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• audio extracted from flv file via ffmpeg is of shorter duration than the actual flv video [closed]

  11 janvier 2013, par user1961143

  I have extracted audio from flv file via ffmpeg using this command :-

  ffmpeg -i 164_29.flv v19.mp3

  The flv videos duration is 3 minutes but the audio is of 2 mins 20 seconds only. On searching i found that the silent pieces of audio are removed when generating audio from ffmpeg. But i need the audio file to be of exactly same duration as flv video as later i need to put this audio in the flv video itself. Please help as this is urgent for our project. I am running the FFMpeg via .net windows service, so in case you know any other tool which can extract the audio of same duration as video and can be run via .net, it would be useful too.

  Console output :

  C :\Users\ritika.thakur>ffmpeg -i 164_29.flv v19.mp3
  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version —disable-pthreads —enable-runtime-cpudetect —enable-avisynth —enable-bzlib —enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut -enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger -enable-libspeex —enable-libtheora —enable-libutvideo —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libx264 —enale-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  Input #0, flv, from '164_29.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  Duration : 00:03:04.08, start : 0.000000, bitrate : 283
  kb/s
  Stream #0:0 : Video : flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  Stream #0:1 : Audio : nellymoser, 22050 Hz, mono, flt
  Output #0, mp3, to 'v19.mp3' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  TSSE : Lavf54.37.100
  Stream #0:0 : Audio : mp3, 22050 Hz, mono, fltp
  Stream mapping :
  Stream #0:1 -> #0:0 (nellymoser -> libmp3lame)
  Press [q] to stop, [?] for help
  size= 567kB time=00:03:04.13 bitrate= 25.2kbits/s video:0kB audio:567kB subtitle:0 global headers:0kB muxing overhead 0.051503%

  This is the output of console for both video and audio file separately :-

  Microsoft Windows [Version 6.1.7601]
  Copyright (c) 2009 Microsoft Corporation. All rights reserved.

  C :\Users\ritika.thakur>ffmpeg -i v19.mp3

  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3
  —disable-pthreads —enable-runtime-cpudetect —enable-avisynth —enable-bzlib
  — enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-
  amrwb —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut -
   enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger -
   enable-libspeex —enable-libtheora —enable-libutvideo —enable-libvo-aacenc —
  enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libx264 —enab
  le-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  [mp3 @ 0056e780] max_analyze_duration 5000000 reached at 5015510
  Input #0, mp3, from 'v19.mp3' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  encoder : Lavf54.37.100
  Duration : 00:02:25.14, start : 0.000000, bitrate : 32 kb/s
  Stream #0:0 : Audio : mp3, 22050 Hz, mono, s16, 32 kb/s
  At least one output file must be specified

  C :\Users\ritika.thakur>ffmpeg -i 164_29.flv

  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3
  —disable-pthreads —enable-runtime-cpudetect —enable-avisynth —enable-bzlib
  — enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-
  amrwb —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut -
   enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger -
   enable-libspeex —enable-libtheora —enable-libutvideo —enable-libvo-aacenc —
  enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libx264 —enab
  le-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  Input #0, flv, from '164_29.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  Duration : 00:03:04.08, start : 0.000000, bitrate : 283 kb/s
  Stream #0:0 : Video : flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  Stream #0:1 : Audio : nellymoser, 22050 Hz, mono, flt
  At least one output file must be specified

  If you see the duration of video is of 3:04 but audio extracted from it is of 2:25 only.
  Actually i am using ffmpeg overlay to show two videos side by side in our debate project for the client. Now ffmpeg takes audio from first video by default. But we want the audio from both videos together as a debate going on. Hence I thought of a solution to extract audio from both videos and merge them and than apply them to the overlayed video. This will all work perfectly only if I get the complete audio from the video file i.e. of equal duration.
  For more information i am writing here the overlay command we are using :-

   **ffmpeg -i 164_29.flv  -vf "[in] scale=359:320, pad=2*iw+6:ih
  
    [left];    movie=164_30.flv, scale=359:320 [right]; [left][right] 
  
    overlay=365:0  [out]" -b:v 3600k -y a1.flv**
  
  
  
   **This is the console output of this overlay command:-**

  C :\Users\ritika.thakur>ffmpeg -i 164_29.flv -vf "[in] scale=359:320, pad=2*iw+6
  :ih [left] ; movie=164_30.flv, scale=359:320 [right] ; [left][right] overlay=365:0
  [out]" -b:v 3600k -y a1.flv
  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3
  —disable- pthreads —enable-runtime-cpudetect —enable- avisynth
  —enable-bzlib —enable
  -frei0r
  —enable-libass —enable-libopencore-amrnb —enable-libopencore-amrwb
  —enable- libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut
  —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger
  — enable-
  libspeex —enable-libtheora —enable- libutvideo
  —enable-libvo-aacenc —
  enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx
  —enable-libx264 —enab
  le-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  Input #0, flv, from '164_29.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  Duration : 00:03:04.08, start : 0.000000, bitrate : 283 kb/s
  Stream #0:0 : Video : flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  Stream #0:1 : Audio : nellymoser, 22050 Hz, mono, flt
  Output #0, flv, to 'a1.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  encoder : Lavf54.37.100
  Stream #0:0 : Video : flv1 ([2][0][0][0] / 0x0002), yuv420p, 724x320, q=2-31,
  3600 kb/s, 1k tbn, 1k tbc
  Stream #0:1 : Audio : mp3 ([2][0][0][0] / 0x0002), 22050 Hz, mono, fltp
  Stream mapping :
  Stream #0:0 -> #0:0 (flv -> flv)
  Stream #0:1 -> #0:1 (nellymoser -> libmp3lame)
  Press [q] to stop, [?] for help
  frame= 83 fps=0.0 q=4.1 size= 343kB time=00:00:07.01 bitrate= 401.2kbits/s
  frame= 149 fps=149 q=2.3 size= 861kB time=00:00:14.87 bitrate= 473.9kbits/s
  frame= 223 fps=148 q=2.0 size= 1492kB time=00:00:22.00 bitrate= 555.4kbits/s
  frame= 308 fps=153 q=2.0 size= 2195kB time=00:00:28.64 bitrate= 627.8kbits/s
  frame= 391 fps=156 q=2.0 size= 2858kB time=00:00:34.06 bitrate= 687.4kbits/s
  frame= 478 fps=159 q=2.0 size= 3541kB time=00:00:39.55 bitrate= 733.4kbits/s
  frame= 547 fps=156 q=2.0 size= 4293kB time=00:00:46.80 bitrate= 751.5kbits/s
  frame= 645 fps=161 q=2.0 size= 4896kB time=00:00:51.63 bitrate= 776.8kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 16 times
  frame= 731 fps=162 q=2.0 size= 5418kB time=00:00:56.61 bitrate= 784.0kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 49 times
  frame= 794 fps=158 q=2.0 size= 5802kB time=00:01:02.37 bitrate= 762.1kbits/s
  frame= 886 fps=160 q=2.0 size= 6363kB time=00:01:07.00 bitrate= 778.0kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 29 times
  frame= 954 fps=158 q=2.0 size= 6785kB time=00:01:13.31 bitrate= 758.2kbits/s
  frame= 1056 fps=162 q=2.0 size= 7377kB time=00:01:16.94 bitrate= 785.4kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 30 times
  frame= 1130 fps=161 q=2.0 size= 7789kB time=00:01:22.19 bitrate= 776.3kbits/s
  frame= 1217 fps=162 q=2.0 size= 8372kB time=00:01:27.68 bitrate= 782.1kbits/s
  frame= 1306 fps=163 q=2.0 size= 9074kB time=00:01:32.86 bitrate= 800.5kbits/s
  frame= 1393 fps=163 q=1.6 size= 9700kB time=00:01:38.41 bitrate= 807.3kbits/s
  frame= 1475 fps=163 q=2.0 size= 10278kB time=00:01:44.03 bitrate= 809.4kbits/s
  frame= 1568 fps=164 q=2.0 size= 10825kB time=00:01:48.52 bitrate= 817.1kbits/s
  frame= 1658 fps=165 q=2.0 size= 11439kB time=00:01:53.44 bitrate= 826.0kbits/s
  frame= 1734 fps=165 q=2.0 size= 12027kB time=00:01:58.31 bitrate= 832.7kbits/s
  frame= 1792 fps=162 q=2.0 size= 12579kB time=00:02:03.41 bitrate= 835.0kbits/s
  frame= 1851 fps=160 q=2.0 size= 13284kB time=00:02:10.74 bitrate= 832.3kbits/s
  frame= 1929 fps=160 q=2.0 size= 13922kB time=00:02:16.85 bitrate= 833.3kbits/s
  frame= 2010 fps=160 q=2.0 size= 14652kB time=00:02:23.39 bitrate= 837.1kbits/s
  frame= 2102 fps=161 q=2.0 size= 15329kB time=00:02:28.86 bitrate= 843.6kbits/s
  frame= 2200 fps=162 q=2.0 size= 15963kB time=00:02:34.08 bitrate= 848.7kbits/s
  frame= 2292 fps=163 q=2.0 size= 16554kB time=00:02:38.96 bitrate= 853.1kbits/s
  frame= 2378 fps=163 q=2.0 size= 17157kB time=00:02:44.50 bitrate= 854.4kbits/s
  frame= 2468 fps=164 q=2.0 size= 17826kB time=00:02:49.50 bitrate= 861.5kbits/s
  frame= 2564 fps=165 q=2.0 size= 18489kB time=00:02:54.43 bitrate= 868.3kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 15 times
  frame= 2647 fps=165 q=2.0 size= 19079kB time=00:02:59.53 bitrate= 870.6kbits/s
  frame= 2728 fps=165 q=2.0 Lsize= 19703kB time=00:03:04.13 bitrate= 876.6kbits/
  s video:19006kB audio:567kB subtitle:0 global headers:0kB muxing overhead 0.663315%

  Everything is working fine except that we want audio from both videos playing together in final overlayed file. I would be highly grateful if you can help in this and let me know if its possible to do via ffmpeg or not.

• Evolution of Multimedia Fiefdoms

  1er octobre 2014, par Multimedia Mike — General

  I want to examine how multimedia fiefdoms have risen and fallen through the years.

  
  
  

  Back in the day, the multimedia fiefdoms were built around the formats put forth by competing companies : there was Microsoft/WMV, Apple/MOV, and Real/RM as the big contenders. On2 always wanted to be a player in this arena but could never quite catch a break. A few brave contenders held the line for open source and also for the power users who desired one application that could handle everything (my original motivation for wanting to get into multimedia hacking).

  The computer desktop was the battleground for internet-based media stream. Whatever happened to those days ? Actually, if memory serves, Flash-based video streaming stepped on all of them.

  Over the last 6-7 years, the battleground has expanded to cover mobile devices, where Flash’s impact has… lessened. During this time, multimedia technology pretty well standardized on a particular stack, namely, the MPEG (MP4/H.264/AAC) stack.

  The belligerents in this war tried for years to effectively penetrate new territory, namely, the living room where the television lived. This had been slowgoing for years due to various user interface and content issues, but steadily improved.

  Last April, Amazon announced their entry into the set-top box market with the Fire TV. That was when it suddenly crystallized for me that the multimedia ecosystem has radically shifted. Now, the multimedia fiefdoms revolve around access to content via streaming services.

  Off the top of my head, here are some of the fiefdoms these days (fiefdoms I have experience using) :

  • Netflix (subscription streaming)
  • Amazon (subscription, rental, and purchased streaming)
  • Hulu Plus (subscription streaming)
  • Apple (rental and purchased media)

  I checked some results on Can I Stream.It ? (which I refer to often) and found a bunch more streaming fiefdoms such as Google (both Play and YouTube, which are separate services), Sony, Xbox 360, Crackle, Redbox Instant, Vudu, Target Ticket, Epix, Sony, SnagFilms, and XFINITY StreamPix. And surely, these are probably just services available in the United States ; I know other geographical regions have their own fiefdoms.

  What happened ?

  When I got into multimedia hacking, there were all these disparate, competing ecosystems. As a consumer, I didn’t care where the media came from, I just wanted to play it. That’s what inspired me to work on open source multimedia projects. Now I realize that I have the same problem 10-15 years later : there are multiple competing ecosystems. I might subscribe to fiefdoms X and Y, but am frustrated to learn that something I’d like to watch is only available through fiefdom Z. Very few of these fiefdoms can be penetrated using open source technology.

  I’m not really sure about the point about this whole post. Multimedia technology seems really standardized these days. But that’s probably just my perspective because I have spent way too long focusing on a few areas of multimedia technology such as audio and video coding. It’s interesting that all these services probably leverage the same limited number of codecs. Their differentiation comes from the catalog of content that each is able to license for streaming. There are different problems to solve in the multimedia arena now.

• File conversion to mp3 returning failure everytime using flutter package ffmpeg_kit_flutter

  6 novembre 2024, par Sanath balthar

  I am trying to convert a .wav audio file generated from a flutter's text to speech package - "flutter_tts" to mp3 file but it is failing everytime.
I have written the below code for file conversion. I have imported the package ffmpeg_kit_flutter. It doesnt even show why the conversion is failing.
I have looked up in stackoverflow and other sites but could not find any relevant solutions. I am using vscode as editor. I have attached flutter doctor output below as well. Could anyone please guide me ? Let me know if you need more information.

  


  List<string> command = [&#xA;              &#x27;-i&#x27;, &#x27;$filePath/998tts.wav&#x27;,&#xA;              &#x27;-c:a&#x27;, &#x27;mp3&#x27;,&#xA;              &#x27;$filePath/998.mp3&#x27;&#xA;            ];&#xA;&#xA; await FFmpegKitConfig.enableLogs();&#xA;            FFmpegKitConfig.enableLogCallback((log) =>print(&#x27;FFmpeg log: $log&#x27;));        &#xA;          FFmpegSession result = await FFmpegKit.executeWithArguments(command);&#xA;          dynamic resultcode = await result.getReturnCode();&#xA;          dynamic resultlogs = await result.getLogsAsString();&#xA;          // FFmpegKitConfig.setLogLevel(logLevel)&#xA;          if(ReturnCode.isSuccess(resultcode)){&#xA;          print("file saved after conversion at $filePath/998.mp3 and result : Success and logs : $resultlogs");&#xA;          }&#xA;          else{&#xA;            print("Result : failure and logs : $resultlogs");&#xA;          }&#xA;&#xA;Flutter doctor output:&#xA;[√] Flutter (Channel stable, 3.19.6, on Microsoft Windows [Version 10.0.22631.3296], locale en-IN)&#xA;[√] Windows Version (Installed version of Windows is version 10 or higher)&#xA;[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)&#xA;[√] Chrome - develop for the web&#xA;[!] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.9.5)&#xA;X Visual Studio is missing necessary components. Please re-run the Visual Studio installer for the "Desktop development with C&#x2B;&#x2B;"&#xA;workload, and include these components:&#xA;MSVC v142 - VS 2019 C&#x2B;&#x2B; x64/x86 build tools&#xA;- If there are multiple build tool versions available, install the latest&#xA;C&#x2B;&#x2B; CMake tools for Windows&#xA;Windows 10 SDK&#xA;[√] Android Studio (version 2023.2)&#xA;[√] VS Code (version 1.89.0)&#xA;[√] Connected device (3 available)&#xA;[√] Network resources&#xA;&#xA;! Doctor found issues in 1 category.&#xA;&#xA;</string>

  


  Edit : Attaching error logs :

  


  I/flutter (25865): Loading ffmpeg-kit-flutter.
D/ffmpeg-kit-flutter(25865): FFmpegKitFlutterPlugin com.arthenica.ffmpegkit.flutter.FFmpegKitFlutterPlugin@a5d9788 started listening to events on io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler$EventSinkImplementation@4cfb5f2.
I/flutter (25865): Loaded ffmpeg-kit-flutter-android-audio-arm64-v8a-6.0.3.
I/flutter (25865): Result : failure and logs : ffmpeg version n6.0 Copyright (c) 2000-2023 the FFmpeg developers
I/flutter (25865):   built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)

I/flutter (25865):   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/Users/sue/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/opt/homebrew/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile