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ffprobe [2019-09-24 00:38:09]
mi [Check Volume]
ffprobe [2023-06-08 15:10:59] (current)
mi [Show video format]
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 The normal text output of ''​ffprobe''​ goes to stderr, so you usually need to add ''​2>&​1''​ to parse the output. The alternative is to use the complex ffprobe options to format the output which then goes to stdout. The normal text output of ''​ffprobe''​ goes to stderr, so you usually need to add ''​2>&​1''​ to parse the output. The alternative is to use the complex ffprobe options to format the output which then goes to stdout.
  
 +Start with a look at this page: https://​trac.ffmpeg.org/​wiki/​FFprobeTips
 +
 +===== Show metadata tags=====
 +
 +  ffprobe -v quiet "​$in"​ -print_format json -show_entries stream_tags:​format_tags
 + 
 +(for ''​-print_format'',​ there is also ''​flat'',​ ''​xml'',​ ''​csv'',​ etc.)
 +
 +===== Show video format=====
 +
 +  ffprobe -v warning -select_streams v -show_entries stream=codec_name,​height,​width,​pix_fmt -of csv=p=0 "​$in"​
 +
 +===== Has alpha channel? =====
 +
 +https://​stackoverflow.com/​questions/​69029439/​a-good-way-to-detect-alpha-channel-in-a-video-using-ffmpeg-ffprobe
 +
 +<code bash>for f in *.mov; do
 +  pixfmt=$(ffprobe -v 0 -select_streams v:0 -show_entries stream=pix_fmt -of compact=p=0:​nk=1 "​$f"​)
 +  alpha=$(ffprobe -v 0 -show_entries pixel_format=name:​flags=alpha -of compact=p=0 ​ | grep "​$pixfmt|"​ | grep -oP "​(?<​=alpha=)\d"​)
 +  if (( alpha )); then echo "$f : yes, has alpha";​ else echo "$f : NO"; fi
 +done
 +</​code>​
 ===== List audio tracks ===== ===== List audio tracks =====
  
-  ffprobe "​$in"​ 2>&1 | perl -nle '/​^\s+Stream #(\d+:\d+): Audio/ && print $1'+  ffprobe "​$in"​ 2>&1 | perl -nle '/​^\s+Stream #(\d+:\d+).*?: Audio/ && print $1'
   ​   ​
 with codec and number of channels: with codec and number of channels:
  
-  ffprobe "​$in"​ 2>&1 | perl -nle '/​^\s+Stream #(\d+:\d+): Audio: (\S+).*(\d+)\s+channels/​ && print join("​\t",​ $1, $2, $3)'+  ffprobe "​$in"​ 2>&1 | perl -nle '/​^\s+Stream #(\d+:\d+).*?: Audio: (\S+).*(?:(\d+)\s+channels)?/ && print join("​\t",​ $1, $2, $3)'
  
 or to have the tracks in a Bash array: or to have the tracks in a Bash array:
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 or the "​official"​ way: or the "​official"​ way:
  
-  ffprobe -select_streams a -show_entries stream=index -of csv=p=0 "​$in"​+  ffprobe ​-v quiet -select_streams a -show_entries stream=index -of csv=p=0 "​$in"​
   ​   ​
-  ffprobe -select_streams a -show_entries stream=index,​codec_name,​channels -of csv=p=0 "​$in"​+  ffprobe ​-v quiet -select_streams a -show_entries stream=index,​codec_name,​channels -of csv=p=0 "​$in"​
   ​   ​
-  audio_tracks=( $(ffprobe -select_streams a -show_entries stream=index -of csv=p=0 "​$in"​) )+  audio_tracks=( $(ffprobe ​-v quiet -select_streams a -show_entries stream=index -of csv=p=0 "​$in"​) ) 
 + 
 +===== List subtitles ===== 
 + 
 +  ffprobe -v quiet -select_streams s -show_entries stream=index,​codec_name:​stream_tags=language -of csv=p=0 "​$in"​ 
 + 
 +(but for mkv, better see [[mkv]]) 
  
 ===== Check Volume ===== ===== Check Volume =====
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 ===== Other options ===== ===== Other options =====
  
-       -sections +<​code>​ 
-           ​Print sections structure and section information,​ and exit. The output is not meant to be parsed by a machine+-sections 
- +    Print sections structure and section information,​ and exit. The output is not meant to be parsed by a machine.
-       ​-show_data_hash algorithm +
-           Show a hash of payload data, for packets with -show_packets and for codec extradata with -show_streams.+
  
 +-show_data_hash algorithm
 +    Show a hash of payload data, for packets with -show_packets and for codec extradata with -show_streams.
 +</​code>​
  
   ​   ​
/docs/dokuwiki/data/attic/ffprobe.1569278289.txt.gz · Last modified: 2019-09-24 00:38:09 by mi