How do I find the length of media with gstreamer?

Question

How do I find the playback time of media with gstreamer?

Answer 1

Here's a simple Python script to get the duration of anything gstreamer can decode. Note that all times in gstreamer are in nanoseconds.

duration.py:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import division

import sys
import gobject
gobject.threads_init()
import pygst
pygst.require("0.10")
import gst
d = gst.parse_launch("filesrc name=source ! decodebin2 ! fakesink")
source = d.get_by_name("source")
source.set_property("location", sys.argv[1])
d.set_state(gst.STATE_PLAYING)
d.get_state()
format = gst.Format(gst.FORMAT_TIME)
duration = d.query_duration(format)[0]
d.set_state(gst.STATE_NULL)

import datetime
delta = datetime.timedelta(seconds=(duration / gst.SECOND))
print delta

Examples:

$ python duration.py VIDEO_TS/VTS_03_1.VOB
0:20:10.528000
$ python duration.py ~/Movies/BigBuckBunny_640x360.m4v
0:09:56.461667

Answer 2

Why re-invent the wheel?
Use:
gst-discoverer-1.0 filename
or
gst-discoverer-0.10 filename

Depending on the file type you may want to add " | grep Duration" to avoid the tags which can be lengthy.
For the ridding of extraneous tags for video,flac and mp3 files this should do the trick by using grep to exclude them.
gst-discoverer-1.0 filename | grep -v Tags | grep -v ID3v2 | grep -v image | grep -v attachment

Answer 3

See Section 6.5.

http://majorsilence.com/pygtk_audio_and_video_playback_gstreamer

It avoids need to create a pipeline and run it manually.

Answer 4

Adding on to the answer for gstreamer greater then 1.16. Using GstPbutils and Discoverer we can query duration and other attributes as well. Full API here

import gi
gi.require_version("GstPbutils", "1.0")
from gi.repository import GstPbutils

def get_file_duration(file: Path) -> timedelta:
    discoverer = GstPbutils.Discoverer()
    asset_info = discoverer.discover_uri(str(file_path.as_uri()))
    duration_in_microseconds = int(asset_info.get_duration() / 1000)
    return timedelta(microseconds=duration_in_microseconds)