Szenenwechsel in einer Streamingvideodatei erkennen
Dokumentationsseiten mit diesem Codebeispiel
Die folgenden Dokumente enthalten das Codebeispiel im Kontext:
Codebeispiel
Java
import com.google.api.gax.rpc.BidiStream;
import com.google.cloud.videointelligence.v1p3beta1.StreamingAnnotateVideoRequest;
import com.google.cloud.videointelligence.v1p3beta1.StreamingAnnotateVideoResponse;
import com.google.cloud.videointelligence.v1p3beta1.StreamingFeature;
import com.google.cloud.videointelligence.v1p3beta1.StreamingLabelDetectionConfig;
import com.google.cloud.videointelligence.v1p3beta1.StreamingVideoAnnotationResults;
import com.google.cloud.videointelligence.v1p3beta1.StreamingVideoConfig;
import com.google.cloud.videointelligence.v1p3beta1.StreamingVideoIntelligenceServiceClient;
import com.google.cloud.videointelligence.v1p3beta1.VideoSegment;
import com.google.protobuf.ByteString;
import io.grpc.StatusRuntimeException;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.concurrent.TimeoutException;
class StreamingShotChangeDetection {
// Perform streaming video detection for shot changes
static void streamingShotChangeDetection(String filePath)
throws IOException, TimeoutException, StatusRuntimeException {
// String filePath = "path_to_your_video_file";
try (StreamingVideoIntelligenceServiceClient client =
StreamingVideoIntelligenceServiceClient.create()) {
Path path = Paths.get(filePath);
byte[] data = Files.readAllBytes(path);
// Set the chunk size to 5MB (recommended less than 10MB).
int chunkSize = 5 * 1024 * 1024;
int numChunks = (int) Math.ceil((double) data.length / chunkSize);
StreamingLabelDetectionConfig labelConfig =
StreamingLabelDetectionConfig.newBuilder().setStationaryCamera(false).build();
StreamingVideoConfig streamingVideoConfig =
StreamingVideoConfig.newBuilder()
.setFeature(StreamingFeature.STREAMING_SHOT_CHANGE_DETECTION)
.setLabelDetectionConfig(labelConfig)
.build();
BidiStream<StreamingAnnotateVideoRequest, StreamingAnnotateVideoResponse> call =
client.streamingAnnotateVideoCallable().call();
// The first request must **only** contain the audio configuration:
call.send(
StreamingAnnotateVideoRequest.newBuilder().setVideoConfig(streamingVideoConfig).build());
// Subsequent requests must **only** contain the audio data.
// Send the requests in chunks
for (int i = 0; i < numChunks; i++) {
call.send(
StreamingAnnotateVideoRequest.newBuilder()
.setInputContent(
ByteString.copyFrom(
Arrays.copyOfRange(data, i * chunkSize, i * chunkSize + chunkSize)))
.build());
}
// Tell the service you are done sending data
call.closeSend();
for (StreamingAnnotateVideoResponse response : call) {
StreamingVideoAnnotationResults annotationResults = response.getAnnotationResults();
if (response.hasError()) {
System.out.println(response.getError().getMessage());
System.out.format(
"Error was occured with the following status: %s\n", response.getError());
}
for (VideoSegment segment : annotationResults.getShotAnnotationsList()) {
double startTimeOffset =
segment.getStartTimeOffset().getSeconds()
+ segment.getStartTimeOffset().getNanos() / 1e9;
double endTimeOffset =
segment.getEndTimeOffset().getSeconds() + segment.getEndTimeOffset().getNanos() / 1e9;
System.out.format("Shot: %fs to %fs\n", startTimeOffset, endTimeOffset);
}
}
}
}
}Node.js
/**
* TODO(developer): Uncomment these variables before running the sample.
*/
// const path = 'Local file to analyze, e.g. ./my-file.mp4';
const {StreamingVideoIntelligenceServiceClient} =
require('@google-cloud/video-intelligence').v1p3beta1;
const fs = require('fs');
// Instantiates a client
const client = new StreamingVideoIntelligenceServiceClient();
// Streaming configuration
const configRequest = {
videoConfig: {
feature: 'STREAMING_SHOT_CHANGE_DETECTION',
},
};
const readStream = fs.createReadStream(path, {
highWaterMark: 5 * 1024 * 1024, //chunk size set to 5MB (recommended less than 10MB)
encoding: 'base64',
});
//Load file content
const chunks = [];
readStream
.on('data', chunk => {
const request = {
inputContent: chunk.toString(),
};
chunks.push(request);
})
.on('close', () => {
// configRequest should be the first in the stream of requests
stream.write(configRequest);
for (let i = 0; i < chunks.length; i++) {
stream.write(chunks[i]);
}
stream.end();
});
const stream = client.streamingAnnotateVideo().on('data', response => {
//Gets annotations for video
const annotations = response.annotationResults;
const shotChanges = annotations.shotAnnotations;
console.log(JSON.stringify(shotChanges));
if (shotChanges.length === 1) {
console.log('The entire video is one shot.');
}
shotChanges.forEach(shot => {
console.log(
` Shot: ${shot.startTimeOffset.seconds || 0}` +
`.${(shot.startTimeOffset.nanos / 1e6).toFixed(0)}s to ${
shot.endTimeOffset.seconds || 0
}` +
`.${(shot.endTimeOffset.nanos / 1e6).toFixed(0)}s`
);
});
});Python
from google.cloud import videointelligence_v1p3beta1 as videointelligence
# path = 'path_to_file'
client = videointelligence.StreamingVideoIntelligenceServiceClient()
# Set streaming config.
config = videointelligence.StreamingVideoConfig(
feature=(videointelligence.StreamingFeature.STREAMING_SHOT_CHANGE_DETECTION)
)
# config_request should be the first in the stream of requests.
config_request = videointelligence.StreamingAnnotateVideoRequest(
video_config=config
)
# Set the chunk size to 5MB (recommended less than 10MB).
chunk_size = 5 * 1024 * 1024
# Load file content.
stream = []
with io.open(path, "rb") as video_file:
while True:
data = video_file.read(chunk_size)
if not data:
break
stream.append(data)
def stream_generator():
yield config_request
for chunk in stream:
yield videointelligence.StreamingAnnotateVideoRequest(input_content=chunk)
requests = stream_generator()
# streaming_annotate_video returns a generator.
# The default timeout is about 300 seconds.
# To process longer videos it should be set to
# larger than the length (in seconds) of the stream.
responses = client.streaming_annotate_video(requests, timeout=600)
# Each response corresponds to about 1 second of video.
for response in responses:
# Check for errors.
if response.error.message:
print(response.error.message)
break
for annotation in response.annotation_results.shot_annotations:
start = (
annotation.start_time_offset.seconds
+ annotation.start_time_offset.microseconds / 1e6
)
end = (
annotation.end_time_offset.seconds
+ annotation.end_time_offset.microseconds / 1e6
)
print("Shot: {}s to {}s".format(start, end))Nächste Schritte
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