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• AWS Lambda function, API gateway and ffmpeg timeout issue

  3 novembre 2022, par Georgi Stoyanov

  I have created a lambda function, that is extracting the audio stream from a video file using ffmpeg. I have also configured API gateway as a trigger, where I am passing the file to the lambda function in the request body.

  


  The lambda function is working perfectly well with small files, but with bigger files, it needs a bit more time and then I am running into the API gateway timeout, which according to my understanding is set to 29 seconds max.

  


  So when I trigger audio extraction from a bigger file, I am hitting this timeout and my API request fails to return any result even though the transcoding still runs in the background and the file is extracted, so I was wondering what is the best approach to handle those cases, where the execution of the lambda function is taking longer ?

  


  I was thinking to start the transcoding in the background and simply return a JSON with a message that the transcoding might take a couple of minutes, depending on the input file duration, but if I try to push the ffmpeg to the background I am being presented with an error, that the destination file doesn't exist.

  


  os.system(f"{ffmpeg} -loglevel panic -nostdin -i {in_video} -vn -c:a aac -ar 48000 -b:a 192K {out_audio} 2> /dev/null &")


  


  This is the ffmpeg command extracting the audio and transcoding it to AAC.

  


  If I remove the 2> /dev/null & part of the command, it runs just fine, but if I keep it, I get an error :

  


  


  "errorMessage" : "[Errno 2] No such file or directory : 'output_audio.aac'"

  


  


  


  "errorType" : "FileNotFoundError"

  


  


  So I was wondering what is the preferred way to run processes in the background.

  


• Why storage access functions not working on android 10 API-29 ? error=13, Permission denied ?

  8 janvier 2021, par Rpatel

  


  This example code is to create video from images and music.
Code running on till API level 28 but when I just upgrade to
Build version 29 then it starts crashing. I tried the most solution
but could not find the proper reason and solution.
  
Please let me know...

  


  


  2

  


  021-01-08 19:48:16.045 18413-19578/com.example.photovideomaker E/audio: io&#xA;    java.io.IOException: Cannot run program "/data/user/0/com.example.photovideomaker/files/ffmpeg": error=13, Permission denied&#xA;        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1050)&#xA;        at java.lang.Runtime.exec(Runtime.java:698)&#xA;        at java.lang.Runtime.exec(Runtime.java:563)&#xA;        at com.example.photovideomaker.service.CreateVideoService.joinAudio(CreateVideoService.java:252)&#xA;        at com.example.photovideomaker.service.CreateVideoService.createVideo(CreateVideoService.java:89)&#xA;        at com.example.photovideomaker.service.CreateVideoService.onHandleIntent(CreateVideoService.java:83)&#xA;        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:78)&#xA;        at android.os.Handler.dispatchMessage(Handler.java:107)&#xA;        at android.os.Looper.loop(Looper.java:214)&#xA;        at android.os.HandlerThread.run(HandlerThread.java:67)&#xA;     Caused by: java.io.IOException: error=13, Permission denied&#xA;        at java.lang.UNIXProcess.forkAndExec(Native Method)&#xA;        at java.lang.UNIXProcess.<init>(UNIXProcess.java:133)&#xA;        at java.lang.ProcessImpl.start(ProcessImpl.java:141)&#xA;        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)&#xA;        at java.lang.Runtime.exec(Runtime.java:698)&#xA0;&#xA;        at java.lang.Runtime.exec(Runtime.java:563)&#xA0;&#xA;        at com.example.photovideomaker.service.CreateVideoService.joinAudio(CreateVideoService.java:252)&#xA0;&#xA;        at com.example.photovideomaker.service.CreateVideoService.createVideo(CreateVideoService.java:89)&#xA0;&#xA;        at com.example.photovideomaker.service.CreateVideoService.onHandleIntent(CreateVideoService.java:83)&#xA0;&#xA;        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:78)&#xA0;&#xA;        at android.os.Handler.dispatchMessage(Handler.java:107)&#xA0;&#xA;        at android.os.Looper.loop(Looper.java:214)&#xA0;&#xA;        at android.os.HandlerThread.run(HandlerThread.java:67)&#xA0;&#xA;</init>

  


  


  This function throwing the error "On Process.runtime"

  


  


  private void createVideo() {
        long startTime = System.currentTimeMillis();
        toatalSecond = (application.getSecond() * ((float) application.getSelectedImages().size())) - DEFAULT_FONT_SCALE;
        joinAudio();
        while (true) {
            if (ImageCreatorService.isImageComplate) {
                Log.e("image creation ", " complte");

                break;
            }else {
                Log.e("image creation ", "not complte");
            }
        }
        Log.e("createVideo", "video create start");
        new File(FileUtils.TEMP_DIRECTORY, "video.txt").delete();
        for (int i = 0; i < application.videoImages.size(); i++) {
            appendVideoLog(String.format("file '%s'", application.videoImages.get(i)));
        }

        File r0=new File(FileUtils.TEMP_DIRECTORY, "video.txt");
        String videoPath = new File(FileUtils.APP_DIRECTORY, getVideoName()).getAbsolutePath();
        String[] inputCode = application.getMusicData() != null ? new String[]{
                FileUtils.getFFmpeg(this), "-r",
                String.valueOf(BitmapDescriptorFactory.HUE_ORANGE / application.getSecond()),
                "-f", "concat", "-safe", "0", "-i", r0.getAbsolutePath(), "-i",
                audioFile.getAbsolutePath(), "-strict", "experimental", "-r", "30",
                "-t", String.valueOf(toatalSecond), "-c:v", "libx264", "-preset",
                "ultrafast", "-pix_fmt", "yuv420p", "-ac", "2", videoPath}
        : new String[]{FileUtils.getFFmpeg(this),
                "-r", String.valueOf(BitmapDescriptorFactory.HUE_ORANGE / application.getSecond()),
                "-f", "concat", "-i", r0.getAbsolutePath(), "-r", "30", "-c:v", "libx264", "-preset", "ultrafast", "-pix_fmt", "yuv420p", videoPath};

        System.gc();
        Process process = null;
        try {
            process = Runtime.getRuntime().exec(inputCode);
            while (!Util.isProcessCompleted(process)) {
                BufferedReader reader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
                while (true) {
                    String line = reader.readLine();
                    if (line != null) {
                        Log.e("process", line);
                        appendLog(line);
                        final int incr = durationToprogtess(line);
                        new Handler(Looper.getMainLooper()).post(new Runnable() {
                            public void run() {
                                if (receiver != null) {
                                    receiver.onVideoProgressUpdate(incr);
                                }
                            }
                        });
                        mBuilder.setProgress(100, ((int) ((75.0f * ((float) incr)) / 100.0f)) + 25, false);
                        mNotifyManager.notify(1001, mBuilder.build());
                    }else {
                        break;
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            Util.destroyProcess(process);
        }
        mBuilder.setContentText("Video created :" + FileUtils.getDuration(System.currentTimeMillis() - startTime)).setProgress(0, 0, false);
        mNotifyManager.notify(1001, mBuilder.build());
        try {
            long fileSize = new File(videoPath).length();
            String artist = getResources().getString(R.string.artist_name);
            ContentValues values = new ContentValues();
            values.put("_data", videoPath);
            values.put("_size", Long.valueOf(fileSize));
            values.put("mime_type", "video/mp4");
            values.put("artist", artist);
            values.put("duration", Float.valueOf(toatalSecond * 1000.0f));
            getContentResolver().insert(Media.getContentUriForPath(videoPath), values);
        } catch (Exception e2) {
            e2.printStackTrace();
        }
        try {
            sendBroadcast(new Intent("android.intent.action.MEDIA_SCANNER_SCAN_FILE", Uri.fromFile(new File(videoPath))));
        } catch (Exception e3) {
            e3.printStackTrace();
        }

        buildNotification(videoPath);
        final String str = videoPath;
        new Handler(Looper.getMainLooper()).post(new Runnable() {
            public void run() {
                if (receiver != null) {
                    receiver.onVideoProgressUpdate(100);
                    receiver.onProgressFinish(str);
                }
            }
        });
        FileUtils.deleteTempDir();
       stopSelf();
    }


  


  I have tried checking the directory in storage and check mkdir is working or not but this function purely works for creating video from a collection of images, themes, and audio. as per android

  


• ffmpeg can't access to usb webcam from python subprocess.Popen in windows

  29 avril 2021, par Tomez

  If I run the following ffmpeg command from windows cmd it works
  

  


  ffmpeg -f dshow -i video="USB Video Device" -s 1280x720 -f rawvideo -pix_fmt rgb24 pipe:


  


  I then tried to execute the same in python
  
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32

  


  args = [
    'ffmpeg', '-f', 'dshow', '-i', 'video=USB Video Device', '-s', '1280x720',
    '-f', 'rawvideo', '-pix_fmt','rgb24', 'pipe:'
]
ffmpeg_proc = subprocess.Popen(args, stdout=subprocess.PIPE)


  


  but I get this error

  


  D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py "USB Video Device" 1280 720
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
video=USB Video Device: I/O error
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


  


  The inportant row is USB Video Device : I/O error
  
I've tried also to add shell=True to the Popen but with the same result.

  


  Doing some tests I found that using pycharm debug mode or simply lunching the same code inside "Pycharm Python Console" no more I/O error and all seems to work. I think something changes in the environment created for the subrocess but I wasn't able to understand what PyCharm is doing under the hood.

  


  Here the output inside PyCharm Python Console

  


  D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe "C:\Program Files\JetBrains\PyCharm Community Edition 2019.1.1\plugins\python-ce\helpers\pydev\pydevconsole.py" --mode=client --port=65058
import sys; print('Python %s on %s' % (sys.version, sys.platform))
sys.path.extend(['D:\\Projects\\Applications\\VideoCapture', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Application', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Compiler', 'D:/Projects/Applications/VideoCapture'])
PyDev console: starting.
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32
runfile('D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py', args=['USB Video Device', '1280', '720'], wdir='D:/Projects/Applications/VideoCapture/Sources/Application')
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, start: 111984.462000, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24(pc, progressive), 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
av_interleaved_write_frame(): Invalid argument
    Last message repeated 1 times
Error writing trailer of pipe:: Invalid argument
frame=  118 fps= 30 q=-0.0 Lsize=  313200kB time=00:00:03.93 bitrate=652306.1kbits/s dup=53 drop=0 speed=   1x


  


  Does anyone now how to fix this problem or have any knowledge on how PyCharm Python Console works ?