I have observed that when playing back the waveform in certain audio players, the sound is routed only to the left speaker. This issue seems to occur when the player relies on the speaker channel mapping embedded in the audio file. Despite the audio file being mono, the playback is incorrectly mapped to a single speaker (left) rather than both speakers, resulting in no sound from the right speaker.
ffprobe .\musicgpt-generated.wav
ffprobe version 7.1-full_build-www.gyan.dev Copyright (c) 2007-2024 the FFmpeg developers
built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 59. 39.100 / 59. 39.100
libavcodec 61. 19.100 / 61. 19.100
libavformat 61. 7.100 / 61. 7.100
libavdevice 61. 3.100 / 61. 3.100
libavfilter 10. 4.100 / 10. 4.100
libswscale 8. 3.100 / 8. 3.100
libswresample 5. 3.100 / 5. 3.100
libpostproc 58. 3.100 / 58. 3.100
Input #0, wav, from '.\musicgpt-generated.wav':
Duration: 00:00:09.94, bitrate: 1024 kb/s
Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 32000 Hz, 1 channels (FL), flt, 1024 kb/s
diff --git "a/.\\ffprobe-fl.txt" "b/.\\ffprobe-mono.txt"
index 3bdcb7a..a191f71 100644
--- "a/.\\ffprobe-fl.txt"
+++ "b/.\\ffprobe-mono.txt"
@@ -1,4 +1,4 @@
-ffprobe .\musicgpt-generated.wav
+ffprobe .\output_mono.wav
ffprobe version 7.1-full_build-www.gyan.dev Copyright (c) 2007-2024 the FFmpeg developers
built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
@@ -10,6 +10,8 @@ ffprobe version 7.1-full_build-www.gyan.dev Copyright (c) 2007-2024 the FFmpeg d
libswscale 8. 3.100 / 8. 3.100
libswresample 5. 3.100 / 5. 3.100
libpostproc 58. 3.100 / 58. 3.100
-Input #0, wav, from '.\musicgpt-generated.wav':
+Input #0, wav, from '.\output_mono.wav':
+ Metadata:
+ encoder : Lavf61.7.100
Duration: 00:00:09.94, bitrate: 1024 kb/s
- Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 32000 Hz, 1 channels (FL), flt, 1024 kb/s
\ No newline at end of file
+ Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 32000 Hz, 1 channels, flt, 1024 kb/s
\ No newline at end of file
I have observed that when playing back the waveform in certain audio players, the sound is routed only to the left speaker. This issue seems to occur when the player relies on the speaker channel mapping embedded in the audio file. Despite the audio file being mono, the playback is incorrectly mapped to a single speaker (left) rather than both speakers, resulting in no sound from the right speaker.