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• Converting `webm` to `mov` format using ffmpeg loses transparency - how can I keep it ?

  10 mars 2023, par M.A Shahbazi

  I am trying to convert a webm video to mov format without losing quality and transparency using the following command :

  


  ffmpeg -c:v libvpx-vp9 -i input.webm ouput.mov


  


  The video gets converted, but it loses transparency and the background of video is black.

  


  I also tried the following command :

  


  ffmpeg -c:v png -i input.webm output.mov


  


  But it gives me the following error output :

  


    libavutil      58.  3.100 / 58.  3.100
  libavcodec     60.  4.100 / 60.  4.100
  libavformat    60.  4.100 / 60.  4.100
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  4.100 /  9.  4.100
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
[png @ 0000028041ca7000] Invalid PNG signature 0x824983420031F031.
[matroska,webm @ 0000028041c91240] Could not find codec parameters for stream 0 (Video: png, none(pc, progressive), 800x800): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, matroska,webm, from 'hero.webm':
  Metadata:
    COMPATIBLE_BRANDS: qt
    creation_time   : 2023-02-23T10:43:46.703800Z
    MAJOR_BRAND     : qt
    MINOR_VERSION   : 537199360
    ENCODER         : Lavf59.35.100
  Duration: 00:00:09.00, start: 0.000000, bitrate: 1378 kb/s
  Stream #0:0: Video: png, none(pc, progressive), 800x800, SAR 1:1 DAR 1:1, 24 fps, 24 tbr, 1k tbn
    Metadata:
      alpha_mode      : 1
      ENCODER         : Lavc59.56.100 libvpx-vp9
      DURATION        : 00:00:09.000000000
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[png @ 0000028041ca7680] Invalid PNG signature 0x824983420031F031.
Error while decoding stream #0:0: Invalid data found when processing input
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed!


  


  How can I maintain transparency when converting from webm to mov format ?

  


  Here's the video info in case it can be helpful :

  


  {
    "streams": [
        {
            "index": 0,
            "codec_name": "vp9",
            "codec_long_name": "Google VP9",
            "profile": "Profile 0",
            "codec_type": "video",
            "codec_tag_string": "[0][0][0][0]",
            "codec_tag": "0x0000",
            "width": 800,
            "height": 800,
            "coded_width": 800,
            "coded_height": 800,
            "closed_captions": 0,
            "film_grain": 0,
            "has_b_frames": 0,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "1:1",
            "pix_fmt": "yuv420p",
            "level": -99,
            "color_range": "tv",
            "field_order": "progressive",
            "refs": 1,
            "r_frame_rate": "24/1",
            "avg_frame_rate": "24/1",
            "time_base": "1/1000",
            "start_pts": 0,
            "start_time": "0.000000",
            "disposition": {
                "default": 0,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "alpha_mode": "1",
                "ENCODER": "Lavc59.56.100 libvpx-vp9",
                "DURATION": "00:00:09.000000000"
            }
        }
    ],
    "format": {
        "filename": ".\\hero.webm",
        "nb_streams": 1,
        "nb_programs": 0,
        "format_name": "matroska,webm",
        "format_long_name": "Matroska / WebM",
        "start_time": "0.000000",
        "duration": "9.000000",
        "size": "1550466",
        "bit_rate": "1378192",
        "probe_score": 100,
        "tags": {
            "COMPATIBLE_BRANDS": "qt  ",
            "creation_time": "2023-02-23T10:43:46.703800Z",
            "MAJOR_BRAND": "qt  ",
            "MINOR_VERSION": "537199360",
            "ENCODER": "Lavf59.35.100"
        }
    }
}


  


• Can't fix this ffmpeg, NoClassDefFoundError

  15 mars 2023, par noob234

  I am trying to get the video duration with this library import org.bytedeco.javacv.FFmpegFrameGrabber;

  


  When I upload this mp4 video (https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4), I get this error message :
java.lang.NoClassDefFoundError: Could not initialize class org.bytedeco.ffmpeg.global.avutil

  


  It will break when trying to get the 'grabber' :

  


  private void videoInfo(MultipartFile file) {
    try (FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(file.getInputStream())) { // on this line it will break :(
        grabber.start();
        long durationMs = grabber.getLengthInTime();
    } catch (FrameGrabber.Exception e) {
        throw new RuntimeException(e);
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}


  


  This is my build.gradle :

  


  plugins {
    id 'java'
    id 'org.springframework.boot' version '2.7.9'
    id 'io.spring.dependency-management' version '1.0.15.RELEASE'
}

group = 'com.nob234'
version = '0.0.1-SNAPSHOT'

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    compileOnly 'org.projectlombok:lombok'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
    implementation 'org.springdoc:springdoc-openapi-ui:1.6.9'
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    runtimeOnly 'org.postgresql:postgresql'
    // for logging
    implementation 'org.slf4j:slf4j-api:1.7.30'
    implementation 'org.slf4j:jcl-over-slf4j:1.7.30'
    implementation 'org.slf4j:log4j-over-slf4j:1.7.30'
    implementation 'ch.qos.logback:logback-classic:1.2.3'
    implementation 'org.bytedeco:javacv:1.5.8'
}

tasks.named('test') {
    useJUnitPlatform()
}


  


  This is my ffmpeg version :

  


  ffmpeg version 6.0-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 12.2.0 (Rev10, 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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --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      58.  2.100 / 58.  2.100
libavcodec     60.  3.100 / 60.  3.100
libavformat    60.  3.100 / 60.  3.100
libavdevice    60.  1.100 / 60.  1.100
libavfilter     9.  3.100 /  9.  3.100
libswscale      7.  1.100 /  7.  1.100
libswresample   4. 10.100 /  4. 10.100
libpostproc    57.  1.100 / 57.  1.100


  


  Please keep in mind that I use Java 8 in this project and I hope this issue is reproducible. If you want more info please leave a comment.

  


• Problem of video duration with a mp4 file

  7 avril 2023, par user1018697

  I have a video file with a duration of 1:24.
I tryed to edit the file with adobe premier 2023 and the duration of file read is 1:14...
Framerate of the video is 24 i/s, i tryed to change to 30 i/s with ffmpeg but the problem persists.

  


  I share the file here :
https://drive.google.com/file/d/1A2DxqJL7whGRrRraeCuyaJ46mAra1n81/view?usp=share_link

  


  If you try to edit the file on the adobe public website, you can reproduce it :
https://express.adobe.com/fr-FR/tools/merge-videos

  


  Can anyone helps me ?