KRA 39 Posted February 14, 2015 Share Posted February 14, 2015 I have tried several different media codecs and containers. But it always transcode. I'm on server Versjon 3.0.5518.4 installed on ubuntu 14.04.1 using chrome/web ui to client. This is massive waste of resource and create a lot of unwanted heat in the server. Link to comment Share on other sites More sharing options...
Luke 37250 Posted February 14, 2015 Share Posted February 14, 2015 That doesn't sound broken to me. Link to comment Share on other sites More sharing options...
KRA 39 Posted February 14, 2015 Author Share Posted February 14, 2015 @@Luke "That's not a bug that's a feature :/" IMHO it's not working as intended. If your car is using 10 times the amount of fuel that is needed, wouldn't you say something is broken ? If you work hard for an hour to achieve something that can be done in seconds, wouldn't you say your doing something wrong ? I have confirmed files playing on chromecast fine without need of transcoding, however MBS always does full transcode. Whatever container/codec/bitrate is used it transcode to seemingly the same quality settings, and same video codec ( except it caps at 10mbit for bitrate). It also transcode DTS audio (chromecast supported) into AAC audio. Original video codec that plays fine (but is transcoded anyways) : Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4.1 Format settings, CABAC : Yes Format settings, ReFrames : 5 frames Codec ID : V_MPEG4/ISO/AVC Duration : 1h 55mn Bit rate : 9 296 Kbps Width : 1 920 pixels Height : 800 pixels Display aspect ratio : 2.40:1 Frame rate mode : Constant Frame rate : 23.976 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.252 Stream size : 7.35 GiB (84%) Writing library : x264 core 144 r2525 40bb568 Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=9296 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00 Language : English Default : Yes Forced : No Audio ID : 2 Format : DTS Format/Info : Digital Theater Systems Mode : 16 Format settings, Endianness : Big Codec ID : A_DTS Duration : 1h 55mn Bit rate mode : Constant Bit rate : 1 509 Kbps Channel(s) : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 KHz Bit depth : 24 bits Compression mode : Lossy Stream size : 1.22 GiB (14%) Language : English Default : Yes Forced : No What it is transcoded into: Video ID : 256 (0x100) Menu ID : 1 (0x1) Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4.1 Format settings, CABAC : Yes Format settings, ReFrames : 4 frames Codec ID : 27 Duration : 6s 6ms Width : 1 920 pixels Height : 800 pixels Display aspect ratio : 2.40:1 Frame rate mode : Variable Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Audio ID : 257 (0x101) Menu ID : 1 (0x1) Format : AAC Format/Info : Advanced Audio Codec Format version : Version 4 Format profile : LC Muxing mode : ADTS Codec ID : 15 Duration : 5s 994ms Bit rate mode : Variable Channel(s) : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 KHz Compression mode : Lossy Delay relative to video : -75ms Link to comment Share on other sites More sharing options...
Luke 37250 Posted February 14, 2015 Share Posted February 14, 2015 chromecast is known to reliably support up to 4 refframes, sorry. Your video has 5 and maybe in your case it could actually direct stream, but right now 4 is considered the safe rule of thumb for Chromecast. Link to comment Share on other sites More sharing options...
KRA 39 Posted February 14, 2015 Author Share Posted February 14, 2015 (edited) @@Luke ok that is a valid concern, even though I have not had issues. And after doing some research I understand why I'm not having issues. 4 reframes is a limitation of L4.1@1080p However the movie above is 1920x800 and as I understand is within the limits even if it's using 5 reframes. Also as far as I can tell, 4 reframes is not a limit of chromecast it's the limit of L4.1 @ 1080p specs, if you go down to ex 720p 5 reframes is well within specs. (9 is limit at 720p) But 720p also end up being transcoded, did someone misinterpret 4 reframes as a definitive chromecast limit ? Edited February 14, 2015 by KRA Link to comment Share on other sites More sharing options...
cherno_cba 0 Posted February 22, 2015 Share Posted February 22, 2015 I have the same issue here. I can play a file without transcoding using Videostream for chrome, but if I use MediaBrowser it does the transcoding, and I end with high cpu usage, and worse image quality. Video Codec H264 Profile High Level 31 Resolution 720x404 Aspect ratio 16:9 Anamorphic No Interlaced No Framerate 23.97602 Bitrate 682 kbps Bit depth 8 bit Pixel format yuv420p Ref frames 5 CABAC Yes Chromecast is able to transcode a 720p or 1080p file, so why shouldn't be able to play a 480p ??? Isn't Chromecast supposed to play h264 up to level 4.1? Link to comment Share on other sites More sharing options...
KRA 39 Posted February 22, 2015 Author Share Posted February 22, 2015 (edited) Ref frames 5 Chromecast is able to transcode a 720p or 1080p file, so why shouldn't be able to play a 480p ??? Isn't Chromecast supposed to play h264 up to level 4.1? @@cherno_cba @@Luke It is, the problem here seems to be that MBS reads the "Ref frames 5", and automaticly transcode, because at full 1080p Ref frames 4 is max to keep within the 4.1 specs. As I also wrote here: http://mediabrowser.tv/community/index.php?/topic/17611-chromecast-and-ac3-passthrought/page-2&do=findComment&comment=177643 At lower resolution higher Ref frames should be no problem, this is also my experience. Hopefully they will tweak chromecast settings soon so we don't have to transcode fully compatible audio and video streams. Edited February 22, 2015 by KRA Link to comment Share on other sites More sharing options...
cherno_cba 0 Posted February 25, 2015 Share Posted February 25, 2015 Thanks for the info! Hopefully the devs will tweak this. Link to comment Share on other sites More sharing options...
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