I am trying to use FFMPEG to splice few videos and output one combined video.
I managed to get all video stream with this command :
ffmpeg.exe -i 1.mov -i 2.mov -filter_complex "[0:v]scale=1920:1080[v0];[1:v]scale=1920:1080[v1];[v0][v1] concat=n=2:v=1[v]" -map "[v]" out.mp4
Also, to add a dummy audio to a video with this command:
ffmpeg.exe -i 1.mov -f lavfi -i aevalsrc=0 -shortest -i out.mov
Above commands work perfectly, however 2.mov has an audio stream while 1.mov does not.
Is there any method that can set a dummy audio for 1.mov and then combine both video and audio streams from 1.mov and 2.mov at one go, so that output a combined video that can play sound when it is at clip 2.mov.
Use
ffmpeg.exe -i 1.mov -i 2.mov -f lavfi -t 1 -i anullsrc -filter_complex "[0:v]scale=1920:1080[v0];[1:v]scale=1920:1080[v1];[v0][2:a][v1][1:a] concat=n=2:v=1:a=1[v][a]" -map "[v]" -map "[a]" out.mp4
-f lavfi -t 1 -i anullsrc adds a silent 1 second audio input, which is used as a counterpart to the video input from 1.mov. The concat filter will pad the audio to match the video duration of 1.mov.
Related
I want to attach/append an image (something like youtube) to first frame of the video, i tried this command :
ffmpeg -i video.mp4 -i image.png -map 1 -map 0 -c copy -disposition:0 attached_pic out.mp4
But it doesnt working, the first frame is not my custom image
my ffmpeg version:
ffmpeg version n4.4-80-gbf87bdd3f6-20210830 Copyright (c) 2000-2021 the FFmpeg developers
You will have to concatenate a frame to the beginning.
Re-encode audio in video.mp4. The audio is HE-AACv2, but you don't have a HE-AACv2 encoder. So it has to be changed to the more common AAC-LC to allow concatenation with the video generated from the image.
ffmpeg -i video.mp4 -c:v copy -c:a aac main.mp4
Make a video from image.png with silent filler audio. It has to have the same attributes as main.mp4.
ffmpeg -loop 1 -framerate 30 -i image.png -f lavfi -i anullsrc=r=48000 -frames:v 2 -c:v libx264 -vf format=yuv420p -video_track_timescale 30k -c:a aac image.mp4
-frames:v 2 is used instead of -frames:v 1 as required for the audio.
Make input.txt containing:
file 'image.mp4'
file 'main.mp4'
Concatenate:
ffmpeg -f concat -i input.txt -c copy output.mp4
I try concat two videos (1.mkv has 640:360 image size, 2.mkv has 1280:720 image size), both videos have 2 video tracks and 0 audio tracks. I tried this code:
ffmpeg -i 1.mkv -i 2.mkv -filter_complex "[0:v:0]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[v0];[0:v:1]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[v0];[v0][1:v:0][1:v:1]concat=n=2:v=2:a=0[v]" -map "[v]" -c:v "libvpx" 1+2.mkv
But I have wrong:
Filter pad has an unconnected output
Your filter labels need to be adjusted, and you need to change v=2 to v=1 in concat filter:
ffmpeg -i 1.mkv -i 2.mkv -filter_complex "[0:v:0]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[v0];[1:v:0]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[v1];[v0][v1]concat=n=2:v=1:a=0[v]" -map "[v]" -c:v libvpx 1+2.mkv
Since 2.mkv is already 1280x720 you can avoid processing that input:
ffmpeg -i 1.mkv -i 2.mkv -filter_complex "[0:v:0]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[v0];[v0][1:v]concat=n=2:v=1:a=0[v]" -map "[v]" -c:v libvpx 1+2.mkv
I need to overlay audio files at specific times, on an existing silence.mp3. Something like that:
[----[...audio1...]----------[...audio2...]---------------]
I've tried the following but it doesn't work:
ffmpeg -y -i silence.mp3 -itsoffset 4 -i audio1.mp3 -itsoffset 30 -i audio2.mp3 -c:a copy final.mp3
Any help would be appriciated. Thank you.
There are several methods.
adelay, amix
Use the adelay and amix filters:
ffmpeg -i audio1.mp3 -i audio2.mp3 -filter_complex "[0]adelay=4s:all=1[0a];[1]adelay=30s:all=1[1a];[0a][1a]amix=inputs=2[a]" -map "[a]" output.mp3
Note that the amix filter will reduce volume of the output to prevent clipping. Followup with dynaudnorm or volume filters if desired.
adelay, concat filter
Or adelay and concat filters. This assumes audio1.mp4 is 10 seconds long, and both inputs have the same sample rate and channel layout:
ffmpeg -i audio1.mp3 -i audio2.mp3 -filter_complex "[0]adelay=4s:all=1[0a];[1]adelay=16s:all=1[1a];[0a][1a]concat=n=2:v=0:a=1[a]" -map "[a]" output.mp3
anullsrc, concat demuxer
Or generate silent files as spacers with the anullsrc filter:
ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -t 4 4.mp3
ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -t 16 16.mp3
Create input.txt:
file '4.mp3'
file 'audio1.mp3'
file '16.mp3'
file 'audio2.mp3'
Then use the concat demuxer:
ffmpeg -f concat -i input.txt -c copy output.mp3
I have a short and a long mp4 video. In the long video, I would like to replace the visual with a part of the visual of the short video. Additionally, I would like to keep the audio of the long video throughout.
The following set of commands work. However the concat and audio replacing seems to add a slight delay to the video, which makes the audio slightly out of sync from the video.
ffmpeg -ss 0 -i short.mp4 -t 2.0 -vcodec copy -an v1_short.mp4
ffmpeg -ss 0 -i long.mp4 -t 6.0 -vcodec copy -an v1_before.mp4
ffmpeg -ss 8.0 -i v_before.mp4 -vcodec copy -an v1_after.mp4.mp4
ffmpeg -i v1_before.mp4 -i v1_short.mp4 -i v1_after.mp4 -filter_complex "[0:v] [1:v] [2:v] concat=n=3:v=1 [v]" -map "[v]" out_temp.mp4
ffmpeg -i long.mp4 -i out_temp.mp4 -c copy -map 0:v -map 1:a out_final.mp4
How can I do this without the audio getting out of sync?
I am using ffmpeg version 4.0.2.
I am using ffmpeg on Ubuntu 14.04 (Jon Severinsson's PPA) and am playing video files out of a folder - one by one.
First question I wasn't able to figure out yet - how can I add a simple overlay - 720p footage with 720p overlay (with partial transparency)? So there is no resize or alignment needed - just the 1:1 overlay. I tried a lot already with -vf and -filter_complex but didn't show up.
Second question - with concatenate, is it possible to have the switches between the files seamless? Best without creating a new file - so, on the fly? I need to reduce the gaps between the file switches or eliminate them completely.
This is my bash right now:
#!/usr/bin/env bash
while :; do
files=(*)
ffmpeg -re -i "${files[$RANDOM % ${#files[#]}]}" -acodec copy -vcodec copy -f flv ServerAddress
done
So I have everything in /vod - the videofiles, as well as the overlay.png
Thanks a bunch in advance,
Tim
For the overlay you need to scale the image to the original source dimensions.
To concat multiple source files that have the same codec use the concat demuxer.
Eg:
Make a playlist.txt with the following format:
file '/path/to/file_1'
file '/path/to/file_2'
file '/path/to/file_3'
[..]
And then:
ffmpeg -f concat -i playlist.txt -i overlay.png -filter_complex "[1:v] scale=1280:720 [ovr];[0:v][ovr] overlay=0:0" ...
If the video and the image are the same size you can just use:
ffmpeg -f concat -i playlist.txt -i overlay.png -filter_complex "[0:v] overlay"
Update:
Full example:
You cannot filter and copy the video stream at the same time!
ffmpeg -re -f concat -i playlist.txt -i overlay.png -filter_complex "[0:v] overlay" -c:v h264 -c:a libfdk_aac -ar 44100 -f flv rtmp://...
If your audio stream is valid and has one of the supported audio rates (44100, 22050, 11025) you can do:
ffmpeg -re -f concat -i playlist.txt -i overlay.png -filter_complex "[0:v] overlay" -c:v h264 -c:a copy -f flv rtmp://...