I would like to script this command
ffmpeg -i concat:file1.mp3\|file2.mp3 -acodec copy output.mp3
which merges file1.mp3 and file2.mp3 to become output.mp3.
The problem is that I have a lot more than 2 files that I would like to merge.
Example
ffmpeg -i concat:file1.mp3\|file2.mp3 -acodec copy output1.mp3
ffmpeg -i concat:output1.mp3\|file3.mp3 -acodec copy output2.mp3
ffmpeg -i concat:output2.mp3\|file4.mp3 -acodec copy output3.mp3
ffmpeg -i concat:output3.mp3\|file5.mp3 -acodec copy output4.mp3
output4.mp3 is the result I am looking for.
The files are not actually nicely called "file" adn then a number, but ls lists them in the order they should be merged in.
Question
How can this be scripted, so I can execute it in a directory with either an even or odd number of files?
if ffmpeg supports more then two files and no file contains |, and there are not too many, you can do:
ffmpeg -i concat:"$(ls|tr '\n' '|')" -acodec copy out.mp3
if not:
for cfile in *.mp3; do
ffmpeg -i concat:myout.mp3tmp1\|$cfile -acodec copy myout.mp3tmp2
mv myout.mp3tmp2 myout.mp3tmp1
done
mv myout.mp3tmp1 <your final file name>
If you can just concatenate all files in one wash, that'd be best. But a generic answer for your Bash question:
ffmpeg -i concat:file1.mp3\|file2.mp3 -acodec copy output1.mp3
for i in $(seq 1 10); do
ffmpeg -i concat:output${i}.mp3\|file$((i + 2)).mp3 -acodec copy output$((i + 1)).mp3
done
Here 10 is two less than your total number of input files.
Related
there are what i done:
download a full mp4 file.
due to it's watermark(0s-10s), i split the full video into 2 parts from 10second. the first part with watermark.
use ffmpeg delogo the first part.
merge the two video into a full again.
wget -O download.mp4
ffmpeg -i download.mp4 -vcodec copy -acodec copy -t 00:00:10 tmp1.mp4
ffmpeg -i download.mp4 -vcodec copy -acodec copy -ss 00:00:10 tmp2.mp4
ffmpeg -i tmp1.mp4 -vf "delogo=x=432:y=44:w=1060:h=108" -c:a copy tmp3.mp4
echo file tmp3.mp4 > mergelist.txt && echo file tmp2.mp4 >> mergelist.txt
ffmpeg -f concat -i mergelist.txt -c copy output.mp4
problem i faced:
in the last merged video, only one tmp part is fine, the other's video and voice not sync and play time more faster than before.
why i divide it, delogo(although only the first 10 seconds shows) full video more than 1h, re-encode takes much time, 10s part fine to me.
Have you tried this?
ffmpeg -i download.mp4 -vf "delogo=enable='lte(t,10)':x=432:y=44:w=1060:h=108" -c:a copy output.mp4
I'm assuming delogo filter is timeline editing enabled.
I try to generate a shorter version of a 10min original videofile.mp4 that includes only four 10s subclips of the original file (i.e. from seconds 10 to 20;197 to 207;393 to 403;570 to 580). So far I could only generate 4 new files copying both video and audio:
ffmpeg -i videofile.mp4 -vcodec copy -acodec copy -ss 10 -to 20 videofile1.mp4 -vcodec copy -acodec copy -ss 197 -to 207 videofile2.mp4 -vcodec copy -acodec copy -ss 393 -to 403 videofile3.mp4 -vcodec copy -acodec copy -ss 570 -to 580 videofile4.mp4
However, I am having deep trouble in concatenating those 4 subclips to generate the desired 40seconds out_videofile.mp4. I found this alternative approach using the "select" command in ffmpeg which saves me of my "failed" concatenation process. So far I have:
ffmpeg -i videofile.mp4 -vf "select='between(t,10,20)+between(t,197,207)+between(t,393,403)+between(t,570,580)',setpts=N/FRAME_RATE/TB" -af "aselect='between(t,10,20)+between(t,197,207)+between(t,393,403)+between(t,570,580)" out_videofile.mp4
I guess this last code should give me the 40s out_videofile.mp4 I want. However, it gives me a "SyntaxError: invalid syntax". Any idea where I go wrong?
Thanks for your time anyways.
You're missing a closing quote, but also a filter for smoothing the audio timestamps.
Use
ffmpeg -i videofile.mp4 -vf "select='between(t,10,20)+between(t,197,207)+between(t,393,403)+between(t,570,580)',setpts=N/FRAME_RATE/TB" -af "aselect='between(t,10,20)+between(t,197,207)+between(t,393,403)+between(t,570,580)',asetpts=N/SR/TB" out_videofile.mp4
I use such small script to convert videos from my SAT receiver to h264/mp3 format.
[maciek#piotr Pobrane]$ cat ./conv_sat_to_clean_ts
#!/bin/bash
ffmpeg -i $1.ts -movflags +faststart -vcodec h264 -acodec mp3 -f mpegts $1-new.ts
The problem is that when I call that script in such way:
./conv_sat_to_clean_ts ./Operacja\ Dunaj.ts
it shows me an error:
./Operacja: No such file or directory
So that means that spaces included in call parameters are ignored and filename is not interpreted correctly.
Is any way to resolve that problem?
Give $1 in double quotes since filename has space.
ffmpeg -i "$1".ts -movflags +faststart -vcodec h264 -acodec mp3 -f mpegts "$1"-new.ts
and run the script without .ts
./conv_sat_to_clean_ts ./Operacja\ Dunaj
or
./conv_sat_to_clean_ts "Operacja Dunaj"
Yes. RBH was right. Now my script looks like this and work properly.
#!/bin/bash
ffmpeg -i "$1" -movflags +faststart -vcodec h264 -acodec mp3 -f mpegts NEW-"$1"
And spaces in filenames (as script call parameter) are interpreted correctly
ffmpeg has concat option for this but all streams start working really bad and breaking sound after a day of streaming.
I tried looking at loops but i couldnt figure out how to execute a loop with ffmpeg command so it transcodes all files in 1 directory
/lely/ffmpeg -y -re -i /home/ftp/kid1.mp4 -vcodec copy -acodec copy -dts_delta_threshold 1000 -ar 44100 -ab 32k -f flv rtmp://10.0.0.17:1935/live/kid
In folder /home/ftp/ there are files kid1, kid2, kid3 - all *.mp4 files
So basically i would like a loop to change the input to next file every time previous ends.
Maybe you could use find and xargs to help you feed the files for ffmpeg:
find /home/ftp -name "*.mp4" | xargs -I $ /lely/ffmpeg -y -re -i $ -vcodec copy -acodec copy -dts_delta_threshold 1000 -ar 44100 -ab 32k -f flv rtmp://10.0.0.17:1935/live/kid
Here you first ask find to look for all mp3 files in /home/ftp.
Then you feed the results to xargs. For xargs you tell it to replace input it receives with token $ in your ffmpeg string.
You can concatenate the video files to a "named pipe" and use the pipe as a source for ffmpeg.
For example:
mkfifo pipeFile # create a FIFO file (named pipe)
cat $(find /home/ftp -name "*.mp4") > pipeFile & # concatenate video files do the pipe (do not forget the "&" for running in background)
/lely/ffmpeg -y -re -i pipeFile -vcodec copy -acodec copy -dts_delta_threshold 1000 -ar 44100 -ab 32k -f flv rtmp://10.0.0.17:1935/live/kid # run ffmpeg with the pipe as the input
Notes:
The order of files in the input will be that the find generates. You can add a "sort" command after the find to produce files in a sorted manner.
I have not tested this, since a I do not have ffmpeg installed. However, it should work :-)
I am appending 2 mp4 files together using the following routine:
ffmpeg -y -i one.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy one.ts
ffmpeg -y -i two.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy two.ts
cat one.ts two.ts >> joined.ts
ffmpeg -y -i joined.ts -vcodec copy -acodec copy -absf aac_adtstoasc joined.mp4
This works fine, however when one.mp4 has no audio stream (the file is created using ffmpeg from a single jpeg, so no sound), the routine appends the files but the audio of two.mp4 starts at the beginning of the video. how should I solve this problem? Should I add switches to my append routine so that the audio in two.mp4 starts playing where it should, or should I add something to the ffmpeg command which creates the video from jpg?
here is the command I use to create one.mp4 which contains no sound:
ffmpeg -y -loop 1 -i blah.jpg -t 3 -vcodec libx264 one.mp4