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• FFmpeg convert .mov to .ogv

  24 juillet 2016, par Morten Hauberg

  I have some troubles converting my .mov to a .ogg file using FFmpeg.

  This command should work, right ?

  ffmpeg -i test.mov -s 640x320 -vcodec libtheora -acodec libvorbis out.ogv

  It gives me this output

  [0] => FFmpeg version SVN-r0.5.9-4:0.5.9-1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
  [1] =>   configuration: --extra-version=4:0.5.9-1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libdirac --enable-libgsm --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libfaad --enable-libdc1394 --enable-shared --disable-static
  
  [2] =>   libavutil     49.15. 0 / 49.15. 0
  
  [3] =>   libavcodec    52.20. 1 / 52.20. 1
  
  [4] =>   libavformat   52.31. 0 / 52.31. 0
  
  [5] =>   libavdevice   52. 1. 0 / 52. 1. 0
  
  [6] =>   libavfilter    0. 4. 0 /  0. 4. 0
  
  [7] =>   libswscale     0. 7. 1 /  0. 7. 1
  
  [8] =>   libpostproc   51. 2. 0 / 51. 2. 0
  
  [9] =>   built on Jun 10 2012 08:33:06, gcc: 4.4.5
  
  [10] => 
  
  [11] => Seems stream 0 codec frame rate differs from container frame rate: 1200.00 (1200/1) -> 30.00 (30/1)
  
  [12] => Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
  
  [13] =>   Duration: 00:00:06.26, start: 0.000000, bitrate: 809 kb/s
  
  [14] =>     Stream #0.0(und): Video: h264, yuv420p, 480x360, 30 tbr, 600 tbn, 1200 tbc
  
  [15] =>     Stream #0.1(und): Audio: aac, 44100 Hz, mono, s16
  
  [16] => Output #0, ogg, to 'out.ogv':
  
  [17] =>     Stream #0.0(und): Video: libtheora, yuv420p, 640x320, q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
  [18] =>     Stream #0.1(und): Audio: vorbis, 44100 Hz, mono, s16, 64 kb/s
  
  [19] => Stream mapping:
  
  [20] =>   Stream #0.0 -> #0.0
  
  [21] =>   Stream #0.1 -> #0.1
  
  [22] => Press [q] to stop encoding

  It seems right, right ?

  But the movie is only about 1 second long.
  Why is that ?

  I do not have access to ffmpeg2theora, so please dont suggest that :)

• Translating Return To Ringworld

  17 août 2016, par Multimedia Mike — Game Hacking

  As indicated in my previous post, the Translator has expressed interest in applying his hobby towards another DOS adventure game from the mid 1990s : Return to Ringworld (henceforth R2RW) by Tsunami Media. This represents significantly more work than the previous outing, Phantasmagoria.

  
  
  Return to Ringworld Title Screen
  

  I have been largely successful thus far in crafting translation tools. I have pushed the fruits of these labors to a Github repository named improved-spoon (named using Github’s random name generator because I wanted something more interesting than ‘game-hacking-tools’).

  Further, I have recorded everything I have learned about the game’s resource format (named RLB) at the XentaxWiki.

  New Challenges
  The previous project mostly involved scribbling subtitle text on an endless series of video files by leveraging a separate software library which took care of rendering fonts. In contrast, R2RW has at least 30k words of English text contained in various blocks which require translation. Further, the game encodes its own fonts (9 of them) which stubbornly refuse to be useful for rendering text in nearly any other language.

  Thus, the immediate 2 challenges are :
  

  1. Translating volumes of text to Spanish
  2. Expanding the fonts to represent Spanish characters

  Normally, “figuring out the file format data structures involved” is on the list as well. Thankfully, understanding the formats is not a huge challenge since the folks at the ScummVM project already did all the heavy lifting of reverse engineering the file formats.

  The Pitch
  Here was the plan :

  • Create a tool that can dump out the interesting data from the game’s master resource file.
  • Create a tool that can perform the elaborate file copy described in the previous post. The new file should be bit for bit compatible with the original file.
  • Modify the rewriting tool to repack some modified strings into the new resource file.
  • Unpack the fonts and figure out a way to add new characters.
  • Repack the new fonts into the resource file.
  • Repack message strings with Spanish characters.

  Showing The Work : Modifying Strings
  First, I created the tool to unpack blocks of message string resources. I elected to dump the strings to disk as JSON data since it’s easy to write and read JSON using Python, and it’s quick to check if any mistakes have crept in.

  The next step is to find a string to focus on. So I started the game and looked for the first string I could trigger :

  
  
  

  This shows up in the JSON string dump as :

    
      "Spanish" : " !0205Your quarters on the Lance of Truth are spartan, in accord with your mercenary lifestyle.",
      "English" : " !0205Your quarters on the Lance of Truth are spartan, in accord with your mercenary lifestyle."
    ,
  

  As you can see, many of the strings are encoded with an ID key as part of the string which should probably be left unmodified. I changed the Spanish string :

    
      "Spanish" : " !0205Hey, is this thing on ?",
      "English" : " !0205Your quarters on the Lance of Truth are spartan, in accord with your mercenary lifestyle."
    ,
  

  And then I wrote the repacking tool to substitute this message block for the original one. Look ! The engine liked it !

  
  
  

  Little steps, little steps.

  Showing The Work : Modifying Fonts
  The next little step is to find a place to put the new characters. First, a problem definition : The immediate goal is to translate the game into Spanish. The current fonts encoded in the game resource only support 128 characters, corresponding to 7-bit ASCII. In order to properly express Spanish, 16 new characters are required : á, é, í, ó, ú, ü, ñ (each in upper and lower case for a total of 14 characters) as well as the inverted punctuation symbols : ¿, ¡.

  Again, ScummVM already documents (via code) the font coding format. So I quickly determined that each of the 9 fonts is comprised of 128 individual bitmaps with either 1 or 2 bits per pixel. I wrote a tool to unpack each character into an individual portable grey map (PGM) image. These can be edited with graphics editors or with text editors since they are just text files.

  Where to put the 16 new Spanish characters ? ASCII characters 1-31 are non-printable, so my first theory was that these characters would be empty and could be repurposed. However, after dumping and inspecting, I learned that they represent the same set of characters as seen in DOS Code Page 437. So that’s a no-go (so I assumed ; I didn’t check if any existing strings leveraged those characters).

  My next plan was hope that I could extend the font beyond index 127 and use positions 128-143. This worked superbly. This is the new example string :

    
      "Spanish" : " !0205¿Ves esto ? ¡La puntuacion se hace girar !",
      "English" : " !0205Your quarters on the Lance of Truth are spartan, in accord with your mercenary lifestyle."
    ,
  

  Fortunately, JSON understands UTF-8 and after mapping the 16 necessary characters down to the numeric range of 128-143, I repacked the new fonts and the new string :

  
  
  Translation : “See this ? The punctuation is rotated !”
  

  Another victory. Notice that there are no diacritics in this string. None are required for this translation (according to Google Translate). But adding the diacritics to the 14 characters isn’t my department. My tool does help by prepopulating [aeiounAEIOUN] into the right positions to make editing easier for the Translator. But the tool does make the effort to rotate the punctuation since that is easy to automate.

  Next Steps and Residual Weirdness
  There is another method for storing ASCII text inside the R2RW resource called strip resources. These store conversation scripts. There are plenty of fields in the data structures that I don’t fully understand. So, following the lessons I learned from my previous translation outing, I was determined to modify as little as possible. This means copying over most of the original data structures intact, but changing the field representing the relative offset that points to the corresponding string. This works well since the strings are invariably stored NULL-terminated in a concatenated manner.

  I wanted to document for the record that the format that R2RW uses has some weirdness in they way it handles residual bytes in a resource. The variant of the resource format that R2RW uses requires every block to be aligned on a 16-byte boundary. If there is space between the logical end of the resource and the start of the next resource, there are random bytes in that space. This leads me to believe that these bytes were originally recorded from stale/uninitialized memory. This frustrates me because when I write the initial file copy tool which unpacks and repacks each block, I want the new file to be identical to the original. However, these apparent nonsense bytes at the end thwart that effort.

  But leaving those bytes as 0 produces an acceptable resource file.

  Text On Static Images
  There is one last resource type we are working on translating. There are various bits of text that are rendered as images. For example, from the intro :

  
  
  

  It’s possible to locate and extract the exact image that is overlaid on this scene, though without the colors :

  
  
  

  The palettes are stored in a separate resource type. So it seems the challenge is to figure out the palette in use for these frames and render a transparent image that uses the same palette, then repack the new text-image into the new resource file.

  The post Translating Return To Ringworld first appeared on Breaking Eggs And Making Omelettes.

• Change AVI creation date with ffmpeg ?

  1er novembre 2016, par brock

  As far as I can tell the following ffmpeg command should copy all existing metadata in the input file to the output file and modify the specified field in the output file :

  ffmpeg -i VID_20130502_220104.avi -metadata creation_time="2013-05-02 22:01:04" -codec copy VID_20130502_220104-2.avi

  Instead, it seems to strip all metadata from the output file. Here is the output of a few commands. I am going nuts. I think this should work, but why is it not ?

  Command to edit the creation time :

  ffmpeg -i VID_20130502_220104.avi -metadata creation_time="2013-05-02 22:01:04" -codec copy VID_20130502_220104-2.avi
  
  
  
  ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Input #0, avi, from 'VID_20130502_220104.avi':
  
    Metadata:
  
      encoder         : 
  
      maker           : NIKON
  
      model           : COOLPIX S4300
  
      creation_time   : 2011-01-01 00:00:00
  
    Duration: 00:01:30.50, start: 0.000000, bitrate: 32135 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
  
  [avi @ 000000000032ad40] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  Output #0, avi, to 'VID_20130502_220104-2.avi':
  
    Metadata:
  
      creation_time   : 2013-05-02 22:01:04
  
      maker           : NIKON
  
      model           : COOLPIX S4300
  
      ISFT            : Lavf57.41.100
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, q=2-31, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, 352 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  891 fps=0.0 q=-1.0 size=  116171kB time=00:00:29.69 bitrate=32043.1kbits/s speed=59.4x    
  
  frame= 1739 fps=1739 q=-1.0 size=  227191kB time=00:00:57.96 bitrate=32107.5kbits/s speed=  58x    
  
  frame= 2609 fps=1739 q=-1.0 size=  340940kB time=00:01:26.96 bitrate=32115.9kbits/s speed=  58x    
  
  frame= 2715 fps=1734 q=-1.0 Lsize=  355018kB time=00:01:30.49 bitrate=32136.3kbits/s speed=57.8x    
  
  video:350984kB audio:3897kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.038597%

  Command to inspect the output file metadata with ffmpeg :

  ffmpeg -i VID_20130502_220104-2.avi
  
  
  
  ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Input #0, avi, from 'VID_20130502_220104-2.avi':
  
    Metadata:
  
      encoder         : Lavf57.41.100
  
    Duration: 00:01:30.50, start: 0.000000, bitrate: 32136 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
  
  At least one output file must be specified

  Command to inspect the input file metadata with exiftool :

  exiftool.exe VID_20130502_220104.avi
  
  
  
  ExifTool Version Number         : 10.30
  
  File Name                       : VID_20130502_220104.avi
  
  Directory                       : .
  
  File Size                       : 347 MB
  
  File Modification Date/Time     : 2013:05:13 16:33:52-04:00
  
  File Access Date/Time           : 2015:11:10 23:08:25-05:00
  
  File Creation Date/Time         : 2015:11:10 23:08:25-05:00
  
  File Permissions                : rw-rw-rw-
  
  File Type                       : AVI
  
  File Type Extension             : avi
  
  MIME Type                       : video/x-msvideo
  
  Frame Rate                      : 30
  
  Max Data Rate                   : 488.3 kB/s
  
  Frame Count                     : 2715
  
  Stream Count                    : 2
  
  Stream Type                     : Video
  
  Video Codec                     : mjpg
  
  Video Frame Rate                : 30
  
  Video Frame Count               : 2715
  
  Quality                         : 10000
  
  Sample Size                     : Variable
  
  Image Width                     : 1280
  
  Image Height                    : 720
  
  Planes                          : 1
  
  Bit Depth                       : 24
  
  Compression                     : MJPG
  
  Image Length                    : 2764800
  
  Pixels Per Meter X              : 0
  
  Pixels Per Meter Y              : 0
  
  Num Colors                      : Use BitDepth
  
  Num Important Colors            : All
  
  Audio Codec                     : 
  
  Audio Sample Rate               : 22050
  
  Audio Sample Count              : 1995256
  
  Encoding                        : Microsoft PCM
  
  Num Channels                    : 1
  
  Sample Rate                     : 22050
  
  Avg Bytes Per Sec               : 44100
  
  Bits Per Sample                 : 16
  
  Maker Note Type                 : NIKON
  
  Maker Note Version              : 0.1.0.0
  
  Make                            : NIKON
  
  Model                           : COOLPIX S4300
  
  Software                        : V1.0
  
  Equipment                       : NIKON DIGITAL CAMERA
  
  Orientation                     : Horizontal (normal)
  
  Exposure Time                   : 1/15
  
  F Number                        : 3.5
  
  Exposure Compensation           : 0
  
  Max Aperture Value              : 3.2
  
  Metering Mode                   : Multi-segment
  
  Focal Length                    : 4.6 mm
  
  X Resolution                    : 72
  
  Y Resolution                    : 72
  
  Resolution Unit                 : inches
  
  Date/Time Original              : 2011:01:01 00:00:00
  
  Create Date                     : 2011:01:01 00:00:00
  
  Focus Mode                      : AF-S
  
  Digital Zoom                    : 1
  
  Color Mode                      : COLOR
  
  Sharpness                       : AUTO
  
  White Balance                   : NORMAL
  
  Noise Reduction                 : OFF
  
  Thumbnail Image                 : (Binary data 3082 bytes, use -b option to extract)
  
  Aperture                        : 3.5
  
  Duration                        : 0:01:30
  
  Image Size                      : 1280x720
  
  Megapixels                      : 0.922
  
  Shutter Speed                   : 1/15
  
  Focal Length                    : 4.6 mm

  Command to inspect the output file metadata with exiftool :

  exiftool.exe VID_20130502_220104-2.avi
  
  
  
  ExifTool Version Number         : 10.30
  
  File Name                       : VID_20130502_220104-2.avi
  
  Directory                       : .
  
  File Size                       : 347 MB
  
  File Modification Date/Time     : 2016:11:01 00:17:38-04:00
  
  File Access Date/Time           : 2016:11:01 00:17:36-04:00
  
  File Creation Date/Time         : 2016:11:01 00:15:18-04:00
  
  File Permissions                : rw-rw-rw-
  
  File Type                       : AVI
  
  File Type Extension             : avi
  
  MIME Type                       : video/x-msvideo
  
  Frame Rate                      : 30
  
  Max Data Rate                   : 3923 kB/s
  
  Frame Count                     : 2715
  
  Stream Count                    : 2
  
  Stream Type                     : Video
  
  Video Codec                     : MJPG
  
  Video Frame Rate                : 30
  
  Video Frame Count               : 2715
  
  Quality                         : Default
  
  Sample Size                     : Variable
  
  Image Width                     : 1280
  
  Image Height                    : 720
  
  Planes                          : 1
  
  Bit Depth                       : 24
  
  Compression                     : MJPG
  
  Image Length                    : 2764800
  
  Pixels Per Meter X              : 0
  
  Pixels Per Meter Y              : 0
  
  Num Colors                      : Use BitDepth
  
  Num Important Colors            : All
  
  Audio Codec                     : .
  
  Audio Sample Rate               : 22050
  
  Audio Sample Count              : 1995256
  
  Encoding                        : Microsoft PCM
  
  Num Channels                    : 1
  
  Sample Rate                     : 22050
  
  Avg Bytes Per Sec               : 44100
  
  Bits Per Sample                 : 16
  
  Software                        : Lavf57.41.100
  
  Duration                        : 0:01:30
  
  Image Size                      : 1280x720
  
  Megapixels                      : 0.922