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• Getting garbled frames when exporting video to image sequence in FFMPEG

  28 janvier 2018, par film_guy01

  I’m very new to FFMPEG to go easy on me.

  So I’ve just started playing around with ffmpeg but I’m getting some promising results. But I keep getting images like this : https://i.imgur.com/wIMkVoV.jpg which is not what that image it supposed to look like (in case you were uncertain).

  here’s been my command line code :

  ffmpeg -i inputfile.mkv -q:v 1 -r 0.20 outputfile_%04d.jpg

  My input file is a .h264 compressed ultra high definition video saved as .mkv format.

  I’ll get error messages like this :

  [h264 @ 0x7fbccd84ce00] co located POCs unavailable
  
  [h264 @ 0x7fbccd81e200] error while decoding MB 45 61, bytestream -17 drop=406 speed=1.71x    
  
  [h264 @ 0x7fbccd81e200] concealing 17764 DC, 17764 AC, 17764 MV errors in P frame
  
  [h264 @ 0x7fbccd84ce00] co located POCs unavailable
  
  [h264 @ 0x7fbccd814400] reference picture missing during reorder
  
  [h264 @ 0x7fbccd814400] Missing reference picture, default is 65986
  
  [h264 @ 0x7fbccd814400] error while decoding MB 71 100, bytestream -26drop=598 speed=1.79x    
  
  [h264 @ 0x7fbccd814400] concealing 8378 DC, 8378 AC, 8378 MV errors in B frame
  
  [h264 @ 0x7fbccd81dc00] co located POCs unavailable
  
  [h264 @ 0x7fbccd81e200] co located POCs unavailable
  
  [h264 @ 0x7fbccd863200] co located POCs unavailable
  
  [h264 @ 0x7fbccd814400] error while decoding MB 43 116, bytestream -5 drop=710 speed=1.81x   

  Sometimes I get these errors as well, but I’m not sure they’re related.

  [h264 @ 0x7fbcce004c00] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  [swscaler @ 0x7fbccf0c8000] deprecated pixel format used, make sure you did set range correctly

  Any idea how to fix this problem and get ffmpeg to export the images cleanly ? This would be HUGE if I could figure out how to get this working.

  Thanks !

• Use FFMPEG to Save Live CCTV Video Streams that Has Wrong FPS Encoded, Published by Video Clips instead of Frames, and With Nonnegligible Frame Loss

  6 mars 2023, par Crear

  I want to use FFMPEG command line to archive live CCTV video stream (no audio) from Newark Citizen Virtual Patrol (https://cvp.newarkpublicsafety.org) for traffic analysis, previously I was using (I'm just a noob in these commands)
os.system('ffmpeg -t 24:00:00 -i '+address+' -hide_banner -c:v copy -s 640x360 -segment_time 00:15:00 -f segment -strftime 1 -reset_timestamps 1 "'+OutPath+camera_location+'_%Y-%m-%d-%H-%M-%S.mp4"') to archive the videos everyday and segment them into 15-min-long videos.

  


  However, there are several issues.

  


  

  1. The FPS read from the video stream is actually slower than it really is. For example, it's actually 12, but the decoded result says 8, so every time it generates a 15-min-long video, it only pasts 10 11 mins in the real world.

  


  2. Due to unstable frame loss, the FPS is not a stable value either. Therefore, when I manually set the FPS, it usually make the video has wrong length, and sometimes when the stream froze, it keeps waiting because it hasn't finished 15-min-long video. Something I noticed is that it may generate a 15-min-long video, which contains both night and day, started from perhaps 2AM but ended at 8AM.

  


  3. The live CCTV video stream is not frame by frame, but video clip by video clip. Therefore, when I set the -use_wallclock_as_timestamps to 1, the video will be ultra-fast playing the short video clip, then frozen for the rest of time until receiving next video clip.

  


  


  The only thing I can think of is to re-distribute the frames evenly between the timestamp of receiving the current video clip and the timestamp of receiving the prior video clip. What parameters can help FFMPEG to fix the FPS and archive correctly ? I am using FFMPEG to save the video instead of using OpenCV to decode the frame and then encode a video because we have huge amounts of cameras and our legacy Xeon processor had trouble encoding so many frames simultaneously.

  


  Any suggestion is appreciated !

  


• using ffmpeg from macOS terminal for uploading youtube short from android just do nothing

  25 juin 2023, par Yogi Arif Widodo

  my component / recording is using blachole plugin on macOS.

  


  engine : 13" Macbook Pro M1 ( macOS 13.2 / Ventura )

  


  step to reproduce

  


  

  1. my output is screenRecordingAudio ( this name is custom name ).

  


  


  // screenRecordingAudio in audioMidi : 
BlackHole 16ch [mark as checked on use]
External Headphones [mark as checked on use]


  


  


  screenRecordingAudio is using on by click on right top of bar UI, click sound, click screenRecordingAudio.

  


  


  OR

  


  


  screenRecordingAudio is using on Settings ➡️ Sounds ➡️ Output ➡️ then choose screenRecordingAudio

  


  


  

  2. my input is quickTimeInput ( this name is custom name ).

  


  


  // quickTimeInput in audioMidi : 
BlackHole 16ch [mark as checked on use]


  


  

  3. then using ⌘ + shift + 5 , on option i use quickTimeInput

  


  4. i use these command to convert into mp4 and also purpose to get more small size video

  


  


  #!/bin/bash

# greet the user
function yoVideo() {
  ffmpeg -i $1.mov -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k -movflags +faststart $1.mp4
}


  


  OR

  


  ffmpeg -i yogiarifwidodo.mov -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k -movflags +faststart yogiarifwidodo.mp4


  


  

  5. then i move the video into my phone android.

  


  6. then when i tried to upload on youtube as short, its cannot be process to upload ( its just do nothing ) but when i upload on facebook reels its work also on instagram story its still working also for whatsapp story.

  


  


  when i didnt convert into mp4 its also happend and in any other case for example whatsapp story , its lagging to review video before upload . its happend to on instagram .
but when i force upload , the result video is good and smooth . then i re download my video its still best video and when try to upload my download video , there is no lagging in any condition.

  


  how to get ffmpeg perform into mp4 and also no lagging on editing while uploading at whatsapp story or instagram story or facebook , etc ?
by the way i dont know command ffmpeg , the code is copied from stackoverflow and i forgot where is it.