[FFmpeg-user] Segment sound to multiple Waveform images

[Paul B Mahol]

On 4/8/16, Bouke (VideoToolShed) <bouke at videotoolshed.com> wrote:
> Hi guys,
> Trying to split a soundfile to generate multiple audio waveform images.
>
> ffmpeg.exe -i K:\test\test.wav -f segment -segment_time 8  -filter_complex
> "aformat=channel_layouts=mono,compand,showwavespic=s=640x120" -f image2
> K:\test\test_%03d.png
>
> However, this gives me just one file, showing the entire duration of the
> sound clip. What am I missing here?

That is uses whole stream to create single output frame.

Use multiple calls with diff arg ato trim filter to do what you want.

>
> To make it slightly more complex, if this can be done, how can I make the
> last file to have the same timescale as the other ones?
> (say the file is 12 seconds, the first image would show second 0 to 8, and I
> want the second one to be as wide, but have the audio data show only in the
> first half of the image.)
>
> thx,
>
> Bouke
>
>  -- "ffmpeg version N-79253-g8005b6d Copyright (c) 2000-2016 the FFmpeg
> developers
>   built with gcc 5.3.0 (GCC)
>   configuration --enable-gpl --enable-version3 --disable-w32threads
> --enable-avisynth
>  --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
> --enable-iconv
>  --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
> --enable-libfreetype
>  --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug
> --enable-libmfx
>  --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenjpeg
>  --enable-libopus --enable-librtmp --enable-libschroedinger
> --enable-libsnappy
>  --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
> --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-decklink --enable-zlib
>   libavutil      55. 20.100 / 55. 20.100
>   libavcodec     57. 34.100 / 57. 34.100
>   libavformat    57. 30.100 / 57. 30.100
>   libavdevice    57.  0.101 / 57.  0.101
>   libavfilter     6. 40.102 /  6. 40.102
>   libswscale      4.  1.100 /  4.  1.100
>   libswresample   2.  0.101 /  2.  0.101
>   libpostproc    54.  0.100 / 54.  0.100
> Guessed Channel Layout for  Input Stream #0.0  stereo
> Input #0, wav, from 'K\test\test.wav'
>   Metadata
>     encoder          Lavf57.30.100
>   Duration 000104.08, bitrate 1536 kb/s
>     Stream #00 Audio pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2
> channels, s16, 1536 kb/s
> Output #0, image2, to 'K\test\test_%03d.png'
>   Metadata
>     encoder          Lavf57.30.100
>     Stream #00 Video png, rgba, 640x120 [SAR 11 DAR 163], q=2-31, 200 kb/s,
> 75 fps, 75 tbn, 75 tbc
>     Metadata
>       encoder          Lavc57.34.100 png
> Stream mapping
>   Stream #00 (pcm_s16le) -> aformat
>   showwavespic -> Stream #00 (png)
> Press [q] to stop, [?] for help
> frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=000000.01 bitrate=N/A
> speed=0.0452x
> video12kB audio0kB subtitle0kB other streams0kB global headers0kB muxing
> overhead unknown
>
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>