lör 2018-07-28 klockan 10:31 +0530 skrev Gyan Doshi: > > On 28-07-2018 03:33 AM, Tomas Härdin wrote: > > > > woot! I didn't know the mov demuxer dumped such things. It is quite > > slow however, since it will scan through every leaf atom in the > > file. > > For example, running time ffmpeg -i input.mov -v 56 2>&1 | wc on a > > 1.5 > > GiB MP4 on an SSD takes: > > Use the subfile protocol to forgo parsing the whole file, e.g. > > ffmpeg -i subfile,,start,0,end,10000,,:in.mp4 -v 56 2>&1 | grep > -e > "type:'moov'" -e "type:'mdat'" | head -1 | grep moov > > This assumes that at least one of the two targeted boxes moov/mdat > start > within the first 10000 bytes.
Neat. This is similar to the first suggestion I had to the peertube devs, dd:ing off the first MiB or so then probing that. We'll see what they say, and what Baptiste thinks I guess /Tomas _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
