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• Dreamcast Track Sizes

  1er mars 2015, par Multimedia Mike — Sega Dreamcast

  I’ve been playing around with Sega Dreamcast discs lately. Not playing the games on the DC discs, of course, just studying their structure. To review, the Sega Dreamcast game console used special optical discs named GD-ROMs, where the GD stands for “gigadisc”. They are capable of holding about 1 gigabyte of data.

  You know what’s weird about these discs ? Each one manages to actually store a gigabyte of data. Each disc has a CD portion and a GD portion. The CD portion occupies the first 45000 sectors and can be read in any standard CD drive. This area is divided between a brief data track and a brief (usually) audio track.

  The GD region starts at sector 45000. Sometimes, it’s just one humongous data track that consumes the entire GD region. More often, however, the data track is split between the first track and the last track in the region and there are 1 or more audio tracks in between. But the weird thing is, the GD region is always full. I made a study of it (click for a larger, interactive graph) :

  
  
  

  Some discs put special data or audio bonuses in the CD region for players to discover. But every disc manages to fill out the GD region. I checked up on a lot of those audio tracks that divide the GD data and they’re legitimate music tracks. So what’s the motivation ? Why would the data track be split in 2 pieces like that ?

  I eventually realized that I probably answered this question in this blog post from 4 years ago. The read speed from the outside of an optical disc is higher than the inside of the same disc. When I inspect the outer data tracks of some of these discs, sure enough, there seem to be timing-sensitive multimedia FMV files living on the outer stretches.

  One day, I’ll write a utility to take apart the split ISO-9660 filesystem offset from a weird sector.

• Stremio::FFMPEG Error while opening encoder for output stream #0:1

  28 février 2015, par user2547496

  Getting this error using Stremio::FFMPEG wrapper for converting /MOV to .MP4

  Error while opening encoder for output stream #0:1 - maybe incorrect     parameters such as bit_rate, rate, width or height

  Here are my commands

  require 'streamio-ffmpeg'
  
  movie = FFMPEG::Movie.new("tmp/movie.ogg")
  
  movie.transcode("tmp/movie.mp4")

  Here’s the output =>

  Running transcoding...
  
  ffmpeg -y -i tmp/movie.ogg  tmp/movie.mp4
  
  
  
  E, [2015-02-28T03:06:00.797778 #6381] ERROR -- : Failed encoding...
  
  ffmpeg -y -i tmp/movie.ogg  tmp/movie.mp4
  
  
  
  Output #0, mp4, to 'tmp/movie.mp4':
  
      Stream #0:0: Video: h264, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 90k tbn, 24 tbc
  
  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (theora -> libx264)
  
    Stream #0:1 -> #0:1 (flac -> libaacplus)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  
  
  Errors: encoded file is invalid. 
  
  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (theora -> libx264)
  
    Stream #0:1 -> #0:1 (flac -> libaacplus)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

• Andoid NDK , FFMpeg : Unrecognised option filter_complex

  27 février 2015, par Gaganpreet Singh

  I am creating watermark application using ffmpeg in android.
  I used following command

  ffmpeg -i /storage/emulated/0/WhatsApp/Media/WhatsApp Video/VID-20150217-WA0002.mp4 -i /storage/emulated/0/mp4parser/img001.png -filter_complex '[0:v][1:v]overlay[out]'  -map '[out]' /storage/emulated/0/WhatsApp/Media/WhatsApp Video/trimmed-038-VID-20150217-WA0002.mp4

  When I launched app I get This line in log :

  Unrecognized option 'filter_complex'

  I have read this command on FFmpeg.org site, but don’t know why it is not working. I am mentioning log below.Please Help

  02-27 16:14:55.881: E/VideoTrimmer(13315): Starting to watermark
  
  02-27 16:14:55.881: E/VideoTrimmer(13315): ffmpeg
  
  02-27 16:14:55.881: E/VideoTrimmer(13315): -i
  
  02-27 16:14:55.881: E/VideoTrimmer(13315): /storage/emulated/0/WhatsApp/Media/WhatsApp Video/VID-20150217-WA0002.mp4
  
  02-27 16:14:55.881: E/VideoTrimmer(13315): -i
  
  02-27 16:14:55.882: E/VideoTrimmer(13315): /storage/emulated/0/mp4parser/img001.png
  
  02-27 16:14:55.882: E/VideoTrimmer(13315): -filter_complex
  
  02-27 16:14:55.882: E/VideoTrimmer(13315): '[0:v][1:v]overlay[out]'
  
  02-27 16:14:55.882: E/VideoTrimmer(13315): -map
  
  02-27 16:14:55.882: E/VideoTrimmer(13315): '[out]'
  
  02-27 16:14:55.883: E/VideoTrimmer(13315): /storage/emulated/0/WhatsApp/Media/WhatsApp Video/trimmed-038-VID-20150217-WA0002.mp4
  
  02-27 16:14:55.883: E/VideoTrimmer(13315): Printed all
  
  02-27 16:14:55.944: E/TakePics(13315): FFmpeg version 0.6.1, Copyright (c) 2000-2010 the FFmpeg developers
  
  02-27 16:14:55.944: E/TakePics(13315):   built on Feb 27 2015 16:12:28 with gcc 4.8
  
  02-27 16:14:55.944: E/TakePics(13315):   configuration: --target-os=linux --arch=arm --enable-version3 --enable-gpl --enable-nonfree --disable-stripping --disable-ffmpeg --disable-ffplay --disable-ffserver --disable-ffprobe --disable-devices --disable-protocols --enable-protocol=file --enable-avfilter --disable-network --disable-mpegaudio-hp --disable-avdevice --enable-cross-compile --cc=/home/uday/mount/android-ndk-r4b/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi-gcc --cross-prefix=/home/uday/mount/android-ndk-r4b/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi- --nm=/home/uday/mount/android-ndk-r4b/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi-nm --extra-cflags='-fPIC -DANDROID' --disable-asm --enable-neon --enable-armv5te --extra-ldflags='-Wl,-T,/home/uday/mount/android-ndk-r4b/build/prebuilt/linux-x86/arm-eabi-4.4.0/arm-eabi/lib/ldscripts/armelf.x -Wl,-rpath-link=/home/uday/mount/android-ndk-r4b/build/platforms/android-8/arch-arm/usr/lib -L/home/uday/mount/android-ndk-r4b/build/platforms/android-8/arch-arm/usr/lib -nostdli
  
  02-27 16:14:56.152: E/TakePics(13315): Unrecognized option 'filter_complex'

  I have also tried using filter:v.