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• ffmpeg not recognize audio file

  26 janvier 2021, par M Taher

  i have these flv files that exported from adobe connect and i want to extarct their audio files with ffmpeg , ffmpeg do not recognize some of their audio files 
this log is from 1 file that has issue :

  



  >ffmpeg.exe -i r7anupl75gl_0_1965937.flv test1.mp3
ffmpeg version N-76123-g002b049 Copyright (c) 2000-2015 the FFmpeg                                                                      
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads                    
libavutil      55.  4.100 / 55.  4.100
libavcodec     57.  7.100 / 57.  7.100
libavformat    57.  8.102 / 57.  8.102
libavdevice    57.  0.100 / 57.  0.100
libavfilter     6. 11.100 /  6. 11.100
libswscale      4.  0.100 /  4.  0.100
libswresample   2.  0.100 /  2.  0.100
libpostproc    54.  0.100 / 54.  0.100
[flv @ 0000000000522140] Could not find codec parameters for stream 1        

(Audio: none, 0 channels): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize'   
options
Input #0, flv, from 'r7anupl75gl_0_1965937.flv':
Metadata:
lasttimestamp   : 5026
lastkeyframetimestamp: 5022
audiodelay      : 0
canSeekToEnd    : false
creationdate    : unknown
metadatacreator : Manitu Group FLV MetaData Injector 2
videosize       : 251586025
audiosize       : 55776880
datasize        : 516
Duration: 01:23:47.75, start: 0.000000, bitrate: 489 kb/s
Stream #0:0: Video: vp6f, yuv420p, 1184x704, 1k tbr, 1k tbn, 1k tbc
Stream #0:1: Audio: none, 0 channels
Output #0, mp3, to 'test1.mp3':
Output file #0 does not contain any stream


  



  note : audio codec is nellymoser and in some files convert works successfuly

  


• creation of video file with alpha channel/transparency

  3 décembre 2015, par boerfi

  I’m experimenting with a video file with alpha channel.
  Later on the file should be an overlay for another video. It will be merged with another file in real time and saved to another file. But that is not the important point. The problem starts earlier because I can’t even play it.

  The video is a png-encoded Quicktime-file which I cannot play with any video player. WMP, VLC, MPC and ffplay all show various problems which all lead to the problem that the images seem to get decoded too slowly.
  The strange thing is that neither cpu (i7) nor my ssd are on limit but the file isn’t played correctly.

  Since the problem appears with all players I think it’s based on using png in video. I googled but didn’t find a proper way to create a partly transparent video file.
  I tried various methods of exporting (with adobe media encoder) with no result : the file lost its transparency or is running too slow.

  The resulting file which I create with my SDK is correct (video and audio are synchronous and fluid) but it takes 1 minute to render a video of 40 seconds although it works in real time with files without transparency.

  Does anyone know what kind of file I should export that has a minimum resolution of 720p, that is partly transparent and that can be played with ffplay in real time ?
  I would also appreciate any experiences with partly transparent videos which could help me because I couldn’t find any helpful links ?

  Thanks,
  Marius

• ffmpeg does not recognize audio stream in video

  13 février 2021, par M Taher

  I have these flv files that exported from Adobe Connect and I want to extract their audio with ffmpeg. ffmpeg does not recognize the audio on some of them. This log is from one file that has issues :

  


  >ffmpeg.exe -i r7anupl75gl_0_1965937.flv test1.mp3
ffmpeg version N-76123-g002b049 Copyright (c) 2000-2015 the FFmpeg                                                                      
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads                    
libavutil      55.  4.100 / 55.  4.100
libavcodec     57.  7.100 / 57.  7.100
libavformat    57.  8.102 / 57.  8.102
libavdevice    57.  0.100 / 57.  0.100
libavfilter     6. 11.100 /  6. 11.100
libswscale      4.  0.100 /  4.  0.100
libswresample   2.  0.100 /  2.  0.100
libpostproc    54.  0.100 / 54.  0.100
[flv @ 0000000000522140] Could not find codec parameters for stream 1        

(Audio: none, 0 channels): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize'   
options
Input #0, flv, from 'r7anupl75gl_0_1965937.flv':
Metadata:
lasttimestamp   : 5026
lastkeyframetimestamp: 5022
audiodelay      : 0
canSeekToEnd    : false
creationdate    : unknown
metadatacreator : Manitu Group FLV MetaData Injector 2
videosize       : 251586025
audiosize       : 55776880
datasize        : 516
Duration: 01:23:47.75, start: 0.000000, bitrate: 489 kb/s
Stream #0:0: Video: vp6f, yuv420p, 1184x704, 1k tbr, 1k tbn, 1k tbc
Stream #0:1: Audio: none, 0 channels
Output #0, mp3, to 'test1.mp3':
Output file #0 does not contain any stream


  


  Note : audio codec is Nellymoser Asao and this command works successfully for some files.