Changes between Version 11 and Version 12 of How to concatenate (join, merge) media files

Timestamp:

01/05/2013 02:15:11 AM (5 months ago)

Author:

evilsoup

Comment:

Added in usage for the concat filter, and did my bit against the dreaded link rot

How to concatenate (join, merge) media files

@@ -6 +6 @@
 == Description ==
 
-The concat demuxer was added to ffmpeg 1.1 . You can read about it in the [http://ffmpeg.org/ffmpeg.html#concat documentation]
+The concat demuxer was added to ffmpeg 1.1 . You can read about it in the [http://ffmpeg.org/ffmpeg-formats.html#concat documentation]
 
 == Instructions ==
 
-Creat a file "mylist.txt" with all the files you want to have concatenated in the following form ( Lines starting with a dash are ignored ) :
+Create a file "mylist.txt" with all the files you want to have concatenated in the following form ( Lines starting with a dash are ignored ) :
 {{{
 # this is a comment
@@ -25 +25 @@
 
 = 2. Concatenation of files with different codecs =
+
+== Description ==
+
+The concat filter is available in recent versions of ffmpeg. [http://ffmpeg.org/ffmpeg-filters.html#concat Here] is the official documentation.
+
+== Instructions ==
+
+This is easiest to explain using an example:
+
+{{{
+ffmpeg -i input1.mp4 -i input2.webm \
+-filter_complex '[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]' \
+-map '[v]' -map '[a]' <encoding options> output.mkv
+}}}
+
+On the -filter_complex line, the following:
+
+{{{
+'[0:0] [0:1] [1:0] [1:1]
+}}}
+
+tells ffmpeg what streams to send to the concat filter; in this case, streams 0 and 1 from input 0 (input1.mp4 in this example), and streams 0 and 1 from input 1 (input2.webm).
+
+{{{
+concat=n=2:v=1:a=1 [v] [a]'
+}}}
+
+This is the concat filter itself. n=2 is telling the filter that there are two input files; v=1 is telling it that there will be one video stream; a=1 is telling it that there will be one audio stream. [v] and [a] are names for the output streams, to allow the rest of the ffmpeg line to use the output of the concat filter.
+
+Note that the single quotes ' ' around the whole filter section are required.
+
+{{{
+-map '[v]' -map '[a]'
+}}}
+
+This tells ffmpeg to use the results of the concat filter rather than the streams directly from the input files.
+
+Note that filters are incompatible with stream copying; you can't use -c copy with this method. Also, I'm not sure whether softsubs are supported.
+
+As you can infer from this example, multiple types of input are supported, anything readable by ffmpeg should work. The inputs have to be of the same frame size, and a handful of other attributes have to match.
+
+= 3. Concatenation of files with different codecs using an external script =
 
 == Description ==