Body: <p>I have been extracting frames from videos, editing these frames using ffmpeg, then converting the edited image sequence back into videos.</p>
  
  <pre><code># Get the video's framerate
  ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate video_in.webm
  # e.g. cmd returns 5675/189
  
  ffmpeg -i video_in.webm ./frames/image%05d.png
  cd ./frames
  # Image editing by various means, usually ending with
  ffmpeg -i input1.png -i image%05d.png -filter_complex hstack ./output/image%05d.png
  cd ./output
  ffmpeg -framerate 5675/189 -i image%05d.png -c:v libvpx-vp9 -pix_fmt yuva420p -lossless 1 video_out.webm
  </code></pre>
  
  <p>For most videos, things work perfectly. For some, though, the output video seems to be missing the last few frames (e.g. maybe 0.5-1 seconds worth). In the latest video where it happened (though not the only one), I had deleted some of the ending frames of the original image sequence i.e. I extracted 220+ frames, manually deleted the last 20+, so I'm only left with ~200, performed additional editing as in the above code, then combined together back into a video. Yet when I view the video, it seems to stop at around frame 170-80+ and the rest is seemingly dropped.</p>
  
  <p>I had seen it happen before, but those videos are maybe 1-2s long so I thought maybe it's too short, and settled for converting to gifs instead. But for this particular occurrence the output video is ~6s long. That's near the lower bound of the usual output video durations I work with.</p>
  
  <p>Why is that happening? I'm not an expert in video-editing technicalities, so I don't know if I didn't configure something or is doing something wrong. What's going wrong here and how do I fix it? Thanks!</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-16T13:28:13.310Z
Comments.Text: Check that there are no gaps in the numbering. The sequence filenames have to be a smooth unbroken series.
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-16T13:39:52.553Z
Comments.Text: Yes, there're no gaps. The extracted images run from image00001 to image00227. After manual deletion I'm left with image00001 to image00206. When I convert to gif, all the frames are in the gif. But when I convert to video, the last ~0.5 seconds got cut off.
Comments.UserDisplayName: thegreatjedi
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-16T14:02:47.787Z
Comments.Text: How re you checking the video file?
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-16T14:03:31.343Z
Comments.Text: I play the video in vlc player and the images from the last few frames (not the deleted ones) aren't inside
Comments.UserDisplayName: thegreatjedi
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-16T14:10:01.617Z
Comments.Text: Which frame of the input sequence does `ffmpeg -sseof -1 -i video_out.webm -update 1 lastfr.png` show?
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-16T14:23:56.653Z
Comments.Text: hmm strange, it seems the last frame IS added in after all. It shows when I upload to gfycat, but not when I preview it via VLC player. Strange...well I guess it's not an issue anymore. Thanks for the help anyway!
Comments.UserDisplayName: thegreatjedi
Tags: <ffmpeg>
Title: FFMPEG dropping last few frames when converting image sequence to video
UserDisplayName: thegreatjedi
ThreadText: # FFMPEG dropping last few frames when converting image sequence to video
  
  (Asked by: username_0 on 2019-11-16)
  
  I have been extracting frames from videos, editing these frames using ffmpeg, then converting the edited image sequence back into videos.
  
  ```
  # Get the video's framerate
  ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate video_in.webm
  # e.g. cmd returns 5675/189
  
  ffmpeg -i video_in.webm ./frames/image%05d.png
  cd ./frames
  # Image editing by various means, usually ending with
  ffmpeg -i input1.png -i image%05d.png -filter_complex hstack ./output/image%05d.png
  cd ./output
  ffmpeg -framerate 5675/189 -i image%05d.png -c:v libvpx-vp9 -pix_fmt yuva420p -lossless 1 video_out.webm
  
  ```
  
  For most videos, things work perfectly. For some, though, the output video seems to be missing the last few frames (e.g. maybe 0.5-1 seconds worth). In the latest video where it happened (though not the only one), I had deleted some of the ending frames of the original image sequence i.e. I extracted 220+ frames, manually deleted the last 20+, so I'm only left with ~200, performed additional editing as in the above code, then combined together back into a video. Yet when I view the video, it seems to stop at around frame 170-80+ and the rest is seemingly dropped.
  
  I had seen it happen before, but those videos are maybe 1-2s long so I thought maybe it's too short, and settled for converting to gifs instead. But for this particular occurrence the output video is ~6s long. That's near the lower bound of the usual output video durations I work with.
  
  Why is that happening? I'm not an expert in video-editing technicalities, so I don't know if I didn't configure something or is doing something wrong. What's going wrong here and how do I fix it? Thanks!
  
  **Tags:** ffmpeg
  
  > **Comments:**
  > **username_1**: Check that there are no gaps in the numbering. The sequence filenames have to be a smooth unbroken series.  
  > **username_0**: Yes, there're no gaps. The extracted images run from image00001 to image00227. After manual deletion I'm left with image00001 to image00206. When I convert to gif, all the frames are in the gif. But when I convert to video, the last ~0.5 seconds got cut off.  
  > **username_1**: How re you checking the video file?  
  > **username_0**: I play the video in vlc player and the images from the last few frames (not the deleted ones) aren't inside  
  > **username_1**: Which frame of the input sequence does `ffmpeg -sseof -1 -i video_out.webm -update 1 lastfr.png` show?  
  > **username_0**: hmm strange, it seems the last frame IS added in after all. It shows when I upload to gfycat, but not when I preview it via VLC player. Strange...well I guess it's not an issue anymore. Thanks for the help anyway!  
  
  ---
  
  ## 0 answers
  
  