[FFmpeg-user] mp4 concat demuxer problem
kk_konrad at gmx.at
Tue May 6 10:34:36 CEST 2014
On Sun, May 04, 2014 at 11:58:21AM +0200, Nicolas George wrote:
> Le nonidi 9 flor?al, an CCXXII, Konrad Karl a ?crit?:
> > ffmpeg -f concat -i concat-test -c copy out.mp4
> > The output file fails to play after the first input file (mplayer, ffplay, vlc)
> Can you test the new "-auto_convert 1" option to the concat demuxer and see
> if it helps things? Note that the output will be in "annex B" format, and
> needs an extra BSF to be muxed to MP4.
works fine (using git 421b21ca8a):
ffmpeg -y -auto_convert 1 -f concat -i concat-list.txt -c copy out.mp4
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0xe08de0] Auto-inserting h264_mp4toannexb
[concat @ 0xdffd80] Estimating duration from bitrate, this may be
Input #0, concat, from 'concat-list.txt':
Q1: what would have been the proper command line before the invention of -auto_convert ?
Q2: the -auto-convert description says: .... This is necessary in particular
if there are resolution changes.... : I am failing to notice any
resolution changes, so where/how they are hiding?
> Nicolas George
More information about the ffmpeg-user