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The pirate bay depuis la Belgique
1er avril 2013, par
Mis à jour : Avril 2013
Langue : français
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Sur d’autres sites (8899)
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Mixing audio, given timestamps. How to do it efficiently ?
2 août 2021, par EvilI have two stereo sounds, 1.wav and 2.wav, these sounds are less than 1 second long and list of timestamps (miliseconds from start of recording). Recording of pure video (recording.mp4) is several hours long and there are thousands (20 000 - 30 000) of timestamps per sounds.


I want to convert list of timestamps and sounds into one recording, merging it with video. The part of merging audio with video is easy with ffmpeg, so this is not part of the question.


The list of timestamps is tsv, for example :




1201\t1.wav

1501\t2.wav
1603\t1.wav

and so on, up to 50 000



I can convert it to anything, I am generating this file.


I have seen mixing sound with padding and mixing audio to existing video, but I have to batch process a lots of samples, running sox that many times is not feasible. Mere onstructing input for ffmpeg or sox is a cumbersome task.


I do not use any effects on sounds. There is no explicit support in sox to take one input and play it multiple times (echo / echos destroys the material). Also creating padding or delay takes a lot of time. FFMPEG also needs long query to make it happen.


Since muxing two files is easy, I have tried to record two sounds separately, but still it takes a lot of time to process.


Is there simpler / faster way ?


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I am trying to merge audio in video using ffmpeg but it is crashing
28 février 2023, par Sachin SaxenaI am getting this crash message when i click on third button to merge audio with video , first i am selecting the path of video and audio then i am merging the audio with video


private fun mergeAudioAndVideo(videoFile: String, audioFile: String, outputFile: File) {
 val command = arrayOf(
 "ffmpeg",
 "-i", videoFile,
 "-i", audioFile,
 "-c:v", "copy",
 "-c:a", "aac",
 "-strict", "experimental",
 "-map", "0:v:0",
 "-map", "1:a:0",
 "-shortest",outputFile.absolutePath

 )
 val process = Runtime.getRuntime().exec(command)
 process.waitFor()


 }


The crash i am getting on LogCat is here


E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.example.mergev, PID: 10113
 java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:622)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006)
 Caused by: java.lang.reflect.InvocationTargetException
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006) 
 Caused by: java.io.IOException: Cannot run program "ffmpeg": error=2, No such file or directory
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:1050)
 at java.lang.Runtime.exec(Runtime.java:699)
 at java.lang.Runtime.exec(Runtime.java:564)
 at com.example.mergev.MainActivity.mergeAudioAndVideo(MainActivity.kt:65)
 at com.example.mergev.MainActivity.onCreate$lambda$2(MainActivity.kt:45)
 at com.example.mergev.MainActivity.$r8$lambda$9Q0VdcecuU1VoneEsUOL6ljoNPQ(Unknown Source:0)
 at com.example.mergev.MainActivity$$ExternalSyntheticLambda2.onClick(Unknown Source:2)
 at android.view.View.performClick(View.java:7570)
 at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1202)
 at android.view.View.performClickInternal(View.java:7525)
 at android.view.View.access$3900(View.java:836)
 at android.view.View$PerformClick.run(View.java:28680)
 at android.os.Handler.handleCallback(Handler.java:938)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loop(Looper.java:263)
 at android.app.ActivityThread.main(ActivityThread.java:8296)
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006) 
 Caused by: java.io.IOException: error=2, No such file or directory
 at java.lang.UNIXProcess.forkAndExec(Native Method)
 at java.lang.UNIXProcess.<init>(UNIXProcess.java:133)
 at java.lang.ProcessImpl.start(ProcessImpl.java:141)
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
 at java.lang.Runtime.exec(Runtime.java:699) 
 at java.lang.Runtime.exec(Runtime.java:564) 
 at com.example.mergev.MainActivity.mergeAudioAndVideo(MainActivity.kt:65) 
 at com.example.mergev.MainActivity.onCreate$lambda$2(MainActivity.kt:45) 
 at com.example.mergev.MainActivity.$r8$lambda$9Q0VdcecuU1VoneEsUOL6ljoNPQ(Unknown Source:0) 
 at com.example.mergev.MainActivity$$ExternalSyntheticLambda2.onClick(Unknown Source:2) 
 at android.view.View.performClick(View.java:7570) 
 at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1202) 
 at android.view.View.performClickInternal(View.java:7525) 
 at android.view.View.access$3900(View.java:836) 
 at android.view.View$PerformClick.run(View.java:28680) 
 at android.os.Handler.handleCallback(Handler.java:938) 
 at android.os.Handler.dispatchMessage(Handler.java:99) 
 at android.os.Looper.loop(Looper.java:263) 
 at android.app.ActivityThread.main(ActivityThread.java:8296) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006) 
I/Process: Sending signal. PID: 10113 SIG: 9
</init>

I have a video and a audio and i want to merge the audio and video using ffmpeg


I am getting this crash message when i click on third button to merge audio with video , first i am selecting the path of video and audio then i am merging the audio with video


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Compiling FFMPEG on CentOS DigitalOcean
29 juillet 2015, par coder_ukI set up a DigitalOcean instance running CentOS 6.5 and successfully followed the guide to compile FFMPEG (https://trac.ffmpeg.org/wiki/CompilationGuide/Centos). Hurrah !
But of course I realised that by default, DigitalOcean creates a root user and so ffmpeg now lives in /root/bin/ffmpeg. Which isn’t ideal because when I want to exec the ffmpeg bin from nginx, I would have to run nginx as root for it to have permission.
Questions ...
1) Long-shot, but presumably if I change the owner of the ffmpeg binary to nginx, it still won’t work, because nginx won’t be able to access the /root folder it is in. Correct ?
2) I could run nginx as root (’user root’). But this seems like a very bad idea. Correct ?
3) Which leaves me with the option of creating a new user, and then compiling ffmpeg into its home folder. But : which user ? EC2 creates ’ec2-user’, so should I make my own equivalent for DO ? But then won’t I have to run nginx as that user, else I’ll run into the same problem ?
Or should I compile ffmpeg into the ’nginx’ home folder, if indeed it has one ? Is that how it is supposed to be done ?
Since compiling ffmpeg takes ages, I don’t want to keep doing it, and the static files all seem very out of date. Thanks
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