s16be
  
   DEA    pcm_s16le
  
   DEA    pcm_s24be
  
   DEA    pcm_s24daud
  
   DEA    pcm_s24le
  
   DEA    pcm_s32be
  
   DEA    pcm_s32le
  
   DEA    pcm_s8
  
   DEA    pcm_u16be
  
   DEA    pcm_u16le
  
   DEA    pcm_u24be
  
   DEA    pcm_u24le
  
   DEA    pcm_u32be
  
   DEA    pcm_u32le
  
   DEA    pcm_u8
  
   DEV    pgm
  
   DEV    pgmyuv
  
   DEV    png
  
   DEV    ppm
  
   D A    qdm2
  
   D V D  qdraw
  
   D V D  qpeg
  
   D V D  qtrle
  
   DEV    rawvideo
  
   D A    real_144
  
   D A    real_288
  
   D A    roq_dpcm
  
   D V D  roqvideo
  
   D V D  rpza
  
   DEV D  rv10
  
   DEV D  rv20
  
   D A    shorten
  
   D A    smackaud
  
   D V    smackvid
  
   D V D  smc
  
   DEV    snow
  
   D A    sol_dpcm
  
   DEA    sonic
  
    EA    sonicls
  
   D V D  sp5x
  
   DEV D  svq1
  
   D VSD  svq3
  
   D V    theora
  
   D V D  truemotion1
  
   D V D  truemotion2
  
   D A    truespeech
  
   D A    tta
  
   D V D  ultimotion
  
   D V    vc9
  
   D V D  vcr1
  
   D A    vmdaudio
  
   D V D  vmdvideo
  
   D A    vorbis
  
   D V    vp3
  
   D V D  vqavideo
  
   D A    wmav1
  
   D A    wmav2
  
   DEVSD  wmv1
  
   DEVSD  wmv2
  
   D V D  wnv1
  
   D A    ws_snd1
  
   D A    xan_dpcm
  
   D V D  xan_wc3
  
   D V D  xl
  
    EV    xvid
  
   DEV D  zlib
  
   D V    zmbv
  
  
  
  Supported file protocols:
  
   file: pipe: udp: rtp: tcp: http:
  
  Frame size, frame rate abbreviations:
  
   ntsc pal qntsc qpal sntsc spal film ntsc-film sqcif qcif cif 4cif
  
  Motion estimation methods:
  
   zero(fastest) full(slowest) log phods epzs(default) x1 hex umh iter
  
  
  
  Note, the names of encoders and decoders dont always match, so there are
  
  several cases where the above table shows encoder only or decoder only entries
  
  even though both encoding and decoding are supported for example, the h263
  
  decoder corresponds to the h263 and h263p encoders, for file formats its even
  
  worse

  What is wrong in my code ? Thanks in advance