Hello DopeLabs-san, Thanks for your reply.
> 2017/01/31 午後8:41、DopeLabs <dopel...@dubstep.fm>のメール:
>
> In your earlier console output for both commands...
>
>>> size= 2344kB time=00:05:00.01 bitrate= 64.0kbits/s speed= 128x
>
>>> size= 2344kB time=00:05:00.01 bitrate= 64.0kbits/s speed= 134x
>
> What method are you using to 'verify' the length?
I used macOS's FInder, Windows10's explorer, Windows10's groove music, macOS's
iTunes, Windows10's sinkusuperlite, mediainfo, and mpg123. Then macOS's iTunes
and mpg123 show correct length. Also, mediainfo does not show duration for "$
ffmpeg -f lavfi -i sine=d=300 duration_VBR.mp3 command".
> What is the ffprobe output for each of those files?
With $ ffmpeg -f lavfi -i sine=d=300 duration_VBR.mp3 command:
$ ffprobe -i duration_VBR.mp3
ffprobe version N-83152-gf7e9275 Copyright (c) 2007-2017 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/Volumes/ffmpeg_compile --pkg-config-flags=--static
--disable-ffserver --enable-gpl --enable-version3 --enable-nonfree
--enable-libmp3lame --enable-libfdk-aac --enable-libvo-amrwbenc
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvorbis
--enable-libspeex --enable-libopus --enable-libgsm --enable-libtwolame
--enable-libsoxr --enable-libwavpack --enable-libmodplug --enable-libopenjpeg
--enable-libwebp --enable-libtheora --enable-libx264 --enable-libopenh264
--enable-libx265 --enable-libxvid --enable-libvpx --enable-libxavs
--enable-libfreetype --enable-fontconfig --enable-libfribidi --enable-libass
--enable-libbluray --enable-libvidstab --enable-libschroedinger
--enable-libsnappy --enable-libzmq
libavutil 55. 43.100 / 55. 43.100
libavcodec 57. 74.100 / 57. 74.100
libavformat 57. 62.100 / 57. 62.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, mp3, from 'duration_VBR.mp3':
Metadata:
encoder : Lavf57.62.100
Duration: 00:05:00.04, start: 0.025057, bitrate: 64 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
With $ ffmpeg -f lavfi -i sine=d=300 -write_xing 0 duration.mp3 command:
$ ffprobe -i duration_CBR.mp3
ffprobe version N-83152-gf7e9275 Copyright (c) 2007-2017 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/Volumes/ffmpeg_compile --pkg-config-flags=--static
--disable-ffserver --enable-gpl --enable-version3 --enable-nonfree
--enable-libmp3lame --enable-libfdk-aac --enable-libvo-amrwbenc
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvorbis
--enable-libspeex --enable-libopus --enable-libgsm --enable-libtwolame
--enable-libsoxr --enable-libwavpack --enable-libmodplug --enable-libopenjpeg
--enable-libwebp --enable-libtheora --enable-libx264 --enable-libopenh264
--enable-libx265 --enable-libxvid --enable-libvpx --enable-libxavs
--enable-libfreetype --enable-fontconfig --enable-libfribidi --enable-libass
--enable-libbluray --enable-libvidstab --enable-libschroedinger
--enable-libsnappy --enable-libzmq
libavutil 55. 43.100 / 55. 43.100
libavcodec 57. 74.100 / 57. 74.100
libavformat 57. 62.100 / 57. 62.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
[mp3 @ 0x7fa2fc804e00] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'duration_CBR.mp3':
Metadata:
encoder : Lavf57.62.100
Duration: 00:05:00.04, start: 0.000000, bitrate: 64 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
Best Regards,
// Miya aka. TougenRoushi
smime.p7s
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