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  • What is the relationship among FFmpeg, librtmp and rtmpdump ?

    2 septembre 2021, par yanzhang.guo

    I am a beginner of FFmpeg. I can see that video can be pushed to an RTMP server by FFmpeg or librtmp on the Internet. But I also see that when compiling FFmpeg, I need to add option enable-librtmp. Are they parallel or inclusive ? What is rtmpdump ? Does the libtrmp API use RTMP lower-level functions directly ?

    


  • FFmpeg cannot recognize a preset even though it does exist Ubuntu 12.04

    6 septembre 2017, par Ahmad Tahboub

    I have installed ffmpeg and x264 folloowing the steps in this documentation :http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide

    Now I have this line to execute :

    sudo /usr/bin/ffmpeg -i input_file.flv -f flv -vcodec libx264 -vpre normal -r 25 -s 0x0 -aspect 1.7777777777778 -padcolor 000000 -padtop 0 -padbottom 0 -padleft 0 -padright 0 -acodec libfaac -ab 128000 -ar 22050 output_file.flv
    

    
Input #0, flv, from 'WIN! Jwow.flv':
    
  Metadata:
    
    starttime       : 0
    
    totalduration   : 101
    
    totaldatarate   : 865
    
    bytelength      : 10897460
    
    canseekontime   : true
    
    sourcedata      : BD58B2E43HH1338284027987695
    
    purl            : 
    
    pmsg            : 
    
  Duration: 00:01:40.66, start: 0.000000, bitrate: 877 kb/s
    
    Stream #0.0: Video: h264 (Main), yuv420p, 640x360, 745 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
    
    Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 131 kb/s
    
**File for preset 'normal' not found**

    I have the presets in the the following directories :

    /usr/share/ffmpeg
    
/usr/local/share/ffmpeg
    
/home/user/.ffmpeg
    
/usr/local/src/ffmpeg/presets

    And still getting the same error : File for preset ’normal’ not found

    What is the problem here ?

    Extra info - this is what i get when i do ffmpeg -version

    ffmpeg version git-2012-05-31-60de761
    
built on May 31 2012 15:54:11 with gcc 4.6.3
    
configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab

  • FFmpeg cannot recognize a preset even though it does exist Ubuntu 12.04

    6 septembre 2017, par Ahmad Tahboub

    I have installed ffmpeg and x264 folloowing the steps in this documentation :http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide

    Now I have this line to execute :

    sudo /usr/bin/ffmpeg -i input_file.flv -f flv -vcodec libx264 -vpre normal -r 25 -s 0x0 -aspect 1.7777777777778 -padcolor 000000 -padtop 0 -padbottom 0 -padleft 0 -padright 0 -acodec libfaac -ab 128000 -ar 22050 output_file.flv
    

    
Input #0, flv, from 'WIN! Jwow.flv':
    
  Metadata:
    
    starttime       : 0
    
    totalduration   : 101
    
    totaldatarate   : 865
    
    bytelength      : 10897460
    
    canseekontime   : true
    
    sourcedata      : BD58B2E43HH1338284027987695
    
    purl            : 
    
    pmsg            : 
    
  Duration: 00:01:40.66, start: 0.000000, bitrate: 877 kb/s
    
    Stream #0.0: Video: h264 (Main), yuv420p, 640x360, 745 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
    
    Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 131 kb/s
    
**File for preset 'normal' not found**

    I have the presets in the the following directories :

    /usr/share/ffmpeg
    
/usr/local/share/ffmpeg
    
/home/user/.ffmpeg
    
/usr/local/src/ffmpeg/presets

    And still getting the same error : File for preset ’normal’ not found

    What is the problem here ?

    Extra info - this is what i get when i do ffmpeg -version

    ffmpeg version git-2012-05-31-60de761
    
built on May 31 2012 15:54:11 with gcc 4.6.3
    
configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab

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