视频播放分辨率不符合预期

[amtoaer]

尝试点开一个 4k 电影播放，发现 mpv 中视频分辨率相当低，但 emby 控制台显示的是直接播放。

之前没有用过 mpv，不清楚是 mpv 配置问题还是项目问题，提个 issue 寻求帮助（

[tsukinaha]

@amtoaer 怎么拿到的是 m3u8 ，看一眼媒体信息？

[Kosette]

看一下emby server是否开启了transcoding，如果强制关闭还有没有这样的情况。

[amtoaer]

好的，我的机器在公司，明天看一下，感谢

[ZBound]

转码需要在单个用户配置中关闭，需要注意一下

[amtoaer]

刚刚试过了，在单个用户配置内关闭转码可以 work。
不过我在 mac 上使用 infuse 可以在不调整用户配置的前提下做到直接播放不转码，因此这可能是一个客户端能够设置的属性？
我看到视频播放参数中有“TranscodeReasons=ContainerBitrateExceedsLimit”字样，在 jellyfin 社区发现了一个相关问题，回复指出用户后台将比特率配置为“自动”时在Android TV 上可能会错误地将比特率设置的非常低（想了想感觉也可能是我公网访问 NAS 连接状态不太好），可以通过手动切换比特率实现。

[tsukinaha]

@amtoaer 怀疑可能是请求体中的 MaxStaticBitrate:140000000 MaxStreamingBitrate:140000000 导致了转码
尝试一下把这几项调高看看有用吗

[amtoaer]

刚刚尝试提高到了一个很高的值，还是不行，不过确实感觉是这个参数的影响。我看到里面有一个 DirectPlayProfiles，里面没有包含 h265，所以有点怀疑是这个导致 hevc 视频走到转码了，不过要先工作，没时间调了（
下面是这个电影的参数：

等我有时间可以看看接口文档尝试修一下，或者也可以给你开一个 emby 账号你来试试（

[Kosette]

Emby的转码跟这几个因素有关：bitrate、videocodec、audiocodec、subtitleformat，详细的设置需要测试。

• bitrate： 要避免转码bitrate不能设置太低，官方的推荐是设置为Auto，这个可能是根据/Playback/BitrateTest的结果动态生成的profile

• directplay profiles：因为使用libmpv播放，所以这一块可以参考FFmpeg编码器规格，原则上几乎支持市面上大部分的编码，所以directplay profiles部分可以把常见的container、videocodec和audiocodec都写上去。

• transcoding profiles：这一部分按照luke的说法，会优先使用codec profiles中第一个video、audio的设置，因此避免转码之后的串流太糊，需要把codec profiles中width设置的稍微大一点，比如

{
  "Type": "Video",
  "Codec": "h264",
  "Conditions": [
    {
      "Condition": "EqualsAny",
      "Property": "VideoProfile",
      "Value": "high|main|baseline|constrained baseline",
      "IsRequired": false
    },
    {
      "Condition": "LessThanEqual",
      "Property": "VideoLevel",
      "Value": "52",
      "IsRequired": false
    },
    {
      "Condition": "LessThanEqual",
      "Property": "Width",
      "Value": "1920",         <-------
      "IsRequired": false
    }
  ]
}

• subtitle：字幕方面基本主流的srt、ass、ssa、pgssub都支持的，这一块不确定是否需要指定。

[amtoaer]

想到之前有用过一个开源的 jellyfin 客户端 findroid，去看了看他的源码。他采取的策略是 direct play only，具体设置是这样的：

https://github.com/jarnedemeulemeester/findroid/blob/a743363a8765e9fa159359a06df0f4b03e91f22a/data/src/main/java/dev/jdtech/jellyfin/repository/JellyfinRepositoryImpl.kt#L288

emby 和 jellyfin 在这方面应该差距不大，如果我们也打算仅支持 direct play 的话，可以将这个设置作为参考。

[ZBound]

我认为转码的作用：
一是为了让某些软硬件支持一些特殊媒体流；
二是为了降低分辨率和码率使其对带宽要求降低。

前者因为是桌面端软件且使用libmpv，解码不了的媒体流应该是少数；
后者的话根据 YD/T 3328-2023 标准就算是家宽上行一般也有 30-40Mbit/s，几乎可以看大部分4k以内非原盘和Remux，况且还有使用vps搭建的方案。

我认为 direct play only 没什么问题。

[tsukinaha]

不打算做转码。
如果有合适的参数欢迎直接 pr

[Kosette]

@amtoaer 方便的话麻烦测试一下这个profile。 https://pastebin.com/dh9Ap8uv
具体需要修改这两行。

tsukimi/src/ui/network.rs

Line 704 in cf8082d

let profile = serde_json::json!({"DeviceProfile":{"MaxStaticBitrate":140000000,"MaxStreamingBitrate":140000000,"MusicStreamingTranscodingBitrate":192000,"DirectPlayProfiles":[{"Container":"mp4,m4v","Type":"Video","VideoCodec":"h264,av1,vp8,vp9","AudioCodec":"aac,opus,flac,vorbis"},{"Container":"flv","Type":"Video","VideoCodec":"h264","AudioCodec":"aac,mp3"},{"Container":"mov","Type":"Video","VideoCodec":"h264","AudioCodec":"aac,opus,flac,vorbis"},{"Container":"opus","Type":"Audio"},{"Container":"mp3","Type":"Audio","AudioCodec":"mp3"},{"Container":"mp2,mp3","Type":"Audio","AudioCodec":"mp2"},{"Container":"m4a","AudioCodec":"aac","Type":"Audio"},{"Container":"mp4","AudioCodec":"aac","Type":"Audio"},{"Container":"flac","Type":"Audio"},{"Container":"webma,webm","Type":"Audio"},{"Container":"wav","Type":"Audio","AudioCodec":"PCM_S16LE,PCM_S24LE"},{"Container":"ogg","Type":"Audio"},{"Container":"webm","Type":"Video","AudioCodec":"vorbis,opus","VideoCodec":"av1,VP8,VP9"}],"TranscodingProfiles":[{"Container":"aac","Type":"Audio","AudioCodec":"aac","Context":"Streaming","Protocol":"hls","MaxAudioChannels":"2","MinSegments":"1","BreakOnNonKeyFrames":true},{"Container":"aac","Type":"Audio","AudioCodec":"aac","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"mp3","Type":"Audio","AudioCodec":"mp3","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"opus","Type":"Audio","AudioCodec":"opus","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"wav","Type":"Audio","AudioCodec":"wav","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"opus","Type":"Audio","AudioCodec":"opus","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"mp3","Type":"Audio","AudioCodec":"mp3","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"aac","Type":"Audio","AudioCodec":"aac","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"wav","Type":"Audio","AudioCodec":"wav","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"m4s,ts","Type":"Video","AudioCodec":"aac","VideoCodec":"h264","Context":"Streaming","Protocol":"hls","MaxAudioChannels":"2","MinSegments":"1","BreakOnNonKeyFrames":true,"ManifestSubtitles":"vtt"},{"Container":"webm","Type":"Video","AudioCodec":"vorbis","VideoCodec":"vpx","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"mp4","Type":"Video","AudioCodec":"aac,opus,flac,vorbis","VideoCodec":"h264","Context":"Static","Protocol":"http"}],"ContainerProfiles":[],"CodecProfiles":[{"Type":"VideoAudio","Codec":"aac","Conditions":[{"Condition":"Equals","Property":"IsSecondaryAudio","Value":"false","IsRequired":"false"}]},{"Type":"VideoAudio","Conditions":[{"Condition":"Equals","Property":"IsSecondaryAudio","Value":"false","IsRequired":"false"}]},{"Type":"Video","Codec":"h264","Conditions":[{"Condition":"EqualsAny","Property":"VideoProfile","Value":"high|main|baseline|constrained baseline","IsRequired":false},{"Condition":"LessThanEqual","Property":"VideoLevel","Value":"52","IsRequired":false},{"Condition":"LessThanEqual","Property":"Width","Value":"1280","IsRequired":false}]},{"Type":"Video","Codec":"hevc","Conditions":[{"Condition":"LessThanEqual","Property":"Width","Value":"1280","IsRequired":false}]},{"Type":"Video","Conditions":[{"Condition":"LessThanEqual","Property":"Width","Value":"1280","IsRequired":false}]}],"SubtitleProfiles":[{"Format":"vtt","Method":"Hls"},{"Format":"eia_608","Method":"VideoSideData","Protocol":"hls"},{"Format":"eia_708","Method":"VideoSideData","Protocol":"hls"},{"Format":"vtt","Method":"External"},{"Format":"ass","Method":"External"},{"Format":"ssa","Method":"External"}],"ResponseProfiles":[{"Type":"Video","Container":"m4v","MimeType":"video/mp4"}]}});

tsukimi/src/ui/network.rs

Line 667 in cf8082d

let profile = serde_json::json!({"DeviceProfile":{"MaxStaticBitrate":140000000,"MaxStreamingBitrate":140000000,"MusicStreamingTranscodingBitrate":192000,"DirectPlayProfiles":[{"Container":"mp4,m4v","Type":"Video","VideoCodec":"h264,av1,vp8,vp9","AudioCodec":"aac,opus,flac,vorbis"},{"Container":"flv","Type":"Video","VideoCodec":"h264","AudioCodec":"aac,mp3"},{"Container":"mov","Type":"Video","VideoCodec":"h264","AudioCodec":"aac,opus,flac,vorbis"},{"Container":"opus","Type":"Audio"},{"Container":"mp3","Type":"Audio","AudioCodec":"mp3"},{"Container":"mp2,mp3","Type":"Audio","AudioCodec":"mp2"},{"Container":"m4a","AudioCodec":"aac","Type":"Audio"},{"Container":"mp4","AudioCodec":"aac","Type":"Audio"},{"Container":"flac","Type":"Audio"},{"Container":"webma,webm","Type":"Audio"},{"Container":"wav","Type":"Audio","AudioCodec":"PCM_S16LE,PCM_S24LE"},{"Container":"ogg","Type":"Audio"},{"Container":"webm","Type":"Video","AudioCodec":"vorbis,opus","VideoCodec":"av1,VP8,VP9"}],"TranscodingProfiles":[{"Container":"aac","Type":"Audio","AudioCodec":"aac","Context":"Streaming","Protocol":"hls","MaxAudioChannels":"2","MinSegments":"1","BreakOnNonKeyFrames":true},{"Container":"aac","Type":"Audio","AudioCodec":"aac","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"mp3","Type":"Audio","AudioCodec":"mp3","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"opus","Type":"Audio","AudioCodec":"opus","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"wav","Type":"Audio","AudioCodec":"wav","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"opus","Type":"Audio","AudioCodec":"opus","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"mp3","Type":"Audio","AudioCodec":"mp3","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"aac","Type":"Audio","AudioCodec":"aac","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"wav","Type":"Audio","AudioCodec":"wav","Context":"Static","Protocol":"http","MaxAudioChannels":"2"},{"Container":"m4s,ts","Type":"Video","AudioCodec":"aac","VideoCodec":"h264","Context":"Streaming","Protocol":"hls","MaxAudioChannels":"2","MinSegments":"1","BreakOnNonKeyFrames":true,"ManifestSubtitles":"vtt"},{"Container":"webm","Type":"Video","AudioCodec":"vorbis","VideoCodec":"vpx","Context":"Streaming","Protocol":"http","MaxAudioChannels":"2"},{"Container":"mp4","Type":"Video","AudioCodec":"aac,opus,flac,vorbis","VideoCodec":"h264","Context":"Static","Protocol":"http"}],"ContainerProfiles":[],"CodecProfiles":[{"Type":"VideoAudio","Codec":"aac","Conditions":[{"Condition":"Equals","Property":"IsSecondaryAudio","Value":"false","IsRequired":"false"}]},{"Type":"VideoAudio","Conditions":[{"Condition":"Equals","Property":"IsSecondaryAudio","Value":"false","IsRequired":"false"}]},{"Type":"Video","Codec":"h264","Conditions":[{"Condition":"EqualsAny","Property":"VideoProfile","Value":"high|main|baseline|constrained baseline","IsRequired":false},{"Condition":"LessThanEqual","Property":"VideoLevel","Value":"52","IsRequired":false},{"Condition":"LessThanEqual","Property":"Width","Value":"1280","IsRequired":false}]},{"Type":"Video","Codec":"hevc","Conditions":[{"Condition":"LessThanEqual","Property":"Width","Value":"1280","IsRequired":false}]},{"Type":"Video","Conditions":[{"Condition":"LessThanEqual","Property":"Width","Value":"1280","IsRequired":false}]}],"SubtitleProfiles":[{"Format":"vtt","Method":"Hls"},{"Format":"eia_608","Method":"VideoSideData","Protocol":"hls"},{"Format":"eia_708","Method":"VideoSideData","Protocol":"hls"},{"Format":"vtt","Method":"External"},{"Format":"ass","Method":"External"},{"Format":"ssa","Method":"External"}],"ResponseProfiles":[{"Type":"Video","Container":"m4v","MimeType":"video/mp4"}]}});

[amtoaer]

@Kosette 不行，会挂：

[Kosette]

@amtoaer 我这边没有开了转码的服务器，方便的话可以给我开一个测试账号吗？我这边在没有开启转码的情况下没有复现这个情况

[ZBound]

@Kosette 我记得Nyamedia公益服好像支持转码，你去试试

[amtoaer]

你有 tg 账号吗，可以私聊我一下，我把账号和地址发你： https://t.me/amtoaer 。或者给个邮箱也行。