Re: [FFmpeg-devel] Atempo limits
On Mon, Jun 4, 2018 at 8:54 PM, Pavel Koshevoy wrote: > On 06/04/2018 08:35 PM, Ronak Patel wrote: >> >> Thanks. Is it okay if I push a patch for this? How high of a limit does >> the algorithm support today? >> > > I don't think there is an upper limit... Post a patch here for review. See > http://www.ffmpeg.org/developer.html#Submitting-patches-1 > > Pavel. > I've posted a patch myself -- http://ffmpeg.org/pipermail/ffmpeg-devel/2018-June/231004.html ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] Atempo limits
On 06/04/2018 08:35 PM, Ronak Patel wrote: Thanks. Is it okay if I push a patch for this? How high of a limit does the algorithm support today? I don't think there is an upper limit... Post a patch here for review. See http://www.ffmpeg.org/developer.html#Submitting-patches-1 Pavel. ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] Atempo limits
We did consider rubberband, but the audio quality is too poor. The audio has echo artifacts in it that makes it sound robotic. Sent from my iPhone > On Jun 4, 2018, at 8:32 PM, Lou Logan wrote: > >> On Mon, Jun 4, 2018, at 10:09 AM, Ronak wrote: >> >> We are looking to use the atempo filter for our audio files. However, >> the limit between 0.5 - 2x is too restrictive for us. We would like to >> expand the limit to 0.5x - 3x. > > Consider using the rubberband filter instead if atempo is too simple or > restrictive. > ___ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] Atempo limits
Thanks. Is it okay if I push a patch for this? How high of a limit does the algorithm support today? Sent from my iPhone > On Jun 4, 2018, at 8:00 PM, Pavel Koshevoy wrote: > >> On 06/04/2018 12:09 PM, Ronak wrote: >> Hello, >> >> How are you all? >> >> We are looking to use the atempo filter for our audio files. However, the >> limit between 0.5 - 2x is too restrictive for us. We would like to expand >> the limit to 0.5x - 3x. >> >> I tried changing the range in atempo.c and the rest of the tempo filter just >> worked. >> > > Going below 0.5 is likely not going to sound good. Going above 2.0 should be > fine. The reason for current [0.5, 2.0] range is mostly for symmetry. > atempo=0.5 followed by atempo=2.0 should sound like original audio. This > should also point you to an alternative solution -- put 2 atempo filters one > after another to achieve tempo greater than 2 (atempo=2.0,atempo=1.5), or > like this: > > ffmpeg -i /scratch/Music/02\ Feeling\ Good.mp3 -af > 'atempo=sqrt(3.0),atempo=sqrt(3.0)' -y /tmp/tempo-3x.wav > > Pavel. > > ___ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] Atempo limits
On Mon, Jun 4, 2018, at 10:09 AM, Ronak wrote: > > We are looking to use the atempo filter for our audio files. However, > the limit between 0.5 - 2x is too restrictive for us. We would like to > expand the limit to 0.5x - 3x. Consider using the rubberband filter instead if atempo is too simple or restrictive. ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] Atempo limits
On 06/04/2018 12:09 PM, Ronak wrote: Hello, How are you all? We are looking to use the atempo filter for our audio files. However, the limit between 0.5 - 2x is too restrictive for us. We would like to expand the limit to 0.5x - 3x. I tried changing the range in atempo.c and the rest of the tempo filter just worked. Going below 0.5 is likely not going to sound good. Going above 2.0 should be fine. The reason for current [0.5, 2.0] range is mostly for symmetry. atempo=0.5 followed by atempo=2.0 should sound like original audio. This should also point you to an alternative solution -- put 2 atempo filters one after another to achieve tempo greater than 2 (atempo=2.0,atempo=1.5), or like this: ffmpeg -i /scratch/Music/02\ Feeling\ Good.mp3 -af 'atempo=sqrt(3.0),atempo=sqrt(3.0)' -y /tmp/tempo-3x.wav Pavel. ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
