Cette page présente des exemples de configuration pour l'encodage d'un fichier multimédia d'entrée (c'est-à-dire un ElementaryStream).
Flux vidéo
Les propriétés VideoStream n'ont pas de dépendances les unes envers les autres. Vous pouvez définir des propriétés telles que la résolution (hauteur et largeur), le débit et la fréquence d'images indépendamment.
{
"videoStream": {
"h264": {
"profile": "high",
"preset": "veryfast",
"heightPixels": 360,
"widthPixels": 640,
"pixelFormat": "yuv420p",
"bitrateBps": 550000,
"rateControlMode": "vbr",
"crfLevel": 21,
"vbvSizeBits": 550000,
"vbvFullnessBits": 495000,
"gopDuration": "3s",
"entropyCoder": "cabac",
"bFrameCount": 3,
"frameRate": 30,
"aqStrength": 1
}
},
"key": "video-stream0"
}
Flux audio
Certaines propriétés AudioStream dépendent les unes des autres. La valeur de la propriété channelCount doit être égale au nombre de dispositions dans le tableau channelLayout. Cette valeur doit également correspondre au nombre de canaux dans un flux d'entrée mappé.
Flux audio de base
Voici un exemple de flux audio non mappé et non mixé.
{
"audioStream": {
"codec": "aac",
"bitrateBps": 64000,
"channelCount": 2,
"channelLayout": [
"fl",
"fr"
],
"sampleRateHertz": 48000,
"languageCode": "en-US",
"displayName": "English"
},
"key": "audio-stream0"
}
Flux audio avec mise en correspondance
Voici un exemple de flux audio mappé d'entrée. Le signal stéréo AudioStream de sortie est composé des entrées suivantes :
- Piste 1
- Canal 0
- Piste 1
- Canal 1
Notez que la valeur de la propriété channelCount doit être égale au nombre d'objets défini sous mapping, chacun avec son propre outputChannel.
{
"key": "audio-stream0",
"audioStream": {
"codec": "aac",
"bitrateBps": 64000,
"channelCount": 2,
"channelLayout": [
"fl",
"fr"
],
"sampleRateHertz": 48000,
"languageCode": "en-US",
"displayName": "English",
"mapping": [
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 1,
"inputChannel": 0,
"outputChannel": 0,
"gainDb": 0
},
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 1,
"inputChannel": 1,
"outputChannel": 1,
"gainDb": 0
}
]
}
}
Flux audio avec mixage
Voici un exemple de flux audio avec mixage. Le signal stéréo AudioStream de sortie est composé des entrées suivantes :
- Piste 2
- Canal 0
- Canal 2
- Canal 4
- Piste 2
- Canal 1
- Canal 3
- Canal 5
{
"key": "audio-stream0",
"audioStream": {
"codec": "aac",
"bitrateBps": 128000,
"channelCount": 2,
"mapping": [
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 2,
"inputChannel": 0,
"outputChannel": 0,
"gainDb": 0
},
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 2,
"inputChannel": 2,
"outputChannel": 0,
"gainDb": 0
},
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 2,
"inputChannel": 4,
"outputChannel": 0,
"gainDb": 0
},
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 2,
"inputChannel": 1,
"outputChannel": 1,
"gainDb": 0
},
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 2,
"inputChannel": 3,
"outputChannel": 1,
"gainDb": 0
},
{
"atomKey": "atom0",
"inputKey": "video_and_stereo_audio",
"inputTrack": 2,
"inputChannel": 5,
"outputChannel": 1,
"gainDb": 0
}
],
"sampleRateHertz": 44100
}
}
Flux de texte
Les propriétés TextStream n'ont pas de dépendances les unes envers les autres. Vous pouvez définir les propriétés indépendamment.
Les flux de texte peuvent utiliser une liste d'édition pour modifier le fichier de sortie. Les sections suivantes mettent en évidence l'utilisation de la liste d'édition pour fournir des sous-titres.
L'exemple suivant montre un flux de texte avec un élément atom dans la liste d'édition.
{
"editList":[
{
"key":"atom0",
"inputs":[
"video_input0",
"caption_input0"
],
"startTimeOffset":"0s",
"endTimeOffset":"300s"
}
],
"elementaryStreams":[
{
"key": "cea-stream0",
"textStream": {
"codec": "cea708",
"languageCode": "en-US",
"displayName": "English",
"mapping": [
{
"atomKey": "atom0",
"inputKey": "caption_input0",
"inputTrack": 0
}
]
}
}
]
}
L'exemple suivant montre un flux de texte avec deux éléments atom dans la liste d'édition.
{
"editList":[
{
"key":"atom0",
"inputs":[
"video_input0",
"caption_input0"
],
"startTimeOffset":"0s",
"endTimeOffset":"300s"
},
{
"key":"atom1",
"inputs":[
"video_input1",
"caption_input1"
],
"startTimeOffset":"0s",
"endTimeOffset":"300s"
}
],
"elementaryStreams":[
{
"key": "cea-stream0",
"textStream": {
"codec": "cea708",
"languageCode": "en-US",
"displayName": "English",
"mapping": [
{
"atomKey": "atom0",
"inputKey": "caption_input0",
"inputTrack": 0
},
{
"atomKey": "atom1",
"inputKey": "caption_input1",
"inputTrack": 0
}
]
}
}
]
}
Avancé
Les sections suivantes décrivent diverses configurations avancées.
Sortie audio uniquement
La configuration suivante génère des fichiers MP4 et TS audio uniquement.
{
"config": {
"inputs": [
{
"key": "input0",
"uri": "gs://STORAGE_BUCKET_NAME/STORAGE_INPUT_VIDEO"
}
],
"elementaryStreams": [
{
"key": "audio-stream0",
"audioStream": {
"codec": "aac",
"bitrateBps": 64000,
"languageCode": "en-US",
"displayName": "English"
}
}
],
"muxStreams": [
{
"key": "audio-only-ts",
"fileName": "audio-only.ts",
"container": "ts",
"elementaryStreams": [
"audio-stream0"
]
},
{
"key": "audio-only-mp4",
"fileName": "audio-only.mp4",
"container": "mp4",
"elementaryStreams": [
"audio-stream0"
]
}
],
"manifests": [
{
"fileName": "manifest.m3u8",
"type": "HLS",
"muxStreams": [
"audio-only-ts"
]
}
],
"output": {
"uri": "gs://STORAGE_BUCKET_NAME/STORAGE_OUTPUT_FOLDER/"
}
}
}
MuxStream et fmp4
Un MuxStream qui utilise le conteneur fmp4 ne peut contenir qu'un seul flux ElementaryStream.
Pour ce conteneur, utilisez deux flux MuxStreams : un pour l'audio et un pour la vidéo :
"muxStreams":[
{
"key": "hd3-video",
"container": "fmp4",
"elementaryStreams":["video-stream1"]
},
{
"key": "hd3-audio",
"container": "fmp4",
"elementaryStreams":["audio-stream1"]
}
],
Réutiliser des flux dans plusieurs fichiers manifestes
L'exemple de configuration suivant montre deux encodages vidéo et un encodage audio utilisés dans les fichiers manifestes HLS et DASH :
{
"config": {
"inputs": [
{
"key": "input0",
"uri": "gs://STORAGE_BUCKET_NAME/STORAGE_INPUT_VIDEO"
}
],
"elementaryStreams": [
{
"videoStream": {
"h264": {
"heightPixels": 360,
"widthPixels": 640,
"bitrateBps": 500000,
"frameRate": 30
}
},
"key": "video-stream0"
},
{
"videoStream": {
"h264": {
"heightPixels": 720,
"widthPixels": 1280,
"bitrateBps": 3200000,
"frameRate": 30
}
},
"key": "video-stream1"
},
{
"audioStream": {
"codec": "aac",
"bitrateBps": 64000,
"sampleRateHertz": 48000
},
"key": "audio-stream0"
}
],
"muxStreams": [
{
"key": "video-only-sd",
"container": "fmp4",
"elementaryStreams": [
"video-stream0"
]
},
{
"key": "video-only-hd",
"container": "fmp4",
"elementaryStreams": [
"video-stream1"
]
},
{
"key": "audio-only",
"container": "fmp4",
"elementaryStreams": [
"audio-stream0"
]
}
],
"manifests": [
{
"fileName": "manifest.m3u8",
"type": "HLS",
"muxStreams": [
"video-only-sd",
"video-only-hd",
"audio-only"
]
},
{
"fileName": "manifest.mpd",
"type": "DASH",
"muxStreams": [
"video-only-sd",
"video-only-hd",
"audio-only"
]
}
],
"output": {
"uri": "gs://STORAGE_BUCKET_NAME/STORAGE_OUTPUT_FOLDER/"
}
}
}
Paramètres recommandés pour le transcodage de plusieurs profils
Pour la résolution de sortie et le débit, en fonction de la résolution d'entrée/de la fréquence d'images (50/60 FPS), ajoutez la valeur de fréquence d'images la plus élevée pour 50/60 FPS, le cas échéant. Notez que l'ajout d'étapes supplémentaires nécessite davantage de puissance de calcul. Voici l'échelle recommandée:
| Résolution (ScanMode)/Fréquence d'images | Débit H.264 élevé (kbit/s) |
|---|---|
| 170x96 p12/15 | 130 |
| 256x144 p25/30 | 240 |
| 416x234 p25/30 | 300 |
| 640x360 p25/30 | 400 |
| 768x432 p25/30 | 750 |
| 768x432 p25/30 | 1100 |
| 960 x 540, 25/30 | 2200 |
| 1280x720 p25/30 | 3300 |
| 1280x720 p50/60 | 5500 |
| 1920x1080 p25/30 | 6 000 |
| 1920x1080 p50/60 | 9000 |
Pour les contenus audio, les recommandations sont basées sur le nombre de canaux:
| Canaux | Débit AAC (kbit/s) |
|---|---|
| 2.0 | 64 |
| 2.0 | 160 |
| 5,1 | 384 |
Utilisez cette échelle de sortie pour créer une configuration qui génère des fichiers manifestes HLS et MPEG-DASH avec différentes combinaisons:
{
"config": {
"inputs": [
{
"key": "input0",
"uri": "gs://my-bucket/input0.mp4"
}
],
"elementaryStreams": [
{
"key": "video-stream0",
"videoStream": {
"h264": {
"heightPixels": 96,
"widthPixels": 170,
"bitrateBps": 130000,
"frameRate": 15,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream1",
"videoStream": {
"h264": {
"heightPixels": 144,
"widthPixels": 256,
"bitrateBps": 240000,
"frameRate": 30,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream2",
"videoStream": {
"h264": {
"heightPixels": 234,
"widthPixels": 416,
"bitrateBps": 300000,
"frameRate": 30,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream3",
"videoStream": {
"h264": {
"heightPixels": 360,
"widthPixels": 640,
"bitrateBps": 400000,
"frameRate": 30,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream4",
"videoStream": {
"h264": {
"heightPixels": 432,
"widthPixels": 768,
"bitrateBps": 1100000,
"frameRate": 30,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream5",
"videoStream": {
"h264": {
"heightPixels": 540,
"widthPixels": 960,
"bitrateBps": 2200000,
"frameRate": 30,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream6",
"videoStream": {
"h264": {
"heightPixels": 720,
"widthPixels": 1280,
"bitrateBps": 3300000,
"frameRate": 30,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream7",
"videoStream": {
"h264": {
"heightPixels": 720,
"widthPixels": 1280,
"bitrateBps": 5500000,
"frameRate": 60,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 6,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream8",
"videoStream": {
"h264": {
"heightPixels": 1080,
"widthPixels": 1920,
"bitrateBps": 6000000,
"frameRate": 30,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 3,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "video-stream9",
"videoStream": {
"h264": {
"heightPixels": 1080,
"widthPixels": 1920,
"bitrateBps": 9000000,
"frameRate": 60,
"gopDuration": "4.0s",
"pixelFormat": "yuv420p",
"rateControlMode": "crf",
"crfLevel": 10,
"bFrameCount": 6,
"profile": "high",
"enableTwoPass": true,
"preset": "medium"
}
}
},
{
"key": "audio-stream0",
"audioStream": {
"codec": "aac",
"bitrateBps": 32000
}
},
{
"key": "audio-stream1",
"audioStream": {
"codec": "aac",
"bitrateBps": 64000
}
},
{
"key": "audio-stream2",
"audioStream": {
"codec": "aac",
"bitrateBps": 96000
}
},
{
"key": "audio-stream3",
"audioStream": {
"codec": "aac",
"bitrateBps": 128000
}
},
{
"key": "audio-stream4",
"audioStream": {
"codec": "aac-he",
"bitrateBps": 160000
}
},
{
"key": "audio-stream5",
"audioStream": {
"codec": "aac-he-v2",
"bitrateBps": 384000
}
}
],
"muxStreams": [
{
"key": "1",
"container": "ts",
"elementaryStreams": [
"video-stream0",
"audio-stream0"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "2",
"container": "ts",
"elementaryStreams": [
"video-stream1",
"audio-stream0"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "3",
"container": "ts",
"elementaryStreams": [
"video-stream2",
"audio-stream1"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "4",
"container": "ts",
"elementaryStreams": [
"video-stream3",
"audio-stream1"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "5",
"container": "ts",
"elementaryStreams": [
"video-stream4",
"audio-stream2"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "6",
"container": "ts",
"elementaryStreams": [
"video-stream5",
"audio-stream3"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "7",
"container": "ts",
"elementaryStreams": [
"video-stream6",
"audio-stream3"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "8",
"container": "ts",
"elementaryStreams": [
"video-stream7",
"audio-stream4"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "9",
"container": "ts",
"elementaryStreams": [
"video-stream8",
"audio-stream4"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "10",
"container": "ts",
"elementaryStreams": [
"video-stream9",
"audio-stream5"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-1",
"container": "fmp4",
"elementaryStreams": [
"video-stream0"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-2",
"container": "fmp4",
"elementaryStreams": [
"video-stream1"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-3",
"container": "fmp4",
"elementaryStreams": [
"video-stream2"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-4",
"container": "fmp4",
"elementaryStreams": [
"video-stream3"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-5",
"container": "fmp4",
"elementaryStreams": [
"video-stream4"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-6",
"container": "fmp4",
"elementaryStreams": [
"video-stream5"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-7",
"container": "fmp4",
"elementaryStreams": [
"video-stream6"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-8",
"container": "fmp4",
"elementaryStreams": [
"video-stream7"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-9",
"container": "fmp4",
"elementaryStreams": [
"video-stream8"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "video-10",
"container": "fmp4",
"elementaryStreams": [
"video-stream9"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "audio-1",
"container": "fmp4",
"elementaryStreams": [
"audio-stream0"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "audio-2",
"container": "fmp4",
"elementaryStreams": [
"audio-stream1"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "audio-3",
"container": "fmp4",
"elementaryStreams": [
"audio-stream2"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "audio-4",
"container": "fmp4",
"elementaryStreams": [
"audio-stream3"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "audio-5",
"container": "fmp4",
"elementaryStreams": [
"audio-stream4"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
},
{
"key": "audio-6",
"container": "fmp4",
"elementaryStreams": [
"audio-stream5"
],
"segmentSettings": {
"segmentDuration": "4.0s",
"individualSegments": true
}
}
],
"manifests": [
{
"fileName": "manifest.m3u8",
"type": "HLS",
"muxStreams": [
"10",
"9",
"8",
"7",
"6",
"5",
"4",
"3",
"2",
"1"
]
},
{
"fileName": "manifest.mpd",
"type": "DASH",
"muxStreams": [
"video-10",
"video-9",
"video-8",
"video-7",
"video-6",
"video-5",
"video-4",
"video-3",
"video-2",
"video-1",
"audio-6",
"audio-5",
"audio-4",
"audio-3",
"audio-2",
"audio-1"
]
}
],
"output": {
"uri": "gs://STORAGE_BUCKET_NAME/STORAGE_OUTPUT_FOLDER/"
}
}
}