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- + + @@ -60,12 +61,11 @@Many FFmpeg commands use filters that manipulate the video or audio stream in some way: for example, hflip to horizontally flip a video, or amerge to merge two or more audio tracks into a single stream.
+The use of a filter is signalled by the flag -vf (video filter) or -af (audio filter), followed by the name and options of the filter itself. For example, take the convert colourspace command:
ffmpeg -i input_file -c:v libx264 -vf colormatrix=src:dst output_file
+
Here, colormatrix is the filter used, with src and dst representing the source and destination colourspaces. This part following the -vf is a filtergraph.
It is also possible to apply multiple filters to an input, which are sequenced together in the filtergraph. A chained set of filters is called a filter chain, and a filtergraph may include multiple filter chains. Filters in a filterchain are separated from each other by commas (,), and filterchains are separated from each other by semicolons (;). For example, take the inverse telecine command:
ffmpeg -i input_file -c:v libx264 -vf "fieldmatch,yadif,decimate" output_file
Here we have a filtergraph including one filter chain, which is made up of three video filters.
+It is often prudent to enclose your filtergraph in quotation marks; this means that you can use spaces within the filtergraph. Using the inverse telecine example again, the following filter commands are all valid and equivalent: +
-vf fieldmatch,yadif,decimate-vf "fieldmatch,yadif,decimate"-vf "fieldmatch, yadif, decimate"-vf fieldmatch, yadif, decimate is not valid.
+ The ordering of the filters is significant. Video filters are applied in the order given, with the output of one filter being passed along as the input to the next filter in the chain. In the example above, fieldmatch reconstructs the original frames from the inverse telecined video, yadif deinterlaces (this is a failsafe in case any combed frames remain, for example if the source mixes telecined and real interlaced content), and decimate deletes duplicated frames. Clearly, it is not possible to delete duplicated frames before those frames are reconstructed.
-filter_complex instead of -vf.For more information, check out the FFmpeg wiki Filtering Guide.
+ +Many FFmpeg commands use filters that manipulate the video or audio stream in some way: for example, hflip to horizontally flip a video, or amerge to merge two or more audio tracks into a single stream.
-The use of a filter is signalled by the flag -vf (video filter) or -af (audio filter), followed by the name and options of the filter itself. For example, take the convert colourspace command:
ffmpeg -i input_file -c:v libx264 -vf colormatrix=src:dst output_file
-
Here, colormatrix is the filter used, with src and dst representing the source and destination colourspaces. This part following the -vf is a filtergraph.
It is also possible to apply multiple filters to an input, which are sequenced together in the filtergraph. A chained set of filters is called a filter chain, and a filtergraph may include multiple filter chains. Filters in a filterchain are separated from each other by commas (,), and filterchains are separated from each other by semicolons (;). For example, take the inverse telecine command:
ffmpeg -i input_file -c:v libx264 -vf "fieldmatch,yadif,decimate" output_file
Here we have a filtergraph including one filter chain, which is made up of three video filters.
-It is often prudent to enclose your filtergraph in quotation marks; this means that you can use spaces within the filtergraph. Using the inverse telecine example again, the following filter commands are all valid and equivalent: -
-vf fieldmatch,yadif,decimate-vf "fieldmatch,yadif,decimate"-vf "fieldmatch, yadif, decimate"-vf fieldmatch, yadif, decimate is not valid.
- The ordering of the filters is significant. Video filters are applied in the order given, with the output of one filter being passed along as the input to the next filter in the chain. In the example above, fieldmatch reconstructs the original frames from the inverse telecined video, yadif deinterlaces (this is a failsafe in case any combed frames remain, for example if the source mixes telecined and real interlaced content), and decimate deletes duplicated frames. Clearly, it is not possible to delete duplicated frames before those frames are reconstructed.
-filter_complex instead of -vf.For more information, check out the FFmpeg wiki Filtering Guide.
- -