Since most video software encodes the audio track as AAC, the AAC track Youtube provides is likely an AAC -> AAC transcode, which will be better than an AAC -> Opus transcode. Additionally, Opus is not always the best option for music. Although Opus is very good at a variety of audio, it does not necessarily beat all other lossy codecs in every ...

Mar 24, 2019 · ...the converted M4A files have much higher bitrates (and file sizes) than the original OPUS files, averaging more than 400kbps. This is more than a 300% increase in bitrate. Is this a bug with the post-processing stage of youtube-dl , or is it expected behaviour?

Dec 21, 2018 · In general, the VP9- and Opus-encoded formats will be the one offering better quality; these are the itags starting with a "2". As these are way more efficient (i.e., offer better quality at the same size) than the H.264- and AAC-encoded video …

May 24, 2018 · Given that opus is more efficient/better, quality will be higher at the same bitrate. But would transcoding the opus to AAC (e.g. at 192kbs/212kbs) maintain that quality difference, or would the transcoding (even to a higher bitrate) induce artefacts so that the audio quality of the 192kbs AAC file would actually be worse than the AAC 128kbs file ?

Mar 13, 2022 · This should be a very simple task and can be handled by this very basic command that outputs an M4A file: ffmpeg -i input.opus output.m4a Or even this for MP3 output:

youtube-dl -f bestaudio[ext=m4a] --embed-thumbnail --add-metadata <Video-URL> resulting in an m4a file or. youtube-dl -f bestaudio --extract-audio --embed-thumbnail --add-metadata <Video-URL> The latter can also resul in an ogg file if the highest audio quality format is OPUS rather than AAC. You can list the available format with

Oct 30, 2016 · It's like making a xerox of a xerox. You amplify distortions. Ideally you should be transcoding from a lossless format like .flac or .wav to a lossy format like m4a, ogg or mp3. My ears are not very discriminating (also I'm 51!), but I find 192kpbs vbr 0 is more than adequate for mp3, and perhaps lower is sufficient for m4a.

Dec 8, 2012 · The best Opus Codec commands in DOS/Windows Command would be: For lib 1.3, smallest filesize (tape quality): Opusenc a.wav a.opus --bitrate 24 --framesize 40 --discard-comments --discard-pictures You will: a- at 24kbits still have a 16kHz (32kHz stereo) sonic output, on a super small size. Any smaller, and Sonic output will drop to 11kHz

I tried doing something simple like: ffmpeg -i FILE.m4a FILE.mp3 but this seems to reduce the bitrate to a very low value, which isn't what I want. Similarly I don't want to convert using a constant bitrate, such as 320k, because some of the files I am converting are 320k m4a's and some are as low quality as 96k m4a's.

Jan 9, 2020 · It does work sometimes when you have m4a container as "best" audio stream, does work if you manually specify -format 251 which is overkill. It doesn't work with for m4a_dash container as best possible audio stream. I'm assuming because there is no way to demux opus from m4a_dash.