Re: [FFmpeg-user] Differences in output between FFmpeg versions
Am Mi., 16. Okt. 2019 um 00:25 Uhr schrieb Ethan Coeytaux : > 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. Note that v4.1.1 is old and unsupported. The leading zeros sound like a bug fix. Please find out what top-posting means and avoid it here. Carl Eugen ___ 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".
Re: [FFmpeg-user] Differences in output between FFmpeg versions
Am Di., 15. Okt. 2019 um 23:44 Uhr schrieb Moritz Barsnick : > I believe decoding of MP3 and AAC should be pretty precise. I believe that both mp3 and aac are not supposed to decode to one "correct" output, both know many correct outputs. So the fact that the outputs are different is not a sufficient indication for a bug. But as always: Command line and complete, uncut console output missing, I suspect it will provide part of the answer. Carl Eugen ___ 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".
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".
Re: [FFmpeg-user] Differences in output between FFmpeg versions
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".
