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jeanlf edited this page Dec 5, 2019 · 12 revisions

HOME » Filters » Probe source

Probe source

Register name used to load filter: probe

The Probe filter is used by applications (typically MP4Box) to query demuxed pids available in a source chain.
The filter does not produce any output nor feedback, it is up to the app developper to query input pids of the prober and take appropriated decisions.


log (string, default: stderr, minmax: fileName, stderr or stdout): set inspect log filename
mode (enum, default: pck): dump mode

  • pck: dump full packet
  • blk: dump packets before reconstruction
  • frame: force reframer
  • raw: dump source packets without demuxing

interleave (boolean, default: true): dump packets as they are received on each pid. If false, report per pid is generated
deep (boolean, default: false): dump packets along with PID state change, implied when fmt is set
props (boolean, default: true): dump packet properties, ignored when fmt is set (see filter help)
dump_data (boolean, default: false, updatable): enable full data dump (WARNING heavy!), ignored when fmt is set (see filter help)
fmt (string, updatable): set packet dump format (see filter help)
hdr (boolean, default: true): print a header corresponding to fmt string without '$ 'or "pid."
allp (boolean, default: false): analyse for the entire duration, rather than stoping when all pids are found
info (boolean, default: false): monitor PID info changes
pcr (boolean, default: false): dump M2TS PCR info
speed (number, default: 1.0): set playback command speed. If speed is negative and start is 0, start is set to -1
start (number, default: 0.0): set playback start offset. Negative value means percent of media dur with -1 <=> dur
dur (fraction, default: 0/0): set inspect duration
analyze (boolean, default: false): analyze sample content (NALU, OBU)
xml (boolean, default: false): use xml formatting (implied if (-analyze]() is set) and disable fmt
fftmcd (boolean, default: false): consider timecodes use ffmpeg-compatible signaling rather than QT compliant one
test (enum, default: no): skip predefined set of properties, used for test mode

  • no: no properties skipped
  • noprop: all properties/info changes on pid are skipped, only packets are dumped
  • network: URL/path dump, cache state, file size properties skipped (used for hashing network results)
  • encode: same as network plus skip decoder config (used for hashing encoding results)

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GPAC Configuration

Configuration File
Global Options

Filters Overview

General Filters Concepts
gpac General Usage
Built-in Properties

Filters Help

Inspect packets (inspect)
Probe source (probe)
Compositor (compositor)
ISOBMFF/QT demuxer (mp4dmx)
MPEG-4 BIFS decoder (bifsdec)
MPEG-4 OD decoder (odfdec)
File input (fin)
BT/XMT/X3D loader (btplay)
HTTP input (httpin)
SVG loader (svgplay)
JPG/J2K/PNG/BMP reframer (rfimg)
PNG/JPG decoder (imgdec)
ADTS reframer (rfadts)
LATM reframer (rflatm)
MP3 reframer (rfmp3)
FAAD decoder (faad)
MAD decoder (maddec)
XVid decoder (xviddec)
OpenJPEG2000 decoder (j2kdec)
AC3 reframer (rfac3)
A52 decoder (a52dec)
AMR/EVRC reframer (rfamr)
OGG demuxer (oggdmx)
Vorbis decoder (vorbisdec)
Theora decoder (theoradec)
MPEG-2 TS demuxer (m2tsdmx)
UDP/TCP input (sockin)
OpenSVC decoder (osvcdec)
VideoToolBox decoder (vtbdec)
MPEG-4 LASeR decoder (lsrdec)
SAF demuxer (safdmx)
MPEG-DASH and HLS client (dashin)
CENC decryptor (cdcrypt)
CENC encryptor (cecrypt)
ISOBMFF/QT muxer (mp4mx)
QCP reframer (rfqcp)
H263 reframer (rfh263)
M1V/M2V/M4V reframer (rfmpgvid)
NHNT reader (nhntr)
NHML parser (nhmlr)
AVC/HEVC reframer (rfnalu)
MPEG PS demuxer (m2psdmx)
AVI demuxer (avidmx)
Subtitle loader (txtin)
TTXT/TX3G decoder (ttxtdec)
WebVTT decoder (vttdec)
RTP/RTSP/SDP input (rtpin)
File output (fout)
Raw AAC to LATM writer (uflatm)
ADTS writer (ufadts)
Media Reframer (reframer)
Stream to file (writegen)
AVC/HEVC to AnnexB writer (ufnalu)
QCP writer (writeqcp)
WebVTT writer (writevtt)
NHNT writer (nhntw)
NHML writer (nhmlw)
VobSub demuxer (vobsubdmx)
AVI muxer (avimx)
Audio output (aout)
M4V writer (ufm4v)
Audio resampler (resample)
Video output (vout)
Video crop (vcrop)
Video flip (vflip)
RAW video reframer (rfrawvid)
PCM reframer (rfpcm)
JPG encoder (jpgenc)
PNG encoder (pngenc)
Audio/Video rewinder (rewind)
Sources concatenator (flist)
MPEG-2 TS muxer (m2tsmx)
DASH and HLS segmenter (dasher)
HEVC tile aggregator (tileagg)
pipe input (pin)
pipe output (pout)
GSF Muxer (gsfmx)
GSF Demuxer (gsfdmx)
UDP/TCP output (sockout)
AV1/IVF/VP9 reframer (rfav1)
IVF/OBU/annexB writer (ufobu)
ATSC input (atscin)
RTP Streamer (rtpout)
RTSP Server (rtspout)
HTTP Server (httpout)
HEVC tile spliter (hevcsplit)
HEVC Tile merger (hevcmerge)
FLAC reframer (rfflac)
ProRes reframer (rfprores)
MPEG Transport Stream splitter (tssplit)
FFMPEG demuxer (ffdmx)
FFMPEG decoder (ffdec)
FFMPEG AV Capture (ffavin)
FFMPEG video rescaler (ffsws)
FFMPEG encoder (ffenc)
FFMPEG muxer (ffmx)
FFMPEG AVFilter (ffavf)
JavaScript filter (jsf)
OpenHEVC decoder (ohevcdec)

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