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• command line settings for audio equalizer ffmpeg sox

  9 novembre 2016, par user1320370

  I need to add an equalizer effect on some flac files :

  f=4043, 1.65q, g=9.5; f=7024, 1.09q, g=3.7; f=9254, 0.94q, g=-2.5

  I have tried ffmpeg :

  ffmpeg -i solovoce_compress.flac -af equalizer=f=4043:width_type=q:w=1.65:g=9.5, equalizer=f=7024:width_type=q:w=1.09:g=3.7,equalizer=f=9254:width_type=q:w=0.94:g=-2.5 solovoce_equalizzato.flac

  but the result different to what I expect. These values were calculated by izotope ozone (professional audio editor software) and tested.

  I used the equivalent with sox and the result is the same.

  At this point I would like to try ffmpeg ’anequalizer’ filter that shows the graph so I can ’see’ the difference, but the documentation to show the graph is not clear and I have not found anything about it on the web.

  Can someone can please give me an example of how to use ’anequalizer’ with the plot enabled ?

• ffmpeg playback on android

  11 avril 2012, par Sasha

  I managed to compile ffmpeg libs for Android and i am able to load them in my jni Android app. Now started calling the ffmpeg functions and following the online tutorials. I read there that I need also SDL port for Android in order to render audio/video.

  I have looked at libsdl and it seems quite complex to use on Android, especially since I just need sequential render of audio/video media samples, is there some simpler solution (with examples) how to render the decoded buffers ? Should I pass decoded media buffers from frrmpeg back to java for rendering ?

  If I have to use SDL, is there some tutorial how to easy integrate it on Android with ffmpeg ?

• FFmpeg live stream with intermediate files

  11 juillet 2021, par SANA NE

  right now i am taking a live stream with rtmpdump and sending it to ffmpeg than nginx to serve as m3u8. This rtmpdump sometimes fails mid stream and need to be restarted which i do automatically but that takes about 10-15 seconds. During that time ffmpeg stops sending data to nginx so end users stream cuts with error. I am looking for a way to make this fully continuous so end users dont get disconnected.

  


  I am a totaly newbie on ffmpeg and streaming so if you know a better way please tell me but what i think about doing is creating a named pipe where main ffmpeg constantly listens and sends data to nginx. When the stream is started i will start sending loading.mp4 to that pipe and when i recieve rtmpdump data i will stop it and send rtmpdump, when rtmpdump fails i will start sending loading.mp4 data instantly so basically there will be no down time on the stream, at least i hope there wont be. Like i said i am a total newbie on streaming but looking as a programmer i think this method should work...

  


  Right now i am trying to tinker the code with options i am looking from online documents, there might be totally unnecessary options i am using...

  


  mkfifo /var/streams/test
ffmpeg -re \
    -f live_flv -fflags +igndts -fflags flush_packets -fflags discardcorrupt \
    -y -i "/var/streams/test" -c:v copy -map 0:0 -c:a copy -map 0:1? \
    -fflags +genpts -frame_drop_threshold 1.0 -preset ultrafast \
    -f flv -flvflags no_duration_filesize "rtmp://localhost:12345/hls/test" \
    -async 1 -vsync 2


  


  when i run this command main ffmpeg starts listening on the pipe, then i run

  


  ffmpeg -y -re -stream_loop -1 -i "/var/updating.mp4" -c:v copy -map 0:0 -c:a copy -map 0:1? \ 
-f flv -flvflags no_duration_filesize "/var/streams/test"


  


  to here it all works perfectly and starts sending data to pipe which than gets sent to nginx and i can view on VLC, my problem start right here... When i stop the second ffmpeg instance which is sending updating.mp4 and restart it main ffmpeg instance throws "[live_flv @ 0x558799fe0f80] Packet mismatch " error, this is the same exact video that i started sending so codecs and all other things are the same. I tried looking online for "packet mismatch" error but couldnt find a solution...

  


  Can someone tell me what i am doing wrong here ?