I have two videos of different lengths Video one: 12 minutes Video two: 6 minutes I want to take audio of video one I want to take image of video two And put them together Output video length = 6 minutes. Use ffmpeg one command please help me - thanks ( watch image )____
Use
ffmpeg -i 12m.mp4 -i 6m.mp4 -vf setpts=(PTS-STARTPTS)/1.1 -af atempo=1.1 -map 1:v -map 0:a -shortest new.mp4
The setpts filter alters the video frame timestamps to 1/1.1 of their present value. FFmpeg will drop frames in the cadence needed to preserve source framerate.
The atempo filter speeds up the audio to 1.1 times the original speed.
-map 1:v -map 0:a tells ffmpeg to include the video stream from the 2nd input (6m.mp4) and the audio from the first input.
-shortest tells ffmpeg to conclude conversion when the shorter (of the audio and video) stream ends.
Related
I am processing my video(640 X 1280 dimensions). I want to divide my video horizontally into 2 separate videos(each video will now be 640 X 640 in dimensions),then combine them horizontally (video dimension will be now 1280 X 640)in a single video. I did the research on the internet and my issue was solved and not solved at the same time
I made a batch file and add these commands in it:-
ffmpeg -i input.mp4 -filter_complex "[0]crop=iw:ih/2:0:0[top];[0]crop=iw:ih/2:0:oh[bottom]" -map "[top]" top.mp4 -map "[bottom]" bottom.mp4
ffmpeg -i top.mp4 -i bottom.mp4 -filter_complex hstack output.mp4
Yes,my task got solved but many other issues also came out of it:-
1.) My output video has NO audio in it. No idea why there is no audio in the end results
2.) My main video file (on which I am doing all this) is 258 MB in size. But the result was only 38 MB in size. No idea what is happening? And even worse,I closely looked at the video,results were pretty same (only animation were not as smooth in output file as compared to input file)
3.) It is taking too much time(I know that computing takes some time but maybe there may be some way/sacrifice to make the process much quicker)
Thanks in advance for helping me
Combine your two commands
ffmpeg -i input.mp4 -filter_complex "[0]crop=iw:ih/2:0:0[top];[0]crop=iw:ih/2:0:oh[bottom];[top][bottom]hstack" -preset fast -c:a copy output.mp4
If you need it to encode faster then use a faster -preset as shown in FFmpeg Wiki: H.264.
x264 is a better encoder than your phone so it is not surprising that the file size is smaller.
Or use your player to do it
No need to wait for encoding. Just have your player do everything upon playback. This does not output a file, but only plays the re-arranged video. Example using mpv:
mpv --lavfi-complex="[vid1]split[v0][v1];[v0]crop=iw:ih/2:0:0[c0];[v1]crop=iw:ih/2:0:oh[c1];[c0][c1]hstack[vo]" input.mp4
I was playing with this for several hours, I couldn't make so thought of reaching for help, Can you please help me in framing the ffmpeg command to display the watermark Image on the video, For the Initial half video the watermark should be on the bottom left and for the rest half video the watermark shop be on the right top.
Bottom left: ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" -codec:a copy output.mp4
Top right:
ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=main_w-overlay_w-5:5" -codec:a copy output.mp4
Also, I had a look on this for Timeoverlay ffmpeg watermark first 30 second.
How to merge all these and satisfy my requirements as mentioned above?
In this example the duration of input.mp4 is 30 seconds. The overlay filter supports the enable option.
ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='lte(t,15)'[bg];[bg][1]overlay=main_w-overlay_w-5:5:enable='gte(t,15)'" -codec:a copy output.mp4
To get duration see How to get video duration in seconds?. On Linux one method to calculate 50% duration is with bc. See example at Use ffmpeg to get middle frame of a video?
Alternative method is to use the sendcmd filter, but it is more complicated. See example at Sendcmd in ffmpeg.
See available functions at FFmpeg Expression Evaluation.
A bit of history. I am using Plex as my media server, but for reasons unknown, it has issues transcoding the DTS-HD MA 7.1 audio to EAC3 stereo and keeps buffering (the server has plenty of horsepower on all fronts, CPU/RAM/drive space & speed, gigabit networks connections for all devices. The playback device (TCL Roku TV, with a 3rd party soundbar connected via HDMI ARC) doesn't support the built-in 7.1 audio, so I get silence if I play it back directly by putting the file on a USB stick.
Also, I am by no means a ffmpeg guru, I figured out what I do know by Google University and asking questions, so please be kind and forgive me if I ask follow-up questions that may seem n00b-ish, and please provide example commands (preferably in the context of my command below so that I can have a known point of reference to start with).
I have a movie with 4K (HEVC Main 10 HDR) video and DTS-HD MA 7.1 audio that I am looking to leave the video and audio untouched, but to add a 2nd audio track in either EAC3 or if necessary, just AC3 in stereo
So what I am looking for is as follows:
video.mkv
Existing->4k video file (no change)
Existing->7.1 audio (no change)
Convert and add->stereo audio as a 2nd audio track to the output.mkv file
Below is the command I've historically used with ffmpeg to convert and replace the audio file with the stereo audio, but since I'd prefer to leave the 7.1 audio in place, this doesn't work:
ffmpeg -i "D:\video.mkv" -c:v copy -c:a aac -b:a 128k "D:\output.mkv"
And if this cannot be done as a single command, please also let me know what steps I do need to take to be able to do it.
Thanks in advace,
Mike
ffmpeg -i input.mkv -map 0 -map 0:a -c copy -c:a:1 eac3 output.mkv
-map 0 select all streams.
-map 0:a select all audio streams. This combines with -map 0 so now you have 1 video and 2 audio streams selected.
-c copy stream copy all streams.
-c:a:1 eac3 encode output audio stream #1 with eac3 encoder. This overrides -c copy for this particular stream.
I have a single video with no audio tracks and want to add several audio tracks sequentially (each track starts immediately after the other).
The basic case might look something like this:
|-----------VIDEO-----------VIDEO-------------VIDEO-----------VIDEO-----------|
|---FULL AUDIO TRACK 1---|---FULL AUDIO TRACK 2---|---PARTIAL AUDIO TRACK 3---|
Here is my attempt to achieve this:
ffmpeg -i video.mov -i audio1.mp3 -i audio2.mp3 -i audio3.mp3 -map 0:0 -map 1:0 -map 2:0 -map 3:0 out.mp4
Of course it doesn't produced the desired result. It only uses the first music clip in out.mp4, and no other audio tracks are started when it ends.
Question 1
What am I missing in order to add multiple audio tracks sequentially? I assume it's specifying starting and end points of audio clips but I'm coming up short on locating the syntax.
...
In addition, I'm looking for a way to ensure that the video ends with the full duration of AUDIO TRACK 3, as seen below:
|-----------VIDEO-----------VIDEO-------------VIDEO-----------VIDEO-----------|
|---FULL AUDIO TRACK 1---|---PARTIAL AUDIO TRACK 2---|---FULL AUDIO TRACK 3---|
In this case, AUDIO TRACK 2 gets trimmed so that the full AUDIO TRACK 3 is pinned to the end.
Question 2
Can this type of audio pinning be done in FFmpeg, or would I have to trim AUDIO TRACK 2 with another program first?
Use the atrim, asetpts, and concat filters:
ffmpeg -i video.mov -i audio1.mp3 -i audio2.mp3 -i audio3.mp3
-filter_complex "[2:a]atrim=duration=5,asetpts=PTS-STARTPTS[a2];[1:a][a2][3:a]concat=n=3:a=1:v=0[a]"
-map 0:v -map "[a]" -c copy -c:a aac -shortest output.mp4
atrim trims the audio. You can also use the start and/or end options if you prefer them over duration.
asetpts resets the timestamps (required by concat).
concat concatenates each audio segment.
If you want to automate this you'll have to script it. You can get the duration of each input with ffprobe:
ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 input.mp4
Then use that to determine the duration of whatever audio stream you want to trim.
I'm using ffmpeg to build a short hunk of video from a machine-generated png. This is working, but the video now needs to have a soundtrack (an [audio] field) for some of the other things I'm doing with it. I don't actually want any sound in the video, so: is there a way to get ffmpeg to simply set up an empty soundtrack property in the video, perhaps as part of the call that creates the video? I guess I could make an n-second long silent mp3 and bash it in, but is there a simpler / more direct way? Thanks!
Thanks to #Alvaro for the links; one of these worked after a bit of massaging. It does seem to be a two-step process: First make the soundtrack-less video and then do:
ffmpeg -ar 44100 -acodec pcm_s16le -f s16le -ac 2 -channel_layout 2.1
-i /dev/zero -i in.mp4 -vcodec copy -acodec libfaac -shortest out.mp4
The silence comes from /dev/zero and -shortest makes the process stop at the end of the video. Argument order is significant here; -shortest needs to be down near the output file spec.
This assumes that your ffmpeg installation has libfaac installed, which it might not. But, otherwise, this seems to be working.
I guess you need to create a media file properly with audio and video stream. As far as i know, there is not a direct way.
If you know your video duration, first create the dummy audio and after when you create the video try to join the audio part.
In superuser, you can find more info link1 link2