How to make avi (MJPEG codec) by avconv for iphone?

Question

I try to make video from pack of jpg by avconv and open it on iphone. I make avi file using MJPEG by command:

avconv -r 10 -i %06d.jpg -r 10 -vcodec mjpeg -qscale 1 out.avi

Eveything is ok on my PC, but when I open this video on iphone I see only black screen. I try to "convert"(by AVS Video Converter) it from MJPEG to MJPEG using all parametrs like in input file and iphone play it normally. I don't understand why video before "converting" is not playing on iphone. What I doing wrong?

PS info from avconv:

before "converting"

/mnt/dav $ avconv -i out.avi
avconv version 0.8.6-6:0.8.6-1+rpi1, Copyright (c) 2000-2013 the Libav developers
  built on Mar 31 2013 13:58:10 with gcc 4.6.3
Input #0, avi, from 'out.avi':
  Metadata:
    encoder         : Lavf53.21.1
  Duration: 00:00:02.30, start: 0.000000, bitrate: 3767 kb/s
    Stream #0.0: Video: mjpeg, yuvj422p, 1280x720, PAR 1:1 DAR 16:9, 10 tbr, 10 tbn, 10 tbc
At least one output file must be specified

after "converting"

/mnt/dav $ avconv -i out_conv.avi
avconv version 0.8.6-6:0.8.6-1+rpi1, Copyright (c) 2000-2013 the Libav developers
  built on Mar 31 2013 13:58:10 with gcc 4.6.3
Input #0, avi, from 'out_conv.avi':
  Duration: 00:00:02.30, start: 0.000000, bitrate: 3804 kb/s
    Stream #0.0: Video: mjpeg, yuvj420p, 1280x720, 10 tbr, 10 tbn, 10 tbc
At least one output file must be specified

score 0 · Accepted Answer · answered Mar 02 '14 at 10:22

The problem seems to be that the video has yuvj422p as pixel format, which uses 4:2:2 chroma subsampling. It could be that the iPhone only supports 4:2:0 subsampling.

Try this instead:

avconv -r 10 -i %06d.jpg -r 10 -vcodec mjpeg -pix_fmt yuvj420p -qscale 1 out.avi

How to make avi (MJPEG codec) by avconv for iphone?

1 Answers1