Questions tagged [concatenation]

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78 votes
7 answers
104k views

Concatenate multiple WAV files using single command, without extra file

I want to concatenate multiple WAV files into a single WAV file using FFMPEG. I have used the following command and it generates the required file. Command: ffmpeg -f concat -i mylist.txt -c copy ...
Manu's user avatar
  • 1,003
46 votes
7 answers
76k views

Join mp4 files in linux

I want to join two mp4 files to create a single one. The video streams are encoded in h264 and the audio in aac. I can not re-encode the videos to another format due to computational reasons. Also, I ...
Jose Armando's user avatar
42 votes
5 answers
28k views

Linux command to concatenate a file to itself n times

I've taken a plain text file book from Project Gutenberg (around 0.5MB) which I want to concatenate to itself n times in order to generate a large text file that I can benchmark some algorithms on. ...
Bryce Thomas's user avatar
  • 1,201
18 votes
7 answers
52k views

Cat command and echo

I'd like to concatenate the output from echo with content of a file. I've tried the following comand: echo "abc" | cat 1.txt > 2.txt but the 2.txt file only contains the content from 1.txt. Why ...
Ringger81's user avatar
  • 1,157
18 votes
1 answer
22k views

FFMpeg concat demuxer unsafe file name

I'm using ffmpeg inside my .net application to merge(concatenate) some short videos with the same encoding and width and height dimensions. I've created a txt file as the documentation says and this ...
Eftekhari's user avatar
  • 401
17 votes
1 answer
250k views

How to concatenate a date in MS-excel and receive a date (not a number)

When I try to concatenate two cells in MS-excel in the formula I have the date as a integer number (eg: 04 april 2012 become 41006). How can I display the date also in the formula cells?
Ale's user avatar
  • 746
16 votes
7 answers
48k views

How can I join multiple .mpg movie files?

I create a lot of these small clips on my digital camera. These are in .mpg format and before I share them with others, I would love to just join, clip a few seconds here and there. I use Google ...
Kapsh's user avatar
  • 417
9 votes
5 answers
18k views

Join Audio and Image -> Output as Video using FFmpeg

I have 1 image (jpg) and 1 audio file (MP3) and I would like to output this as a video file (say AVI for example). Does anyone know how to use FFMPEG to join the two? I'd like to show the image for ...
user41559's user avatar
9 votes
2 answers
798 views

Cannot concatenate videos ffmpeg

I have a bitmap that I would like to concatenate to the front of many videos as a sort of title screen or disclaimer screen. I try to turn it into a video with the same attributes as the rest of the ...
Paul's user avatar
  • 91
7 votes
5 answers
127k views

How to merge/combine files with extensions .001, .002, .003.. etc? [duplicate]

Possible Duplicate: Good free software that will join .001 files? There are files on sites like rapidshare which have extensions like .001, .002, .003? They seem to be split by some tool. How to ...
Tony_Henrich's user avatar
  • 11.7k
7 votes
1 answer
4k views

FFmpeg concatenate audio and offset parts between each other

I figured out how I can concatenate multiple audio files with complex filter, but struggling with offsetting audio in result file. Say, I want to add a gap of 1 seconds silence between each ...
layabout's user avatar
6 votes
1 answer
5k views

Crossfade many audio files into one with FFmpeg?

Using FFmpeg, I am trying to combine many audio files into one long one, with a crossfade between each of them. To keep the numbers simple, let's say I have 10 input files, each 5 minutes, and I want ...
setouk's user avatar
  • 63
6 votes
2 answers
3k views

Concatenate files over FTP

I have a list of files on an FTP server that I would like to concatenate remotely. They are quite large, so I would prefer not to download them. The reason I'm in this situation is because I ...
moinudin's user avatar
  • 3,074
6 votes
1 answer
1k views

Successfully concatenating multiple videos

My mission is to create videos out of old web slideshows. To start with I have jpegs and audio files that worked as Flash slideshows in an old system, structured such as this: Audio structure ...
user avatar
5 votes
1 answer
9k views

How do I append dynamic number of spaces at the end of a string in a batch file

I want to output information to a log file as such 01/08/2013 14:30 - Dynamic-Machine-Name - Message starts 02/08/2013 07:12 - DynamicMachineName - Log entry 02/08/2013 07:14 - Dynamic-PC-...
Ghandi Manning's user avatar
4 votes
2 answers
15k views

How to concat String, File Contents, and String in bash script?

I have a file which contains only one line $> cat file.txt apple,orange,cat,dog I need to append two String to it and assign it to a variable, one in front and another in the end, so that it ...
FGH's user avatar
  • 41
4 votes
1 answer
1k views

Wrong string concatenation using Bash Windows Subsystem

I'm having headaches to know why my script doesn't work as expected under windows subsystem linux. My version from the store : Debian GNU/Linux 9.6 (stretch) (I tried ubuntu too, with the same ...
waken22's user avatar
  • 43
4 votes
2 answers
2k views

Why do 1920x1080p videos still get stretched and distorted after I concat them?

I have several videos with different aspect ratios. I use this command to put them all within a 1920x1080p frame: ffmpeg -i input -vcodec libx264 -s 1920x1080 -r 30 -strict experimental output This ...
Gramrock's user avatar
4 votes
1 answer
4k views

Concatenate videos with/without audio stream

I have multiple videos in folder, but when first of all hasn't audio stream, audio disappear in concatenated video. Concatenated video is correct if first video has audio stream. How can I concatenate ...
KravAn's user avatar
  • 43
4 votes
2 answers
16k views

Excel Concatenate Time

I have had a look at this site, and across the net, but can't seem to solve this, which should be easy! Concatenate should work, but I wasn't able to make it work. Current spreadsheet looks like this:...
user avatar
4 votes
1 answer
4k views

FFmpeg - Cut video into segments, transcode them individually, then concatenate & output to .ts

This is a follow-up question to audio error when concatenating clips using ffmpeg What I'd like to achieve is the following: Cut an input video into chunks Transcode each chunk (video and audio) ...
user avatar
4 votes
2 answers
6k views

Excel - concatenating cells where reference number matches [duplicate]

I have a worksheet with many rows. Some of the rows share reference numbers (contained in, say, column A). What I'd like to do is, where a row shares a reference number with another row, I'd like to ...
Lewes Dev's user avatar
3 votes
2 answers
2k views

How to concatenate values in Excel?

I have a spreadsheet that looks something like this:    A B C D E ... 1| 1 0 0 1 0 2| 0 1 0 0 1 3| 0 0 0 1 0 4| 1 0 0 0 0 I'd like to concatenate row 1 in column F so that ...
samthebrand's user avatar
3 votes
1 answer
3k views

Windows command to concatenate multiple files in alphabetical/numerical order?

I have several hundred files that need to be concatenated into a single file, much like this question. The problem is, that my files must must be in order. They are named with a Julian date followed ...
mawburn's user avatar
  • 214
3 votes
3 answers
5k views

Command Line : Concatenate multiple files by date

I have got a plenty of .txt files in a directory. The directory also contains .png and some .pdf files. I have successfully concatenated .txt files using this command : @ECHO Off SETLOCAL for /r %%f ...
CodeIt's user avatar
  • 1,819
3 votes
1 answer
1k views

Is there a way in Excel to combine the contents of multiple cells and still leave line breaks?

Consider: +---+----------------------+ | | A | +---+----------------------+ | 1 | Instructions to foo | +---+----------------------+ | 2 | 1.) Foo ...
dwwilson66's user avatar
  • 1,749
3 votes
2 answers
43k views

Concatenating numbers that have leading zeros

I'm trying to combine/concatenate numbers in different columns into one long number. Some of the numbers have leading zeros because of custom formats applied to the cells. When I concatenate them ...
Helpneeded's user avatar
3 votes
1 answer
8k views

Can't concatenate a string inside a batch loop

I've been struggling with this for a while now, and I can't seem to figure out why. I have this batch file: @echo on setlocal enabledelayedexpansion for /F %%x in (FileList.txt) do ( for /L ...
user4450016's user avatar
2 votes
4 answers
7k views

Excel adds quotation marks to the end of my formula

Excel automatically corrects my formula, saying "We found a typo in your formula and tried to correct it to:" =CONCAT(CHAR(34),A4,""":""",D4,"""") My original formula only has three quotation marks ...
Gabriel's user avatar
  • 21
2 votes
2 answers
9k views

how to combine or concatenate two video files with ffmpeg?

I have tried to concatenate 2 video files (avi) into one sigle video: cat input1.avi input2.avi | ffmpeg -f avi -i - -vcodec copy -acodec copy final.avi .. but this does not concatenate the videos. ...
user avatar
2 votes
2 answers
2k views

gunzip multiple files and concatenate in parallel?

Is it possible to gunzip multiple files and concatenate them into one big file, but do it in parallel given a multicore machine? For example, right now I do: gunzip -c file1.gz > final gunzip -c ...
719016's user avatar
  • 4,337
2 votes
2 answers
1k views

Multiple Search Formula in Excel [duplicate]

I am trying to find a formula which will search one cell for specific words. I would like the outcome of the formula to be words I have selected. The example of this I have is if one cell shows the ...
Imi's user avatar
  • 19
2 votes
1 answer
10k views

Concatenate binary files in windows (Without command line)

I'm trying to prepare a process for copying the video files off of a recorded DVD (we made the recording, and it's not encrypted). The method of copying the VTS_*.VOB file works when the recording is ...
Tyzoid's user avatar
  • 137
2 votes
1 answer
4k views

FFmpeg: concatenation without reencoding

I have two *.mpg files. I'd like to concatenate them by picking the video stream (MPEG-2) and the MP2 audio stream. My problem is that the streams are always reencoded. I'd like to avoid this, but I'm ...
user avatar
2 votes
1 answer
2k views

FFMpeg can't concat certain videos

I have some videos recorded with my android phone. They are quite similar. For instance: original0.mp4 original1.mp4 original2.mp4 (this one is broken) I apply this filter to each of them: ffmpeg -...
user1049280's user avatar
2 votes
2 answers
2k views

Merge .txt files in Specific Order

I have a set of 300 chapters named Chapter 1.txt, Chapter 2.txt... Chapter 300.txt] The goal is to try to create a combined .txt file with all of these chapters in order. Each file is formatted with ...
Akshay Iyer's user avatar
2 votes
1 answer
1k views

Invalid file index 3 in filtergraph description -- FFMPEG

I am trying to concat 3 videos and give effetcs using FFMPEG. My below script is giving error. I am not able to understand what is the issue. Which index i am missing. Script below: ffmpeg -i D:\...
D.B.'s user avatar
  • 101
2 votes
1 answer
12k views

Powershell string concatenation of expressions

I'm using a ternary expression as shown in this example: $a = 1 $x = if ($a -eq 1) { "one" } else {"not one" } $t = "The answer is: " + $x write-host $t This works as I would expect. What I would ...
Chris Davies's user avatar
  • 3,799
2 votes
1 answer
268 views

How can I apply cat (UNIX) command individually, to all files in a folder?

Here's the situation: My file A.csv needs to be concatenated individually with all the other *.csv's in the folder and each of the outputs needs to have the same name as the particular *.csv. How ...
ankit's user avatar
  • 123
2 votes
2 answers
23k views

Excel - 'Concatenate' columns with Alt + Enter

I am trying to combine three cells into one, with Alt + Enter or Char(10) separating each value. When I use a simple Excel formula =B2 & Char(10) & C2 & Char(10) & D2 and wrap the text ...
CJK's user avatar
  • 113
2 votes
1 answer
768 views

How can I losslessly concatenate two MP4 files and keep the telemetry information (GoPro GPMF) using FFmpeg?

One may losslessly concatenate two MP4 files using FFmpeg as follows: ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4 with list.txt: file 'C:\file1.mp4' file 'C:\file2.mp4' However, if the ...
Franck Dernoncourt's user avatar
2 votes
1 answer
2k views

Cannot allocate memory - FFMPEG

While giving effects to multiple video using FFMPEG. I am getting error Error while filtering: Cannot allocate memoryme=00:06:02.98 bitrate= 676.0kbits/s dup=22 drop=0 speed=4.58x Failed to inject ...
D.B.'s user avatar
  • 101
2 votes
1 answer
1k views

Concat many video: wrong out FPS & audio Pitch

I have a process like this: i have N input video; I cut & transcode them using the following code: ffmpeg.exe -c:v h264_cuvid -resize 1920x1080 -noaccurate_seek -ss 00:00:04.000 -to 00:00:44.240 -...
Marco Soave's user avatar
2 votes
1 answer
934 views

Trouble automating concatination (merging) of VOB files from DVD with FFMPEG

I have a library of decrypted DVDs, which all have their video in a series of VOB files within the usual VIDEO_TS folder. I wondered if I could use FFMPEG to combine them into a single MPEG files. So ...
Randy's user avatar
  • 131
2 votes
1 answer
824 views

FFmpeg concat mp4 corruption

When I run ffmpeg -f concat -i resizedvideolist.txt -c copy concatenated_time.mp4 2>&1 it concatenates all the videos in the txt, but there is one video around halfway through that get ...
Ethan SK's user avatar
  • 131
2 votes
1 answer
256 views

concatenate files from different subdirectories

I have many subfolders from my current operating directory. In each subfolder, there is a file called "total" "total" contains 2 columns of data, and remember there are many "total" files, each in ...
Jackson Hart's user avatar
2 votes
1 answer
5k views

How to Concatenate Repeating String in Batch Script

I'm trying to concatenate a repeating string depending on the first parameter value passed into the script when it is called. This value represents the number of directory levels the current ...
Jim Fell's user avatar
  • 5,906
2 votes
2 answers
588 views

concatenate files including path in header - path contains spaces

I have to concatenate a number of files in a directory structure which contains spaces in the folder names looking like this: ./CH 0000100014/A10/11XT/11xt#001.csv find . -name "*.csv" -type f -...
manolo's user avatar
  • 23
2 votes
0 answers
24 views

Efficient way to concatenate row titles based on column indicator?

I have a list of ingredients in column A, and different products in columns. The products all consists of different combinations of the same ingredients. In each product's column, there are Y ...
Half-Power User's user avatar
2 votes
0 answers
340 views

forcing ffmpeg to drop audio at same rate it drops video

I've got a number of video files taken over several days on family vacation and I was hoping to combine these all into one 2 hour long file. Some of the source files are from an iPhone, some are from ...
jeremysawesome's user avatar