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tutorials: basic: update gstreamer-tools.md

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For the use of matroskademux plugin, the PAD template has changed to
video_%u and audio_%u which generate video_0 and audio_0, respectively.
So the current example using old pad names(video_00/audio_00) causes the
failure in linking pads. This patch changes the pad names into correct
ones.
This commit is contained in:
Siwon Kang 2020-04-07 19:34:22 +09:00 committed by Thibault Saunier
parent d894a444a8
commit 27487bf133
1 changed files with 4 additions and 4 deletions
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8
markdown/tutorials/basic/gstreamer-tools.md
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@ -144,14 +144,14 @@ stream out of a
demuxer:
```
gst-launch-1.0 souphttpsrc location=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm ! matroskademux name=d d.video_00 ! matroskamux ! filesink location=sintel_video.mkv
gst-launch-1.0 souphttpsrc location=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm ! matroskademux name=d d.video_0 ! matroskamux ! filesink location=sintel_video.mkv
```
This fetches a media file from the internet using `souphttpsrc`, which
is in webm format (a special kind of Matroska container, see [](tutorials/basic/concepts.md)). We
then open the container using `matroskademux`. This media contains both
audio and video, so `matroskademux` will create two output Pads, named
`video_00` and `audio_00`. We link `video_00` to a `matroskamux` element
`video_0` and `audio_0`. We link `video_0` to a `matroskamux` element
to re-pack the video stream into a new container, and finally link it to
a `filesink`, which will write the stream into a file named
"sintel\_video.mkv" (the `location` property specifies the name of the
@ -162,7 +162,7 @@ new matroska file with the video. If we wanted to keep only the
audio:
```
gst-launch-1.0 souphttpsrc location=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm ! matroskademux name=d d.audio_00 ! vorbisparse ! matroskamux ! filesink location=sintel_audio.mka
gst-launch-1.0 souphttpsrc location=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm ! matroskademux name=d d.audio_0 ! vorbisparse ! matroskamux ! filesink location=sintel_audio.mka
```
The `vorbisparse` element is required to extract some information from
@ -194,7 +194,7 @@ gst-launch-1.0 souphttpsrc location=https://www.freedesktop.org/software/gstream
This is the same media file and demuxer as in the previous example. The
input Pad Caps of `filesink` are `ANY`, meaning that it can accept any
kind of media. Which one of the two output pads of `matroskademux` will
be linked against the filesink? `video_00` or `audio_00`? You cannot
be linked against the filesink? `video_0` or `audio_0`? You cannot
know.
You can remove this ambiguity, though, by using named pads, as in the