OptimFROG

{{Short description|Lossless audio compression codec}}

{{Infobox software

| name = OptimFROG

| logo =

| screenshot =

| caption =

| developer = Florin Ghido

| latest_release_version = 5.100

| latest_release_date = {{Start date and age|2016|09|02}}

| latest preview version =

| latest preview date =

| operating_system = FreeBSD, Linux, OS X, Microsoft Windows

| genre = Audio codec

| website = {{URL|losslessaudio.org}}

}}

{{Infobox file format

| name = OptimFROG Audio file format

| _noextcode = true

| extensions = {{Unbulleted indent list|{{Code|.off}}
(OptimFROG Float)|{{Code|.ofr}}
(OptimFROG Lossless)|{{Code|.ofs}}
(OptimFROG Small,
 a/k/a DualStream)}}

| mime = audio/x-off
audio/x-ofr
audio/x-ofs

| magic =

| max_size =

| developer = Florin Ghido

| released = {{Start date and age|2001|12|20|df=no|br=y}}{{Cite web|last=Ghido|first=Florin|date=2022-03-04|title=News|url=http://losslessaudio.org/News.php|url-status=live|archive-url=https://web.archive.org/web/20220813114506if_/http://losslessaudio.org/News.php|archive-date=2022-08-13|access-date=2025-01-24|website=OptimFROG|df=mdy-all}}

| latest_release_version = 5.100

| latest_release_date = {{Start date and age|2016|09|02|df=no|br=y}}

| type = Audio codec

| compression = Lossless/lossy hybrid

| contained_by =

| extended_from =

| free = Yes{{Cite web|last=Ghido|first=Florin|date=2015-06-21|title=License|url=http://losslessaudio.org/License.php|url-status=live|archive-url=https://web.archive.org/web/20220301042631if_/http://losslessaudio.org/License.php|archive-date=2022-03-01|access-date=2025-01-24|website=OptimFROG|df=mdy-all}}

| open = No

| url = {{URL|http://losslessaudio.org/}}

}}

OptimFROG is a proprietary, lossless audio codec developed by Florin Ghido. OptimFROG is optimized for high compression (small file sizes) at the expense of encoding and decoding speed, and consistently measures among the highest compressing lossless codecs.{{Cite web |last=Martijn van Beurden |title=Lossless audio codec comparison |url=http://www.audiograaf.nl/downloads.html |url-status=live |archive-url=https://web.archive.org/web/20220331123726/http://www.audiograaf.nl/downloads.html |archive-date=2022-03-31 |access-date=2022-03-14}}{{Cite web |title=SqueezeChart 2013 Lossless Audio Compression |url=http://www.squeezechart.com/audio.html |url-status=live |archive-url=https://archive.today/20131005180724/http://www.squeezechart.com/audio.html |archive-date=2013-10-05 |access-date=2022-03-14}} OptimFROG comes with three compressors: a lossless codec for integer LPCM format in WAV files, one for IEEE 754 floating-point WAV files, and third codec called DualStream.

OptimFROG DualStream is lossy, but fill the gap between perceptual coding and lossless coding by producing a correction file. In combination with the main, lossy-encoded file, the correction file provides for lossless decoding. The lossless decoding is computationally intense and cannot be done in real time on contemporary hardware.{{Cite web |title=How to use OptimFROG DualStream Correction files? |url=http://www.hydrogenaud.io/forums/index.php?showtopic=37082 |url-status=live |archive-url=https://web.archive.org/web/20150714054018/http://www.hydrogenaud.io/forums/index.php?showtopic=37082 |archive-date=2015-07-14 |access-date=2015-07-13 |website=Hydrogenaudio Forums}} The rival audio codecs WavPack. MPEG-4 SLS, and DTS-HD Master Audio also offer correction file generation.

The OptimFROG file formats use APEv2 tags to store the metadata. ID3 is also possible.