I'm using a script to convert all video files in a folder. These files have multiple audio tracks and I want the converted files to have each audio track as well. I've tried both -c copy and -c:a mp3 and neither worked for me. Any ideas how I can modify this to copy all audio tracks?
#!/bin/sh
for i in *.mkv; do ffmpeg -i "$i" -c:a mp3 -vcodec libx264 -crf 18 -r 60 "${i%.mkv}.mp4"; done
You can do this by setting -c:a copy. In your example you're attempting to set the audio codec to mp3, which is actually just the container. Hope that helps!
I should amend this... My first thought will simply copy the single, highest-quality audio stream from the input file. To copy all streams we'll want to use the map option1. Your example, copying all audio streams could look like this:
#!/bin/sh
for i in *.mkv; do
ffmpeg -i "$i" -map 0 -c copy -c:v libx264 -crf 18 -r 60 "${i%.mkv}.mp4";
done
Related
I'm creating MP4 files from MP3 files + an image. Searching here at StackOverflow I found a Terminal command that gets me really close:
ffmpeg -loop 1 -r 1 -i pic.jpg -i input.mp3 -c:a copy -shortest -c:v libx264 output.mp4
Works almost perfectly so long as input.mp3 and pic.jpg are in the same folder. The problem is:
It frequently ends up with about 20-40seconds of blank space at the end of the resulting MP4. I can manually chop it off, but I'd love to find out if there's a way to alter this command so that the resulting MP4 file is exactly the length of the input MP3 file.
I don't know the ffmpeg commands well and know just enough Terminal to be dangerous. So I'm hoping it's something obvious haha.
This command should work for you:
ffmpeg -i input.mp3 -loop 1 -i pic.jpg -shortest -c:a copy -c:v mjpeg output.mp4
You do not need to set -r 1 with just one image and -loop 1.
I think -c:v mjpeg is more suitable to encode jpg than -c:v libx264.
For cropping mp3 to 30 seconds i use this and it worked well until somebody uploaded mp3 file with album cover
ffmpeg -t 30 -i in.mp3 -acodec copy out.mp3
And now i've got this:
Any suggestions?
Looks like your ffmpeg build does not have the PNG encoder.
Use
ffmpeg -t 30 -i in.mp3 -c:v copy -c:a copy out.mp3
i try to write an .sh that read a folder create a playlist of mp4 files and then generate an only big video with a sequence of all videos find in the folder, and encode it for dash:
printf "file '%s'\n" ./*.mp4 > playlist.sh
ffmpeg -f concat -safe 0 -i playlist.sh -c copy concat.mp4
Till now i follow the demux concat official guido to ffmpeg website.
Without result, also the following give me "more than 1000 frames duplicated between videos of the sequence"
ffmpeg -f concat -i playlist.sh -c:a aac -b:a 384k -ar 48000 -ac 2 -c:v libx264 -x264opts 'keyint=50:min-keyint=50:no-scenecut' -r 25 -b:v 2400k -maxrate 2400k -bufsize 1200k -vf "scale=-1:432 " out.mp4
Thanks a lot
Sry, cannot comment (yet)...
Your commands are correct, I could just concat some sample videos.
Do you always get the mentioned error, or also something else? And is the video working, or no video is created?
In most cases, the input video is incorrect. Wrong input format (not fitting to file extension) or worse like ending at wrong frame.
Perhaps you can make the video available?
PS: Needed to add -safe 0 to the second command to avoid error [concat # 0x7fbfd1000000] Unsafe file name './small.mp4'
Hint: Do not use file extension .sh for your list of video files. This extension is used for shell scripts, so it can be confusing. Just use .txt.
UPDATE #Massimo Vantaggio
We should not create new answers, but I cannot comment yours and I also don't know how to continue our discussion, so I edit my answer.
Your videos don't look very different. Can't see, what's wrong with the first one.
Perhaps you could use ffprobe -report input.mp4 to get more informations. Look for errors or warnings.
My assumption is still that the video was cut in a hard way (by conversion software), so keyframes are messed up or something else.
You can also try to first reencode your video with ffmpeg. After that, it should be complete compatible with ffmpeg ;)
Something like this:
ffmpeg -i small.mp4 -acodec aac -ab 192k -vcodec libx264 -vb 1024k -f mp4 output.mp4
Use -ab and -vb from your input video, or at least the bitrate from input. Quality will decrease a little bit and file size increase, but it should be okay.
How do I encode multiple video files in one batch with ffmpeg, using the same settings?
I found this one-line solution that converts .avi files in the current folder to .mov. Note that I want to encode .mov -> .mov :
for i in *.mov; do ffmpeg -i "$i" "${i%.mov}.mov" ; done
I wish to use the following settings for encoding:
ffmpeg -i "$i" -c:v libx265 -preset ultrafast -crf 20 -af "volume=25dB, highpass=f=200, equalizer=f=50:width_type=h:width=100:g=-15" -c:a aac -strict experimental -b:a 192k OUTPUT-ENCODED.MOV
Possible ways to prevent overwriting:
Add -ENCODED to the end of the filename before the file extension
Rename the files to something sequential, like OUTPUT01.MOV, OUTPUT02.MOV, etc
Put the encoded files in a directory subfolder but with the same file names
You can freely manipulate the output file ${i%.mov}.mov - here, the "key ingredient" is that the statement ${i%.mov} yields content of variable i with the shortest match of .mov deleted from the back. For details see this tutorial on manipulating strings in bash.
Here's what I have to do,
I want to convert two different images in different video file (ex: convert a.jpg into a.avi and b.jpg into b.avi).
I am trying to generate video (.avi) from image file. Video file is generated successfully but I can't see the audio properties when I right click on video and see details tab in property.
Then I have one video file (.avi), using ffmpeg concat function, I am concating these three video files (a.avi, middle.avi which I already have, b.avi).
After this, I am getting file output.avi but audio is not there in outout.avi file. I have middle.avi which already contains audio.
Here's my concat command,
ffmpeg -i "concat:a.avi|middle.avi|b.avi" -vcodec copy 103_n4_2.avi
I am trying to generate video (.avi) from only one image file. Video file is generated successfully but I can't see the audio properties when I right click on video and see details tab in property.
Here's my command to convert image to video:
ffmpeg -loop 1 -i bCopy.jpg -t 30 -q:v 0 -r 24 output_a.avi
PS: a.avi and b.avi (which I have generated from images does not contain audio) but only middle.avi contains the audio.
I think the audio track is completly ommitted. I was not able to test it but it seams you need to map the audio stream manually to the output and delay it by the the length of your first image.
ffmpeg -i middle.avi -itsoffset 1 -map 1:1 -i "concat:a.avi|middle.avi|b.avi" -map 0:0 -vcodec copy -acodec copy 103_n4_2.avi
Thanks for the help but I have found the solution of this perticular issue,
Here are the steps:
1. Generate blank mp3 of the first slide duration.
- ffmpeg -f lavfi -i aevalsrc=0 -t 31 -q:a 9 -acodec libmp3lame out.mp3
2. Trim audio from middle slide
- ffmpeg -i middle.avi -acodec copy middle.mp3
3. Concat this two audio
- ffmpeg -i "concat:out.mp3|middle.mp3" -acodec copy 103_n4_2.mp3
4. Now concat audio and video(that we've cgenerated by concatenation)
- ffmpeg -i 103_n4_3.avi -i 103_n4_2.mp3 -c:v copy -c:a aac -strict experimental 103_n4_5.avi