In Addition... > 2017/01/30 11:54 A.M. 桃源老師 <xanadu6291<at>dream.jp> wrote: > > Hello ffmpeg experts... > > I have question about mp3 bit rate mode. > > When I run the following command, the resulting duration.mp3 is VBR. I have > confirmed it's bit rate mode with mediainfo, mpg123, and SinkuSuperLite (on > Windows). > > $ ffmpeg -f lavfi -i sine=d=300 duration.mp3 > ffmpeg version N-83152-gf7e9275 Copyright (c) 2000-2017 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, lavfi, from 'sine=d=300': > Duration: N/A, start: 0.000000, bitrate: 705 kb/s > Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s > Output #0, mp3, to 'duration.mp3': > Metadata: > TSSE : Lavf57.62.100 > Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, mono, s16p > Metadata: > encoder : Lavc57.74.100 libmp3lame > Stream mapping: > Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame)) > Press [q] to stop, [?] for help > size= 2344kB time=00:05:00.01 bitrate= 64.0kbits/s speed= 128x > video:0kB audio:2344kB subtitle:0kB other streams:0kB global headers:0kB > muxing overhead: 0.009457% > > And when I run the following command, the resulting duration.mp3 is CBR. > Confirmed with same program as above. > > $ ffmpeg -f lavfi -i sine=d=300 -write_xing 0 duration.mp3 > ffmpeg version N-83152-gf7e9275 Copyright (c) 2000-2017 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, lavfi, from 'sine=d=300': > Duration: N/A, start: 0.000000, bitrate: 705 kb/s > Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s > File 'duration.mp3' already exists. Overwrite ? [y/N] y > Output #0, mp3, to 'duration.mp3': > Metadata: > TSSE : Lavf57.62.100 > Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, mono, s16p > Metadata: > encoder : Lavc57.74.100 libmp3lame > Stream mapping: > Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame)) > Press [q] to stop, [?] for help > size= 2344kB time=00:05:00.01 bitrate= 64.0kbits/s speed= 134x > video:0kB audio:2344kB subtitle:0kB other streams:0kB global headers:0kB > muxing overhead: 0.001875%
The command which produces VBR mp3 file, "$ ffmpeg -f lavfi -i sine=d=300 duration.mp3"'s duration is 5:43 on Mac and is 5:01 on Windows. The command which produces CBR mp3 file, "$ ffmpeg -f lavfi -i sine=d=300 -write_xing 0 duration.mp3"'s duration is 5:00 on Mac/Win. So the issue of wrong duration is not only on Mac but also on Win, I think... Best Regards, Miya aka Tougen-Roushi
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".