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.
Gyan
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