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• How to record/trim/combine audio seamlessly in a React/Node web app

  16 mai 2021, par Rayhan Memon

  I've developed a digital audio workstation for the browser that you can check out here. Essentially it helps authors narrate their own audiobooks themselves at home.

  


  I'm looking to dramatically improve the speed at which audio files are combined or trimmed.

  


  Right now, the user records some variable amount of audio (a line, paragraph, or entire passage). When the user stops recording, this clip is added to the main audio file for the section using ffmpeg.wasm like so :

  


          if (duration === 0) {
            //concatenate the two files (they should already be written to memory)
            await ffmpeg.run('-i', 'concat:fullAudio.mp3|clip.mp3', '-c', 'copy', 'fullAudio.mp3');

        } else {
            //Set the insert time to wherever the user's cursor is positioned
            let insertTime = duration;
            if (selectedObj) {
                insertTime = selectedObj.endTime;
            }

            //split the audio file into two parts at the point we want to insert the audio
            await ffmpeg.run('-i', 'fullAudio.mp3', '-t', `${insertTime}`, '-c', 'copy', 'part1.mp3', '-ss',  `${insertTime}`, '-codec', 'copy', 'part2.mp3');

            //concatenate the three files
            await ffmpeg.run('-i', 'concat:part1.mp3|clip.mp3', '-acodec', 'copy', 'intermediate.mp3');
            await ffmpeg.run('-i', 'concat:intermediate.mp3|part2.mp3', '-acodec', 'copy', 'fullAudio.mp3');
        }

        //Read the result from memory
        const data = ffmpeg.FS('readFile', 'fullAudio.mp3');

        //Create URL so it can be used in the browser
        const url = URL.createObjectURL(new Blob([data.buffer], { type: 'audio/mp3' }));
        globalDispatch({ type: "setFullAudioURL", payload: url });


  


  After every recorded clip, the user is forced to wait a few seconds for this concatenation process to finish up - and the longer the main file or recorded clip gets, the longer the user has to wait. Looking at other browser-based audio editors such as AudioMass, it clearly seems possible to make a seamless recording and editing experience with zero wait time, but I can't seem to figure out how to do the same within my react app.

  


  Is it possible to seamlessly combine or trim audio data within a React app ? Is FFMPEG the best way to go about it, or are there simpler ways using pure javascript ?

  


• Unable to write textclip with moviepy due to errors with Imagemagick

  5 février, par Sato

  I am trying to write TextClip into a video with moviepy. It has always been working, yet after I reinstalled ffmpeg, it doesn't work anymore (I am not sure whether it has caused it, but I mentioned it in case it does). Some of the TextClip objects are pure spaces.

  


  I got the following error message :

  


  Traceback (most recent call last):&#xA;  File "C:\Users\USER\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\moviepy\video\VideoClip.py", line 1137, in __init__&#xA;    subprocess_call(cmd, logger=None)&#xA;  File "C:\Users\USER\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\moviepy\tools.py", line 54, in subprocess_call&#xA;    raise IOError(err.decode(&#x27;utf8&#x27;))&#xA;OSError: magick.exe: no images for write &#x27;-write&#x27; &#x27;PNG32:C:\Users\USER\AppData\Local\Temp\tmpmnf0fkb5.png&#x27; at CLI arg 14 @ error/operation.c/CLINoImageOperator/4893.&#xA;&#xA;&#xA;During handling of the above exception, another exception occurred:&#xA;&#xA;Traceback (most recent call last):&#xA;  File "media_main_user.py", line 79, in <module>&#xA;    insert_audio_and_subtitles(input_clip,&#x27;output.mp4&#x27;,&#x27;text.mp3&#x27;,subtitles,fontsize=subtitles_font_size,&#xA;  File "D:\UserData\Desktop\Project\影片剪輯\關鍵字版本\make_media.py", line 318, in insert_audio_and_subtitles&#xA;    annotated_clips = [annotate(video.subclip(from_t, to_t), txt) for (from_t, to_t), txt in subtitles]&#xA;  File "D:\UserData\Desktop\Project\影片剪輯\關鍵字版本\make_media.py", line 318, in <listcomp>&#xA;    annotated_clips = [annotate(video.subclip(from_t, to_t), txt) for (from_t, to_t), txt in subtitles]&#xA;  File "D:\UserData\Desktop\Project\影片剪輯\關鍵字版本\make_media.py", line 311, in annotate&#xA;    txtclip = TextClip(txt, fontsize=fontsize, font=font, color=txt_color)&#xA;  File "C:\Users\USER\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\moviepy\video\VideoClip.py", line 1146, in __init__&#xA;    raise IOError(error)&#xA;OSError: MoviePy Error: creation of None failed because of the following error:&#xA;&#xA;magick.exe: no images for write &#x27;-write&#x27; &#x27;PNG32:C:\Users\USER\AppData\Local\Temp\tmpmnf0fkb5.png&#x27; at CLI arg 14 @ error/operation.c/CLINoImageOperator/4893.&#xA;.&#xA;&#xA;.This error can be due to the fact that ImageMagick is not installed on your computer, or (for Windows users) that you didn&#x27;t specify the path to the ImageMagick binary in file conf.py, or that the path you specified is incorrect&#xA;</listcomp></module>

  


  I have tried to solve the problems multiple ways, like checking the config-default.py file in moviepy installation directory, and the path for ImageMagick it's pointing to is not wrong. I tried to reinstall ImageMagick, it is also of no use. And I tried to edit the policy.xml file in ImageMagick directory from none to read|write, but it also doesn't work. Can anyone suggest other possible solutions ?

  


• external-downloader option not working as expected in youtube-dl

  31 mars 2021, par Coder_H

  I was trying to download specific timestamps from youtube using youtube-dl as mentioned as mentioned here in the comments

  


  youtube-dl -v "https://www.youtube.com/watch?v=1I-3vJSC-Vo" -x -k --external-downloader ffmpeg --external-downloader-args "-ss 0:30 -to 0:35"


  


  I got the following error :

  


  [youtube] 1I-3vJSC-Vo: Downloading webpage
[download] Destination: ONE MINUTE OF PURE SATISFACTION _ Compilation 1-1I-3vJSC-Vo.f398.mp4
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/incl
ude/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable
-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libf
reetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-lib
openmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-lib
soxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal -
-enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-l
ibopencv --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incd
ir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-lad
spa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig -
-enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
--enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enabl
e-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --ena
ble-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0
r --enable-libopencv --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb
--enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Option to (record or transcode stop time) cannot be applied to input url https://r7---sn-gwpa-civk.googlevideo.com/videoplayback?exp
ire=1617150322&ei=Em1jYPnzG7qr3LUP6eGr2A0&ip=2409%3A4043%3A609%3A4b92%3Ad9f7%3Ad14%3A44f9%3A8525&id=o-AALoNXBA9D9WAuCZn-2a9-JjLoqCOC
_11Lo7_9LdU7g0&itag=398&aitags=133%2C134%2C135%2C136%2C160%2C242%2C243%2C244%2C247%2C278%2C394%2C395%2C396%2C397%2C398&source=youtub
e&requiressl=yes&mh=05&mm=31%2C29&mn=sn-gwpa-civk%2Csn-gwpa-cvhd&ms=au%2Crdu&mv=m&mvi=7&pcm2cms=yes&pl=38&initcwndbps=148750&vprv=1&
mime=video%2Fmp4&ns=_3yx5zxNR1CYgHJamv8F-s4F&gir=yes&clen=4733883&dur=59.920&lmt=1578997687942906&mt=1617128452&fvip=7&keepalive=yes
&fexp=24001373%2C24007246&beids=9466588&c=WEB&txp=5431432&n=HoSSxcQKm_nNAUWgVTbz2&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2C
requiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAN-MjT3t_kpgwkOrBiw8f-0q5iDINPxu4bjfgZS66nNGAiBOLta-kt_AuaqGH
D-hJiElj9oNALl35IsBseYOR5AU4A%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpcm2cms%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgIf334bMxslsq
Lxpnn2BATGGV6GWoWoJQQuMMgQL-NaMCICojD-uZ1VkyxIOQrfOwlLAEJ-gCe1skejtRBk-oHejU -- you are trying to apply an input option to an output
 file or vice versa. Move this option before the file it belongs to.
Error parsing options for input file https://r7---sn-gwpa-civk.googlevideo.com/videoplayback?expire=1617150322&ei=Em1jYPnzG7qr3LUP6e
Gr2A0&ip=2409%3A4043%3A609%3A4b92%3Ad9f7%3Ad14%3A44f9%3A8525&id=o-AALoNXBA9D9WAuCZn-2a9-JjLoqCOC_11Lo7_9LdU7g0&itag=398&aitags=133%2
C134%2C135%2C136%2C160%2C242%2C243%2C244%2C247%2C278%2C394%2C395%2C396%2C397%2C398&source=youtube&requiressl=yes&mh=05&mm=31%2C29&mn
=sn-gwpa-civk%2Csn-gwpa-cvhd&ms=au%2Crdu&mv=m&mvi=7&pcm2cms=yes&pl=38&initcwndbps=148750&vprv=1&mime=video%2Fmp4&ns=_3yx5zxNR1CYgHJa
mv8F-s4F&gir=yes&clen=4733883&dur=59.920&lmt=1578997687942906&mt=1617128452&fvip=7&keepalive=yes&fexp=24001373%2C24007246&beids=9466
588&c=WEB&txp=5431432&n=HoSSxcQKm_nNAUWgVTbz2&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%
2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAN-MjT3t_kpgwkOrBiw8f-0q5iDINPxu4bjfgZS66nNGAiBOLta-kt_AuaqGHD-hJiElj9oNALl35IsBseYOR5AU4A%3D%3D&
lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpcm2cms%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgIf334bMxslsqLxpnn2BATGGV6GWoWoJQQuMMgQL-NaMCICoj
D-uZ1VkyxIOQrfOwlLAEJ-gCe1skejtRBk-oHejU.
Error opening input files: Invalid argument


ERROR: ffmpeg exited with code 1



  


  Why am I facing this error despite using the same format as mentioned in the link ?