I need to make an effect of playing mp4 slower and slower each frame - both audio and video - after conversion.
My code is:
ffmpeg -y -i c:\Users\cp\Downloads\CONVERTED\tiktok0045-2.mp4 -filter_complex "[0:v]setpts=(0.005*N+0.5)*PTS;[0:a]atempo=1/(0.005*N+0.5)[a]" -map "[v]" -map "[a]" e:/znet.mp4
But the first line of error is:
[atempo # 00000000021ed240] [Eval # 00000000003ae960] Undefined constant or missing '(' in 'N+0.5)'
How to use this function here?
Related
When using python moviepy library, you can speedup a video to a specific time using the below command:
video.fx(vfx.speedx, final_duration=audio_duration)
Is there a way we can achieve the same using ffmpeg?
I tried the below commands; but this will not accurately speed up the video to a specific time.
ffmpeg =i input.mp4 -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]asettps=0.5*PTS[a]" -map "[v]" -map "[a]" output.mp4
I am trying to concatenate multiple audio files and a single image into one video file using one command.
I have list of mp3 files and a playlist file (.m3u) in a direcotry.
I managed to do this but my solution is bad:
reading the playlist file and creating a new .txt in the ffmpeg required format
concatenating the audio files using the .txt into an .mp3
concatenating the large audio file and the static image into a video
This creates 2 unnecessary files that I have to delete.
I tried a different command
ffmpeg -loop 1 -framerate 1 -i myImage.jpg -i file1.mp3 -i file2.mp3 -i file3.mp3 -filter_complex '[0:0][1:0][2:0]concat=n=3:v=0:a=1' -tune stillimage -shortest output.mp4
however im getting a Error initializing complex filters.
Invalid argument error
Another kick in the nuts is that the system im working on has spaces in the folder names.
i tried using -i "concat:file1.mp3|file2.mp3|..." however i cannot use double quote marks to quote out the path so I get an invalid argument error.
Thank you very much for your help.
Method 1: concat demuxer
Make input.txt containing the following:
file 'file1.mp3'
file 'file2.mp3'
file 'file3.mp3'
Run ffmpeg:
ffmpeg -loop 1 -framerate 1 -i myImage.jpg -f concat -i input.txt -filter_complex "[0]scale='iw-mod(iw,2)':'ih-mod(ih,2)',format=yuv420p[v]" -map "[v]" -r 15 -tune stillimage -map 1:a -shortest -movflags +faststart output.mp4
All MP3 files being input to the concat demuxer must have the same channel layout and sample rate. If they do not then convert them using the -ac and -ar options so they are all the same.
Method 2: concat filter
Update: There seems to be a bug with -shortest not working with the concat filter (I keep forgetting about that). See the method above using the concat demuxer, or replace -shortest with -t. The value for -t should equal the total duration of all three MP3 files.
ffmpeg -loop 1 -framerate 1 -i myImage.jpg -i file1.mp3 -i file2.mp3 -i file3.mp3 -filter_complex "[0]scale='iw-mod(iw,2)':'ih-mod(ih,2)',format=yuv420p[v];[1:a][2:a][3:a]concat=n=3:v=0:a=1[a]" -map "[v]" -r 15 -map "[a]" -tune stillimage -shortest -movflags +faststart output.mp4
Option descriptions
scale filter makes image have even width and height which is required when outputting YUV 4:2:0 with libx264.
format filter sets chroma subsampling to 4:2:0, otherwise libx264 will try to limit subsampling, but most players can only handle 4:2:0.
concat filter is accepting file1.mp3, file2.mp3, and file3.mp3 as inputs. Your original command was trying to concat the video to the audio resulting in Invalid argument.
-map "[v]" chooses the video output from -filter_complex.
-r 15 sets output frame rate to 15 because most players can't handle 1 fps. This is faster than setting -framerate 15.
-map "[a]" chooses the audio output from -filter_complex.
-map 1:a chooses the audio from input #1 (the second input as counting starts from 0).
-movflags +faststart after encoding finishes this option moves some data from the end of the MP4 output file to the beginning. This allows playback to begin faster otherwise the complete file will have to be downloaded first.
I'm trying to concat 3 video files and add text to output using ffmpeg.
Each part is 10 sec long.
I've end up with this code:
ffmpeg -i output3.mp4 -i output2.mp4 -i output1.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0]concat=n=3:v=1:a=1[v][a]; [0:v:0]drawtext=fontfile=tahoma.ttf:text=Sample text:fontcolor=white:fontsize=40:box=1:boxcolor=black#0.7:boxborderw=5:x=100:y=100" -map "[v]" -map "[a]" output.mp4
The result video has 30 seconds but it hangs after 1st part (10s). When I remove drawtext filter part (just concat), then video is fine, but without text...
Anyone can help ?
Use
ffmpeg -i output3.mp4 -i output2.mp4 -i output1.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0]concat=n=3:v=1:a=1[v][a]; [v]drawtext=fontfile=tahoma.ttf:text=Sample text:fontcolor=white:fontsize=40:box=1:boxcolor=black#0.7:boxborderw=5:x=100:y=100[v]" -map "[v]" -map "[a]" output.mp4
Your existing syntax applied the text on top of the video stream of the first input file, instead of the resultant video from the concat filter.
I just started learning FFmpeg. I have code (like below), but it's doing nothing.
fmpeg -i videoplayback.mp4 -filter_complex "[1:v]trim=start=0:end=1,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[intro1];
[1:v]trim=start=1:end=123.39,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[main1];
[1:v]trim=start=123.39:end=124.39,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[end1];
[intro1]format=pix_fmts=yuva420p, fade=t=in:st=0:d=1:alpha=1[intro1];
[end1]format=pix_fmts=yuva420p, fade=t=in:st=0:d=1:alpha=1[end1];
[intro1][main1][end1][output];
[a:1][audio]; -vcodec libx264 -map "[output]" -map"[audio]" "output.mp4"
fmpeg should be ffmpeg.
You only have one input so [1:v] should be [0:v] (it starts counting from 0).
No need for alpha for fading because you are not overlapping or blending frames.
Ending fade needs to be a fade out (not fade in).
You can't re-use filter output labels within the filtergraph.
Some of your filterchains can be combined.
Some of your labels are not associated with a filter (it appears you forgot to use the concat filter).
You can add scale and setsar at the end instead of using them for each segment.
Replace the last ; with ".
You didn't map the audio properly.
Stream copy (re-mux) the audio.
Example:
ffmpeg -i videoplayback.mp4 -filter_complex "[0:v]trim=end=1,setpts=PTS-STARTPTS,fade=t=in:d=1[intro];[0:v]trim=start=1:end=123.39,setpts=PTS-STARTPTS[main];[0:v]trim=start=123.39,setpts=PTS-STARTPTS,fade=t=out:d=1[end];[intro][main][end]concat=n=3:v=1:a=0,scale=480x360,setsar=16/9[v]" -map "[v]" -map 0:a -c:a copy output.mp4
I have the following FFMPEG command:
ffmpeg -i ./master_video.mp4 -i ./temp/temp1.mp4 -i ./temp/temp2.mp4 -y -filter_complex [0:v]setpts=PTS-STARTPTS[v0];[1:a]asetpts=PTS-STARTPTS,volume=0.1[aud1];[1:v]setpts=PTS-STARTPTS+5/TB,fade=t=in:st=5:d=1:alpha=1,fade=t=out:st=14:d=1:alpha=1[v1];[2:a]asetpts=PTS-STARTPTS,volume=0.1[aud2];[2:v]setpts=PTS-STARTPTS+10/TB,fade=t=in:st=10:d=1:alpha=1,fade=t=out:st=19:d=1:alpha=1[v2];[v0][v1]overlay=eof_action=pass[out1];[out1][v2]overlay=eof_action=pass[out2] -map [out2] -map [aud1][aud2] temp.mp4
But when I run it, I received the following error:
error: ffmpeg exited with code 1: Filter volume has an unconnected output
Any ideas why that error is occurring?
If you wish to mix the audio outputs, it needs to be done within the filtergraph.
Use
ffmpeg -y -i ./master_video.mp4 -i ./temp/temp1.mp4 -i ./temp/temp2.mp4 -filter_complex
"[0:v]setpts=PTS-STARTPTS[v0];
[1:a]asetpts=PTS-STARTPTS,volume=0.1[aud1];
[1:v]setpts=PTS-STARTPTS+5/TB,fade=t=in:st=5:d=1:alpha=1,fade=t=out:st=14:d=1:alpha=1[v1];
[2:a]asetpts=PTS-STARTPTS,volume=0.1[aud2];
[2:v]setpts=PTS-STARTPTS+10/TB,fade=t=in:st=10:d=1:alpha=1,fade=t=out:st=19:d=1:alpha=1[v2];
[v0][v1]overlay=eof_action=pass[out1];
[out1][v2]overlay=eof_action=pass[vout];
[aud1][aud2]amix[aout]"
-map [vout] -map [aout] temp.mp4
Note that any audio from the master video is ignored, as it would have been if your original command had worked. Also, the audio and video from the temp videos are no longer synchronized since the setpts expressions are different.