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Carte de Schillerkiez
13 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
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Sur d’autres sites (10269)
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ffmpeg Get time of frames from trimmed video
17 novembre 2017, par TheOtherguyz4kjI am using FFmpeg in my application to extract frames from a video, the frames will be added to a trim video view where you get an illustration as to what is happening in the video at a specific time within the video. So each frame needs to represent some time within the video.
I dont quite understand how FFmpeg is producing the frames. Here is my code :
"-i",
videoCroppedFile.getAbsolutePath(),
"-vf",
"fps=1/" + frameSeperation,
mediaStorageDir.getAbsolutePath() +
"/%d.jpg"My app allows you to record a video at a max length of 20s. The number of frames extracted from the video depnds on how long the captured video is. frameSeperation is calculated doing the below code.
String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
long videoLength = Long.parseLong(time) / 1000;
double frameSeperationDouble = (double) videoLength;
// Divide by 11 because there is a maximum of 11 frames on trim video view
frameSeperationDouble /= 11;
frameSeperationDouble = Math.ceil(frameSeperationDouble);
int frameSeperation = (int) frameSeperationDouble;Maybe the above logic is very bad, if there is a better way please can somebody tell me.
Anyway I run the code and below are a few test cases :
- A video captured with a length of 6 seconds has 7 frames.
- A video captured with a length of 2 seconds has 3 frames.
- A video captured with a length of 10 seconds has 12 frames.
- A video captured with a length of 15 seconds has 9 frames.
- A video captured with a length of 20 seconds has 11 frames.
There is no consistency, and I find it hard to put timestamps against each frame because of this. I feel like my logic is wrong or im not understanding. Any help is much appreciated
Update 1
So I did what you said in comments :
final FFmpeg ffmpeg = FFmpeg.getInstance(mContext);
final File mediaStorageDir = new File(Environment.getExternalStorageDirectory()
+ "/Android/data/"
+ mContext.getPackageName()
+ "/vFrames");
if (!mediaStorageDir.exists()){
mediaStorageDir.mkdirs();
}
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(mContext, Uri.fromFile(videoCroppedFile));
String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
long videoLength = Long.parseLong(time) / 1000;
double frameSeperationDouble = (double) videoLength / 8;
retriever.release();
final String cmd[] = {
"-i",
videoCroppedFile.getAbsolutePath(),
"-vf",
"fps=1/" + frameSeperationDouble,
"-vframes," + 8,
mediaStorageDir.getAbsolutePath() +
"/%d.jpg"
};I also tried
"-vframes=" + 8at the same point where I put vFrames in cmd. It doesnt seem to work at all now no frames are being extracted from the video -
MediaMetadataRetriever setDataSource failed : status = 0xFFFFFFED
10 octobre 2019, par darjaI need to fetch frames from video located in the web. That’s how I do this :
class PlayerWrapper {
private static final MediaMetadataRetriever mMediaMetadataRetriever = new MediaMetadataRetriever();
…
public void initPlayback(final Context context, final VideoSurfaceView videoSurface, final String url) {
new Thread(new Runnable() {
@Override
public void run() {
…
try {
mMediaMetadataRetriever.setDataSource(url, new HashMap());
} catch (Exception e) {
DPLog(e);
}
}
}).start();
}
public Bitmap getFrameAt(int positionMillis) {
if (mMediaMetadataRetriever != null) {
DPLog.d("Creating frame for position [%s]", positionMillis);
try {
return mMediaMetadataRetriever.getFrameAtTime(positionMillis * 1000);
} catch (Exception e) {
…
return null;
}
} else {
return null;
}
}
}This works fine on several devices with Android 4.4, 5 and 6. But on one device with Android 4.1.2
setDataSourcefunction fails with following stack trace :java.lang.RuntimeException: setDataSource failed: status = 0xFFFFFFED
at android.media.MediaMetadataRetriever._setDataSource(MediaMetadataRetriever.java)
at android.media.MediaMetadataRetriever.setDataSource(MediaMetadataRetriever.java:99)
at co.unreel.videoapp.playback.UnreelPlayer$3.run(UnreelPlayer.java:138)
at java.lang.Thread.run(Thread.java:856)Also tried this code on emulator, got almost the same but with status
0x80000000Url is got from YouTube API, looks like this :
https://r2---sn-n3toxu-axqe.googlevideo.com/videoplayback?gcr=ru&sver=3&mm=31&mn=sn-n3toxu-axqe&key=yt6&signature=D1CE7B8615F3D96A58A9D2679057D676E7777E05.5A318AD8C5F48FCED2D1A9149348CD269F466FA9&mt=1456173450&pl=24&mv=m&ms=au&lmt=1455616987173757&itag=22&requiressl=yes&ip=188.242.217.203&source=youtube&dur=848.248&id=o-ABIn_CbRwqIO6qpvlaWe_ekyTZPLVd0w_eM80awd6uRQ&fexp=9408087%2C9416126%2C9419451%2C9420452%2C9421340%2C9422596%2C9423661%2C9423662%2C9425078%2C9425963%2C9427767%2C9427801%2C9428013%2C9428432%2C9428660%2C9429602&mime=video%2Fmp4&upn=P5qxGGbPoc0&sparams=dur%2Cgcr%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&expire=1456195127&initcwndbps=3140000&ratebypass=yes&ipbits=0Permissions :
Why this can happen and what to do ?
I also tried to use
FFmpegMediaMetadataRetrieverwith the same logic, but it doesn’t work at all,setDataSourcecauses exceptions with status0xFFFFFFFFon all devices. As I found on SO, that means that url is invalid, but it is ok and played byMediaPlayerwithout any issues. Also I found that ffmpeg has issues with urls longer than 1024, but that’s not my case too.May be there are another way to get frames from video ?
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MediaMetadataRetriever setDataSource failed : status = 0xFFFFFFED
22 février 2016, par darjaI need to fetch frames from video located in the web. That’s how I do this :
class PlayerWrapper {
private static final MediaMetadataRetriever mMediaMetadataRetriever = new MediaMetadataRetriever();
…
public void initPlayback(final Context context, final VideoSurfaceView videoSurface, final String url) {
new Thread(new Runnable() {
@Override
public void run() {
…
try {
mMediaMetadataRetriever.setDataSource(url, new HashMap());
} catch (Exception e) {
DPLog(e);
}
}
}).start();
}
public Bitmap getFrameAt(int positionMillis) {
if (mMediaMetadataRetriever != null) {
DPLog.d("Creating frame for position [%s]", positionMillis);
try {
return mMediaMetadataRetriever.getFrameAtTime(positionMillis * 1000);
} catch (Exception e) {
…
return null;
}
} else {
return null;
}
}
}This works fine on several devices with Android 4.4, 5 and 6. But on one device with Android 4.1.2
setDataSourcefunction fails with following stack trace :java.lang.RuntimeException: setDataSource failed: status = 0xFFFFFFED
at android.media.MediaMetadataRetriever._setDataSource(MediaMetadataRetriever.java)
at android.media.MediaMetadataRetriever.setDataSource(MediaMetadataRetriever.java:99)
at co.unreel.videoapp.playback.UnreelPlayer$3.run(UnreelPlayer.java:138)
at java.lang.Thread.run(Thread.java:856)Also tried this code on emulator, got almost the same but with status
0x80000000Url is got from YouTube API, looks like this :
https://r2---sn-n3toxu-axqe.googlevideo.com/videoplayback?gcr=ru&sver=3&mm=31&mn=sn-n3toxu-axqe&key=yt6&signature=D1CE7B8615F3D96A58A9D2679057D676E7777E05.5A318AD8C5F48FCED2D1A9149348CD269F466FA9&mt=1456173450&pl=24&mv=m&ms=au&lmt=1455616987173757&itag=22&requiressl=yes&ip=188.242.217.203&source=youtube&dur=848.248&id=o-ABIn_CbRwqIO6qpvlaWe_ekyTZPLVd0w_eM80awd6uRQ&fexp=9408087%2C9416126%2C9419451%2C9420452%2C9421340%2C9422596%2C9423661%2C9423662%2C9425078%2C9425963%2C9427767%2C9427801%2C9428013%2C9428432%2C9428660%2C9429602&mime=video%2Fmp4&upn=P5qxGGbPoc0&sparams=dur%2Cgcr%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&expire=1456195127&initcwndbps=3140000&ratebypass=yes&ipbits=0Permissions :
Why this can happen and what to do ?
I also tried to use
FFmpegMediaMetadataRetrieverwith the same logic, but it doesn’t work at all,setDataSourcecauses exceptions with status0xFFFFFFFFon all devices. As I found on SO, that means that url is invalid, but it is ok and played byMediaPlayerwithout any issues. Also I found that ffmpeg has issues with urls longer than 1024, but that’s not my case too.May be there are another way to get frames from video ?
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