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  • How do terminal pipes in Python differ from those in Rust ?

    5 octobre 2022, par rust_convert

    To work on learning Rust (in a Tauri project) I am converting a Python 2 program that uses ffmpeg to create a custom video format from a GUI. The video portion converts successfully, but I am unable to get the audio to work. With the debugging I have done for the past few days, it looks like I am not able to read in the audio data in Rust correctly from the terminal pipe - what is working to read in the video data is not working for the audio. I have tried reading in the audio data as a string and then converting it to bytes but then the byte array appears empty. I have been researching the 'Pipe'-ing of data from the rust documentation and python documentation and am unsure how the Rust pipe could be empty or incorrect if it's working for the video.

    


    From this python article and this rust stack overflow exchange, it looks like the python stdout pipe is equivalent to the rust stdin pipe ?

    


    The python code snippet for video and audio conversion :

    


    output=open(self.outputFile, 'wb')
devnull = open(os.devnull, 'wb')

vidcommand = [ FFMPEG_BIN,
            '-i', self.inputFile,
            '-f', 'image2pipe',
            '-r', '%d' % (self.outputFrameRate),
            '-vf', scaleCommand,
            '-vcodec', 'rawvideo',
            '-pix_fmt', 'bgr565be',
            '-f', 'rawvideo', '-']
        
vidPipe = '';
if os.name=='nt' :
    startupinfo = sp.STARTUPINFO()
    startupinfo.dwFlags |= sp.STARTF_USESHOWWINDOW
    vidPipe=sp.Popen(vidcommand, stdin = sp.PIPE, stdout = sp.PIPE, stderr = devnull, bufsize=self.inputVidFrameBytes*10, startupinfo=startupinfo)
else:
    vidPipe=sp.Popen(vidcommand, stdin = sp.PIPE, stdout = sp.PIPE, stderr = devnull, bufsize=self.inputVidFrameBytes*10)

vidFrame = vidPipe.stdout.read(self.inputVidFrameBytes)

audioCommand = [ FFMPEG_BIN,
    '-i', self.inputFile,
    '-f', 's16le',
    '-acodec', 'pcm_s16le',
    '-ar', '%d' % (self.outputAudioSampleRate),
    '-ac', '1',
    '-']

audioPipe=''
if (self.audioEnable.get() == 1):
    if os.name=='nt' :
        startupinfo = sp.STARTUPINFO()
        startupinfo.dwFlags |= sp.STARTF_USESHOWWINDOW
        audioPipe = sp.Popen(audioCommand, stdin = sp.PIPE, stdout=sp.PIPE, stderr = devnull, bufsize=self.audioFrameBytes*10, startupinfo=startupinfo)
    else:
        audioPipe = sp.Popen(audioCommand, stdin = sp.PIPE, stdout=sp.PIPE, stderr = devnull, bufsize=self.audioFrameBytes*10)

    audioFrame = audioPipe.stdout.read(self.audioFrameBytes) 

currentFrame=0;

while len(vidFrame)==self.inputVidFrameBytes:
    currentFrame+=1
    if(currentFrame%30==0):
        self.progressBarVar.set(100.0*(currentFrame*1.0)/self.totalFrames)
    if (self.videoBitDepth.get() == 16):
        output.write(vidFrame)
    else:
        b16VidFrame=bytearray(vidFrame)
        b8VidFrame=[]
        for p in range(self.outputVidFrameBytes):
            b8VidFrame.append(((b16VidFrame[(p*2)+0]>>0)&0xE0)|((b16VidFrame[(p*2)+0]<<2)&0x1C)|((b16VidFrame[(p*2)+1]>>3)&0x03))
        output.write(bytearray(b8VidFrame))

    vidFrame = vidPipe.stdout.read(self.inputVidFrameBytes) # Read where vidframe is to match up with audio frame and output?
    if (self.audioEnable.get() == 1):


        if len(audioFrame)==self.audioFrameBytes:
            audioData=bytearray(audioFrame) 

            for j in range(int(round(self.audioFrameBytes/2))):
                sample = ((audioData[(j*2)+1]<<8) | audioData[j*2]) + 0x8000
                sample = (sample>>(16-self.outputAudioSampleBitDepth)) & (0x0000FFFF>>(16-self.outputAudioSampleBitDepth))

                audioData[j*2] = sample & 0xFF
                audioData[(j*2)+1] = sample>>8

            output.write(audioData)
            audioFrame = audioPipe.stdout.read(self.audioFrameBytes)

        else:
            emptySamples=[]
            for samples in range(int(round(self.audioFrameBytes/2))):
                emptySamples.append(0x00)
                emptySamples.append(0x00)
            output.write(bytearray(emptySamples))

self.progressBarVar.set(100.0)

vidPipe.terminate()
vidPipe.stdout.close()
vidPipe.wait()

if (self.audioEnable.get() == 1):
    audioPipe.terminate()
    audioPipe.stdout.close()
    audioPipe.wait()

output.close()


    


    The Rust snippet that should accomplish the same goals :

    


    let output_file = OpenOptions::new()
    .create(true)
    .truncate(true)
    .write(true)
    .open(&output_path)
    .unwrap();
let mut writer = BufWriter::with_capacity(
    options.video_frame_bytes.max(options.audio_frame_bytes),
    output_file,
);
let ffmpeg_path = sidecar_path("ffmpeg");
#[cfg(debug_assertions)]
let timer = Instant::now();

let mut video_cmd = Command::new(&ffmpeg_path);
#[rustfmt::skip]
video_cmd.args([
    "-i", options.path,
    "-f", "image2pipe",
    "-r", options.frame_rate,
    "-vf", options.scale,
    "-vcodec", "rawvideo",
    "-pix_fmt", "bgr565be",
    "-f", "rawvideo",
    "-",
])
.stdin(Stdio::null())
.stdout(Stdio::piped())
.stderr(Stdio::null());

// windows creation flag CREATE_NO_WINDOW: stops the process from creating a CMD window
// https://docs.microsoft.com/en-us/windows/win32/procthread/process-creation-flags
#[cfg(windows)]
video_cmd.creation_flags(0x08000000);

let mut video_child = video_cmd.spawn().unwrap();
let mut video_stdout = video_child.stdout.take().unwrap();
let mut video_frame = vec![0; options.video_frame_bytes];

let mut audio_cmd = Command::new(&ffmpeg_path);
#[rustfmt::skip]
audio_cmd.args([
    "-i", options.path,
    "-f", "s16le",
    "-acodec", "pcm_s16le",
    "-ar", options.sample_rate,
    "-ac", "1",
    "-",
])
.stdin(Stdio::null())
.stdout(Stdio::piped())
.stderr(Stdio::null());

#[cfg(windows)]
audio_cmd.creation_flags(0x08000000);

let mut audio_child = audio_cmd.spawn().unwrap();
let mut audio_stdout = audio_child.stdout.take().unwrap();
let mut audio_frame = vec![0; options.audio_frame_bytes];

while video_stdout.read_exact(&mut video_frame).is_ok() {
    writer.write_all(&video_frame).unwrap();

    if audio_stdout.read_to_end(&mut audio_frame).is_ok() {
        if audio_frame.len() == options.audio_frame_bytes {
            for i in 0..options.audio_frame_bytes / 2 {
                let temp_sample = ((u32::from(audio_frame[(i * 2) + 1]) << 8)
                    | u32::from(audio_frame[i * 2]))
                    + 0x8000;
                let sample = (temp_sample >> (16 - 10)) & (0x0000FFFF >> (16 - 10));

                audio_frame[i * 2] = (sample & 0xFF) as u8;
                audio_frame[(i * 2) + 1] = (sample >> 8) as u8;
            }
        } else {
            audio_frame.fill(0x00);
        }
    }
    writer.write_all(&audio_frame).unwrap();
}


video_child.wait().unwrap();
audio_child.wait().unwrap();

#[cfg(debug_assertions)]
{
    let elapsed = timer.elapsed();
    dbg!(elapsed);
}

writer.flush().unwrap();


    


    I have looked at the hex data of the files using HxD - regardless of how I alter the Rust program, I am unable to get data different from what is previewed in the attached image - so the audio pipe is incorrectly interfaced. I included a screenshot of the hex data from the working python program that converts the video and audio correctly.

    


    HxD Python program hex output :

    


    HxD Python program hex output

    


    HxD Rust program hex output :

    


    HxD Rust program hex output

    


  • How to download SAMPLE-AES-CTR encrypted stream

    28 décembre 2022, par Mqx

    Hey is there a way for me to use ffmpeg to download the SAMPLE-AES-CTR encrypted stream ?

    


    When I open the mp4 file the audio works fine but the video is broken.
video.mp4

    


    This is the m3u8 file :

    


    #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:9
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PROGRAM-DATE-TIME:2019-01-01T00:00:00.000Z
#EXT-X-DATERANGE:ID="pod_0",START-DATE="2019-01-01T00:00:00.000Z",DURATION=1294.7935,X-START-OFFSET="0.0"
#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,KEYFORMAT="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed",KEYFORMATVERSIONS="1",URI="data:text/plain;base64,AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISENR18PVtrUn8kOFwjHCeoCI="
#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,KEYFORMAT="com.microsoft.playready",KEYFORMATVERSIONS="1",URI="data:text/plain;charset=UTF-16;base64,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"
#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,KEYFORMAT="PRMNAGRA",KEYFORMATVERSIONS="1",URI="data:text/plain;base64,eyJrZXktaWQiOiJkNDc1ZjBmNS02ZGFkLTQ5ZmMtOTBlMS03MDhjNzA5ZWEwMjIiLCJlbWkiOiJjdHIiLCJwcm0iOiJleUpqYjI1MFpXNTBTV1FpT2lKamRISWlMQ0pyWlhsSlpDSTZJbVEwTnpWbU1HWTFMVFprWVdRdE5EbG1ZeTA1TUdVeExUY3dPR00zTURsbFlUQXlNaUo5In0="
#EXT-X-MAP:URI="241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/map.mp4"
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/00_000.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/08_008.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/16_016.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/24_024.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/32_032.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/40_040.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/48_048.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/00/56_056.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/01/04_064.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/01/12_072.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/01/20_080.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/01/28_088.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/01/36_096.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/01/44_104.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/01/52_112.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/00_120.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/08_128.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/16_136.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/24_144.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/32_152.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/40_160.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/48_168.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/02/56_176.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/03/04_184.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/03/12_192.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/03/20_200.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/03/28_208.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/03/36_216.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/03/44_224.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/03/52_232.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/00_240.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/08_248.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/16_256.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/24_264.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/32_272.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/40_280.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/48_288.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/04/56_296.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/05/04_304.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/05/12_312.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/05/20_320.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/05/28_328.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/05/36_336.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/05/44_344.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/05/52_352.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/00_360.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/08_368.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/16_376.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/24_384.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/32_392.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/40_400.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/48_408.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/06/56_416.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/07/04_424.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/07/12_432.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/07/20_440.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/07/28_448.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/07/36_456.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/07/44_464.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/07/52_472.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/08/00_480.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/08/08_488.mp4
#EXTINF:8.008,
241b53fa-e44e-458a-910a-5afca4f57e13/90e4-MAIN/02/4250K/00/08/16_496.mp4
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    If there is any other information I can give to solve the problem please let me know.

    


    I have tried the following lines, but none of them worked :

    


    ffmpeg -i "URL" -c copy output.mp4
ffmpeg -i "URL" -c copy -bsf:a aac_adtstoasc output.mp4


    


  • Reverse Engineering Clue Chronicles Compression

    15 janvier 2019, par Multimedia Mike — Game Hacking

    My last post described my exploration into the 1999 computer game Clue Chronicles : Fatal Illusion. Some readers expressed interest in the details so I thought I would post a bit more about how I have investigated and what I have learned.

    It’s frustrating to need to reverse engineer a compression algorithm that is only applied to a total of 8 files (out of a total set of 140), but here we are. Still, I’m glad some others expressed interest in this challenge as it motivated me to author this post, which in turn prompted me to test and challenge some of my assumptions.

    Spoiler : Commenter ‘m’ gave me the clue I needed : PKWare Data Compression Library used the implode algorithm rather than deflate. I was able to run this .ini data through an open source explode algorithm found in libmpq and got the correct data out.

    Files To Study
    I uploaded a selection of files for others to study, should they feel so inclined. These include the main game binary (if anyone has ideas about how to isolate the decompression algorithm from the deadlisting) ; compressed and uncompressed examples from 2 files (newspaper.ini and Drink.ini) ; and the compressed version of Clue.ini, which I suspect is the root of the game’s script.

    The Story So Far
    This ad-hoc scripting language found in the Clue Chronicles game is driven by a series of .ini files that are available in both compressed and uncompressed forms, save for a handful of them which only come in compressed flavor. I have figured out a few obvious details of the compressed file format :

    bytes 0-3 "COMP"
bytes 4-11 unknown
bytes 12-15 size of uncompressed data
bytes 16-19 size of compressed data (filesize - 20 bytes)
bytes 20- compressed payload

    The average compression ratio is on the same order as what could be achieved by running ‘gzip’ against the uncompressed files and using one of the lower number settings (i.e., favor speed vs. compression size, e.g., ‘gzip -2’ or ‘gzip -3’). Since the zlib/DEFLATE algorithm is quite widespread on every known computing platform, I thought that this would be a good candidate to test.

    Exploration
    My thinking was that I could load the bytes in the compressed ini file and feed it into Python’s zlib library, sliding through the first 100 bytes to see if any of them “catch” on the zlib decompression algorithm.

    Here is the exploration script :

    <script src="https://gist.github.com/multimediamike/c95f1a9cc58b959f4d8b2a299927d35e.js"></script>

    It didn’t work, i.e., the script did not find any valid zlib data. A commentor on my last post suggested trying bzip2, so I tried the same script but with the bzip2 decompressor library. Still no luck.

    Wrong Approach
    I realized I had not tested to make sure that this exploratory script would work on known zlib data. So I ran it on a .gz file and it failed to find zlib data. So it looks like my assumptions were wrong. Meanwhile, I can instruct Python to compress data with zlib and dump the data to a file, and then run the script against that raw zlib output and the script recognizes the data.

    I spent some time examining how zlib and gzip interact at the format level. It looks like the zlib data doesn’t actually begin on byte boundaries within a gzip container. So this approach was doomed to failure.

    A Closer Look At The Executable
    Installation of Clue Chronicles results in a main Windows executable named Fatal_Illusion.exe. It occurred to me to examine this again, specifically for references to something like zlib.dll. Nothing like that. However, a search for ‘compr’ shows various error messages which imply that there is PNG-related code inside (referencing IHDR and zTXt data types), even though PNG files are not present in the game’s asset mix.

    But there are also strings like “PKWARE Data Compression Library for Win32”. So I have started going down the rabbit hole of determining whether the compression is part of a ZIP format file. After all, a ZIP local file header data structure has 4-byte compressed and uncompressed sizes, as seen in this format.

    Binary Reverse Engineering
    At one point, I took the approach of attempting to reverse engineer the binary. When studying a deadlisting of the code, it’s easy to search for the string “COMP” and find some code that cares about these compressed files. Unfortunately, the code quickly follows an indirect jump instruction which makes it intractable to track the algorithm from a simple deadlisting.

    I also tried installing some old Microsoft dev tools on my old Windows XP box and setting some breakpoints while the game was running and do some old-fashioned step debugging. That was a total non-starter. According to my notes :

    Address 0x004A3C32 is the setup to the strncmp(“COMP”, ini_data, 4) function call. Start there.

    Problem : The game forces 640x480x256 mode and that makes debugging very difficult.

    Just For One Game ?
    I keep wondering if this engine was used for any other games. Clue Chronicles was created by EAI Interactive. As I review the list of games they are known to have created (ranging between 1997 and 2000), a few of them jump out at me as possibly being able to leverage the same engine. I have a few of them, so I checked those… nothing. Then I scrubbed some YouTube videos showing gameplay of other suspects. None of those strike me as having similar engine characteristics to Clue Chronicles. So this remains a mystery : did they really craft this engine with its own scripting language just for one game ?

    The post Reverse Engineering Clue Chronicles Compression first appeared on Breaking Eggs And Making Omelettes.

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