Hi Carl, > On Sep 13, 2016, at 2:57 PM, Carl Eugen Hoyos <ceffm...@gmail.com> wrote: > > 2016-09-12 19:47 GMT+02:00 Monique Lassere <lasse...@gmail.com>: >> Trying to dig as deeply as possible into ffprobe's probe score >> and how it is calculated. > > Is there a use case that could be interesting to us?
I think the use case if for when an archive accepts a large diverse collection for preservation to access probe_score per file. A lower probe_score may indicate that the file is broken, misnamed, mis-categorized, which could mean that creation of derivatives or long-term handling may need closer review. In a related conversation about probe score I tested 2000+ random files and made this histogram: rate of occurrence, format name and probe_score. 149 "matroska,webm",100 672 "mov,mp4,m4a,3gp,3g2,mj2",100 1 aac,1 1 aac,25 1 adp,25 15 aiff,100 4 asf,100 8 avi,100 919 caf,100 45 dv,75 2 ea,100 1 flac,1 1 flac,13 4 flac,50 8 flv,100 3 mp3,25 90 mp3,51 9 mpeg,26 8 mpeg,52 1 mpegts,50 1 mpegvideo,12 13 mpegvideo,51 11 mxf,100 1 ogg,100 2 rm,100 1 swf,100 5 swf,26 92 wav,99 So for instance perhaps worth a closer look at the mpegvideo with score of 12 or the flac file with score of 1(!), before moving the file into long term storage. > Or a bug you want to tell us about? > > [...] > >> 2. Secondly, does the probe score relate to the container format only? > > As Michael said, yes. > Note that some containers (like H.264 Annex B or ADTS) correspond > to a codec, so for containers that "allow" random codecs (like mpeg > streams) the same probe functions that allow detecting formats can > be used to detect codecs. [...] Best Regards, Dave Rice _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
