Did Youtube Removed The 144p 3gp Quality
Media quality on Youtube
Note, this info and assumptions are based on individual observations. Information technology is not claimed to exist comprehensive or accurate.
All popular video sites hold several media files with dissimilar qualities for each clip. Ordinarily these files differ by resolution, in that location are original resolution and several lower resolutions to exist used on smaller screens or to save bandwidth. And then when determining best quality, all other video properties usually can exist ignored.
Youtube goes further and in addition to resolution has several other properties. Combinations of these properties results in a big diverseness of possible qualities.
Each known property is described under own dissever section below.
File formats and codecs
Youtube uses three file formats (or media containers): MP4, WebM and 3GP:
| Media container | Video codec | Sound codec |
|---|---|---|
| MP4 | H.264 (MPEG-4 Function x) | AAC |
| MP4 DASH | H.264 (MPEG-four Part ten) | - |
| MP4 DASH | - | AAC |
| WebM | VP8 | Vorbis |
| WebM DASH | VP9 | - |
| WebM Dash | - | Vorbis |
| WebM Dash | - | Opus |
| 3GP | MPEG-4 Role 2 | AAC |
Additional info about Nuance files you lot tin read on Adaptive streams page.
[Retrospective]. FLV was used by total majority of video sites in the past. Youtube had three qualities with it before adaptive streams advent ([1], [2] 180/240p, 360p, 480p FLV in 2012). After switch to adaptive streams in 2013 there were left only 180/240p [3]. And information technology seems was finally removed from Youtube in Summer 2016 [four], [5].
Video resolution
Qualities listing usually contains all common resolutions from 144p to original video resolution. Maximum possible resolution at this moment is 8k (4320p, 7680×4320 for xvi:ix in ideal case) [6].
In general example every non-low quality is available within both MP4 and WebM formats. Depending on some reasons (like probably clip popularity) WebM adaptive streams may not be bachelor notwithstanding for some clips [seven].
| Video resolution | Media container |
|---|---|
| 240p, 360p, 480p, 720p, 1080p, 1440p, 2160p, 4320p | MP4, WebM |
| 180p | 3GP |
| 144p | 3GP, MP4, WebM |
Regular video files
Since Nuance streams was added, most of regular video qualities (i.e. files containing both video and sound streams) was removed from the site. At present only few of them are available:
| Media container | Video resolution |
|---|---|
| MP4 | 720p, 360p |
| WebM | 360p |
| 3GP | 240p, 144p |
So maximum resolution of regular video file is 720p and simply MP4 no thing of how high is original quality of the clip.
60 FPS
Youtube has support of high FPS (Frames per 2nd) videos. Near common frame rate is sixty FPS [eight], but this depends on original video. For instance it tin can exist 48 FPS if original quality has this frame rate [9].
Non-high fps frame charge per unit i.e. 'normal' frame charge per unit in case of these clips is always high fps value divided past two. And then information technology will be xxx fps for sixty fps original video, 24 fps for 48 fps original video etc.
Video with quality containing high fps is provided only within DASH streams. Its availability also depends on resolution and file format:
| Video resolution | Media container with high fps |
|---|---|
| 4320p | - |
| 1440p-2160p | WebM |
| 720p-1080p | MP4, WebM |
| 144p-480p | - |
So resolutions upwards to 480p do not take high fps. 8k videos currently besides don't take it. As for other resolutions, WebM has high fps for all of them but MP4 has it only for 720p and 1080p [ten].
Soft 3D
Not available anymore equally of summer 2016.
[Retrospective]. Some clips on Youtube amid with video having original paradigm in different resolution also had few media files with 3D video generated from original file. Not to be confused with regular 3D clips which have all medias in 3D, these clips had simply few variants of soft-made 3D.
Usually (or always) there were 360p WebM, 360p MP4 and 720p MP4 ([11], soft 3D marked with greenish circle; the aforementioned clip now: [12]). Stereo pair at that place always had horizontal layout and half-width image size.
Video bitrate
Some clips may accept VO medias with the same resolution, format and codec. The but deviation is bitrate (in example: ii vs iii (15Mbps vs 18 Mbps), 4 vs 5 (22Mbps vs 24 Mbps). This breaks general machine comparing assumption that all videos with the same resolution accept the same quality. However this is notwithstanding rarely seen state of affairs. Video bitrate is yet not used at automated comparing considering higher bitrate does non always hateful improve quality: it is non truthful when comparing codecs from different generations i.due east. h264 with 'adjacent-gen' VP9 which claims the aforementioned quality with lower bitrate.
Sound quality
Nuance audio streams can be freely combined with the video streams thus the audio format and quality besides should be taken into account at selecting output quality. When downloading quality 720p and below, regular video+audio files also might exist selected depending on desired output quality: if at comparing two qualities the video quality is equivalent, the plan compares an sound quality.
Beneath is consummate list of bachelor audio qualities (including audio quality in regular video+audio files) in decreasing order of quality.
| Media container | Sound codec | Channels | Samplerate, Hz | Bitrate, kbps | Video resolution |
|---|---|---|---|---|---|
| MP4 Nuance | AAC | 5.1 | 48000 | 384 | - |
| MP4 Dash | AAC | five.1 | 48000 | 256 | - |
| MP4 Nuance | AAC | 5.1 | 48000 | 192 | - |
| WebM Dash | Vorbis | 4.0 | 48000 | 256 | - |
| MP4 DASH | AAC | Stereo | 44100 | 256 | - |
| MP4 | AAC | Stereo | 44100 | 192 | 720p |
| WebM Nuance | Opus | Stereo | 48000 | 160 | - |
| MP4 DASH | AAC | Stereo | 44100 | 128 | - |
| WebM DASH | Vorbis | Stereo | 44100 | 128 | - |
| WebM | Vorbis | Stereo | 44100 | 128 | 360p |
| MP4 | AAC | Stereo | 44100 | 128 | 360p |
| MP4 | AAC | Stereo | 44100 | 96 | 360p |
| WebM Nuance | Opus | Stereo | 48000 | 64 | - |
| WebM Dash | Opus | Stereo | 48000 | 50 | - |
| FLV | MP3 | Stereo | 22050 | 64 | 240p |
| 3GP | AAC | Mono | 22050 | 32 | 240p |
| 3GP | AAC | Mono | 22050 | 24 | 144p |
Best audio formats bachelor on Youtube are 256kbps AAC in stereo and 384kbps AAC in 5.one. They are available simply within DASH stream.
Note that both MP4 and WebM media containers accept incompatible sound codecs among bachelor audio Dash streams. AAC can be muxed only into MP4 and Vorbis, Opus - into WebM (this is controlled past 'Muxing exceptions' option). So for instance in the clip beneath even if it has 256kbps AAC, the all-time quality is VP9+Opus: at video selection highest priority has video quality so the all-time video is WebM VP9 (2160p 60FPS) and it compatible only with Opus/Vorbis.
[Retrospective]. v.1 384kbps and 192kbps seems are available for clips which was added after 11-xi-2015. 5.1 and 4.0 256kbps appeared a bit later within spatial audio (most spatial audio: 1, 2).
Champion by the number of qualities
Later on adding back up for HDR videos the champion (on 09-Nov-2016) is this clip (forty qualities).
This is not the first time when the prune has 40 qualities. This has happened before due to more qualities containing regular videos and adaptive audios.
Although information technology is not the offset time, it notwithstanding looks impressive:
Notation, formats a1 - a5 are not split files, they are audio streams from regular video files #xix, #26, #27, #31, #35.
You may be likewise interested in ex-champions past the number of qualities.
Source: https://yd.3dyd.com/help/youtube_formats/
Posted by: danielfroldn1985.blogspot.com
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