On 23/11/15 18:06, Maximilian Berthold wrote:
Hi,
my name is Max, I am a student from Germany, working on an algorithm for
detection of Blocking artefacts.
Is there a comprehensible tutorial on how to get started with avprobe?
avprobe is a quite simple tool to print information about media streams.
it is mainly
avprobe [options] [‘input_file’]
where options (as documented [here][1])
‘-f format’
Force format to use.
‘-of formatter’
Use a specific formatter to output the document. The following
formatters are available
‘ini’
‘json’
‘old’
Pseudo-INI format that used to be the only one available in old
avprobe versions.
‘-unit’
Show the unit of the displayed values.
‘-prefix’
Use SI prefixes for the displayed values. Unless the
"-byte_binary_prefix" option is used all the prefixes are decimal.
‘-byte_binary_prefix’
Force the use of binary prefixes for byte values.
‘-sexagesimal’
Use sexagesimal format HH:MM:SS.MICROSECONDS for time values.
‘-pretty’
Prettify the format of the displayed values, it corresponds to the
options "-unit -prefix -byte_binary_prefix -sexagesimal".
‘-show_format’
Show information about the container format of the input multimedia
stream.
All the container format information is printed within a section
with name "FORMAT".
‘-show_format_entry name’
Like ‘-show_format’, but only prints the specified entry of the
container format information, rather than all. This option may be given
more than once, then all specified entries will be shown.
‘-show_packets’
Show information about each packet contained in the input
multimedia stream.
The information for each single packet is printed within a
dedicated section with name "PACKET".
‘-show_streams’
Show information about each media stream contained in the input
multimedia stream.
Each media stream information is printed within a dedicated section
with name "STREAM".
for example
avprobe -of json -pretty -show_format -show_streams sintel.mkv
produces something such as
{ "format" : {
"filename" : "sintel.mkv",
"nb_streams" : 12,
"format_name" : "matroska,webm",
"format_long_name" : "Matroska / WebM",
"start_time" : "0:00:00.000000",
"duration" : "0:14:48.032000",
"size" : "4.197Gibyte",
"bit_rate" : "0bit/s"
},
"streams" : [
{
"index" : 0,
"codec_name" : "h264",
"codec_long_name" : "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
"codec_type" : "video",
"codec_time_base" : "1/48",
"codec_tag_string" : "[0][0][0][0]",
"codec_tag" : "0x0000",
"profile" : "High",
"width" : 4096,
"height" : 1744,
"coded_width" : 4096,
"coded_height" : 1744,
"has_b_frames" : 2,
"sample_aspect_ratio" : "1:1",
"display_aspect_ratio" : "256:109",
"pix_fmt" : "yuv420p",
"level" : 51,
"color_range" : "tv",
"color_space" : "bt709",
"color_trc" : "unknown",
"color_pri" : "unknown",
"chroma_loc" : "left",
"avg_frame_rate" : "24/1",
"time_base" : "1/1000",
"start_time" : "0:00:00.000000",
"duration" : "N/A",
"tags" : {
"language" : "eng"
}
},
{
"index" : 1,
"codec_name" : "ac3",
"codec_long_name" : "ATSC A/52A (AC-3)",
"codec_type" : "audio",
"codec_time_base" : "1/48000",
"codec_tag_string" : "[0][0][0][0]",
"codec_tag" : "0x0000",
"sample_rate" : "48.000KHz",
"channels" : 6,
"bits_per_sample" : 0,
"avg_frame_rate" : "0/0",
"bit_rate" : "640.000Kbit/s",
"time_base" : "1/1000",
"start_time" : "0:00:00.000000",
"duration" : "N/A",
"tags" : {
"language" : "eng",
"title" : "AC3 5.1 @ 640 Kbps"
}
},
...
lu
[1] https://libav.org/documentation/avprobe.html#Main-options
_______________________________________________
libav-tools mailing list
[email protected]
https://lists.libav.org/mailman/listinfo/libav-tools
