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• Divide videos to sub videos by FFMPEG

  1er mars 2013, par seereen

  I have DVDs each one has 5 avi video ,,,, I am trying to divid these 5 avi to sub videos (at least 12 small avi videos) depending on the marker on some frames ...

  the problem is ... some time the new video contain frames from 2 original avi (for example : the sub video number 7 will have the last frames from original video 2 and the first frames from video 3)
  In this case my code crashed ! and Program received signal : EXC_BAD_ACCESS. error !!
  the problem happen in this function

  void write_video_frame(AVFormatContext *oc, AVStream *st, AVFrame *frame)
  
  in if (oc->oformat->flags & AVFMT_RAWPICTURE)  

  any idea why I got this problem ....
  I am using FFMPEG 0.11 and openCV 2.4.3 in OSx 10.6.8

• IOS development uses ffmpeg to slice videos into ts files, but the playback direction is incorrect

  12 septembre 2023, par 扬巴卡

  In iOS development, I used FFmpeg to slice the recorded video into ts and m3u8, and then uploaded it to the server. However, when pulling the playback link of m3u8, the displayed video did not have the same direction as the original video. Did the rotation information of the original video be deleted during the FFmpeg slicing process ? The FFmpeg command I used was

  


  ffmpeg - y - i inputPath - c copy - bsf: v h264_ MP4Toannexb - hls_ Time 6- hls_ List_ Size 0 outPath`your text`


  


  I do not know why，anyone can help me？

  


• FFMPEG and AWS : What's the most efficient way to handle this ?

  28 mai 2022, par Red Vic

  I'm new to AWS and I originally built the FFmpeg functions on my Node.JS API. But I realized this is the wrong way to do it in a real-world app, and that you need to use separate Lambda functions in AWS that handle the video editing separately from the main server.

  


  I'm mainly a front-end developer but I'm open to learning new things.

  


  I basically have the following process in my app :

  


  

  • User uploads video.

  


  • I need to take that video and add a watermark to it.

  


  • I then need a copy of the watermarked video in a smaller resolution.

  


  • I then need a 6 seconds GIF of the smaller resolution video.

  


  • Finally, I need to upload the 3 edited files (2 .mp4's and 1 .gif) to S3, and remove the original, non-watermarked video.

  


  


  Here are my questions to be clear :

  


  

  • Should I upload the original file to S3 or to the server ? And why ?

  


  • Is the process above doable in a single Lambda function ? Or do I need more Lambda functions ?

  


  • How would you handle this problem, personally ?

  


  


  I originally built it by chaining one function to the next with promises, but AWS seems like a different world of doing things and the way I originally built it would not work.

  


  Thanks a lot.

  


  Update
Here are some tests I did with a couple videos :

  


  





  


  


  


  


  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  	Test 1	Test 2	Test 3	Test 4	Test 5
  Original video resolution	1080p	1080p	1080p	1080p	480p
  Original video duration	23 minutes	15 minutes	11 minutes	3.5 minutes	5 minutes
  Step 1 duration (Watermarking original video)	30 minutes	18 minutes	14 minutes	4 minutes	2 minutes
  Step 2 duration (Watermarking lower resolution)	5 minutes	3 minutes	3 minutes	1 minute	skip (already low res)
  Step 3 duration (6 seconds GIF creation)	negligible (15 seconds)	negligible (10 seconds)	negligible (7 seconds)	negligible	negligible
  Total	35 minutes	21 minutes	17 minutes	5 minutes	2 minutes