Invalid pixel aspect ratio in ffmpeg

Question

I want to scale a video to a certain size using ffmpeg, but I get the following error:

ffmpeg -i Ad_939.avi -vf scale=1000:64 test_ad.avi       
ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep 26 2014 10:31:06 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: 
  libavutil      52. 92.100 / 52. 92.100
  libavcodec     55. 69.100 / 55. 69.100
  libavformat    55. 48.100 / 55. 48.100
  libavdevice    55. 13.102 / 55. 13.102
  libavfilter     4. 11.100 /  4. 11.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
Input #0, avi, from 'Ad_939.avi':
  Metadata:
    encoder         : Lavf56.4.101
  Duration: 00:00:20.50, start: 0.000000, bitrate: 75 kb/s
    Stream #0:0: Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 160x64, 68 kb/s, SAR 32:45 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc
[mpeg4 @ 0x2305cc0] Invalid pixel aspect ratio 128/1125, limit is 255/255 reducing
[mpeg4 @ 0x2305cc0] too many threads/slices (5), reducing to 4
Output #0, avi, to 'test_ad.avi':
  Metadata:
    ISFT            : Lavf55.48.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1000x64 [SAR 19:167 DAR 2375:1336], q=2-31, 200 kb/s, SAR 128:1125 DAR 16:9, 24 fps, 24 tbn, 24 tbc
    Metadata:
      encoder         : Lavc55.69.100 mpeg4
Stream mapping:
  Stream #0:0 -> #0:0 (wmv2 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
frame=  228 fps=0.0 q=2.0 size=     222kB time=00:00:09.50 bitrate= 191.6kbits/s
frame=  468 fps=467 q=2.0 size=     435kB time=00:00:19.50 bitrate= 182.8kbits/s
frame=  492 fps=456 q=2.0 Lsize=     458kB time=00:00:20.50 bitrate= 183.1kbits/s    
video:441kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.981523%

I've read around and it seems this was a past bug but that was 3 years ago. I've tried running this command with version 2.4.1, 2.3.3, 2.4.git (compiled from source Sept 16, 2014), and N-40951-g1ea7a3e (Newest static build) and they all fail.

EDIT: When I say fail I mean that the video is not playing at the proper resolution. The file's properties say that it is 1000x64 but VLC plays (as well as my website using a <video> tag) it with the original aspect ratio with the new width which is not what I want. I want a crunched up video the same size no matter what.

Is there something I'm missing?

dudeofea dudeofea · Accepted Answer · 2014-09-26T17:24:30

Seems I had the same problem as this fellow in the ffmpeg bug tracker.

So instead using

ffmpeg -i Ad_939.avi -vf scale=1000:64,setdar=1000/64 test_ad.avi

still gave the same pixel aspect ratio warning but was instead:

[mpeg4 @ 0x2004cc0] Invalid pixel aspect ratio 624/625, limit is 255/255 reducing

which is close enough for me. 0.9984 is basically 1.0

Invalid pixel aspect ratio in ffmpeg

1 Answers