#3399: Scaling MP4 Video results in bad output MP4
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Reporter: mressler | Type: defect
Status: new | Priority: normal
Component: undetermined | Version: 2.1.3
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
Attempting to scale an MP4/H264 1920x1080 source video to 1024:-1 (also
Mp4/H264) results in odd playback in different players. VLC shows green
box artifacts, QuickTime and MPlayer both show jerky/slow playback.
How to reproduce:
(Grab source from:
https://www.dropbox.com/s/thy8zxbvx1ygqru/VID_20130619_161750_449.mp4)
{{{
% ffmpeg -i VID_20130619_161750_449.mp4 -vf "scale=1024:-1" VID_scaled.mp4
}}}
VID_scaled.mp4 ends up with green artifacts in VLC and doesn't play
appropriately in QuickTime or MPlayer.
Interestingly, if I clip the video first via:
{{{
% ffmpeg -i VID_20130619_161750_449.mp4 -ss 18 -t 15 -c:v copy -c:a copy
clip2.mp4
}}}
And then run the scale command:
{{{
% ffmpeg -i clip2.mp4 -vf "scale=1024:-1" VID_clip_scaled.mp4
}}}
The resulting video plays fine in VLC, QuickTime, and MPlayer.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3399>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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