Also, according to my latest tests, HE-AAC v2 also supports VBR encoding with `-vbr 5` as well.
Also, till now, I used 96khz as sampling rate for vbr 5. I did many encodes with these settings, but it was all flawless! I guess, these bugs related to VBR and other things that you mentioned are all fixed, but I guess the Fraunhofer people forget to remove the warning it seems. On Sun, 28 Apr, 2024, 9:55 pm Ferdi Scholten, <fe...@sttc-nlp.nl> wrote: > On 28-04-2024 12:44, Aditya Dandavate wrote: > > I was converting flac audio to aac_lc with libfdk_aac with VBR encoding. > > But I saw a message about VBR encoding. > > > > The command and output of the command is as follows : > > > > Command : > > > > ffmpeg.exe -i input.flac -c:a libfdk_aac -afterburner 1 -frame_length > 1024 > > -cutoff 0 -vbr 5 -profile:a aac_low output.m4a° > > > > Output : > > > > F:\DSDA-Doom>ffmpeg.exe -i input.flac -c:a libfdk_aac -afterburner 1 > > -cutoff 0 -frame_length 1024 -profile:a aac_low -vbr 5 output.m4a > > ffmpeg version N-115010-ga2cdb2f5be Copyright (c) 2000-2024 the FFmpeg > > developers > > built with gcc 13.2.0 (Rev6, Built by MSYS2 project) > > configuration: --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache > > g++' --ld='ccache g++' --extra-cxxflags=-fpermissive > > --extra-cflags=-Wno-int-conversion --disable-autodetect > > --enable-libopus --enable-libvorbis --enable-libx264 --enable-libx265 > > --enable-libaom --disable-debug --enable-libfdk-aac --enable-schannel > > --enable-gpl --enable-nonfree > > libavutil 59. 16.101 / 59. 16.101 > > libavcodec 61. 5.103 / 61. 5.103 > > libavformat 61. 3.103 / 61. 3.103 > > libavdevice 61. 2.100 / 61. 2.100 > > libavfilter 10. 2.101 / 10. 2.101 > > libswscale 8. 2.100 / 8. 2.100 > > libswresample 5. 2.100 / 5. 2.100 > > libpostproc 58. 2.100 / 58. 2.100 > > Input #0, flac, from 'input.flac': > > Metadata: > > encoder : Lavf61.3.103 > > Duration: 02:05:52.13, start: 0.000000, bitrate: 621 kb/s > > Stream #0:0: Audio: flac, 48000 Hz, stereo, s16 > > Stream mapping: > > Stream #0:0 -> #0:0 (flac (native) -> aac (libfdk_aac)) > > Press [q] to stop, [?] for help > > [libfdk_aac @ 000001b9623d7400] *Note, the VBR setting is unsupported > > and only works with some parameter combinations* > > Output #0, ipod, to 'output.m4a': > > Metadata: > > encoder : Lavf61.3.103 > > Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, > s16 > > Metadata: > > encoder : Lavc61.5.103 libfdk_aac > > [out#0/ipod @ 000001b962402280] video:0KiB audio:229238KiB > > subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: > > 0.605099% > > size= 230625KiB time=02:05:52.13 bitrate= 250.2kbits/s speed=18.1x > > > > F:\DSDA-Doom>pause > > Press any key to continue . . . > > > > > > So, may I know what's wrong with VBR to the point its unsupported ? Is > > it going to be removed in the future from the encoder ? Is it > > considered experimental or stable ? > > > > > > Please tell me about this 🙏 > > > > > > Thanks > > > Well, the warning is not from ffmpeg but from libfdk_aac and this is the > reason: > > "As of FDK version 3.4.12, not all combinations of audio object > types, bitrate modes, channel layouts, and sample rates can be used > together, due to a limited table of pre-computed values used by the > encoder. For example, using 96kHz stereo input with the AAC-LC audio > object type and bitrate mode 5 (VBR 96-112kbps/channel) will result in > catastrophic failure" > > There has been a patch to (partly) resolve this, but it still has > limits, hence the warning. > > Also, VBR 1-4 can only be used with specific (low) sampling rates, only > 5 can be used for samplerates >15 kHz > > Fraunhofer does not recommend using VBR with this codec. > > Generally, if your device supports the Opus codec, use that, it has > (much) better quality at the same bitrate as AAC, or much smaller files > with the same quality as AAC > _______________________________________________ > 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".
