Merge multiple webm files using avconv
Download
The first step is to download ffmpeg
. It's a standalone binary so you don't need to install it. Just execute it directly.
Your (expired) Ubuntu version offers avconv
which is missing many features including several concatenation functions.
Concatenate
Use the concat demuxer if you want to attempt to join them with no re-encoding. All videos must have the same parameters.
Use the concat filter if the videos vary in width, height, frame rate, etc. The filter will require re-encoding.
Note: You never did provide the info I requested a year and a half ago in my comments to your question, so I can't suggest which one you specifically need to use. Also, I can't provide examples specific to your inputs without this info, so the following examples are generic and may not work without additional options.
concat demuxer
Make a text file listing your inputs:
file 'input0.webm'
file 'input1.webm'
file 'input2.webm'
Now run ffmpeg
:
ffmpeg -f concat -i input.txt -c copy output.webm
concat filter
In this example input1.webm
has a bigger width x height than the others. This example command will scale input1.webm
so it matches the other videos:
ffmpeg -i input0.webm -i input1.webm -i input2.webm -filter_complex \
"[1:v]scale=640:-1[v1]; \
[0:v][0:a][v1][1:a][2:v][2:a]concat=n=3:v=1:a=1[v][a]" \
-map "[v]" -map "[a]" output.webm
Also see
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Mandar Pandit
Recognized Problem Solver with over 12 years of Experience delivering technology solutions for clients in a variety of business domains. Highly Skilled in Technical Analysis and Design, Problem Study and convert Solutions into working Application Prototypes. Specialized expertise in conceptualizing, modeling with Domain-Driven-Design concepts, and constructing JEE web-based solutions using open-source Frameworks, SOA, Web-Services SOAP and REST, and Microservices. Java, Spring Boot and Spring Cloud Ecosystem, NodeJS Ecosystem. Hobbyist Photographer, Innovative, #SOreadytohelp
Updated on September 18, 2022Comments
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Mandar Pandit over 1 year
I have multiple
.webm
files in one location, say as inside video folder. I'm using Ubuntu 13.10 32bit system. I want to merge all my webm files in oneoutput.webm
file.I have read about
ffmpeg
, but when I triedffmpeg
with concat function I got:Unknown input format: 'concat'
; And ffmpeg is deprecated and use avconv instead.Please suggest how to use
avconv
for merging multiple webm files to one.-
llogan over 9 yearsThe fake
ffmpeg
from Libav is what was deprecated foravconv
; notffmpeg
from FFmpeg. Unfortunately the maintainer refused to clarify that in the message resulting in confused users (and some think it was the intended effect). -
llogan over 9 yearsPlease download a recent ffmpeg build and then show some info about your inputs. It will help me provide an answer, and
avconv
doesn't have the functionality of what I'm going to suggest. Include the full output of:ffmpeg -i input0.webm -i input1.webm -i input2.webm
, etc. -
andrew.46 almost 8 years2 questions: 1. Which version of Ubuntu are you using? 2. What are the file names of your webm files?
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Mandar Pandit almost 8 yearsUbuntu is 13.10 32bit. No specific file names yet, you can just take file names as
one.webm
,two.webm
,three.webm
etc. and merge them intomerged.webm
. -
llogan almost 8 years@MandarPandit Support for Ubuntu 13.10 ended on 17 July 2014. You should upgrade to a supported version.
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user.dz almost 8 yearsIf you are not strict about tools, see with
mencoder -oac copy -ovc copy -of lavf -o merged.webm one.webm, two.webm, three.webm
. The only thing I noticed is the time shrink may be a bug or I'm missing something. -
user.dz almost 8 years@LordNeckbeard, You are right in 16.04 it is just a link to
ffmpeg
. In 14.04, even-i concat:..|..|.."
didn't work for me, and the only solution I could get it to work ismencoder
as mentioned in the above comment. May be compiling ffmpeg from source is an option. -
llogan almost 8 years@Sneetsher I'm guessing the concat demuxer as you suggested will work with Ubuntu 15.04 and above because that's when
ffmpeg
returned to the repositories.
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user.dz almost 8 yearsNice to know about the static build availability , :) that's really helpful.
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llogan almost 8 years@Sneetsher If only someone will provide a variety of ARM builds for all of those Android users on Stack Overflow...we would see far fewer outdated 2.4.2 builds (not sure where they're all getting it from).
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andrew.46 almost 8 years@LordNeckbeard: Your neck beard is indeed long :)