Recherche avancée

Sur d’autres sites (10278)

• TV audio extracted using ffmeg does not work in iOS (but it works in the simulator)

  26 janvier 2014, par Genar

  I can process a TV signal (well I have a .ts video which comes from a TV channel), using ffmpeg but the audio cannot be understood in an iPhone/iPad. The most strange is that the audio (and video) works properly in the simulator (and also in an Android real device, but this is another point), but in a real iPhone/iPad device the video is OK but the audio sounds like a metallic box and nothing can be understood.

  I have created the ffmpeg libraries for iOS (I have tried the version 2.0.2 and also the version 2.1.3) using the information provided in the following link :

  Installing ffmpeg ios libraries armv7, armv7s, i386 and universal on Mac with 10.8

  The aforementioned link explains how to create the ffmpeg include folders and the universal libraries which I have included into my project (the libraries created are : libavcodec.a, libavdevice.a, libavfilter.a, libavformat.a, libavresample.a, libavutil.a, libswresample.a and libswscale.a).

  The sampling frequency used is 48000.

  The audio got from ffmpeg is then stored into a buffer and then "inserted" using OpenAL ; but, from the same TV content (the same .ts video file) the audio data which is generated from ffmpeg in an iPhone/iPad is totally different from the audio data generated from ffmpeg in the simulator (which can reproduce both the audio and video perfectly).

  Thanks in advance,

• How do I convert videos to mp4 for use on Android ? [on hold]

  11 avril 2014, par user3525211

  I am trying to use ffmpeg to convert videos (flv,mov,etc) to mp4 for use on android mobile phones. The conversion seemingly works fine. I can see the mp4s on my iphone. But when I test it out on android phones it does not work. I have been googling this problem for two weeks now and I have tried probably 50 different variations of ffmpeg command lines, but without success. I tried upgrading to the latest ffmpeg on my linux server, but I am not linux savvy and am not sure that it did what it was supposed to. I am at my wits end. Am I going about this wrong ? Is ffmpeg the right tool ? Any ideas ?

  Here is the command line I have used to successfully convert to mp4s that work on iphone :
  ffmpeg -y -i input.mov -s 480x270 -r 30000/1001 -b 128k -vcodec libx264 -vpre slow -vpre ipod320 -acodec libfaac -ac 2 -ar 44100 -ab 128k output.mp4

• FFmpeg : merge 8 mono audio streams MOV file into one audio stream FLV file

  1er décembre 2015, par snucky

  I have a MOV file with eight mono audio streams, likely a 5.1 or 7.1 setup. I want to generate a for-web preview FLV file from it but in doing so lose the voices in the dialogue. FFmpeg is likely favoring an audio stream out of the eight that doesn’t have the voices. When I researched ways to merge the audio streams, in order to bring the voices back, I lose the ability to execute my ffmpeg command entirely. Here’s what I have at the moment (the introduction of the "-map 0" option rendered the command non-executable)

  /usr/local/bin/ffmpeg -i ../vmx_files/6711177.mov -map 0 -y -f flv -qmax 10
  
        -vf "scale=trunc(oh*a/2)*2:720" -ar 44100 -ab 64k assets/flv/6711177.flv
  
  
  
  
  
  ffmpeg version N-69160-g1013c15 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Jan 20 2015 09:41:10 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-11)
  
    configuration:
  
    libavutil      54. 17.100 / 54. 17.100
  
    libavcodec     56. 20.100 / 56. 20.100
  
    libavformat    56. 19.100 / 56. 19.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5.  8.100 /  5.  8.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../vmx_files/6711177.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2015-11-24 23:00:27
  
    Duration: 00:01:48.34, start: 0.000000, bitrate: 229443 kb/s
  
      Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709), 1920x1080, 220043 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 2997 tbn, 2997 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : Apple ProRes 422 (HQ)
  
        timecode        : 00:59:50;00
  
      Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:27
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:8(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-11-24 23:00:28
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:9(eng): Data: none (tmcd / 0x64636D74)
  
      Metadata:
  
        rotate          : -0
  
        creation_time   : 2015-11-24 23:03:22
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:59:50;00
  
  Data stream encoding not supported yet (only streamcopy)