MP4 to PNG: output%d.png: Invalid argument, How can I edit the Makefile to enable PNG output?

I encountered an issue when converting an MP4 video to PNG frames (output%d.png: Invalid argument). How can I edit the Makefile to enable PNG output? Here's my code: ``` const result = ffmpeg({ MEMFS: [{name: "demo.mp4", data: testData}], arguments: ['-i', 'demo.mp4', 'output%d.png'], printErr: function(data) { console.error(data); }, }) ``` The specific error message is as follows: ``` ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers built with emcc (Emscripten gcc/clang-like replacement) 1.39.11 configuration: --cc=emcc --ranlib=emranlib --enable-cross-compile --target-os=none --arch=x86 --disable-runtime-cpudetect --disable-asm --disable-fast-unaligned --disable-pthreads --disable-w32threads --disable-os2threads --disable-debug --disable-stripping --disable-safe-bitstream-reader --disable-all --enable-ffmpeg --enable-avcodec --enable-avformat --enable-avfilter --enable-swresample --enable-swscale --disable-network --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vdpau --enable-decoder=vp8 --enable-decoder=h264 --enable-decoder=vorbis --enable-decoder=opus --enable-decoder=mp3 --enable-decoder=aac --enable-decoder=pcm_s16le --enable-decoder=mjpeg --enable-decoder=png --enable-demuxer=matroska --enable-demuxer=ogg --enable-demuxer=mov --enable-demuxer=mp3 --enable-demuxer=wav --enable-demuxer=image2 --enable-demuxer=concat --enable-protocol=file --enable-filter=aresample --enable-filter=scale --enable-filter=crop --enable-filter=overlay --enable-filter=hstack --enable-filter=vstack --disable-bzlib --disable-iconv --disable-libxcb --disable-lzma --disable-sdl2 --disable-securetransport --disable-xlib --enable-zlib --enable-encoder=libvpx_vp8 --enable-encoder=libopus --enable-muxer=webm --enable-muxer=ogg --enable-muxer=null --enable-libopus --enable-libvpx --extra-cflags='-s USE_ZLIB=1 -I../libvpx/dist/include' --extra-ldflags=-L../libvpx/dist/lib libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavfilter 7. 57.100 / 7. 57.100 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 [aac @ 0x6a9470] Warning: not compiled with thread support, using thread emulation [h264 @ 0x6af390] Warning: not compiled with thread support, using thread emulation Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'demo.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 comment : vid:v0300fg10000ci2umlrc77u6bl3ua4r0 encoder : Lavf58.76.100 Duration: 00:01:02.93, start: 0.000000, bitrate: 2027 kb/s Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : SoundHandler Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x1280 [SAR 1:1 DAR 9:16], 1891 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : VideoHandler [NULL @ 0x6c4f40] Unable to find a suitable output format for 'output%d.png' output%d.png: Invalid argument ``` I followed this [issue](https://github.com/https://github.com/Kagami/ffmpeg.js/issues/150#issuecomment-761883575) and removed the `--disable-all `option, which resolved the issue. However, the resulting .js file size increased to 30MB. What modifications should I make to the Makefile configuration to reduce the compiled JS file size while still enabling PNG output?