[FFmpeg-user] unable to convert png to movie, error: Invalid PNG signature ,

[Puneet Singh]

Hi ,
While compiling from sources on linux platform ,i set CFLAG/CXXFLAG to
-fPIC. For ffmpeg -fPIC is not necessary (as libraries are static).

How you were able to detect the image compression format information (jpeg)
from the attached image files?
Also , i tried
ffmpeg  -r 1 -vcodec mjpeg -i image%2d.png -vcodec libx264 -pix_fmt yuv420p
video.mp4
and i am stuck at:

ffmpeg version 3.2.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-11)
  configuration: --prefix=/home/apps/FFMPEG/3.2.1/gnu --extra-cflags=-fPIC
--extra-cxxflags=-fPIC --enable-libx264 --enable-gpl
  libavutil      55. 34.100 / 55. 34.100
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.100 / 57. 56.100
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Input #0, image2, from 'image%2d.png':
  Duration: 00:00:00.20, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
481x480 [SAR 1:1 DAR 481:480], 25 fps, 25 tbr, 25 tbn, 25 tbc
[swscaler @ 0x225d5c0] deprecated pixel format used, make sure you did set
range correctly
[libx264 @ 0x2248380] *width not divisible by 2* (481x480)
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Error while opening encoder for output stream #0:0 - *maybe incorrect
parameters such as bit_rate, rate, width or height*


Thanks & Regards,
Puneet

On 2 December 2016 at 16:51, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> 2016-12-02 11:22 GMT+01:00 Puneet Singh <singh.punit1990 at gmail.com>:
>
> > I am trying to convert a set of images to a video file. I have tried
> > various ffmpeg command options but they all have failed.
>
> > ffmpeg -r 1 -i image%02d.png
>
> Since your files are actually jpeg, not png, you have to force the
> right decoder:
> $ ffmpeg -r 1 -vcodec mjpeg -i image%2d.png
>
> > --extra-cflags=-fPIC
>
> Why do you think that this makes sense?
>
> Please remember that on this mailing list, only current
> FFmpeg git head is supported.
>
> Carl Eugen
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".