[FFmpeg-user] about flv file metadata

[Carl Eugen Hoyos]

esolve esolve <esolvepolito <at> gmail.com> writes:

> ffmpeg version 0.8.12, Copyright (c) 2000-2011

This is too old, please update.

> [flv @ 0x1e5f600] Estimating duration from bitrate, this may be inaccurate

(After reading my comment below, also note above line.)

> Input #0, flv, from 'youtube_1.flv':
>   Metadata:
>     duration        : 205
>     starttime       : 0
>     totalduration   : 205
>     width           : 640
>     height          : 360
>     videodatarate   : 741
>     audiodatarate   : 117
>     totaldatarate   : 864
>     framerate       : 25
>     bytelength      : 22177678
>     canseekontime   : true
>     sourcedata      : BADC214C5HH1349887655671782
>     purl            :
>     pmsg            :
>   Duration: 00:03:24.72, start: 0.000000, bitrate: 878 kb/s

Regarding your original question:
Please look at the indentation - "Metadata" is something 
that the encoder wrote into the file header, 
the line that starts with "Duration" has nothing to do 
with metadata, but these are FFmpeg's assumptions about 
the file (that may or may not be correct).

To know the actual length of a file, it is usually necessary 
to decode it.

Please do not top-post here, Carl Eugen