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  • Is it possible to use FFMPEG for h264 live decoding ?

    9 avril 2018, par elpha01

    I’m receiving in my C#/.NET application a H264 stream as byte arrays.
    Firstly I receive the SPS and PPS and then all NAL_units.

    I haven’t find good tools to make h264 decoding so I’m currently using FFMPEG for testing with this article as help : A Simple c# Wrapper for ffMpeg

    For the moment I write the sps and the pps in a provisory .264 file with the first NAL unit then I decode it with FFMPEG. It works for the first frame but I don’t know how I can decode the following frame. I tried to rewrite the SPS and PPS in a second file with the second NAL unit without the first one but it doesn’t work.

    How can I use FFMPEG to decode a live h264 stream when receiving NAL units.

    Thank you

  • Convert audio files to mp3 using ffmpeg [closed]

    24 mars, par Hrishikesh -Rishi- Choudhari

    I need to convert audio files to mp3 using ffmpeg.

    



    When I write the command as ffmpeg -i audio.ogg -acodec mp3 newfile.mp3, I get the error :

    



    FFmpeg version 0.5.2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: 
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 1 / 52.20. 1
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  built on Jun 24 2010 14:56:20, gcc: 4.4.1
Input #0, mp3, from 'ZHRE.mp3':
  Duration: 00:04:12.52, start: 0.000000, bitrate: 208 kb/s
    Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 256 kb/s
Output #0, mp3, to 'audio.mp3':
    Stream #0.0: Audio: 0x0000, 44100 Hz, stereo, s16, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
Unsupported codec for output stream #0.0


    



    I also ran this command :

    



     ffmpeg -formats | grep mp3


    



    and got this in response :

    



    FFmpeg version 0.5.2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: 
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 1 / 52.20. 1
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  built on Jun 24 2010 14:56:20, gcc: 4.4.1
 DE mp3             MPEG audio layer 3
 D A    mp3             MP3 (MPEG audio layer 3)
 D A    mp3adu          ADU (Application Data Unit) MP3 (MPEG audio layer 3)
 D A    mp3on4          MP3onMP4
 text2movsub remove_extra noise mov2textsub mp3decomp mp3comp mjpegadump imxdump h264_mp4toannexb dump_extra


    



    I guess that the mp3 codec isn't installed. Am I on the right track here ?

    


  • Automatic encoder selection failed Default encoder for format mp3 is probably disabled. Please choose an encoder manually.Error selecting an encoder

    27 janvier 2018, par Parimal Desai

    using ffmpeg compressing song to low quality getting error for

    "Automatic encoder selection failed for output stream #0:1. Default encoder for format mp3 (codec mp3) is probably disabled. Please choose an encoder manually. Error selecting an encoder for stream 0:1"

    ffmpeg -i /home/smubu/public_html/uploads/tracks/47865540_1999341734_1027911481.mp3 -ab 64 /home/smubu/public_html/uploads/tracks/47865540_1999341734_1027911481_comp_96.mp3
    

    
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
    
  configuration:
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
[mp3 @ 0x218e380] Estimating duration from bitrate, this may be inaccurate
    
Input #0, mp3, from '/home/smubu/public_html/uploads/tracks/47865540_1999341734_1027911481.mp3':
    
  Metadata:
    
    encoder         : LAME 32bits version 3.98.2 (http://www.mp3dev.org/)
    
    title           : Dj.Senior'B Kantinti [Club Rmx
    
    track           : 2010
    
    comment         : Downloaded from Howwe Entertainment [ www.howwe.biz ]
    
    TEXT            : 2010
    
    TLEN            : 97391548
    
    artist          : Stecia Mayanja
    
    album_artist    : www.howwe.biz
    
    composer        : www.howwe.biz
    
    album           : Howwe Entertainment
    
    genre           : www.howwe.biz
    
    date            : 2010
    
  Duration: 00:03:46.34, start: 0.000000, bitrate: 81 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 80 kb/s
    
    Stream #0:1: Video: png, rgba(pc), 600x600, 90k tbr, 90k tbn, 90k tbc
    
    Metadata:
    
      comment         : Other
    
Automatic encoder selection failed for output stream #0:1. Default encoder for format mp3 (codec mp3) is probably disabled. Please choose an encoder manually.
    
Error selecting an encoder for stream 0:1

    Help me regarding this issue

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