[FFmpeg-user] view mp4 while still encoding?

[Louis Letourneau]

If you encode your mp4 with '*-movflags faststart' it will put the moov
atom at the beginning of the movie. This way ffplay can play it BUT it
won't play it until the end.*
*You'll just see the state of the video when you started ffplay.*

*To see the encoding live until it ends, you need segmented encoding (HLS
or segment muxers) to view the files.*

*You could also use ffserver and split the output to the mp4 file and a
stream and look at the stream. This is a more complicated setup though.,*

*Louis*

On Thu, Jul 14, 2016 at 6:29 AM, Carles Vila <cvilad at gmail.com> wrote:

> Hi all,
>
> Is there an option to be able to view an mp4 (H.264) which is still being
> encoded?
> with mpeg-2 in mpeg container it works, it would be handy for mp4..
> Thanks!
>
> ffplay throws following error:
>
> ffplay movie.mp4
> ffplay version 2.7.2 Copyright (c) 2003-2015 the FFmpeg developers
>   built with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
>   configuration: --prefix=/usr/local/Cellar/ffmpeg/2.7.2_1 --enable-shared
> --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables
> --enable-avresample --cc=clang --host-cflags= --host-ldflags=
> --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc
> --enable-libxvid --enable-libfreetype --enable-libvorbis --enable-libvpx
> --enable-libass --enable-ffplay --enable-libfdk-aac --enable-libopus
> --enable-libquvi --enable-libx265 --enable-libopenjpeg
> --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.2_1/include/openjpeg-1.5 '
> --enable-nonfree --enable-vda
>   libavutil      54. 27.100 / 54. 27.100
>   libavcodec     56. 41.100 / 56. 41.100
>   libavformat    56. 36.100 / 56. 36.100
>   libavdevice    56.  4.100 / 56.  4.100
>   libavfilter     5. 16.101 /  5. 16.101
>   libavresample   2.  1.  0 /  2.  1.  0
>   libswscale      3.  1.101 /  3.  1.101
>   libswresample   1.  2.100 /  1.  2.100
>   libpostproc    53.  3.100 / 53.  3.100
> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fabdc02b400] moov atom not found0/0
> movie.mp4: Invalid data found when processing input
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