Dave Rice

I tried to see if the OP of an issue could be changed, but I don't think it's possible. I agree with @JeromeMartinez that this topic is interesting and should...

I suggest referencing the proposal on the [CELLAR list serv](https://www.ietf.org/mailman/listinfo/cellar). For support for an AC4 Mapping, the codec spec document at https://github.com/Matroska-Org/matroska-specification/blob/master/codec_specs.md would need adjustment., to clarify what private data...

See this note here, https://github.com/Matroska-Org/matroska-specification/issues/100#issuecomment-330007864. There were 83 files in archive.org using `A_EAC3`, I could look up those urls or associated muxers if needed.

If helpful here is a list of public files with A_EAC3 ``` http://www.archive.org/download/08052017CAQM8844JR8HF/08052017CAQM.mkv http://www.archive.org/download/Djdjfjd/Outcast.S02E05.1080p.WEBRip.X264-DEFLATE.mkv http://www.archive.org/download/Dakar2017DiarioDelDakar72050pSpaSPPCCTEAM/Dakar%202017%20-%20Diario%20del%20Dakar%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017EspecialDakarRTVE72050pSpaSPPCCTEAM/Dakar%202017%20-%20Especial%20Dakar%20RTVE%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa01AsuncionResistencia72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2001%20-%20Asuncion%20-%20Resistencia%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa02ResistenciaSanMiguelDeTucuman72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2002%20-%20Resistencia%20-%20San%20Miguel%20de%20Tucuman%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa03SanMiguelDeTucumanSanSalvadorDeJujuy72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2003%20-%20San%20Miguel%20de%20Tucuman%20-%20San%20Salvador%20de%20Jujuy%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa04SanSalvadorDeJujuyTupiza72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2004%20-%20San%20Salvador%20de%20Jujuy%20-%20Tupiza%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa07LaPazUyuni72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2007%20-%20La%20Paz%20-%20Uyuni%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa08UyuniSalta72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2008%20-%20Uyuni%20-%20Salta%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa09SaltaChilecito72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2009%20-%20Salta%20-%20Chilecito%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa10ChilecitoSanJuan72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2010%20-%20Chilecito%20-%20San%20Juan%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017Etapa11SanJuanRioCuarto72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%2011%20-%20San%20Juan%20-%20Rio%20Cuarto%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017EtapaDeDescanso72050pSpaSPPCCTEAM/Dakar%202017%20-%20Etapa%20de%20Descanso%20720@50p%20Spa%20[SPPCCTEAM].mkv http://www.archive.org/download/Dakar2017PresentacionPilotosEspanoles72050pSPPCCTEAM/Dakar%202017%20-%20Presentacion%20Pilotos%20Españoles%20720@50p%20[SPPCCTEAM].mkv http://www.archive.org/download/Dhsjs/Outcast.S02E04.1080p.WEBRip.X264-DEFLATE.mkv http://www.archive.org/download/Dkdkddj/Outcast.S02E05.1080p.WEBRip.X264-DEFLATE.mkv http://www.archive.org/download/fsfaf/Outcast.S02E07.1080p.WEBRip.X264-DEFLATE[ettv].mkv...

I did a receive crawl of the Matroska collection on archive.org, here's a histogram of the CodecID's used, maybe aren't referenced in the codec-mapping.md doc. ``` 76209 A_AAC 3 A_AAC/MPEG2/LC...

Do you mean the `A_MS/ACM` Codec Mapping or the little phrases such as `Corresponding ACM wFormatTag : 0x0055`?

In the last survey I did of archive.org, there were at least 25 ACM files.

for reference here are a set of sample files using the Codec ID: ``` http://www.archive.org/download/Arabasma.OnePiece351/arabasma.One%20Piece%20-%20357%20-%20.mkv http://www.archive.org/download/Arabasma.OnePiece351/arabasma.One%20Piece%20-%20358%20-%20.mkv http://www.archive.org/download/Arabasma.OnePiece351/arabasma.One%20Piece%20-%20359%20-%20.mkv http://www.archive.org/download/DPRK-KCTV-2013-08-13/DPRK-KCTV-2013-08-13.mkv http://www.archive.org/download/FasleBahar1393Doostiha.IR2/Fasle_Bahar_1393_(Doostiha.IR)_2.mkv http://www.archive.org/download/OP08-Shashah.tv/OP357_Shashah-tv.mkv http://www.archive.org/download/OP08-Shashah.tv/OP358_Shashah-tv.mkv http://www.archive.org/download/OP08-Shashah.tv/OP359_Shashah-tv.mkv http://www.archive.org/download/op301-400ByMetalghost/One_Piece_357_metalghost_3asq.com.mkv http://www.archive.org/download/op301-400ByMetalghost/One_Piece_358_metalghost_3asq.com.mkv http://www.archive.org/download/op301-400ByMetalghost/One_Piece_359_metalghost_3asq.com.mkv http://www.archive.org/download/O_P_All/OnePiece-357-.mkv http://www.archive.org/download/O_P_All/OnePiece-358-.mkv http://www.archive.org/download/O_P_All/OnePiece-359-.mkv http://www.archive.org/download/OnePiece-ITALIAN/One%20Piece%20-%20357%20-%20.mkv http://www.archive.org/download/OnePiece-ITALIAN/One%20Piece%20-%20358%20-%20.mkv...

lol watching it now. It uses mp3 audio.

Agreed, but perhaps the order should be: 1. add codec mappings for the V_MS/VFW/FOURCC and A_MS/ACM encodings in use (I can survey archive.org's collection for this) 2. deprecate V_MS/VFW/FOURCC and...