All Questions
Tagged with ffmpeg ffmpeg-filters
51
questions
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answers
53
views
FFmpeg scale filter unexpectedly adds padding
I'm using FFmpeg to transcode and shrink some videos to AV1 using the scale filter and AMD's hardware encoder, available in FFmpeg as av1_amf. Usually it works fine, but now I've run into a video ...
0
votes
0
answers
75
views
FFMPeg: Avoiding clipping of image when rotating overlay
Im trying to add an image overlay on top of a video and have to rotated the image arbitrarily.
Below is the command I'm using to rotate by -30 deg.
ffmpeg -i input_video.mp4 -i crown.png -...
0
votes
0
answers
65
views
Bug in FFmpeg signature?
I tried using the signature filter on two completely different videos.
For below command where video1 and video2 are completely different videos, the signature filter code still passes the coarse ...
1
vote
1
answer
703
views
Error submitting a packet to the muxer: Cannot allocate memory
I'm attempting to trim and concatenate several video files using ffmpeg. These videos have already been transcoded with H.264 at a resolution of 720p. However, when executing the command, I encounter ...
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0
answers
81
views
Pausing the video for 15 seconds
I have a video which is 40 seconds long, I want to make it 55 seconds long, I wanted that the video's first frame along with it's audio freezes (frame freezes) for the first 15 seconds and after the ...
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0
answers
23
views
Use font attachment from an mkv container when burning hard subtitles
I want to use the font that is in an mkv as an attachment when I burn in subtitles.
I found a way to do this using -dump_attachment first.
ffmpeg -dump_attachment:t "" -i video.mkv
ffmpeg -i ...
1
vote
0
answers
225
views
concatenating multiple files is giving Non-monotonic DTS in output stream error
I am trying to concatenate multiple video files with ffmpeg and python with the following code :-
def story(path):
videos = [f for f in os.listdir(path) if f.endswith(".mp4")]
print(videos)
...
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votes
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answers
463
views
How to extract keyframe timestamps from video using ffmpeg
I want to extract the timestamps of keyframes from a video using ffmpeg. I found this thread that explains pretty much how to do it.
However, it appears that my video does not have the pkt_pts_time ...
1
vote
1
answer
94
views
Splitting, trimming, converting to image and concatenating issues with FFmpeg
I am new to FFmpeg. I read some essential basics but cannot figure out why the following command does not work. The script is written in Windows in PowerShell.
ffmpeg -hide_banner `
-loop 1 -t 3 -i ...
1
vote
1
answer
509
views
Adding timer to video using FFmpeg
I'm trying to find a way to add a countdown text to videos using FFmpeg.
I want the text to be "Time left: mm:ss" but to avoid leading zeros for minutes.
So, for example:
Time left: 10:01
...
1
vote
1
answer
354
views
FFmpeg add text in a box with rounded corners
Is there a way to add a text with countdown timer to a video using FFmpeg where the text is contained in a semi-transparent box with rounded corners with one of the side borders in a different color?
...
0
votes
1
answer
67
views
Side-by-side Comparison with scale2ref & hstack: Wrong Content Received as Output
I have two videos (no other streams there) with a format of 1440x1080. The first video should be positioned left to the second (at the right), whilst the second must be rotated by 90° clockwise (...
1
vote
1
answer
365
views
Flip video with hardware acceleration ffmpeg on Windows 11
I am trying to use hardware acceleration to horizontally flip videos but I can't seem to get it right. I don't want to change the codec but just keep the same (just hflipped).
I am using Intel Arc Pro ...
2
votes
1
answer
144
views
Overlay a different png for each single frame of a video
I have a video and a set of images (each image for one video frame) I want to overlay the images over the video, each image over one single frame. The images and the video have the same size. I know ...
0
votes
1
answer
189
views
FFmpeg frame counter + resolution/bitrate/FPS box
I was trying to use drawtext FFmpeg filter to insert a frame counter at the bottom of my video by using this command:
ffmpeg -i input.mp4 -vf "drawtext=fontfile=C\\:/Windows/fonts/consola.ttf: ...