FFmpegCommand | FFmpeg command library , which realizes audio | Messaging library

I am trying to execute commands with the Runtime exec() method I have created one common utility method

I am concatenating thousands of .ts files into an mp4 which works great but is there a way to know which files have already been concatenated with FFmpeg?

The issue I have is I am concatenating multiple videos back to back and if the app is closed off during the concatenation process. The concatenating of the videos may not be complete. I can check if the files exist but the size of the files could be wrong if not all the clips have been concatenated. Is there a way to know if all the files have been concatenated properly?

My current idea is if the app is closed before it has completed concatenating, I would delete the mp4 file and restart concatenating the video again but this time consuming especially if the files concatenated properly the first time.

Any ideas would be great thanks

ffmpegCommand

I'm about to play an fmp4 in HTML5 video element.

I was successfully created a websocket to pass ffmpeg's output into MSE.

However when I try to open the page in Firefox (72.0.1, 64bit, under Ubuntu 18.04LTS), it always results an error:

I'm building a nodejs app that streams a video from the disk to the user. Thanks to this question, i have a working video feed for a "static" video file that is stored on disk, so far so good.

My problem is that i need to transcode the video on the fly, to do this i used fluent-ffmpeg and i was successful at implementing the transcoding, but the HTML5 player only shows the first 3-4s of the video, and then stops. I'm guessing the problem is the filesize, but even when i harcode it nothing changes.

Any idea ? Thanks a lot :)

The command does not save or even create a file:

ffmpeg -i "video.mp4" -f mp3 "audio.mp3" -vstats_file "log_file.log"

And if you convert to a video file, everything normally creates and writes:

ffmpeg -i "video.mp4" -f mp3 "video.avi" -vstats_file "log_file.log"

Goal: to pull out the time from the log file and bind it to the process bar.

There are no problems with video, everything works. But with the sound does not work.

I tried the command:

ffmpeg -i "video.mp4" -f mp3 "video.avi" >2 "log_file.txt" But there are other problems popping out. Since I run it all from the python using the subprocess

ffmpegProc = subprocess.Popen(ffmpegCommand, startupinfo=startupinfo, shell=True) , I can not kill the running process, because it is started with the attribute shell=True, and only the shell is killed.and only the shell is killed.