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gst-validate-transcodinggst-validate-transcoding — Tool to test GStreamer transcoding components |
gst-validate-transcoding
[options...] [INPUT-URI] [OUTPUT-URI]
gst-validate-transcoding is tool to create media files transcoding pipelines running inside the GstValidate monitoring infrastructure.
You can for example transcode any media file to Vorbis audio + VP8 video in a WebM container by doing:
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gst-validate-transcoding-1.0 file:///./file.ogg file:///.../transcoded.webm -o 'video/webm:video/x-vp8:audio/x-vorbis' |
gst-validate-transcoding will list every issue encountered during the execution of the transcoding operation in a human readable report like the one below:
issue : buffer is out of the segment range Detected on theoradec0.srcpad at 0:00:00.096556426
Details : buffer is out of segment and shouldn't be pushed. Timestamp: 0:00:25.000 - duration: 0:00:00.040 Range: 0:00:00.000 - 0:00:04.520
Description : buffer being pushed is out of the current segment's start-stop range. Meaning it is going to be discarded downstream without any use
The return code of the process will be 18 in case a CRITICAL
issue has been found.
This is the serialization format of a GstEncodingProfile.
Internally the transcoding application uses GstEncodeBin. gst-validate-transcoding-1.0 uses its own serialization format to describe the GstEncodeBin.profile property of the encodebin.
The simplest serialized profile looks like:
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muxer_source_caps:videoencoder_source_caps:audioencoder_source_caps |
For example to encode a stream into a WebM container, with an OGG audio stream and a VP8 video stream, the serialized GstEncodingProfile will look like:
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video/webm:video/x-vp8:audio/x-vorbis |
You can also set the preset name of the encoding profile using the caps+preset_name syntax as in:
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video/webm:video/x-vp8+youtube-preset:audio/x-vorbis |
Moreover, you can set the presence property of an
encoding profile using the |presence
syntax as in:
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video/webm:video/x-vp8|1:audio/x-vorbis |
This field allows you to specify how many times maximum a GstEncodingProfile can be used inside an encodebin.
You can also use the restriction_caps->encoded_format_caps
syntax to specify the
restriction caps
to be set on a GstEncodingProfile. It corresponds to the
restriction GstCaps to apply before
the encoder that will be used in the profile. The fields present in restriction
caps are properties of the raw stream (that is, before encoding), such as height
and width for video and depth and sampling rate for audio. This property does not
make sense for muxers.
To force a video stream to be encoded with a Full HD resolution (using WebM as the container format, VP8 as the video codec and Vorbis as the audio codec), you should use:
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video/webm:video/x-raw,width=1920,height=1080->video/x-vp8:audio/x-vorbis |
gst-validate-transcoding takes and input URI and an output URI, plus a few options to control how transcoding should be tested.
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Let you set a scenario, it can be a full path to a scenario file
or the name of the scenario (name of the file without the
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List the avalaible scenarios that can be run. |
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The output file to store scenarios details. Implies |
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Inspect the avalaible action types with which to write scenarios if no parameter passed, it will list all avalaible action types otherwize will print the full description of the wanted types. |
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Let you set a config scenario. The scenario needs to be set as
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If an EOS event should be sent to the pipeline if an interrupt is received, instead of forcing the pipeline to stop. Sending an EOS will allow the transcoding to finish the files properly before exiting. |
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Whether to try to force reencoding, meaning trying to only remux if possible, defaults to |