How to Increase Audio Level (Volume), Once Extracted - ?

[elling]

I have a .wmv video that plays normally at a moderate level (call it a 5 on a scale of 1-10 in home theater DVD player terms) for the first 45 seconds and then it decreases to around 1-2 for the remaining 5 minutes. My goal is to play the video on my home theater DVR's HDD without manually increasing the volume by roughly 45%. It seems that extracting or ripping the audio will be no problem (please recommend program(s) for a newbie) but I'm not sure about increasing the volume. Thank you!

[redwudz]

Audacity would be my first choice. Easy to use and may be able to extract your audio directly. .wmv format could be a problem to work with.

[pandy]

You may try to recode wmv video (somehow limited popularity codec) to something more popular and apply dynaudnorm filter that will prevent large level difference across stream.

[jagabo]

Audacity is not able to extract the audio from a video file unless you add the ffmpeg source plugin.

http://manual.audacityteam.org/man/faq_installation_and_plug_ins.html#How_do_I_downloa...ort_Library.3F

Once you have imported the audio, mark the low volume section and use Effect -> Amplify to increase its volume. Then use File -> Export Audio to save the result.

Then you'll need to mux the video from the original file with the new audio with an appropriate muxing tool.

[elling]

You may try to recode wmv video (somehow limited popularity codec) to something more popular and apply dynaudnorm filter that will prevent large level difference across stream.

I will first recode it to AVI, then try Audacity. Thanks for the tips

[pandy]

You may try to recode wmv video (somehow limited popularity codec) to something more popular and apply dynaudnorm filter that will prevent large level difference across stream.

I will first recode it to AVI, then try Audacity. Thanks for the tips

If you use windows then bellow script should work - modified one of my scripts, tested and seem to be OK. AVI is not the best container but... you can try mp4 or mkv - not sure about limitations of your environment.

@setlocal
@set /a cput=(%NUMBER_OF_PROCESSORS%*3)/2
@SET x264opts="crf=22:vbv_maxrate=20000:vbv_bufsize=20000:qpmin=4:qpmax=69:level=4.0:keyint=250:cabac=1:threads=auto:sliced_threads=0:slices=-1:no_psnr=1:no_ssim=1:bluray_compat=1:open-gop=0:pic_struct=1:aud=1:nal_hrd=vbr:force_cfr=1:colorprim=bt709:transfer=bt709:colormatrix=bt709"
@if not exist %cd%\out (mkdir %cd%\out)
@ffmpeg -y -threads %cput% -hide_banner -loglevel 32 -stats -avoid_negative_ts 1 -i %1 -c:v libx264 -preset slow -profile:v high -level:v 4.0 -x264opts %x264opts% -x264-params %x264opts% -vf colormatrix=bt601:bt709 -c:a libmp3lame -q:a 4.5 -af "pan=stereo|FL < FL + 1.414FC + .5BL + .5SL|FR < FR + 1.414FC + .5BR + .5SR,aresample=resampler=soxr:osr=48000:dither_method=0,dynaudnorm=p=1/sqrt(2):m=100,firequalizer=gain='if(gte(f,24),0,-INF)+if(lte(f,15999),0,-INF)':accuracy=1:fixed=on" -f avi "out\%~n1.avi"
@Pause