Pipe for ffmpeg: Settings

Revision as of 19:21, 23 October 2025

Filter interface and command line preparation for Pipe for ffmpeg DirectShow filter.
Interface IAVOPipeFFmpeg can be found in file <filter installation directory>\Idl\PipeFF.idl

Command line

The command line includes the following parts:
<Path to ffmpeg.exe> <INPUT> [<Common options>] [<Coding[0]> ... <Coding[N]>] <Output file>

where:

<Path to ffmpeg.exe> : The full name of the ffmpeg.exe module. Sets by the user. If this field is empty, the search for ffmpeg.exe will be performed in the .exe (application) or .dll (filter) folders.

<INPUT> : Input stream and pipe parameters. These are set by the filter based on the connection media types and predefined parameters.

<Common options>:

• Input stream modifications (resize, aspect ratio, frame rate, sample rate, etc.);
  
• Trimming (start, end, duration, etc.);
  
• Encoding options (encoders, bitrate, profile, etc.);
  
• Additional parameters ("-y" for overwriting, "-loglevel", "-report", etc.);
  

NOTE: ":stream_specifier" must be set according to ffmpeg docs (-c:v, -b:a:1, etc.).
<Common options> part is optional, some parameters can be specified in the <Coding> parts.

   <Coding[n]> : encoding parameters for stream n (for the stream number, only connected pins are taken
       into account). Stream parameters can be retrieved using IAVOPipeFFmpeg::GetPinParams(nPin, ...).
       Features of this part:
       - the codec used can be specified in the first word of this part, the codec name starts
         with a letter, for example: mpeg2video, mpeg4, libx264, aac, ac3, ...
         The codec option and stream_specifier will be automatically added before the codec name,
         for example for video stream 0: "-c:v:0", for audio stream 5: "-c:a:5", etc.
       - partial options are allowed: ":stream_specifier" can be omitted after the option name,
         it will be automatically added for known options (see [:stream_specifier] in ffmpeg docs).
         If ":stream_specifier" is found after the option name, it will be changed to the actual
         "stream_type:additional_stream_specifier" by filter, for example "maxrate
       Examples of <Coding>:
         Video stream 1: "mpeg4 -b 1150k -maxrate 1150k" converted to "-c:v:1 mpeg4 -b:v:1 1150k -maxrate:v:1 1150k"
         Audio stream 2: "mp2 -b 224k" converted to "-c:a:2 mp2 -b:a:2 224k"
         Audio stream 0: "-codec aac -b 128K" converted to "-c:a:0 aac -b:a:0 128K"
       <Coding[n]> parts are optional, parameters can be specified in <Common options>.
   <Output file> : the full name of the output file. The file type is determined by the extension,
       unless changed in the <Common options> part with the "-f" option. This part is mandatory.