[Ffmpeg-devel] [ppm @ 0x40415168]picture size invalid (1x0)

[Víctor Paesa]

Hi,

> I tried to pipe a stream of ppm file into ffmpeg to create a video.
> However, the following command sequence causes ffmpeg to complain about
> an invalid picture size and produces a video which is garbled after some
> time.
>
>> convert -size 160x128 -depth 8 xc:white white.ppm
>> i=0
>> while [ $((i<10000)) == 1 ]; do let i=$((i+1)); cat white.ppm ; done |
> ffmpeg -f image2pipe -vcodec ppm -i - -s 160x128 -r 25 -b 90 -f
> mpeg2video -aspect 4:3 -y out.mpv
>

I run into a similar problem that was solved by using
pnmtopnm (part of the Netpbm tools) in front of ffmpeg.

Could you please attempt to use:

convert -size 160x128 -depth 8 xc:white white.ppm
i=0
while [ $((i<10000)) == 1 ]
do
  let i=$((i+1))
  cat white.ppm
done | \
pnmtopnm | \
ffmpeg -f image2pipe -vcodec ppm -i - \
  -s 160x128 -r 25 -b 90 -f mpeg2video -aspect 4:3 -y out.mpv


Regards,
V?ctor Paesa