[SOLVED] avidemux: crop and increase sound volume

porphyry5 · 07-18-2017, 09:44 AM

This is my first use of avidemux. I have a .mp4 with 2 problems, video needs an irritating border cropped throughout, and the sound is barely audible at full volume setting.

Did the crop successfully with avidemux gui, but that seems to offer no way to increase sound volume (which I believe requires normalizing), so I cobbled together this command line from googling 'avidemux normalize'

Code:

avidemux3_cli --audio-process --audio-normalize --audio-resample 44100 --audio-codec MP3  --audio-bitrate 128 --video-codec X264  --output-format MP4 Muxer --force-alt-h264 --load WhiteDog_edit.mp4 --save WD.mp4 --quit

which produced a file that will not play, vlc having this to say about it

Quote:

[096be080] pulse audio output error: PulseAudio server connection failure: Connection refused
[09627930] core libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xb562ad80] moov atom not found
[096ed0d0] skins2 interface error: no suitable dialogs provider found (hint: compile the qt4 plugin, and make sure it is loaded properly)
[096ed0d0] skins2 interface error: cannot instantiate qt4 dialogs provider
[096ed0d0] [cli] lua interface: Listening on host "*console".
VLC media player 2.2.4 Weatherwax
Command Line Interface initialized. Type `help' for help.
> [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb412c860] moov atom not found
[b4124430] avformat demux error: Could not open /home/q/WD.mp4: Unknown error 1094995529
[b415eee0] core demux error: option sub-original-fps does not exist
[b1800510] core input error: no suitable demux module for `file/subtitle:///home/q//wd.txt'
[b415ee70] core demux error: option sub-original-fps does not exist
[b1800510] core input error: demux doesn't like DEMUX_GET_TIME
... 6000+ times
[b1800510] core input error: demux doesn't like DEMUX_GET_TIME
[096ed0d0] [cli] lua interface error: Error loading script /usr/lib/vlc/lua/intf/cli.luac: lua/intf/modules/host.lua:279: Interrupted.

Advice please

porphyry5 · 07-19-2017, 05:45 AM

Using the cropped file I earlier produced with avidemux as input, I did
Extract video only with (%f is mc code for the file-name)

Code:

ffmpeg -i %f -vcodec copy -an v.mp4

Extract audio to audiodump.wav

Code:

mplayer %f -benchmark -vc null -vo null -ao pcm:fast >& /dev/null

Increase the volume

Code:

sox -v 3.0 audiodump.wav a.wav

audiodump.wav is huge (as large, or more than the movie), so reencode a.wav

Code:

lame -V2 a.wav a.mp3

Merge video and audio back together

Code:

ffmpeg -i v.mp4 -i a.mp3 -c copy m.mp4

And, of course, one can always find a better solution, a single ffmpeg command does it all. Again %f is the cropped file out of avidemux.

Code:

ffmpeg -i %f -c:v copy -c:a copy -vol 256 m.mp4