I played around with batch commands offered and parial success with this:

for %%F in (*.mp3) do ffmpeg -y -i "%%F" -filter:a "volume=1.5" "%%~dF%%~pF%%~n1.mp3"
pause

I tried this with just 2 mp3 files, which I could see were being processed when I ran the batch file, but there is only one processed file appearing in the same folder as %~n1.mp3.

The command is lacking something!! Both mp3 files are aprox 13-14000kb but the processed file %~n1.mp3 is only 5500kb, and the second one seems to overwrite the first! How do I need to change the command in order to dump both processed files into a sub-folder called newmp3?


The text appearing on the cmd screen is:


C:\Users\Windows User\a_his stuff\MP3\Newfolder>for %F in (*.mp3) do ffmpeg -y -
i "%F" -filter:a "volume=1.5" "%~dF%~pF%~n1.mp3"

C:\Users\Windows User\a_his stuff\MP3\Newfolder>ffmpeg -y -i "%newfolder%~n1.mp3
" -filter:a "volume=1.5" "C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.m
p3"
ffmpeg version N-87130-g2b9fd15 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.1.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
-enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil      55. 74.100 / 55. 74.100
libavcodec    57.104.100 / 57.104.100
libavformat    57. 79.100 / 57. 79.100
libavdevice    57. 8.100 / 57. 8.100
libavfilter    6.101.100 / 6.101.100
libswscale      4. 7.103 / 4. 7.103
libswresample   2. 8.100 / 2. 8.100
libpostproc    54. 6.100 / 54. 6.100
Input #0, mp3, from '%newfolder%~n1.mp3':
Metadata:
    title          : Only Wanna Be With You
    artist          : Darius Rucker
    album          : Audience recording from Delawa
    date            : 2017
    track          : 2
    genre          : Country
    encoder         : Lavf57.79.100
Duration: 00:00:01.65, start: 0.025057, bitrate: 129 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    Metadata:
      encoder         : Lavc57.10
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.mp3':
Metadata:
    TIT2            : Only Wanna Be With You
    TPE1            : Darius Rucker
    TALB            : Audience recording from Delawa
    TDRC            : 2017
    TRCK            : 2
    TCON            : Country
    TSSE            : Lavf57.79.100
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc57.104.100 libmp3lame
[libmp3lame @ 04321080] Trying to remove 1152 samples, but the queue is empty
size=      26kB time=00:00:01.61 bitrate= 132.0kbits/s speed=8.65x
video:0kB audio:26kB subtitle:0kB other streams:0kB global headers:0kB muxing ov
erhead: 1.526718%

C:\Users\Windows User\a_his stuff\MP3\Newfolder>ffmpeg -y -i "%~n1.mp3" -filter:
a "volume=1.5" "C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.mp3"
ffmpeg version N-87130-g2b9fd15 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.1.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
-enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil      55. 74.100 / 55. 74.100
libavcodec    57.104.100 / 57.104.100
libavformat    57. 79.100 / 57. 79.100
libavdevice    57. 8.100 / 57. 8.100
libavfilter    6.101.100 / 6.101.100
libswscale      4. 7.103 / 4. 7.103
libswresample   2. 8.100 / 2. 8.100
libpostproc    54. 6.100 / 54. 6.100
Input #0, mp3, from '%~n1.mp3':
Metadata:
    title          : Only Wanna Be With You
    artist          : Darius Rucker
    album          : Audience recording from Delawa
    date            : 2017
    track          : 2
    genre          : Country
    encoder         : Lavf57.79.100
Duration: 00:00:01.65, start: 0.025057, bitrate: 129 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    Metadata:
      encoder         : Lavc57.10
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.mp3':
Metadata:
    TIT2            : Only Wanna Be With You
    TPE1            : Darius Rucker
    TALB            : Audience recording from Delawa
    TDRC            : 2017
    TRCK            : 2
    TCON            : Country
    TSSE            : Lavf57.79.100
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc57.104.100 libmp3lame
[libmp3lame @ 0403f620] Trying to remove 1152 samples, but the queue is empty
size=      26kB time=00:00:01.61 bitrate= 132.0kbits/s speed=7.89x
video:0kB audio:26kB subtitle:0kB other streams:0kB global headers:0kB muxing ov
erhead: 1.526718%

C:\Users\Windows User\a_his stuff\MP3\Newfolder>ffmpeg -y -i ".mp3" -filter:a "v
olume=1.5" "C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.mp3"
ffmpeg version N-87130-g2b9fd15 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.1.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
-enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil      55. 74.100 / 55. 74.100
libavcodec    57.104.100 / 57.104.100
libavformat    57. 79.100 / 57. 79.100
libavdevice    57. 8.100 / 57. 8.100
libavfilter    6.101.100 / 6.101.100
libswscale      4. 7.103 / 4. 7.103
libswresample   2. 8.100 / 2. 8.100
libpostproc    54. 6.100 / 54. 6.100
Input #0, mp3, from '.mp3':
Metadata:
    title          : Only Wanna Be With You
    artist          : Darius Rucker
    album          : Audience recording from Delawa
    date            : 2017
    track          : 2
    genre          : Country
    encoder         : Lavf57.79.100
Duration: 00:00:01.65, start: 0.025057, bitrate: 129 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    Metadata:
      encoder         : Lavc57.10
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.mp3':
Metadata:
    TIT2            : Only Wanna Be With You
    TPE1            : Darius Rucker
    TALB            : Audience recording from Delawa
    TDRC            : 2017
    TRCK            : 2
    TCON            : Country
    TSSE            : Lavf57.79.100
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc57.104.100 libmp3lame
[libmp3lame @ 040dfbe0] Trying to remove 1152 samples, but the queue is empty
size=      26kB time=00:00:01.61 bitrate= 132.0kbits/s speed=8.65x
video:0kB audio:26kB subtitle:0kB other streams:0kB global headers:0kB muxing ov
erhead: 1.526718%

C:\Users\Windows User\a_his stuff\MP3\Newfolder>ffmpeg -y -i "01 - Homegrown Hon
ey.mp3" -filter:a "volume=1.5" "C:\Users\Windows User\a_his stuff\MP3\Newfolder\
%~n1.mp3"
ffmpeg version N-87130-g2b9fd15 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.1.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
-enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil      55. 74.100 / 55. 74.100
libavcodec    57.104.100 / 57.104.100
libavformat    57. 79.100 / 57. 79.100
libavdevice    57. 8.100 / 57. 8.100
libavfilter    6.101.100 / 6.101.100
libswscale      4. 7.103 / 4. 7.103
libswresample   2. 8.100 / 2. 8.100
libpostproc    54. 6.100 / 54. 6.100
Input #0, mp3, from '01 - Homegrown Honey.mp3':
Metadata:
    title          : Homegrown Honey
    artist          : Darius Rucker
    album          : Audience recording from Delawa
    date            : 2017
    track          : 1
    genre          : Country
Duration: 00:05:44.87, start: 0.025057, bitrate: 320 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.mp3':
Metadata:
    TIT2            : Homegrown Honey
    TPE1            : Darius Rucker
    TALB            : Audience recording from Delawa
    TDRC            : 2017
    TRCK            : 1
    TCON            : Country
    TSSE            : Lavf57.79.100
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc57.104.100 libmp3lame
[mp3 @ 0342c720] Header missing3 bitrate= 122.7kbits/s speed=11.5x
Error while decoding stream #0:0: Invalid data found when processing input
size=    5389kB time=00:05:44.84 bitrate= 128.0kbits/s speed=11.5x
video:0kB audio:5389kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 0.007159%

C:\Users\Windows User\a_his stuff\MP3\Newfolder>ffmpeg -y -i "03 - Only Wanna Be
With You.mp3" -filter:a "volume=1.5" "C:\Users\Windows User\a_his stuff\MP3\New
folder\%~n1.mp3"
ffmpeg version N-87130-g2b9fd15 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.1.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
-enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil      55. 74.100 / 55. 74.100
libavcodec    57.104.100 / 57.104.100
libavformat    57. 79.100 / 57. 79.100
libavdevice    57. 8.100 / 57. 8.100
libavfilter    6.101.100 / 6.101.100
libswscale      4. 7.103 / 4. 7.103
libswresample   2. 8.100 / 2. 8.100
libpostproc    54. 6.100 / 54. 6.100
Input #0, mp3, from '03 - Only Wanna Be With You.mp3':
Metadata:
    title          : Only Wanna Be With You
    artist          : Darius Rucker
    album          : Audience recording from Delawa
    date            : 2017
    track          : 2
    genre          : Country
Duration: 00:05:58.16, start: 0.025057, bitrate: 320 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'C:\Users\Windows User\a_his stuff\MP3\Newfolder\%~n1.mp3':
Metadata:
    TIT2            : Only Wanna Be With You
    TPE1            : Darius Rucker
    TALB            : Audience recording from Delawa
    TDRC            : 2017
    TRCK            : 2
    TCON            : Country
    TSSE            : Lavf57.79.100
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc57.104.100 libmp3lame
[mp3 @ 0412c760] Header missing9 bitrate= 124.9kbits/s speed=11.5x
Error while decoding stream #0:0: Invalid data found when processing input
size=    5596kB time=00:05:58.11 bitrate= 128.0kbits/s speed=11.4x
video:0kB audio:5596kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 0.007015%

C:\Users\Windows User\a_his stuff\MP3\Newfolder>pause
Press any key to continue . . .

The command is lacking something!! Both mp3 files are aprox 13-14000kb but the processed file %~n1.mp3 is only 5500kb