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Granite de l’Aber Ildut
9 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
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Mis à jour : Août 2018
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Autres articles (74)
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Les autorisations surchargées par les plugins
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autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
MediaSPIP Player : problèmes potentiels
22 février 2011, parLe lecteur ne fonctionne pas sur Internet Explorer
Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...)
Sur d’autres sites (4480)
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Parsing The Clue Chronicles
30 décembre 2018, par Multimedia Mike — Game HackingA long time ago, I procured a 1999 game called Clue Chronicles : Fatal Illusion, based on the classic board game Clue, a.k.a. Cluedo. At the time, I was big into collecting old, unloved PC games so that I could research obscure multimedia formats.
Surveying the 3 CD-ROMs contained in the box packaging revealed only Smacker (SMK) videos for full motion video which was nothing new to me or the multimedia hacking community at the time. Studying the mix of data formats present on the discs, I found a selection of straightforward formats such as WAV for audio and BMP for still images. I generally find myself more fascinated by how computer games are constructed rather than by playing them, and this mix of files has always triggered a strong “I could implement a new engine for this !” feeling in me, perhaps as part of the ScummVM project which already provides the core infrastructure for reimplementing engines for 2D adventure games.
Tying all of the assets together is a custom high-level programming language. I have touched on this before in a blog post over a decade ago. The scripts are in a series of files bearing the extension .ini (usually reserved for configuration scripts, but we’ll let that slide). A representative sample of such a script can be found here :
What Is This Language ?
At the time I first analyzed this language, I was still primarily a C/C++-minded programmer, with a decent amount of Perl experience as a high level language, and had just started to explore Python. I assessed this language to be “mildly object oriented with C++-type comments (‘//’) and reliant upon a number of implicit library functions”. Other people saw other properties. When I look at it nowadays, it reminds me a bit more of JavaScript than C++. I think it’s sort of a Rorschach test for programming languages.Strangely, I sort of had this fear that I would put a lot of effort into figuring out how to parse out the language only for someone to come along and point out that it’s a well-known yet academic language that already has a great deal of supporting code and libraries available as open source. Google for “spanish dolphins far side comic” for an illustration of the feeling this would leave me with.
It doesn’t matter in the end. Even if such libraries exist, how easy would they be to integrate into something like ScummVM ? Time to focus on a workable approach to understanding and processing the format.
Problem Scope
So I set about to see if I can write a program to parse the language seen in these INI files. Some questions :- How large is the corpus of data that I need to be sure to support ?
- What parsing approach should I take ?
- What is the exact language format ?
- Other hidden challenges ?
To figure out how large the data corpus is, I counted all of the INI files on all of the discs. There are 138 unique INI files between the 3 discs. However, there are 146 unique INI files after installation. This leads to a hidden challenge described a bit later.
What parsing approach should I take ? I worried a bit too much that I might not be doing this the “right” way. I’m trying to ignore doubts like this, like how “SQL Shame” blocked me on a task for a little while a few years ago as I concerned myself that I might not be using the purest, most elegant approach to the problem. I know I covered language parsing a lot time ago in university computer science education and there is a lot of academic literature to the matter. But sometimes, you just have to charge in and experiment and prototype and see what falls out. In doing so, I expect to have a better understanding of the problems that need to solved and the right questions to ask, not unlike that time that I wrote a continuous integration system from scratch because I didn’t actually know that “continuous integration” was the keyword I needed.
Next, what is the exact language format ? I realized that parsing the language isn’t the first and foremost problem here– I need to know exactly what the language is. I need to know what the grammar are keywords are. In essence, I need to reverse engineer the language before I write a proper parser for it. I guess that fits in nicely with the historical aim of this blog (reverse engineering).
Now, about the hidden challenges– I mentioned that there are 8 more INI files after the game installs itself. Okay, so what’s the big deal ? For some reason, all of the INI files are in plaintext on the CD-ROM but get compressed (apparently, according to file size ratios) when installed to the hard drive. This includes those 8 extra INI files. I thought to look inside the CAB installation archive file on the CD-ROM and the files were there… but all in compressed form. I suspect that one of the files forms the “root” of the program and is the launching point for the game.
Parsing Approach
I took a stab at parsing an INI file. My approach was to first perform lexical analysis on the file and create a list of 4 types : symbols, numbers, strings, and language elements ([]{}()=., :). Apparently, this is the kind of thing that Lex/Flex are good at. This prototyping tool is written in Python, but when I port this to ScummVM, it might be useful to call upon the services of Lex/Flex, or another lexical analyzer, for there are many. I have a feeling it will be easier to use better tools when I understand the full structure of the language based on the data available.
The purpose of this tool is to explore all the possibilities of the existing corpus of INI files. To that end, I ran all 138 of the plaintext files through it, collected all of the symbols, and massaged the results, assuming that the symbols that occurred most frequently are probably core language features. These are all the symbols which occur more than 1000 times among all the scripts :6248 false 5734 looping 4390 scripts 3877 layer 3423 sequentialscript 3408 setactive 3360 file 3257 thescreen 3239 true 3008 autoplay 2914 offset 2599 transparent 2441 text 2361 caption 2276 add 2205 ge 2197 smackanimation 2196 graphicscript 2196 graphic 1977 setstate 1642 state 1611 skippable 1576 desc 1413 delayscript 1298 script 1267 seconds 1019 rect
About That Compression
I have sorted out at least these few details of the compression :bytes 0-3 "COMP" (a pretty strong sign that this is, in fact, compressed data) bytes 4-11 unknown bytes 12-15 size of uncompressed data bytes 16-19 size of compressed data (filesize - 20) bytes 20- compressed payload
The compression ratios are on the same order of gzip. I was hoping that it was stock zlib data. However, I have been unable to prove this. I wrote a Python script that scrubbed through the first 100 bytes of payload data and tried to get Python’s zlib.decompress to initialize– no luck. It’s frustrating to know that I’ll have to reverse engineer a compression algorithm that deals with just 8 total text files if I want to see this effort through to fruition.
Update, January 15, 2019
Some folks expressed interest in trying to sort out the details of the compression format. So I have posted a followup in which I post some samples and go into deeper details about things I have tried :Reverse Engineering Clue Chronicles Compression
The post Parsing The Clue Chronicles first appeared on Breaking Eggs And Making Omelettes.
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FFmpeg android images to movie - error while opening encoder [duplicate]
12 juin 2018, par trinadh thatakulaThis question already has an answer here :
I have been working on android-ffmpeg to convert images into videos and I have found the code I was looking(links below) and I have tried to execute this command
val cmd5 = arrayOf("-analyzeduration", "1M", "-probesize", "1M", "-y", "-framerate", "1/3.79", "-i", Utils.outputPath + "image%d.jpg", "-i", audio!!.path, "-c:v", "libx264", "-tune", "stillimage", "-c:a", "aac", "-strict", "experimental", "-b:a", "192k", "-pix_fmt", "yuv420p", "-shortest", outputLocation.path)and I got error saying
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or heightcan any1 please help me
I have taken code from here -> KotlinFFmpeg and the code snippet is from here -> MovieMaker.kt, please give me a solution, thanks in advance
here are the logs
2018-06-12 18:22:24.000 25364-25664/photo.video.maker D/FFmpeg: Running publishing updates method
2018-06-12 18:22:24.096 25364-25364/photo.video.maker W/System.err: java.io.IOException: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: built with gcc 4.8 (GCC)
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libavutil 55. 17.103 / 55. 17.103
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libavcodec 57. 24.102 / 57. 24.102
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libavformat 57. 25.100 / 57. 25.100
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libavdevice 57. 0.101 / 57. 0.101
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libavfilter 6. 31.100 / 6. 31.100
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libswscale 4. 0.100 / 4. 0.100
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libswresample 2. 0.101 / 2. 0.101
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: libpostproc 54. 0.100 / 54. 0.100
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: [mjpeg @ 0xf193d000] Changing bps to 8
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Input #0, image2, from '/storage/emulated/0/Photo Video Maker/image%d.jpg':
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Duration: 00:02:35.39, start: 0.000000, bitrate: N/A
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1440x1919 [SAR 1:1 DAR 1440:1919], 0.26 tbr, 0.26 tbn, 0.26 tbc
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: [mp3 @ 0xf192d600] Skipping 0 bytes of junk at 61264.
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: [mjpeg @ 0xf193dc00] Changing bps to 8
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Input #1, mp3, from '/data/user/0/photo.video.maker/files/audio2.mp3':
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Metadata:
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: album_artist : Various Artists
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: AccurateRipDiscID: 018-002fb7fe-0279b2d7-47111512-2
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: AccurateRipResult: AccurateRip: Accurate (confidence 10) [0A38F342]
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: title : Morning
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: encoded_by : dBpoweramp Release 14.4
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: publisher : EMI Classics
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: composer : Edvard Grieg
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: TMED : CD (Lossless)
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: genre : Classical
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: compilation : 1
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: album : The Most Relaxing Classical Album in the World...Ever!
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: track : 2/18
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: disc : 1/2
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: artist : Edvard Grieg
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Encoder : Lame 3.99.5
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: UPC : 024356665027
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: date : 1999
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Duration: 00:04:18.04, start: 0.025056, bitrate: 321 kb/s
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Metadata:
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: encoder : LAME3.99r
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Stream #1:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 747x750 [SAR 1:1 DAR 249:250], 90k tbr, 90k tbn, 90k tbc
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Metadata:
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: comment : Cover (front)
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: [swscaler @ 0xf1125000] deprecated pixel format used, make sure you did set range correctly
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: [libx264 @ 0xf193ec00] height not divisible by 2 (1440x1919)
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Output #0, mp4, to '/storage/emulated/0/Photo Video Maker/video/movie_1528807939616.mp4':
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Stream #0:0: Video: h264, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 0.26 fps
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Metadata:
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: encoder : Lavc57.24.102 libx264
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Stream #0:1: Audio: aac, 0 channels, 128 kb/s
2018-06-12 18:22:24.097 25364-25364/photo.video.maker W/System.err: Metadata:
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: encoder : Lavc57.24.102 aac
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: Stream mapping:
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: Stream #1:0 -> #0:1 (mp3 (native) -> aac (native))
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at photo.video.maker.tools.video.MovieMaker$convert$1.onFailure(MovieMaker.kt:78)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.onPostExecute(FFmpegExecuteAsyncTask.java:70)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.onPostExecute(FFmpegExecuteAsyncTask.java:10)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at android.os.AsyncTask.finish(AsyncTask.java:695)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at android.os.AsyncTask.-wrap1(Unknown Source:0)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at android.os.Handler.dispatchMessage(Handler.java:106)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at android.os.Looper.loop(Looper.java:164)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6494)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at java.lang.reflect.Method.invoke(Native Method)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
2018-06-12 18:22:24.098 25364-25364/photo.video.maker W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) -
Injecting Metadata into an .mp4 file
21 août 2019, par TrueCP5I’m working on a library that injects metadata into a .mp4 file to allow the video to be displayed correctly as a 360 video. The input file is a standard .mp4 file in the equirectangular format. I know what metadata needs to be injected I just do not know how to inject it.
I spent some time looking around for libraries that can do this but could only find ones for extracting metadata not injecting/embedding/writing it. The alternative I found was to use Spatial Media as a command line application to inject the metadata more easily. The problem is I know zero python whatsoever so I’m leaning towards a library/nuget package/ffmpeg script.
Does a good nuget package/library exist that can do this or should I go for the alternative option ?
Edit 1
I have tried just pasting in the metadata into the correct place in the file, just in case it might work, but it didn’t.
Edit 2
This is the metadata injected by Google’s Spatial Media Tool which is what I am trying to achieve :
<?xml version="1.0"?>truetrueSpherical Metadata Toolequirectangular`Edit 3
I’ve also tried to do it with ffmpeg like so :
ffmpeg -i input.mp4 -movflags use_metadata_tags -metadata Spherical=true -metadata Stitched=true -metadata ProjectionType=equirectangular -metadata StitchingSoftware=StreetviewJourney -codec copy output.mp4I think the issue with the ffmpeg method is that it does not contain the
rdf:SphericalVideopart which allows the spherical video tags to be used.Edit 4
When I extract the metadata using ffmpeg it contains the spherical tag in the logs but not when I output it to a ffmetadata file. This was the command I used :
ffmpeg -i injected.mp4 -map_metadata -1 -f ffmetadata data.txtThis is the output of the log :
fps, 60 tbr, 15360 tbn, 120 tbc (default)
Metadata:
handler_name : VideoHandler
Side data:
spherical: equirectangular (0.000000/0.000000/0.000000)Edit 5
I also tried to get the metadata using this command :
ffprobe -v error -select_streams v:0 -show_streams -of default=noprint_wrappers=1 injected.mp4This was the logs it outputted :
TAG:handler_name=VideoHandler
side_data_type=Spherical Mapping
projection=equirectangular
yaw=0
pitch=0
roll=0I then tried to use this command but it didn’t work :
ffmpeg -i chapmanspeak.mp4 -movflags use_metadata_tags -metadata side_metadata_type="Spherical Mapping" -metadata projection=equirectangular -metadata yaw=0 -metadata pitch=0 -metadata roll=0 -codec copy output.mp4Edit 6
I tried @VC.One’s method but I must be doing something wrong because the output file is unplayable. Here is my code :
public static void Metadata(string inputFile, string outputFile)
{
byte[] metadata = HexStringToByteArray("3C 3F 78 6D 6C 20 76 65 72 73 69 6F 6E 3D 22 31 2E 30 22 3F 3E 3C 72 64 66 3A 53 70 68 65 72 69 63 61 6C 56 69 64 65 6F 0A 78 6D 6C 6E 73 3A 72 64 66 3D 22 68 74 74 70 3A 2F 2F 77 77 77 2E 77 33 2E 6F 72 67 2F 31 39 39 39 2F 30 32 2F 32 32 2D 72 64 66 2D 73 79 6E 74 61 78 2D 6E 73 23 22 0A 78 6D 6C 6E 73 3A 47 53 70 68 65 72 69 63 61 6C 3D 22 68 74 74 70 3A 2F 2F 6E 73 2E 67 6F 6F 67 6C 65 2E 63 6F 6D 2F 76 69 64 65 6F 73 2F 31 2E 30 2F 73 70 68 65 72 69 63 61 6C 2F 22 3E 3C 47 53 70 68 65 72 69 63 61 6C 3A 53 70 68 65 72 69 63 61 6C 3E 74 72 75 65 3C 2F 47 53 70 68 65 72 69 63 61 6C 3A 53 70 68 65 72 69 63 61 6C 3E 3C 47 53 70 68 65 72 69 63 61 6C 3A 53 74 69 74 63 68 65 64 3E 74 72 75 65 3C 2F 47 53 70 68 65 72 69 63 61 6C 3A 53 74 69 74 63 68 65 64 3E 3C 47 53 70 68 65 72 69 63 61 6C 3A 53 74 69 74 63 68 69 6E 67 53 6F 66 74 77 61 72 65 3E 53 70 68 65 72 69 63 61 6C 20 4D 65 74 61 64 61 74 61 20 54 6F 6F 6C 3C 2F 47 53 70 68 65 72 69 63 61 6C 3A 53 74 69 74 63 68 69 6E 67 53 6F 66 74 77 61 72 65 3E 3C 47 53 70 68 65 72 69 63 61 6C 3A 50 72 6F 6A 65 63 74 69 6F 6E 54 79 70 65 3E 65 71 75 69 72 65 63 74 61 6E 67 75 6C 61 72 3C 2F 47 53 70 68 65 72 69 63 61 6C 3A 50 72 6F 6A 65 63 74 69 6F 6E 54 79 70 65 3E 3C 2F 72 64 66 3A 53 70 68 65 72 69 63 61 6C 56 69 64 65 6F 3E");
byte[] stco = HexStringToByteArray("73 74 63 6F");
byte[] moov = HexStringToByteArray("6D 6F 6F 76");
byte[] trak = HexStringToByteArray("74 72 61 6B");
byte[] file = File.ReadAllBytes(inputFile);
//find trak
int trakPosition = 0;
for (int a = 0; a < file.Length - trak.Length; a++)
{
for (int b = 0; b < trak.Length; b++)
{
if (file[a + b] != trak[b])
break;
if (b == trak.Length - 1)
trakPosition = a;
}
}
if (trakPosition == 0)
throw new FileLoadException();
//add metadata
int trakLength = BitConverter.ToInt32(new ArraySegment<byte>(file, trakPosition - 4, 4).Reverse().ToArray(), 0);
var fileList = file.ToList();
fileList.InsertRange(trakPosition - 4 + trakLength, metadata);
file = fileList.ToArray();
////change length - tried this as well
//byte[] trakBytes = BitConverter.GetBytes(trakLength + metadata.Length).Reverse().ToArray();
//for (int i = 0; i < 4; i++)
// file[trakPosition - 4 + i] = trakBytes[i];
//find moov
int moovPosition = 0;
for (int a = 0; a < file.Length - moov.Length; a++)
{
for (int b = 0; b < moov.Length; b++)
{
if (file[a + b] != moov[b])
break;
if (b == moov.Length - 1)
moovPosition = a;
}
}
if (moovPosition == 0)
throw new FileLoadException();
//change length
int moovLength = BitConverter.ToInt32(new ArraySegment<byte>(file, moovPosition - 4, 4).Reverse().ToArray(), 0);
byte[] moovBytes = BitConverter.GetBytes(moovLength + metadata.Length).Reverse().ToArray();
for (int i = 0; i < 4; i++)
file[moovPosition - 4 + i] = moovBytes[i];
//find stco
int stcoPosition = 0;
for (int a = 0; a < file.Length - stco.Length; a++)
{
for (int b = 0; b < stco.Length; b++)
{
if (file[a + b] != stco[b])
break;
if (b == stco.Length - 1)
stcoPosition = a;
}
}
if (stcoPosition == 0)
throw new FileLoadException();
//modify entries
int stcoEntries = BitConverter.ToInt32(new ArraySegment<byte>(file, stcoPosition + 8, 4).Reverse().ToArray(), 0);
for (int a = stcoPosition + 12; a < stcoPosition + 12 + stcoEntries * 4; a += 4)
{
int entryLength = BitConverter.ToInt32(new ArraySegment<byte>(file, a, 4).Reverse().ToArray(), 0);
byte[] newEntry = BitConverter.GetBytes(entryLength + metadata.Length).Reverse().ToArray();
for (int b = 0; b < 4; b++)
file[a + b] = newEntry[b];
}
File.WriteAllBytes(outputFile, file);
}
private static byte[] HexStringToByteArray(string hex)
{
hex = hex.Replace(" ", "");
return Enumerable.Range(0, hex.Length)
.Where(x => x % 2 == 0)
.Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
.ToArray();
}
</byte></byte></byte></byte>The bytes are reversed because .mp4s seem to be Little Endian. I tried to also update the length of
trakbut that didn’t work either.
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