Recherche avancée

Sur d’autres sites (6822)

• How to pipe multiple images, being created in parallel with an index, to ffmpeg so that it can match the speed of image creation ?

  23 septembre 2020, par vishwas.mittal

  We've a system that spews out 4-channel png images frame-by-frame (we control the output format of these images as well, so we can use something else as long as it supports transparency). Right now, we're waiting for all the images and then encoding them with ffmpeg into a webm video file with vp8 (libvpx encoder). But we now want to pipeline these images to FFmpeg to encode into the WebM video simultaneously as the images are being spewed out so that we don't wait for ffmpeg to encode all the images afterwards.

  


  This is the current command, in python syntax :

  


  ['/usr/bin/ffmpeg', '-hide_banner', '-y', '-loglevel', 'info', '-f', 'rawvideo', '-pix_fmt', 'bgra', '-s', '1573x900', '-framerate', '30', '-i', '-', '-i', 'audio.wav', '-c:v', 'libvpx', '-b:v', '0', '-crf', '30', '-tile-columns', '2', '-quality', 'good', '-speed', '4', '-threads', '16', '-auto-alt-ref', '0', '-g', '300000', '-map', '0:v:0', '-map', '1:a:0', '-shortest', 'video.webm']
# for ease of read:
# /usr/bin/ffmpeg -hide_banner -y -loglevel info -f rawvideo -pix_fmt bgra -s 1573x900 -framerate 30 -i - -i audio.wav -c:v libvpx -b:v 0 -crf 30 -tile-columns 2 -quality good -speed 4 -threads 16 -auto-alt-ref 0 -g 300000 -map 0:v:0 -map 1:a:0 -shortest video.webm

proc = subprocess.Popen(args, stdin=subprocess.PIPE)


  


  Here is a sample example of passing the image to FFMPEG proc stdin as :

  


  # wait for the next frame to get ready
for frame_path in frame_path_list:
    while not os.path.exists(frame_path):
        time.sleep(0.25)
    frame = cv2.imread(frame_path, cv2.IMREAD_UNCHANGED)
    
    # put the frame in stdin so that it gets ready
    proc.stdin.write(frame.astype(np.uint8).tobytes())


  


  The current speed of this process is 0.135x which is a huge bottleneck for us. Earlier when we were taking input as -pattern_type glob -i images/*.png we were getting around 1x-1.2x for this on a single core. So, our conclusion is that we're getting bottlenecked by stdin and hence are looking for ways to pass input through multiple sources or somehow help ffmpeg to parallelize this effort - a few options that we're thinking of :

  


  

  • Somehow feed it to different pipes and make ffmpeg read from them.

  


  • Append a new image to ffmpeg without re-encoding the whole video, but we didn't find a way to do this with giving input images directly.

  


  


  But we haven't been able to get either of these working, open to any other solutions as well. Will really appreciate the help on this. Thanks !

  


• First input link main timebase do not match the corresponding second input link xfade timebase [duplicate]

  25 mars 2021, par Captain_Zaraki

  I am trying to concat two videos while adding transition effect. It is working fine on some videos but giving error on some.

  


  the command i am using is -

  


  ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "[0][1]xfade=transition=smoothup:duration=1:offset=1,format=yuv420p" output.mp4 


  


  the error i am getting is -

  


  [swscaler @ 0x558596a78800] deprecated pixel format used, make sure you did set range correctly

[Parsed_xfade_0 @ 0x558596a39ac0] First input link main timebase (1/12800) do not match the corresponding second input link xfade timebase (1/24000)

[Parsed_xfade_0 @ 0x558596a39ac0] Failed to configure output pad on Parsed_xfade_0

Error reinitializing filters!

Failed to inject frame into filter network: Invalid argument

Error while processing the decoded data for stream #1:0


  


• 'Source code does not match byte code' Android Studio

  26 août 2020, par Connoe

  I'm developing an Android video editing app using FFmpeg libraries in Android Studio version 4.01. When I try to debug, the debugger steps into the decompiler and flashes, 'Source code does not match byte code' across multiple steps through the decompiled code. The debugger also seems to be jumping around the decompiled code semi-randomly, for example : here, where logSlowDispatch is false but the debugger steps into the contents of the if statement anyway without checking and flashes 'Source code does not match byte code'. I've looked at alot of posts about this problem and have tried many of the suggested solutions from invalidate cache/restart to a fresh install of Android Studio to no avail. I've read that redundant or outdated gradle dependencies might have something to do with this, but removing some of these dependencies hasn't helped :

  


  apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.example.capstoneapplication"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        ndkVersion "21.3.6528147"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'com.android.support.constraint:constraint-layout:2.0.0'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    implementation 'com.writingminds:FFmpegAndroid:0.3.2'

    implementation 'org.florescu.android.rangeseekbar:rangeseekbar-library:0.3.0'

    implementation 'com.intuit.sdp:sdp-android:1.0.6'
}


  


  My code seems to be running properly and executing the ffmpeg command on the desired video between these jumps to the decompiler, but the video does not save. Here is a snippet from the java class that might be causing this :

  


      @Override
    public boolean onOptionsItemSelected(MenuItem menuItem){
        if(menuItem.getItemId()==R.id.trim){
            final AlertDialog.Builder alertDialog = new AlertDialog.Builder(com.example.capstoneapplication.VideoTrimmer.this);

            LinearLayout linLay = new LinearLayout(com.example.capstoneapplication.VideoTrimmer.this);
            linLay.setOrientation(LinearLayout.VERTICAL);
            LinearLayout.LayoutParams layPar = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
            layPar.setMargins(50, 0, 50, 100 );
            final EditText input = new EditText(com.example.capstoneapplication.VideoTrimmer.this);
            input.setLayoutParams(layPar);
            input.setGravity(Gravity.TOP|Gravity.START);
            input.setInputType(InputType.TYPE_TEXT_FLAG_CAP_SENTENCES);
            linLay.addView(input,layPar);

            alertDialog.setMessage("Enter Video Name");
            alertDialog.setTitle("Change Video Name");
            alertDialog.setView(linLay);
            alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            alertDialog.setPositiveButton("Submit", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    fileName = input.getText().toString();

                    try {
                        snipVideo(videoDurBar.getAbsoluteMinValue().intValue(), videoDurBar.getSelectedMaxValue().intValue(), fileName);
                    } catch ( FFmpegNotSupportedException e) {
                        e.printStackTrace();
                    }


                }
            });
            alertDialog.show();
        }
        return super.onOptionsItemSelected(menuItem);
    }

    private void snipVideo( int min, int max, String fileName) throws FFmpegNotSupportedException {

        File destFolder = new File("storage/emulated/0" + "/EditingApeSnippedVideos");
        if(!destFolder.exists()){
            destFolder.mkdir();
        }
        String fileExtension = ".mp4";
        destination = new File(destFolder, fileName + fileExtension);
        inputVideoPath = getPathFromUri(getApplicationContext(),uri);


        command = new String[]{"-ss", "" + min/1000 , "-y", "-i", inputVideoPath, "-t", ""+ (max-min)/1000 ,"-vcodec", "mpeg4", "-b:v","2097152","-b:a", "48000", "-ac","2","-ar","22050", destination.getAbsolutePath()};

        //testing command
        //command = new String []{"-y", "-i", inputVideoPath, "-ss", "00:00:02" , "-to", "00:00:03", "-c", "copy", destination.getAbsolutePath()};
        final FFmpeg ff = FFmpeg.getInstance(this);
        ff.loadBinary(new FFmpegLoadBinaryResponseHandler() {

            @Override
            public void onStart() {

                Log.i("VideoTrimmer","onStart");
            }

            @Override
            public void onFinish() {
                Log.i("VideoTrimmer","onFinish");
            }

            @Override
            public void onFailure() {
                Log.i("VideoTrimmer","onFailure");
            }

            @Override
            public void onSuccess() {
                Log.i("VideoTrimmer","Success");
                try {
                    ff.execute(command, new ExecuteBinaryResponseHandler());
                } catch (FFmpegCommandAlreadyRunningException e) {
                    Log.i("VideoTrimmer","FFmpegAlreadyRunning Exception");

                }
            }
        });
    }


  


  Has anyone found a solution to this debugger issue ?