Re:Re: How to use the gst-launch to play unaligned raw video data files？

[dave]

hi Nicolas：


Thanks for your replay.
According to your suggestion, the problem is solved, thank you.




regrads,
Dave










At 2023-08-18 21:40:41, "Nicolas Dufresne via gstreamer-devel" <gstreamer-devel at lists.freedesktop.org> wrote:

Hi,


Le ven. 18 août 2023, 00 h 15, dave via gstreamer-devel <gstreamer-devel at lists.freedesktop.org> a écrit :


I have a 426x240 nv12 data file. I use the following command to play it, the resulting playback picture is distorted:

gst-launch-1.0 filesrc location=426x240-nv12-25fps-5s.yuv ! videoparse format=nv12 width=426 height=240 framerate=1/1 ! videoconvert ! autovideosink

I suspect that this problem is related to byte alignment. The width of the above file is 426, which is not 4-byte aligned; for some other 4-byte-aligned files, such as 428x240, 640x480, etc., using such commands can be played correctly:

gst-launch-1.0 filesrc location=428x240-nv12-25fps-5s.yuv ! videoparse format=nv12 width=428 height=240 framerate=1/1 ! videoconvert ! autovideosink

my question is :

1.Is my guess correct? (Non-4-byte alignment causes playback exception)

2.How to use the gst-launch to play such a video file?



Indeed, GStreamer default alignment is non zero. Though, rawvideoparse element have plane-offsets, plane-strides and frame-size property to work around this.


Nicolas




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