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• Duration of wav file saved in S3 using AWS Lambda

  3 juin 2021, par Salim Shamim

  Objective

  


  To calculate the duration of a wav file which is saved in S3 by AWS Lambda using node.js. I had to add ffmpeg and ffprobe executable inside a lambda layer (Downloaded linux-64 version from here). These files could be found in /opt folder on lambda file system.

  


  What I have tried

  


  I have been trying using ffprobe in numerous ways, but I get Invalid Data as error.
Here's one example

  


  const AWS = require('aws-sdk');
const s3 = new AWS.S3();
const fs = require('fs');
const ffmpeg = require('fluent-ffmpeg');

exports.handler = async function(event) {
    let path = await load();
    console.log(`Saved Path ${path}`);

    ffmpeg.setFfmpegPath('/opt/ffmpeg');
    ffmpeg.setFfprobePath("/opt/ffprobe");

    let dur = await duration(path).catch(err => {
        console.log(err);
    })
    console.log(dur);
}


function duration(path) {
    return new Promise((resolve, reject) => {
        ffmpeg(path).ffprobe(path, function(err, metadata) {
            //console.dir(metadata); // all metadata
            if (err) {
                reject(err);
            }
            else {
                resolve(metadata.format.duration);

            }
        });
    })
}

async function listFiles(path) {
    console.log('list files');
    return new Promise((resolve, reject) => {
        fs.readdir(path, (err, files) => {
            if (err) {
                console.error('Error in readdir');
                reject(err);
            }
            else {
                console.log('recieved files');
                resolve(files);
            }

        });

    });

}

async function load() {
    return new Promise((resolve, reject) => {
        let params = {
            Key: 'Fanfare60.wav',
            Bucket: 'samplevideosshamim'
        };
        console.log(`Getting s3 object : ${JSON.stringify(params)}`);
        s3.getObject(params, (err, data) => {
            if (err) {
                console.error(err);
                reject(err);
            }
            else if (data) {
                console.log('Recieved Data');
                let path = `/tmp/${params.Key}`;
                console.log('Path: ' + path);
                fs.writeFileSync(path, data.body);
                resolve(path);
            }
        });
    });

}


  


  Error :

  


  Error: ffprobe exited with code 1&#xA;ffprobe version 4.2.1-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2007-2019 the FFmpeg developers&#xA;  built with gcc 6.3.0 (Debian 6.3.0-18&#x2B;deb9u1) 20170516&#xA;  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg&#xA;  libavutil      56. 31.100 / 56. 31.100&#xA;  libavcodec     58. 54.100 / 58. 54.100&#xA;  libavformat    58. 29.100 / 58. 29.100&#xA;  libavdevice    58.  8.100 / 58.  8.100&#xA;  libavfilter     7. 57.100 /  7. 57.100&#xA;  libswscale      5.  5.100 /  5.  5.100&#xA;  libswresample   3.  5.100 /  3.  5.100&#xA;  libpostproc    55.  5.100 / 55.  5.100&#xA;/tmp/Fanfare60.wav: Invalid data found when processing input&#xA;&#xA;    at ChildProcess.<anonymous> (/var/task/node_modules/fluent-ffmpeg/lib/ffprobe.js:233:22)&#xA;    at ChildProcess.emit (events.js:314:20)&#xA;    at ChildProcess.EventEmitter.emit (domain.js:483:12)&#xA;    at Process.ChildProcess._handle.onexit (internal/child_process.js:276:12)&#xA;</anonymous>

  


  I am guessing it doesn't support wav format, but internet searches provide no proof of that.

  


  A point to note here is, I was able to get the duration of a local file when I ran this code on my local machine, but I have a windows machine, so perhaps only linux executable of ffprobe has issue ?

  


  Possible Solutions I am looking for

  


  

  1. Is there a way to specify format ?

  


  2. Can I use a different library (code example for the same) ?

  


  3. Any possible way to get duration of a wav file in the mentioned scenario (AWS Lambda NodeJS and S3 file (private file) ?

  


  


• Merge Audio with Video is not working probably using android 9 & 8

  22 juillet 2021, par ebdaa app

  I am trying to use the following code to merge audio with video,

  


      cmd = "-stream_loop -1 -i " + videoUri + " -i " + audioPath + " -shortest -map 0:v:0 -map 1:a:0 -y " + videoOutputPath;

    long executionId = FFmpeg.executeAsync(cmd, new ExecuteCallback() {

        @Override
        public void apply(final long executionId, final int returnCode) {
            if (returnCode == RETURN_CODE_SUCCESS) {
                playVedio(videoOutputPath);
            } else {
                ErrorLogger();
            }
        }
    });


  


  as you can see the above code does the following things :

  


  

  1. replace audio in video with new one.

  


  2. loop the video until the new audio ends.

  


  


  everything works perfectly when trying to run the code using both android 11 and 10 , however , when try to use android 9 or 8 , the first and the last 2 seconds of the new audio will be trimmed in the generated video and I am not able to know why

  


  I am using 4.4 version of the mobile-ffmpeg

  


   com.arthenica:mobile-ffmpeg-full:4.4


  


  please find the log from android 8/9

  


   I/mobile-ffmpeg: ffmpeg version v4.4-dev-416
      Copyright (c) 2000-2020 the FFmpeg developers
       built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
       configuration: --cross-prefix=i686-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-x86/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=i686 --cpu=i686 --cc=i686-linux-android24-clang --cxx=i686-linux-android24-clang++ --extra-libs='-L/home/taner/Projects/mobile-ffmpeg/prebuilt/android-x86/cpu-features/lib -lndk_compat' --target-os=android --disable-neon --disable-asm --disable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-mediacodec
       libavutil      56. 55.100 / 56. 55.100
       libavcodec     58. 96.100 / 58. 96.100
       libavformat    58. 48.100 / 58. 48.100
       libavdevice    58. 11.101 / 58. 11.101
       libavfilter     7. 87.100 /  7. 87.100
       libswscale      5.  8.100 /  5.  8.100
       libswresample   3.  8.100 /  3.  8.100
 I/mobile-ffmpeg: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Download/Videoes/share_video_2.mp4':
       Metadata:
         major_brand     : 
     isom
         minor_version   : 
     512
         compatible_brands: 
     isomiso2avc1mp41
         encoder         : 
 I/mobile-ffmpeg: Lavf58.44.100
       Duration: 
     00:00:08.21
     , start: 
     0.000000
     , bitrate: 
     477 kb/s
         Stream #0:0
     (und)
     : Video: h264 (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 473 kb/s
     , 
     29.97 fps, 
     29.97 tbr, 
     30k tbn, 
     59.94 tbc
      (default)
         Metadata:
           handler_name    : 
     VideoHandler
 I/mobile-ffmpeg: Input #1, mp3, from '/storage/emulated/0/Download/001001.mp3':
 I/mobile-ffmpeg:   Metadata:
         album           : 
     Mishary Alafasi Musshaf
         artist          : 
     Mishary Alafasi
         comment         : 
     www.mp3quran.net
         genre           : 
     Quran
         title           : 
     Al-Fatihah
         date            : 
     2007
         encoder         : 
     Lavf58.48.100
       Duration: 
     00:00:12.41
     , start: 
     0.011995
     , bitrate: 
     132 kb/s
         Stream #1:0
 I/mobile-ffmpeg: : Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
         Metadata:
           encoder         : 
     Lavf
         Stream #1:1
     : Video: png, pal8(pc), 200x159 [SAR 2835:2835 DAR 200:159]
     , 
     90k tbr, 
     90k tbn, 
     90k tbc
      (attached pic)
         Metadata:
           comment         : 
     Cover (front)
 I/mobile-ffmpeg: Stream mapping:
       Stream #0:0 -> #0:0
      (h264 (native) -> mpeg4 (native))
       Stream #1:0 -> #0:1
      (mp3 (mp3float) -> aac (native))
     Press [q] to stop, [?] for help
 I/mobile-ffmpeg: frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A    
 W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0xd429d2e0] sws_param option is deprecated and ignored
 D/EGL_emulation: eglMakeCurrent: 0xf08c6ee0: ver 2 0 (tinfo 0xf08d2810)
 I/mobile-ffmpeg: Output #0, mp4, to '/storage/emulated/0/Download/v001001.mp4':
       Metadata:
         major_brand     : 
     isom
         minor_version   : 
 I/mobile-ffmpeg: 512
         compatible_brands: 
     isomiso2avc1mp41
         encoder         : 
     Lavf58.48.100
         Stream #0:0
     (und)
     : Video: mpeg4 (mp4v / 0x7634706D), yuv420p(progressive), 640x360 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s
     , 
     29.97 fps, 
     30k tbn, 
     29.97 tbc
      (default)
         Metadata:
           handler_name    : 
     VideoHandler
           encoder         : 
     Lavc58.96.100 mpeg4
         Side data:
 I/mobile-ffmpeg:       
     cpb: 
     bitrate max/min/avg: 0/0/200000 buffer size: 0 
     vbv_delay: N/A
 I/mobile-ffmpeg:     Stream #0:1
     : Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
         Metadata:
           encoder         : 
     Lavc58.96.100 aac
 I/mobile-ffmpeg: frame=   83 fps=0.0 q=30.2 size=       0kB time=00:00:02.78 bitrate=   0.1kbits/s speed=5.54x    
 I/mobile-ffmpeg: frame=  199 fps=198 q=31.0 size=     256kB time=00:00:06.64 bitrate= 315.8kbits/s speed=6.61x    
 I/mobile-ffmpeg: frame=  300 fps=199 q=31.0 size=     512kB time=00:00:10.00 bitrate= 419.1kbits/s speed=6.65x    
 I/mobile-ffmpeg: frame=  372 fps=204 q=31.0 Lsize=     733kB time=00:00:12.39 bitrate= 484.5kbits/s speed= 6.8x    
     video:526kB audio:195kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 
     1.630239%
 I/mobile-ffmpeg: [aac @ 0xd431fc00] Qavg: 164.571


  


• Audio on TS File Falls Progressively Out of Sync

  8 août 2021, par Steve Brown

  I would really appreciate some help with this...

  


  I have a .ts file I've downloaded from the internet, when I play in Quicktime the video progressively falls behind the audio. It becomes noticeable after a couple of minutes and is a few seconds out after about ten minutes. It plays fine in VLC, but I want to be able to play on my AppleTV which does the same as Quicktime.

  


  I've tried everything I can think of to resolve...

  


  

  • Convert with VLC, which does work, but every few seconds the audio skips.

  


  • Convert with Handbrake, which again works, but every few seconds the audio skips like with VLC.

  


  • Convert with FFMpeg using -async, but I get the same result again with the audio skips.

  


  • Extracted the audio and video to two separate files and recreated a new file with FFMpeg, this makes no difference and is the same as playing the original file.

  


  • Tried "stretching" the audio with FFMpeg using "aresample=async=1000", which synchronises but the audio is distorted.

  


  


  I think the audio skips I'm getting from the -async option are caused because the audio is being trimmed to sync with the video. What I want to do is adjust the video to fit with the audio and leave the audio unchanged.

  


  I've tried to do this with -vsync, but the the results are the same as the original file. The FFMpeg user guide says the following :

  


  With -map you can select from which stream the timestamps should be taken. You can leave either video or audio unchanged and sync the remaining stream(s) to the unchanged one.

  


  But I cannot figure out the syntax. This is what I'm trying but the output is the same as the original...

  


  ffmpeg -vsync 1 -I test.ts -map 0:1 -map 0:0 -y test.mp4

  


  I've tried the above using vsync with 0, 1 and 2, but the result is still the same.

  


  Could anyone please help me with the syntax to sync the video stream to the audio stream and leave the audio unchanged ? Or suggest an alternative method I could use ?

  


  Any help would be really, really appreciated. Thanks.

  


  Here is the ffprobe for test.ts...

  


  ffprobe version 4.4 Copyright (c) 2007-2021 the FFmpeg developers
built with Apple clang version 12.0.0 (clang-1200.0.32.29)
configuration : —prefix=/usr/local/Cellar/ffmpeg/4.4_1 —enable-shared —enable-pthreads —enable-version3 —enable-avresample —cc=clang —host-cflags= —host-ldflags= —enable-ffplay —enable-gnutls —enable-gpl —enable-libaom —enable-libbluray —enable-libdav1d —enable-libmp3lame —enable-libopus —enable-librav1e —enable-librubberband —enable-libsnappy —enable-libsrt —enable-libtesseract —enable-libtheora —enable-libvidstab —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libxvid —enable-lzma —enable-libfontconfig —enable-libfreetype —enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libspeex —enable-libsoxr —enable-libzmq —enable-libzimg —disable-libjack —disable-indev=jack —enable-videotoolbox
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
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100
Input #0, mpegts, from 'TEst.ts' :
Duration : 02:13:05.51, start : 1.406000, bitrate : 4579 kb/s
Program 1
Metadata :
service_name : Service01
service_provider : FFmpeg
Stream #0:0[0x100] : Video : h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080, 23.98 tbr, 90k tbn, 1411200000.00 tbc
Stream #0:1[0x101] : Audio : aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 195 kb/s