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• Output a video file from ffmpeg directly to google cloud storage

  24 juin 2021, par Anup Sedhain

  Background on the problem

  


  We are trying to compress a video using FFmpeg in our server that is hosted in the Google App Engine (GAE). The input file is in Google Cloud Storage (GCS) which can be easily passed as an input to FFmpeg and the processing is done, however, I wanted to output the file directly to GCS. I have referred to the documentation here https://ffmpeg.org/ffmpeg-protocols.html#http that they provided and used the correct headers and method to upload the file using a signed URL, but it doesn't seem to work. As of now, I am not even sure whether this is possible.

  


  Current Implementation

  


  Currently, we are first saving the output file in the GAE workspace and then uploading the file to the bucket. This flow worked fine until we faced another problem. Whenever the file is too big, the processing takes more than 10 mins which seems to be the threshold for Automatically Scaled Instances in the Flexible environment. To get around this problem we could use basic_scaling in a Standard environment but there we cannot seem to write files in the GAE workspace. I could choose to write in the /tmp directory but that uses RAM and we can have many files being uploaded at a time, so it's not an option.

  


  Possible Future

  


  Right now one solution I have seen is to use a Flexible environment with manual scaling, but this is a bad idea when it comes to scaling and cost-effectiveness. Another, which I am not so sure about would be to use Google Compute Engine but I am yet to try this.

  


  Conclusion

  


  The problem that arose from not being able to make a PUT request to Google Cloud Storage from FFmpeg led me to go through tens of problems surrounding GAE and its weird combination of instances and feature set.

  


  Would really appreciate suggestions or possible solutions if I am missing anything. If only we could make the FFmpeg output the file to GCS.

  


• Join videos command line debian [on hold]

  2 avril 2014, par Roman

  Good evening

  I'm looking for a solution for the following problem :
  I have to join multiple video files (webM-format) with different settings (resolution, fps, ...) into one final file. I should also add an additional audio-track who's exactly as long as all video files together (wav-format).

  I've tried it with ffmpeg and concat like this :
  ffmpeg -i "concat:file1.webm|file2.webm|file3.webm" -vcodec libvpx -s 1280x720 -i track.wav -acodec libfaac -ab 128k -async 10 final.webm

  Result : Worked fine, but just with the first video file. All the others were ignored by ffmpeg.

  Have you any other solution for this problem ?

  Best Regards,
  Roman Ackermann

• Packet Corruption : Why sometimes ffmpeg .bat batch video editing makes my computer unstable unable to restart ?

  13 juin 2022, par principal-ideal-domain

  I'm doing very time consuming ffmpeg video editing. That's why I put my commands into a .bat batch file and run them over night. Usually that works fine, but from time to time when I look the next moring I see an error message of this kind :

  


  

  


  From that state on, I didn't find any good way to close the console. When I press the [x] button in the top right corner, it freezes. When I try to kill the application using the task manager nothing happens. Even explorer.exe cannot be closed using the task manager. A shutdown won't do anything. During the last month I had this problem about three times and the only way I could close it was to long press the power button of the computer until it was turned off "the bad way".

  


  Any ideas what to in such situations ?
  
Or even better : How to prevent those situations ?
What can the reason(s) be for the error ?
Do you understand the message ?

  


  When the computer is started again the next morining and I run the same .bat file again everything works fine. So the same error does not repeat and the video is edited nicely !

  


  Edit : Now, about one week after posting this question the problem occurred many more times ! It is very annoying. I guess it has to do with the external hard drive connected by USB. Sometimes it randomly interrupts the connection ! That might be the reason for the behavior. Whatever its causing the error, I want to learn a solution how to deal with this in future. I don't want to always push the reset button of my computer. I want a proper way to be able to shut it down.