MP4 Container
H264 High Profile (no B frames please)
AAC LC multiple audio tracks with multiple channels per track supported
Encoders Rule of Thumb: your resulting video file must be playable at least in Chrome on a desktop computer, best if it plays in Safari, Firefox and IE (latest versions)
MP4
https://en.wikipedia.org/wiki/MPEG-4_Part_14
Fast start option enabled (moov header at the beginning of the file)
One video track
Resolution: preserve original resolution
Display Aspect Ratio: preserve original
Pixel Aspect Ratio: square pixel 1:1
Original Display Aspect Ratio: 16:9
Original Encoded resolution: 1920x1080
Original Pixel Aspect Ratio: 1:1
Output Display Aspect Ratio: 16:9
Output Encoded resolution: 1920x1080
Output Pixel Aspect Ratio: 1:1
Original Display Aspect Ratio: 16:9
Original Encoded resolution: 640x480
Original Pixel Aspect Ratio: 4:3
Output Display Aspect Ratio: 16:9
Output Encoded resolution: 854x480
Output Pixel Aspect Ratio: 1:1
FPS: Preserve original
Edit list: no edit list
h264 Main or High Profile with no B-frames exception
Chroma format YUV420P only
No interlaced encoding, please use deinterlacer (yadif or similar recommended)
GOP size 5 seconds (120 for 24fps, 150 for 30fps)
Constant Quality set to 23 if x264 encoder used or similar visual quality setting
Refer to http://slhck.info/articles/crf
Since bitrate values heavily depend on encoder used we do not specify suggested bit rates on purpose.
Instead we recommend using Constant Quality
In simple words it says to encoder: "i want the picture to look this good (X%), do whatever you need to achieve this goal", a VBR in a sense
Consider the following example:
You have 10 seconds of black frames followed by 10 seconds of action scene.
If you encoded both at 5Mbps it would be a waste of bandwidth for blacks and not enough bits for action scene.
Another reason for not specifying the bitrate is to let client choose their own quality setting.
AAC LC (low complexity) profile
Several tracks supported
Example:
Track 1: 5.1 AAC audio Full mix English (US)
Track 2: Stereo AAC audio Full mix Japanese
Track 3: Mono AAC Dialogue
Track 4: Mono AAC Effects
All channels in all tracks should have appropriate channel labels (e.g. Left, Right, LFE, Right Surround, etc)
Timecode track if available in original but not required
video.mov - full res I-frame only h264 Main/High Profile GOP 1
thumbhq.mov - low res 512x288 h264 Main/High no B-frames GOP 25
thumbs.mov - super low res 144x80 h264 Baseline GOP 1
audio.js - JSON file, audio metadata
audio.mp3 - 128k stereo downmix mp3 file, no metadata
c00.wav - c99.wav - demuxed channels of uncompressed audio - on wav file per channel
Video track + timecode track. Purpose: hi-res streaming (to work with event tracks) Optimized for frame-precise seeking
Filename: video.mov
MOV
Fast start option enabled (moov header at the beginning of the file)
One video track
No audio track
Optional Timecode track
FPS: Preserve original
Edit list: no edit list
Preserve original resolution
Display Aspect Ratio: preserve original
Pixel Aspect Ratio: square pixel 1:1
Original Display Aspect Ratio: 16:9
Original Encoded resolution: 1920x1080
Original Pixel Aspect Ratio: 1:1
Output Display Aspect Ratio: 16:9
Output Encoded resolution: 1920x1080
Output Pixel Aspect Ratio: 1:1
Original Display Aspect Ratio: 16:9
Original Encoded resolution: 640x480
Original Pixel Aspect Ratio: 4:3
Output Display Aspect Ratio: 16:9
Output Encoded resolution: 854x480
Output Pixel Aspect Ratio: 1:1
h264 Main or High Profile with no B-frames exception
Chroma format YUV420P only
No interlaced encoding, please use deinterlacer (yadif or similar recommended)
GOP size 1 (I-Frame only)
Bitrate: Constant Quality set to 23 if x264 encoder used or similar visual quality setting
Refer to http://slhck.info/articles/crf
Video track only low resolution video is needed to enable fast seeking within movie, often used instead of video.mov to decrease network bandwidth required. Required for low-res streaming (i.e. previews) Optimized for frame-precise seeking
Filename: thumbshq.mov
MOV
Fast start option enabled (moov header at the beginning of the file)
One video track
No audio track
Optional Timecode track
FPS: Preserve original
Edit list: no edit list
512x288
Display Aspect Ratio: preserve original
Pixel Aspect Ratio: square pixel 1:1
h264 Main or High Profile with no B-frames exception
Chroma format YUV420P only
No interlaced encoding, please use deinterlacer (yadif or similar recommended)
GOP size 25
Bitrate: Constant Quality set to 23 if x264 encoder used or similar visual quality setting
Refer to http://slhck.info/articles/crf
Super low resolution video-only proxy needed to create UI previews of current movie and render filmstrip
Filename: thumbs.mov
MOV
Fast start option enabled (moov header at the beginning of the file)
One video track
No audio track
No timecode track
FPS: Preserve original
Edit list: no edit list
144x80
Display Aspect Ratio: preserve original
Pixel Aspect Ratio: square pixel 1:1
h264 Baseline profile
Chroma format YUV420P only
No interlaced encoding, please use deinterlacer (yadif or similar recommended)
GOP size 1
Bitrate: Constant Quality set to 23 if x264 encoder used or similar visual quality setting capped at 200kbit/sec
Refer to http://slhck.info/articles/crf
JSON file containing audio metadata.
Filename: audio.js
Example
{
"audioType": "wavs",
"channelCount": 2,
"sampleRate": 48000,
"totalSamples": 309477169,
"channelLabels": ["front left", "front right"]
}audioType - "wavs" for separate .wav per channel, "mp3" for stereo downmix
channelCount - number of channels. 2 for stereo, etc
sampleRate - audio sample rate
totalSamples - total number of audio samples in a single channel. For example 2 seconds at 48000Hz comprise 96000 samples
channelLabels - channel labels
An MP3 file containing all audio channels muxed into 16bit stereo. Optimized for quick random access during playback.
Filename: audio.mp3
Container: MP3
Codec: MP3
Channels: 2 channels
Sample rate: 48khz
Bitrate: 128kbps CBR
Metadata: no metadata, no tags or other non-audio packets
Encoder settings: no bit reservoir
One channel per file. Needed to enable the feature to mute/unmute individual audio channels during playback
Filename: c<channel_number>.wav e.g. c00.wav
Container: WAV (RF64 supported)
Codec: Signed PCM
Bit depth: preserve original (16bit preferred)
Sample rate: preserve original
Metadata: Preserve original channel labels (e.g. Left, Right, LFE, Center etc)
Both DASH and HLS proxies contain high res and low res video streams, DASH additionally caries thumbnail video stream for on the fly filmstrip generation.
Standards compliant DASH/HLS container is supported.
We strongly recommend choosing DASH/HLS chunk size of 5 seconds, however any chunk size is supported.
Dynamic Audio/Video switching implies audio and video tracks are separate.
<MPD type="dynamic" minBufferTime="PT5.0S" profiles="urn:mpeg:dash:profile:isoff-live:2011" mediaPresentationDuration="PT5.0S" availabilityStartTime="2016-05-17T13:01:15Z" minimumUpdatePeriod="PT500S" suggestedPresentationDelay="PT5S" publishTime="2016-05-17T13:01:25Z" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:mpeg:dash:schema:mpd:2011">
<Period start="PT0.0S">
<AdaptationSet segmentAlignment="true" bitstreamSwitching="true" contentType="video">
<Representation id="2" mimeType="video/mp4" codecs="avc1.42c00a" width="144" height="80" frameRate="24000/1001" bandwidth="186534">
<SegmentTemplate timescale="24000" media="stream-$RepresentationID$.$Number$.m4s" startNumber="1" initialization="stream-$RepresentationID$.0.m4s">
<SegmentTimeline>
<S t="0" d="121121" r="0"/>
</SegmentTimeline>
</SegmentTemplate>
</Representation>
<Representation id="1" mimeType="video/mp4" codecs="avc1.640015" width="512" height="288" frameRate="24000/1001" bandwidth="450479">
<SegmentTemplate timescale="24000" media="stream-$RepresentationID$.$Number$.m4s" startNumber="1" initialization="stream-$RepresentationID$.0.m4s">
<SegmentTimeline>
<S t="0" d="121121" r="0"/>
</SegmentTimeline>
</SegmentTemplate>
</Representation>
<Representation id="0" mimeType="video/mp4" codecs="avc1.64001f" width="1146" height="646" frameRate="24000/1001" bandwidth="2729706">
<SegmentTemplate timescale="24000" media="stream-$RepresentationID$.$Number$.m4s" startNumber="1" initialization="stream-$RepresentationID$.0.m4s">
<SegmentTimeline>
<S t="0" d="121121" r="0"/>
</SegmentTimeline>
</SegmentTemplate>
</Representation>
</AdaptationSet>
<AdaptationSet segmentAlignment="true" bitstreamSwitching="true" contentType="audio">
<Representation id="3" mimeType="audio/mp4" codecs="mp4a.40.2" audioSamplingRate="48000" bandwidth="192612">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"/>
<SegmentTemplate timescale="48000" media="stream-$RepresentationID$.$Number$.m4s" startNumber="1" initialization="stream-$RepresentationID$.0.m4s">
<SegmentTimeline>
<S t="0" d="240640" r="0"/>
<S d="239616" r="0"/>
</SegmentTimeline>
</SegmentTemplate>
</Representation>
</AdaptationSet>
</Period>
</MPD>HLS Stream variants
#EXTM3U
#EXT-X-VERSION:4
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_group",NAME="audio-v4219",URI="stream-2.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=2813569,RESOLUTION=1146x646,AUDIO="audio_group"
stream-0.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=490832,RESOLUTION=510x288,AUDIO="audio_group"
stream-1.m3u8
HLS Playlist
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:5
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:4.99200,
stream-2.0.ts
#EXTINF:4.97067,
stream-2.1.ts
#EXT-X-ENDLIST
Same as Generic Proxy Video
Same as VGProxy Pro Low Res video
Same as VGProxy Pro Thumbnails
Same as Generic Proxy Audio