I have a mkv file with an audio track (raw AAC file with ADTS headers) and I would like to merge it with another audio file that has my comments on it (AAC m4a file recorded with my phone.
I know I can merge both audio files in one track with te following command:
ffmpeg -i input.mkv -i audio.m4a -i audio.aac -filter_complex
"[1][2]amix=inputs=2[a]" -map 0:v -map "[a]" -c:a:1 aac copy test.mkv
However I would like my voice (audio.m4a) to be around 40% louder than the original audio (audio.acc). How can i do that?
Related
I have the following problem.
In the folder there is video.mp4 file (contain 1 audio stream). There are also 3 different files audio1.wav, audio2.wav, audio3.wav. These files I need to 'attach' as multi stream to the video file - so the user can choose the audio language in VLC player or similar. Result must be one audio at the time - no mixing it all together.
Now, I've done it via Premiere Pro with multitrack (quicktime export to mov), and then I run a script to change audio stream names to correspond with the audio language (iso 639-2 ) and output the mp4 file. All works well, but I wonder if there is simple way to do everything via ffmpeg ( .bat script ). I have a working script for replacing audio in the video, but I need to add few additional .wav to the video file as separate audio tracks.
Any help will be appreciated!
To add a new audio track into an existing video with audio, use
the -i parameter to specify all the input files (original video and additional audios)
the -map option to manually select the tracks of each input (https://trac.ffmpeg.org/wiki/Map)
in your case,
-map 0 to copy all streams from the input #0 (video)
-map 1:a to include all audio streams from input#1 file (audio1)
-map 2:a to include all audio streams from input#2 file (audio2)
and so on
and
-shortest to crop the output to the shortest input
and additionally you may want to use
-c:v copy to copy the video stream without reencoding.
so, try this (line split for readability)
ffmpeg -i video.mp4 -i input1.mp3 -i input2.mp3
-map 0 -map 1:a -map 2:a
-c:v copy -shortest
output.mp4
and (addording to your comment) adding metadata for the audio tracks
ffmpeg -i video.mp4 -i input1.mp3 -i input2.mp3
map 0 -map 1:a -map 2:a
-metadata:s:a:0 language=eng
-metadata:s:a:1 language=ger
-metadata:s:a:2 language=fra
-disposition:a:0 default
-c:v copy -shortest
output.mp4
everybody here! So basically this is what I want to achieve:
I have a muted video about 3 minutes long.
I have a list of audio tracks in mp3 format (40 songs in a folder with duration 2 to 6 mins each one)
I want this video to play cycled automatically taking songs from playlist and injecting them to the video one by one. Every time a song finishes the next one from the list should start playing at the moment. Video continues playing and doesn't care duration of tracks.
I consider it as the first step on the way to broadcast radio with a video background on youtube in 24/7 mode with ability to put additional tracks to playlist without need to stop translation.
My problem is that I'm new in FFmpeg and I would appreciate any suggestions regarding which FFMpeg topic to start investigate with in order to achieve my goal
Use the concat demuxer
You can do live updates to the playlist for the concat demuxer, but each audio file must have the same attributes, the same number of streams, and all be the same format.
Create input.txt containing:
ffconcat version 1.0
file 'audio1.mp3'
file 'audio2.mp3'
file 'audio3.mp3'
file 'audio40.mp3'
All file names must be "safe" or it will fail with Unsafe file name. Basically no special characters in file names and only use absolute paths. See concat demuxer for more info.
Run ffmpeg to stream to YouTube:
ffmpeg -re -framerate 10 -loop 1 -i image.jpg -re -f concat -i input.txt -map 0:v -map 1:a -c:v libx264 -tune stillimage -vf format=yuv420p -c:a aac -g 20 -b:v 2000k -maxrate 2000k -bufsize 8000k -f flv rtmp://youtube
When you are ready to add new songs make temp.txt containing:
ffconcat version 1.0
file 'audio41.mp3'
file 'audio42.mp3'
file 'audio43.mp3'
Replace input.txt atomically:
mv temp.txt input.txt
See FFmpeg Wiki: Concatenate for lots more info.
If your audio files are not the same
The files listed in input.txt must all have the same:
Format (AAC, MP3, etc, but not mixed)
Sample rate (48000, 44100, etc)
Number of channels (mono, stereo, etc).
If they vary then you will have to pre-process them before adding them to the playlist. Bash example conforming each audio to stereo (-ac 2) with 44100 sample rate (-ar 44100) and save as AAC format in M4A container:
mkdir conformed
for f in *.mp3; do ffmpeg -i "$f" -map 0:a -ac 2 -ar 44100 -c:a aac "conformed/${f%.*}.m4a"; done
Outputting to AAC is recommended for streaming to YouTube.
If you do this then you can avoid re-encoding the audio in the ffmpeg command to YouTube. Just change -c:a aac to -c:a copy in step #2: Run ffmpeg to stream to YouTube.
I need to write ffmpeg profile to merge to merge video and audio files, and swap audio in video file from audio file, add BITC , and implement watermark from network location.
Can do it separately, but as I`m not FFMPEG expert, hard for me to combine all of above together.
Any advise would be appreciate.
Best regards all
Use the overlay filter for the watermark and the drawtext filter for the burnt-in timecode:
ffmpeg -i video.mp4 -i audio.mp3 -i watermark.png -filter_complex "[0:v:0]drawtext=fontfile=/usr/share/fonts/TTF/DejaVuSansMono.ttf:timecode='01\:23\:45\:00':r=25:x=(w-text_w)/2:y=h-text_h-20:fontsize=20:fontcolor=white:box=1:boxborderw=4:boxcolor=black[bg];[1][bg]overlay=W-w-10:H-h-12:format=auto[v]" -map "[v]" -map 1:a -shortest output.mp4
Hi newbie ffmpeg user here with ffmpeg v3.2.4 on a Win7 Ultimate x64 PC.
I have a number of .TS files which I'm trying to remux to .MP4. In addition to the video stream and the usual audio stream, some have two audio streams, where the first is a Narrative (NAR) stream and the second is the actual audio content I want. When remuxing using the command line
ffmpeg -i input.ts -c copy output.mp4
ffmpeg uses the NAR stream instead of the second audio stream. How do I get it to use the second audio stream instead please?
Many thanks
Alan
To copy all streams
ffmpeg -i input.ts -map 0 -c copy output.mp4
To copy all audio streams
ffmpeg -i input.ts -map 0:v -map 0:a -c copy output.mp4
To copy only 2nd audio stream
ffmpeg -i input.ts -map 0:v -map 0:a:1 -c copy output.mp4
I have some video files that I need to re-encode due to compatibility issues. They are currently mkv files with h.264 video and ac3-a52 audio. I want to keep the h.264 video, convert the container to m4v and create two audio tracks, one with the original ac3-a52 and one copied from that but in aac stereo.
I assume there has to be some sort of audio stream mapping command but I don't know how to map and re-encode at the same time. What command should I enter into ffmpeg to achieve this?
Also, what is the difference between ac3 and ac3-a52? Will an apple TV still be able to pass through ac3-a52 or does that have to be converted to ac3?
this works for me:
ffmpeg -y -i Source.mkv -map 0:v -c:v copy -map 0:a -c:a copy -map 0:a -strict -2 -c:a aac out.mkv
-y – A global option to overwrite the output file if it already exists.
-map 0:v – Designate the video stream(s) from the first input as a source for the output file.
-c:v copy – Stream copy the video. This just muxes the input to the output. No re-encoding occurs.
-map 0:a – Designate the audio stream(s) from the first input as a source for the output file.
-c:a copy – Stream copy the audio. This just muxes the input to the output. No re-encoding occurs.
-strict -2 -c:a aac – Use the native FFmpeg AAC audio encoder. -strict -2 is required as a way that you acknowledge that the encoder is designated as experimental. It is not a great encoder, but it is not too bad at higher bitrates.
According to wikipedia, there is no difference between AC3 and ATSC A/52: the 1st one is the name of the codec, the 2nd is the name of the standard specifying the AC3 codec. Maybe someone have more knowledge about it?
I'm doing the same as the OP, but with an m4v container. I'm using the MacPorts "nonfree" variant of ffmpeg so that I can use libfaac, which gives better audio quality than the built-in AAC encoder and also had the same issue as #dkam. The command line I ended using is like this:
ffmpeg -i input.m4v -map 0:v -c:v copy -map 0:a -c:a:0 copy -map 0:a -c:a:1 libfaac output.m4v
(The videos are for playback on an iPad, which doesn't seem to be able to handle ac3.)
This command will take a video with 1 audio stream, and downmix to stereo and convert the audio stream and add it as a 2nd audio stream. It will be in AAC 384k.
ffmpeg -i INPUT.mkv -strict -2 -map 0 -c copy -map 0:a:0 -c:a:1 aac -b:a 384k -ac 2 OUTPUT.mkv
Explanation of the command
ffmpeg -i INPUT.mkv The application and input file
-strict -2 Enable downmixing support
-map 0 Tell ffmpeg read all Video, Audio, and Subtitle streams for the following arguments
-c copy Copy everything
-map 0:a:0 Tell ffmpeg to read the first audio stream for the following arguments
-c:a:1 aac Output the audio to a 2nd audio channel (0 = first channel) in aac format. Important! You must change the output channel to a higher number if there are multiple audio streams to prevent overwriting them.
-b:a 384k 384k bitrate (I don't know what's good for aac stereo but this is really high since it's for 5.1 aac)
-ac 2 Downmix to stereo
OUTPUT.mkv Output file
More examples
A video with two audio streams. Creating a third audio stream by encoding the first.
ffmpeg -i INPUT.mkv -strict -2 -map 0 -c copy -map 0:a:0 -c:a:2 aac -b:a 384k -ac 2 OUTPUT.mkv
Again a video with two audio streams, but you want to encode the second one
ffmpeg -i INPUT.mkv -strict -2 -map 0 -c copy -map 0:a:1 -c:a:2 aac -b:a 384k -ac 2 OUTPUT.mkv