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What features would you like to see in opus-tools?
NullC
post Jan 22 2013, 21:13
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I'm looking for suggested features to get into opus-tools prior to the libopus 1.1 release.

Before I get 1001 suggestions for it: One frequently requested feature which was recently added is flac input in opusenc. I'm contemplating changing opusdec to use the new opusfile libraryŚ which would give it seeking and integrated http(s) streaming support. Also already on my todo list are default comment packet padding so updating metadata doesn't require rewriting the files and adding a replaygain tool.

Some people would really like it if opusenc/opusdec supported taking multiple input files e.g. opusenc *.flac but the implicit output file naming is pretty ununixy, and would break the interface and I got flamed all to heck last time I changed the opusenc interface.... so I'm not sure if/how I want to accommodate that usage.

What other things have you found missing?
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darkbyte
post Mar 13 2013, 12:56
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I think a per channel bitrate setting would be useful. For eg. i'm encoding my music collection recently into 80kbps Opus and i have some mono chiptune albums and they are getting as high bitrate as 100kbps. If i manually encode them using --bitrate 40 kbps i still get very good quality but just a bitrate around 50-60kbps. So a --bitrate-per-channel 40 would be very useful. This will be 40kbps for mono, 80kbps for Stereo. Or maybe an option to provide a bitrate list for different channel configurations. Someone might want to give a mono recording a bit higher bitrate to be on the safe side.

This post has been edited by darkbyte: Mar 13 2013, 13:07


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jmvalin
post Mar 13 2013, 15:30
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QUOTE (darkbyte @ Mar 13 2013, 07:56) *
I think a per channel bitrate setting would be useful. For eg. i'm encoding my music collection recently into 80kbps Opus and i have some mono chiptune albums and they are getting as high bitrate as 100kbps. If i manually encode them using --bitrate 40 kbps i still get very good quality but just a bitrate around 50-60kbps. So a --bitrate-per-channel 40 would be very useful. This will be 40kbps for mono, 80kbps for Stereo. Or maybe an option to provide a bitrate list for different channel configurations. Someone might want to give a mono recording a bit higher bitrate to be on the safe side.


Actually, the 1.1-alpha encoder will automatically reduce the bit-rate when the input is mono (well, when the file has two identical channels).
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darkbyte
post Mar 13 2013, 17:19
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QUOTE (jmvalin @ Mar 13 2013, 16:30) *
Actually, the 1.1-alpha encoder will automatically reduce the bit-rate when the input is mono (well, when the file has two identical channels).


Strange, i'm using the 1.1-alpha-39-g10a35a5-babyeater build but i'm getting the described 100kbps bitrate on some chiptune samples instead of a lower one. Maybe the source is just sounds Mono to me but it has some differences because of dithering or such. sad.gif

Btw, i forgot that with --bitrate 40 i'm using the --downmix-mono switch on a stereo source where both channels sound equal to me. Otherwise i get the described 100kbps bitrate. So either the mono detection of Opus doesn't work or my source files are just sound mono.
I think i'll upload a sample.

Mod: here's one 30sec sample
This seems like pure mono sample to me. If you encode it with --bitrate 80 it ends up as 71kbps. If i encode it with --bitrate 40 --downmix-mono it will be a 43kbps Opus and it sounds the same to me.
Looks like the beginning of this track is boosting the bitrate a lot. This track ends up at 100kbps but only if i encode it in it's whole length. This 30sec sample encodes into a close to 80kbps size. blink.gif I think i can't upload the whole track here, it's from the commercial CD "C64 Orchestra - Run 10".

It would be interesting to see if the SID directly converted and upmixed into stereo WAV and then encoded with Opus will end up with the same high bitrate.

Mod2: okay i think i've screwed up something. Now i can't reproduce the high bitrate even on the whole length of the song. Maybe i was encoding yesterday with the non babyeater build. ohmy.gif

I think you should ignore this post for now.

This post has been edited by darkbyte: Mar 13 2013, 18:12


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Posts in this topic
- NullC   What features would you like to see in opus-tools?   Jan 22 2013, 21:13
- - skamp   What I'd like: an equivalent to vorbiscomment...   Jan 22 2013, 21:25
|- - nu774   QUOTE (skamp @ Jan 23 2013, 05:25) Slight...   Jan 23 2013, 13:12
||- - nu774   QUOTE (nu774 @ Jan 23 2013, 21:12) If I r...   Jan 23 2013, 15:15
|- - skamp   QUOTE (skamp @ Jan 22 2013, 22:25) an equ...   Jul 1 2013, 10:10
|- - Brazil2   QUOTE (skamp @ Jul 1 2013, 11:10) Well, F...   Jul 1 2013, 12:42
- - CoRoNe   Perhaps totally off-topic, but could you lend the ...   Jan 23 2013, 00:31
|- - Seren   Can't really think of anything atm except mayb...   Jan 23 2013, 12:04
|- - DonP   QUOTE (Seren @ Jan 23 2013, 06:04) Can...   Jan 23 2013, 13:14
|- - Banned   QUOTE (lvqcl @ Jan 23 2013, 15:40) Curren...   Jan 23 2013, 19:45
|- - DonP   QUOTE (Banned @ Jan 23 2013, 13:45) QUOTE...   Jan 23 2013, 20:39
|- - NullC   QUOTE (Banned @ Jan 23 2013, 11:45) Well,...   Jan 23 2013, 21:31
|- - Banned   QUOTE (NullC @ Jan 23 2013, 21:31) QUOTE ...   Jan 28 2013, 18:26
- - mamboman   Yes, converting flac to opus will be a very common...   Jan 23 2013, 12:56
|- - gottkaiser   QUOTE (mamboman @ Jan 23 2013, 12:56) ......   Jan 23 2013, 19:38
- - lvqcl   Currently opusenc requires the output filename and...   Jan 23 2013, 15:40
- - .alexander.   QUOTE (NullC @ Jan 23 2013, 00:13) I...   Jan 23 2013, 19:06
|- - saratoga   QUOTE (.alexander. @ Jan 23 2013, 13:06) ...   Jan 23 2013, 23:32
||- - .alexander.   QUOTE (saratoga @ Jan 24 2013, 02:32) Tha...   Jan 24 2013, 00:04
|- - jmvalin   QUOTE (.alexander. @ Jan 23 2013, 13:06) ...   Jan 24 2013, 02:02
- - Dynamic   I think there was a time when VBR quality scales t...   Jan 23 2013, 23:20
- - azaqiel   I would like an opus gain tool that ONLY TAGS the ...   Jan 24 2013, 04:41
- - LithosZA   A maximum bandwidth setting. In libopus the bandwi...   Jan 26 2013, 12:40
- - IgorC   Intensity stereo (IS) setting as all other phsycoa...   Jan 26 2013, 13:09
- - bat_guano   QUOTE (NullC @ Jan 22 2013, 21:13) I...   Jan 26 2013, 19:02
- - nu774   Bitrate might be surely enough when one is working...   Jan 27 2013, 17:42
- - Dynamic   I think QAAC's TVBR settings are roughly half ...   Jan 28 2013, 03:30
|- - NullC   QUOTE (Dynamic @ Jan 27 2013, 18:30) If p...   Feb 4 2013, 19:58
- - moosehunter   There are a few things that I'd like to see. I...   Feb 10 2013, 05:43
|- - NullC   QUOTE (moosehunter @ Feb 9 2013, 20:43) T...   Feb 15 2013, 20:02
||- - moosehunter   QUOTE (NullC @ Feb 15 2013, 13:02) Use th...   Feb 18 2013, 00:31
|- - jensend   Wrote much of this almost a week ago; realized I s...   Feb 15 2013, 20:22
|- - moosehunter   (Can you not edit your posts?) QUOTE (jensend ...   Feb 18 2013, 01:49
|- - jensend   You can edit your posts- but only for one hour aft...   Feb 18 2013, 17:00
|- - moosehunter   QUOTE (jensend @ Feb 18 2013, 10:00) This...   Feb 19 2013, 01:56
|- - jmvalin   QUOTE (jensend @ Feb 18 2013, 11:00) Inte...   Feb 19 2013, 07:11
- - LithosZA   QUOTE A maximum bandwidth setting. In libopus the ...   Feb 18 2013, 06:45
- - Omicron   It would be good to make a feature in encoder so u...   Feb 21 2013, 12:28
|- - db1989   QUOTE (Omicron @ Feb 21 2013, 11:28) It w...   Feb 21 2013, 21:22
- - azaqiel   @Omicron: impossible. how would the said encoder...   Feb 21 2013, 21:15
- - kennedyb4   Tags that would work in Rockbox would be great.   Feb 21 2013, 23:41
- - Omicron   QUOTE how would the said encoder know how good the...   Feb 22 2013, 22:01
|- - db1989   Is there something contagious going around Hydroge...   Feb 22 2013, 22:30
||- - NullC   QUOTE (db1989 @ Feb 22 2013, 13:30) Is th...   Feb 22 2013, 23:44
||- - jensend   QUOTE (NullC @ Feb 22 2013, 15:44) I will...   Feb 23 2013, 20:48
|- - jmvalin   QUOTE (Omicron @ Feb 22 2013, 16:01) I th...   Feb 23 2013, 02:29
- - darkbyte   I think a per channel bitrate setting would be use...   Mar 13 2013, 12:56
|- - jmvalin   QUOTE (darkbyte @ Mar 13 2013, 07:56) I t...   Mar 13 2013, 15:30
|- - darkbyte   QUOTE (jmvalin @ Mar 13 2013, 16:30) Actu...   Mar 13 2013, 17:19
|- - jmvalin   QUOTE (darkbyte @ Mar 13 2013, 12:19) Str...   Mar 13 2013, 21:10
- - polemon   All features I'd like to see in opus-tools, ha...   Jun 24 2013, 16:11
- - NullC   QUOTE (polemon @ Jun 24 2013, 08:11) All ...   Jun 27 2013, 11:25
- - polemon   QUOTE (NullC @ Jun 27 2013, 12:25) well, ...   Jun 28 2013, 05:55
- - NullC   QUOTE (polemon @ Jun 27 2013, 21:55) QUOT...   Jul 1 2013, 16:23


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