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Chromecast Ultra Transcodes when it shouldn't


dasfox

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dasfox

I have a built-in chromecast ultra in my TV. And when I try and cast a movie where the bitrate is high in h.264 or h.265. It transcodes. I know it is not the chromecast since Plex can direct play the same movie on the chromecast. I used the jellyfish test files and found that Emby transcodes h.265 regardless of bitrate, and I could direct play the 30Mbps h.264 test file but not the 35Mbps h.264 test file.

 

Attached are screenshots from Plex and Emby with the transcoding status and logs from emby.

 

 

Emby transcodes this 3Mbps test HEVC file.

post-188933-0-18446600-1554242356_thumb.jpg

 

It can direct play this 30Mbps test h.264 file

post-188933-0-93320100-1554242403_thumb.jpg

 

But not this 35Mbps test h.264 file

post-188933-0-26436200-1554242437_thumb.jpg

 

Emby transcodes this movie in h.264 and h.265

post-188933-0-68539800-1554242480_thumb.jpg

post-188933-0-75058700-1554242507_thumb.jpg

 

But Plex can direct play the same movie in both h.264 and h.265

post-188933-0-73283900-1554242553_thumb.jpg

post-188933-0-99809100-1554242558_thumb.jpg

 

 

 

htttydLog.txt

JellyfishLog.txt

3mbpsHEVCLog.txt

Edited by dasfox
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Happy2Play

You will need to post the ffmpeg logs to show why it is transcoding.

Edited by Happy2Play
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Happy2Play

I don't know anything about Chromecast, so well have to wait for Luke's response.  But the condition shown for the device show these limitiations.

 

h.ttp://xxx.xxx.xxx.xxx:8096/emby/videos/3461/stream.mkv?DeviceId=TGl2aW5nIFJvb20gVFY1&MediaSourceId=xxxxxxxxxxxxxxxxxxxxxxxxx&VideoCodec=h264,vp8,vp9&AudioCodec=ac3,eac3,aac,mp3,opus,flac,vorbis&VideoBitrate=30000000&AudioBitrate=192000&PlaySessionId=d332287060a249f2974fcbbf945287e7&api_key=APIKEY&TranscodingMaxAudioChannels=6&CopyTimestamps=true&h264-profile=high,main,baseline,constrainedbaseline&h264-level=42&aac-audiochannels=2&TranscodeReasons=VideoBitrateNotSupported

 

Sound like it may be related to this topic in the way the device is identified.

 

https://emby.media/community/index.php?/topic/71442-bug-4k-hdr-20-aac-to-chromecast-ultra-transcoded-when-should-direct-play/?hl=%2Bchromecast+%2Bultra

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dasfox

Yeah, I have a TV similar to that with a built-in one. That was what I thought that it was it not advertising what media types it can support. I just don't understand how Plex can know how to direct play the content though.

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Happy2Play

I can only assume a different identification method.

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dasfox

Just adding for anyone that finds this thread with the same problem, my workaround is that I made a user for the chromecast where I disabled video transcoding and just cast with that account so I get direct play.

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  • 2 weeks later...

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