On 2021-06-27 11:43, Eduard B wrote:
Hi list, I am using ffmpeg to convert a large set of timelapse still frames (JPGs) captured by my surveillance camera to a video. Using x265 library to make the file smaller. The particular batch I have tested has 14401 JPG files in a folder (one image captured every 6 seconds). Command is: ffmpeg -i /mnt/user/cctv/mjwVb9pFuK/8sHGyfFGu6_timelapse/$(date -d "-1 days" '+%Y-%m-%d')/%06d.jpg -c:v libx265 -preset medium -crf 20 -r 30 -c:a aac -b:a 128k /mnt/user/cctv/mjwVb9pFuK/8sHGyfFGu6_timelapse/$(date -d "-1 days" '+%Y-%m-%d')_x265_correct.mp4 I wanted to convert to a 30 FPS video, the command I have been using, which works, converts the files to a video, however it complains about duplicate frames. While investigating, I have realized the final duplicate frames count has 2880 frames, which is 1/5 of the total amount of still images. Seems to me that the encoder assumes the input is recorded at 25 FPS and tries to convert it to a video which has the same length, but with 30 FPS. However, the input is a series of still images with no frame rate. I have changed the command to a similar one, using 25 FPS frame rate parameter value instead, and the complaint about duplicate frames is gone. This means I would need to explicitly tell the encoder the input is using 30 FPS, rather than the default assumption of 25. I have been looking at the "--fps" option, however documentation says "YUV only", I'm not sure it's applicable.
For image sequence inputs, use the framerate option. ffmpeg -framerate 30 -i ... Regards, Gyan _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
