Re: [FFmpeg-user] Differences in output between FFmpeg versions
Hi Moritz, Thank you for the response. It's not 100% clear to me what the differences are since it's decoded output, but when converting the same exact MP3 file with different FFmpeg versions the decoded output files are different in size and don't fully match up throughout the file. For example on a test MP3 file the decoded output using v2.2.1 had far more leading 0s than the output from the v4.1.1 version. Past that it mostly comes down to numerous flipped bits throughout the files. I'm not sure what "more correctly" is in this context, and if one is more correct I would assume the latest version is the most correct, but the outputs are undeniably different. As for the consequences, I can't go into too much detail unfortunately, but because we are trying to match songs and the first step is to decode the audio it becomes far more difficult when the same exact song has different decoded output depending on when it was decoded. Would it be helpful if I posted the outputs of a decoded MP3 file? -Ethan On Tue, Oct 15, 2019 at 3:44 PM Moritz Barsnick wrote: > On Tue, Oct 15, 2019 at 15:08:56 -0600, Ethan Coeytaux wrote: > > > When upgrading however we noticed there are substantial differences > > in the output of FFmpeg when using a newer version (either 2.6.8, > > 3.3.4, or 4.1.1) compared to the older version, which has notable > > consequences on our analysis of the audio. However, the output from > > 2.6.8, 3.3.4, and 4.1.1, while still different, are much more similar > > than the output from 2.2.1. > [...] > > Any tips or advice would be much appreciated, thank you! > > You forgot to tell us what those differences in the output are. What > are the "consequences on our analysis of the audio"? > > Are you saying audio was decoded (to raw) more correctly previously > than it is now? > > I believe decoding of MP3 and AAC should be pretty precise. You can try > alternative decoders (such as libfdk_aac) for comparison, but I'm > riddled what you mean. > > Moritz > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] Differences in output between FFmpeg versions
Hello all, My work involves analyzing large quantities of songs and determining "matches" and for some time we've been using FFmpeg to convert MP3s and AACs from numerous sources to raw data to then analyze. However this system was put into place several years ago and we're still using a very old version of FFmpeg (v2.2.1). When upgrading however we noticed there are substantial differences in the output of FFmpeg when using a newer version (either 2.6.8, 3.3.4, or 4.1.1) compared to the older version, which has notable consequences on our analysis of the audio. However, the output from 2.6.8, 3.3.4, and 4.1.1, while still different, are much more similar than the output from 2.2.1. My question is: are there any ways to eliminate or minimize these changes in the output? The command we're running is "ffmpeg -loglevel warning -i $AUDIODIR/$filename -ar 8000 -ac 1 -f s16le -acodec pcm_s16le $RAMDIR/RAW/$rawFilename". The config for our v2.2.1 version is: ffmpeg version 2.2.1 built on Dec 11 2015 16:14:14 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16) --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-libass --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect libavutil 52. 66.100 / 52. 66.100 libavcodec 55. 52.102 / 55. 52.102 libavformat55. 33.100 / 55. 33.100 libavdevice55. 10.100 / 55. 10.100 libavfilter 4. 2.100 / 4. 2.100 libavresample 1. 2. 0 / 1. 2. 0 libswscale 2. 5.102 / 2. 5.102 libswresample 0. 18.100 / 0. 18.100 libpostproc52. 3.100 / 52. 3.100 and the config for v4.1.1 is: ffmpeg version 4.1.1-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2019 the FFmpeg developers built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516 --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzvbi --enable-libzimg libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat58. 20.100 / 58. 20.100 libavdevice58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc55. 3.100 / 55. 3.100 Any tips or advice would be much appreciated, thank you! - Ethan Coeytaux ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
