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• How to compres a image size to a desired file size in KBs using ffmpeg or python or Ubuntu Command line ?

  16 octobre 2017, par yash17

  I’m using ffmpeg to take a screenshot from a udp stream.
  Due to varying bit rates while transmission, the captured screenshot has different file size everytime.400KB,500KB..Eventhough it is screenshot of a same static page.

  Is there a way to get a specific file size everytime,in ffmpeg ?

  Or is there a command to convert a captured file to the desired KB using Python or through Ubuntu terminal ?

  Here is the command I’m using.

  ffmpeg -i udp://@XXX.XX.XX.XX:XXXX -vframes 1 -q:v 1 test.png

  I also tried the following commands in terminal,but it did nothing.

  convert -define jpeg:extent=100kb test.png output.png

• Unable to scrub video after remuxing multiple mpeg-ts to mp4

  21 juillet 2022, par Jona

  I have written custom code to concat multiple mpeg-ts files into an mp4 video file. I've used as reference the remuxing code sample.

  


  I'm having issues with the final output. I'm unable to scrub the video on QuickTime. The final output seems to be missing something.

  


  I compared using ffprobe my custom code remuxer results to that of using the following terminal command :

  


  ffmpeg -i "concat:input1.ts|input2.ts|input3.ts" -c copy output.mp4


  


  To my surprise, the videos look almost identical but I'm noticing some differences in the reported distance and keyframe values. I also did a hex comparison and see minor differences at the end of the file which tells me I've muxed the frames correctly. What could I be missing ? Any tips or ideas would be really helpful !

  


  FFmpeg terminal remuxed video [WORKING VIDEO]


  


  Custom remuxer code video [SCRUBBING BROKEN]


  


  App.mp4 vs ffmpeg.mp4 remuxed video


  


• Unable to FW/RW video after remuxing multiple mpeg-ts to mp4

  21 juillet 2022, par Jona

  I have written custom code to concat multiple mpeg-ts files into an mp4 video file. I've used as reference the remuxing code sample.

  


  I'm having issues with the final output. I'm unable to fast-forward or rewind as the video looses it's information and plays the same frame till the end. But if i play from the beginning it plays fine.

  


  I compared using ffprobe my custom code remuxer results to that of using the following terminal command :

  


  ffmpeg -i "concat:input1.ts|input2.ts|input3.ts" -c copy output.mp4


  


  To my surprise, the videos look almost identical but I'm noticing some differences in the reported distance and keyframe values. I also did a hex comparison and see minor differences at the end of the file which tells me I've muxed the frames correctly. What could I be missing ? Any tips or ideas would be really helpful !

  


  FFmpeg terminal remuxed video [WORKING VIDEO]


  


  Custom remuxer code video [SCRUBBING BROKEN]


  


  App.mp4 vs ffmpeg.mp4 remuxed video