>> >> >> > On Sat, Apr 9, 2022 at 5:22 PM morgan holly via ffmpeg-user >> > <[email protected] <mailto:[email protected]>> wrote: >> > this is part question and part warning. When I run the cmd below FFMPEG >> > automatically knocks my 24bit source audio down to 8bits(!). I was able to >> > change that by adding 'aformat=sample_fmts=s32' into the filterchain for >> > the anullsrc inputs. >> > >> > The warning is: make sure you check your output quality if you use lavfi >> > slugs with your audio. 24->8bits, yikes. >> > >> > The question is: Can I specify the format of the nullsource when using >> > lavfi. Seems dangerous that it defaults to fmt:u8. Am I doing something >> > wrong? >> > >> > You are not setting aformat right after anullsrc filter. >> > >> >> Thanks for the response. I googled it out and ended up with this: >> >> ffmpeg -y -f lavfi -t 1.724 -i >> anullsrc=channel_layout=mono:sample_rate=48000,aformat=s32 -ss 120 -t >> 30.327979 -i /tmp/2ch.mov -f lavfi -t 1.724 -i >> anullsrc=channel_layout=mono:sample_rate=48000,aformat=s32 -filter_complex >> "[0:a:0][1:a:0][2:a:0]concat=n=3:v=0:a=1[sf1_out]" -map [sf1_out] >> /tmp/noisetest.wav >> >> It works, but it does seem odd that the default bit depth of nullsrc would >> be 8. > > That is because your source is not connected with rest of filters, so > guessing best format never can happen.
I don’t understand, but would like to. I have three sources here: mov and 2 lavfi, everything is connected in concat. _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
