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  • ffmpeg concatenate two videos, unexpectedly changes the first second(s) of 2nd video

    29 juin 2019, par Roy

    I used ffmpeg to concatenate two videos of my game play recordings. I wrote a list.txt file which lists the two files :

    list.txt:
    
file 2019~06~28_~_Game_1_~_Part_2.mp4
    
file 2019~06~28_~_Game_1_~_Part_3.mp4

    I then run ffmpeg to concat them :

    ffmpeg -safe 0 -f concat -i list.txt -c copy "output.mp4"

    However, the resulting video seems to be skipping frames (or going through them really quickly) at the first second(s) of the second video, causing the perception of the motion suddenly fast-forwarded.

    The two videos were recorded by the same game video recorder "GeForce Experience" in one game session. They should match smoothly when concatenated.

    Here is the output of ffmpeg :

    ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 7.2.0 (GCC)
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001600bbdb5e0] Auto-inserting h264_mp4toannexb bitstream filter
    
Input #0, concat, from 'list.txt':
    
  Duration: N/A, start: 0.000000, bitrate: 24674 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 24479 kb/s, 59.69 fps, 60 tbr, 90k tbn, 120 tbc
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : VideoHandle
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : SoundHandle
    
File 'output.mp4' already exists. Overwrite ? [y/N] y
    
Output #0, mp4, to 'output.mp4':
    
  Metadata:
    
    encoder         : Lavf57.83.100
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 24479 kb/s, 59.69 fps, 60 tbr, 90k tbn, 90k tbc
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : VideoHandle
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s
    
    Metadata:
    
      creation_time   : 2019-06-29T04:43:18.000000Z
    
      handler_name    : SoundHandle
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001600bbdb5e0] Auto-inserting h264_mp4toannexb bitstream filter
    
frame= 7405 fps=0.0 q=-1.0 Lsize=  221175kB time=00:02:03.63 bitrate=14655.4kbits/s speed= 157x
    
video:218137kB audio:2862kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.079741%

    In particular, I don’t know what does "Auto-inserting h254_mp4toannexb bitstream filter" mean. Did this caused the unexpected change ?

  • FFmpeg C++ decoding in a separate thread

    12 juin 2019, par Brigapes

    I’m trying to decode a video with FFmpeg and convert it to an openGL texture and display it inside a cocos2dx engine. I’ve managed to do that and it displays the video as i wanted to, now the problem is performance wise. I get a Sprite update every frame(game is fixed 60fps, video is 30fps) so what i did was i decoded and converted frame interchangeably, didn’t work great, now i have it set up to have a separate thread where i decode in an infinite while loop with sleep() just so it doesn’t hog the cpu/program.
    What i currently have set up is 2 pbo framebuffers and a bool flag to tell my ffmpeg thread loop to decode another frame since i don’t know how to manually wait when to decode another frame. I’ve searched online for a soultion to this kind of problem but didn’t manage to get any answers.

    I’ve looked at this : Decoding video directly into a texture in separate thread but it didn’t solve my problem since it was just converting YUV to RGB inside opengl shaders which i haven’t done yet but currently not an issue.

    Additional info that might be useful is that i don’t need to end thread until application exit and i’m open to using any video format, including lossless.

    Ok so main decoding loop looks like this :

    //.. this is inside of a constructor / init
    
//adding thread to array in order to save the thread    
    
global::global_pending_futures.push_back(std::async(std::launch::async, [=] {
    
        while (true) {
    
            if (isPlaying) {
    
                this->decodeLoop();
    
            }
    
            else {
    
                std::this_thread::sleep_for(std::chrono::milliseconds(3));
    
            }
    
        }
    
    }));

    Reason why i use bool to check if frame was used is because main decoding function takes about 5ms to finish in debug and then should wait about 11 ms for it to display the frame, so i can’t know when the frame was displayed and i also don’t know how long did decoding take.

    Decode function :

    void video::decodeLoop() { //this should loop in a separate thread
    
    frameData* buff = nullptr;
    
    if (buf1.needsRefill) {
    
    /// buf1.bufferLock.lock();
    
        buff = &buf1;
    
        buf1.needsRefill = false;
    
        firstBuff = true;
    
    }
    
    else if (buf2.needsRefill) {
    
        ///buf2.bufferLock.lock();
    
        buff = &buf2;
    
        buf2.needsRefill = false;
    
        firstBuff = false;
    
    }
    

    
    if (buff == nullptr) {
    
        std::this_thread::sleep_for(std::chrono::milliseconds(1));
    
        return;//error? //wait?
    
    }
    

    
    //pack pixel buffer?
    

    
    if (getNextFrame(buff)) {
    
        getCurrentRBGConvertedFrame(buff);
    
    }
    
    else {
    
        loopedTimes++;
    
        if (loopedTimes >= repeatTimes) {
    
            stop();
    
        }
    
        else {
    
            restartVideoPlay(&buf1);//restart both
    
            restartVideoPlay(&buf2);
    
            if (getNextFrame(buff)) {
    
                getCurrentRBGConvertedFrame(buff);
    
            }
    
        }
    
    }
    
/// buff->bufferLock.unlock();
    

    
    return;
    
}

    As you can tell i first check if buffer was used using bool needsRefill and then decode another frame.

    frameData struct :

        struct frameData {
    
        frameData() {};
    
        ~frameData() {};
    

    
        AVFrame* frame;
    
        AVPacket* pkt;
    
        unsigned char* pdata;
    
        bool needsRefill = true;
    
        std::string name = "";
    

    
        std::mutex bufferLock;
    

    
        ///unsigned int crrFrame
    
        GLuint pboid = 0;
    
    };

    And this is called every frame :

    void video::actualDraw() { //meant for cocos implementation
    
    if (this->isVisible()) {
    
        if (this->getOpacity() > 0) {
    
            if (isPlaying) {
    
                if (loopedTimes >= repeatTimes) { //ignore -1 because comparing unsgined to signed
    
                    this->stop();
    
                }
    
            }
    

    
            if (isPlaying) {
    
                this->setVisible(true);
    

    
                if (!display) { //skip frame
    
                    ///this->getNextFrame();
    
                    display = true;
    
                }
    
                else if (display) {
    
                    display = false;
    
                    auto buff = this->getData();                    
    
                    width = this->getWidth();
    
                    height = this->getHeight();
    
                    if (buff) {
    
                        if (buff->pdata) {
    

    
                            glBindBuffer(GL_PIXEL_UNPACK_BUFFER, buff->pboid);
    
                            glBufferData(GL_PIXEL_UNPACK_BUFFER, 3 * (width*height), buff->pdata, GL_DYNAMIC_DRAW);
    

    

    
                            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, 0);///buff->pdata);                            glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
    
                        }
    

    
                        buff->needsRefill = true;
    
                    }
    
                }
    
            }
    
            else { this->setVisible(false); }
    
        }
    
    }
    
}

    getData func to tell which frambuffer it uses

    video::frameData* video::getData() {
    
    if (firstBuff) {
    
        if (buf1.needsRefill == false) {
    
            ///firstBuff = false;
    
            return &buf1;///.pdata;
    
        }
    
    }
    
    else { //if false
    
        if (buf2.needsRefill == false) {
    
            ///firstBuff = true;
    
            return &buf2;///.pdata;
    
        }
    
    }
    
    return nullptr;
    
}

    I’m not sure what else to include i pasted whole code to pastebin.
    video.cpp : https://pastebin.com/cWGT6APn
    video.h https://pastebin.com/DswAXwXV

    To summarize the problem :

    How do i properly implement decoding in a separate thread / how do i optimize current code ?

    Currently video is lagging when some other thread or main thread gets heavy and then it does not decode fast enough.

  • Kernel32 not found when using FFmpeg.Autogen 4.1.0.2 in Mono/Linux

    5 décembre 2024, par Robert Russell

    I'm submitting a bug report while I was posting this I didn't know I could see into FFmpeg.Autogen from the stacktrace. Anyways I posted a Bug Report on Github

    



    https://github.com/Ruslan-B/FFmpeg.AutoGen/issues/109

    



    I'm trying to run my code in Linux that uses FFmpeg.Autogen to interface with the ffmpeg libraries. I am getting kernel32 dll not found can not figure out why. He says to not post issues to github for troubleshooting.
Possible related issue : https://github.com/Ruslan-B/FFmpeg.AutoGen/issues/89

    



    First thing I've tried were to include the binary helper class from the example code I tweaked it a little bit. Added the exact path to the linux files.
Second thing I did was add FFmpeg.AutoGen.dll.config if configured right and it tries to ref a windows DLL it should point to the linux one.
Stacktrace :

    



    System.DllNotFoundException: kernel32
  at at (wrapper managed-to-native) FFmpeg.AutoGen.Native.WindowsNativeMethods.GetProcAddress(intptr,string)
  at FFmpeg.AutoGen.Native.FunctionLoader.GetFunctionPointer (System.IntPtr nativeLibraryHandle, System.String functionName) [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\Native\FunctionLoader.cs:55
  at FFmpeg.AutoGen.Native.FunctionLoader.GetFunctionDelegate[T] (System.IntPtr nativeLibraryHandle, System.String functionName, System.Boolean throwOnError) [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\Native\FunctionLoader.cs:28
  at FFmpeg.AutoGen.ffmpeg.GetFunctionDelegate[T] (System.IntPtr libraryHandle, System.String functionName) [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\FFmpeg.cs:50
  at FFmpeg.AutoGen.ffmpeg+<>c.<.cctor>b__4_318 () [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\FFmpeg.functions.export.g.cs:7163
  at FFmpeg.AutoGen.ffmpeg.avformat_alloc_context () [0x00000] in D:\FFmpeg.AutoGen\FFmpeg.AutoGen\FFmpeg.functions.export.g.cs:7176
  at FF8.FfccVaribleGroup..ctor () [0x0009c] in /home/robert/OpenVIII/FF8/FfccVaribleGroup.cs:53
  at FF8.Ffcc..ctor (System.String filename, FFmpeg.AutoGen.AVMediaType mediatype, FF8.Ffcc+FfccMode mode) [0x00008] in /home/robert/OpenVIII/FF8/Ffcc.cs:31
  at FF8.Module_movie_test.InitMovie () [0x00001] in /home/robert/OpenVIII/FF8/module_movie_test.cs:160
  at FF8.Module_movie_test.Update () [0x000c5] in /home/robert/OpenVIII/FF8/module_movie_test.cs:88
  at FF8.ModuleHandler.Update (Microsoft.Xna.Framework.GameTime gameTime) [0x000ac] in /home/robert/OpenVIII/FF8/ModuleHandler.cs:43
  at FF8.Game1.Update (Microsoft.Xna.Framework.GameTime gameTime) [0x00030] in /home/robert/OpenVIII/FF8/Game1.cs:69
  at Microsoft.Xna.Framework.Game.DoUpdate (Microsoft.Xna.Framework.GameTime gameTime) [0x00019] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.Game.Tick () [0x00103] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.SdlGamePlatform.RunLoop () [0x00021] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.Game.Run (Microsoft.Xna.Framework.GameRunBehavior runBehavior) [0x0008b] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at Microsoft.Xna.Framework.Game.Run () [0x0000c] in <4fc8466c27384bb19c7b81b2a6a71083>:0
  at FF8.Program.Main () [0x00007] in /home/robert/OpenVIII/FF8/Program.cs:17


    



    My code that triggers this :

    



    Format = ffmpeg.avformat_alloc_context();


    



    Binaryhelper should set the path correctly for the file

    



    internal static void RegisterFFmpegBinaries()
        {
            var libraryPath = "";
            switch (Environment.OSVersion.Platform)
            {
                case PlatformID.Win32NT:
                case PlatformID.Win32S:
                case PlatformID.Win32Windows:
                    var current = Environment.CurrentDirectory;
                    var probe = Path.Combine(Environment.Is64BitProcess ? "x64" : "x86");
                    while (current != null)
                    {
                        var ffmpegDirectory = Path.Combine(current, probe);
                        if (Directory.Exists(ffmpegDirectory))
                        {
                            Console.WriteLine($"FFmpeg binaries found in: {ffmpegDirectory}");
                            RegisterLibrariesSearchPath(ffmpegDirectory);
                            return;
                        }
                        current = Directory.GetParent(current)?.FullName;
                    }
                    break;
                case PlatformID.Unix:
                    libraryPath = "/usr/lib/x86_64-linux-gnu";
                    RegisterLibrariesSearchPath(libraryPath);
                    break;
                case PlatformID.MacOSX:
                    libraryPath = Environment.GetEnvironmentVariable(LD_LIBRARY_PATH);
                    RegisterLibrariesSearchPath(libraryPath);
                    break;
            }
        }


    



    The FFmpeg.Autogen.dll.config

    



    <configuration>&#xA;  <dllmap os="linux" dll="avutil-56.dll" target="/usr/lib/x86_64-linux-gnu/libavutil.so.56"></dllmap>&#xA;  <dllmap os="linux" dll="avcodec-58.dll" target="/usr/lib/x86_64-linux-gnu/libavcodec.so.58"></dllmap>&#xA;  <dllmap os="linux" dll="avformat-58.dll" target="/usr/lib/x86_64-linux-gnu/libavformat.so.58"></dllmap>&#xA;  <dllmap os="linux" dll="avdevice-58.dll" target="/usr/lib/x86_64-linux-gnu/libavdevice.so.58"></dllmap>&#xA;  <dllmap os="linux" dll="avfilter-7.dll" target="/usr/lib/x86_64-linux-gnu/libavfilter.so.7"></dllmap>&#xA;  <dllmap os="linux" dll="avresample-4.dll" target="/usr/lib/x86_64-linux-gnu/libavresample.so.4"></dllmap>&#xA;  <dllmap os="linux" dll="swscale-5.dll" target="/usr/lib/x86_64-linux-gnu/libswscale.so.5"></dllmap>&#xA;  <dllmap os="linux" dll="swresample-3.dll" target="/usr/lib/x86_64-linux-gnu/libswresample.so.3"></dllmap>&#xA;  <dllmap os="linux" dll="postproc-55.dll" target="/usr/lib/x86_64-linux-gnu/libpostproc.so.55"></dllmap>&#xA;</configuration>&#xA;

    &#xA;

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