Question about mkv and avi muxing

[张若]

I am using gstreamer 1.0 on imx 6 board with kernel 3.14 to do some video colorspace conversions. However, playback of the output video has some problems.

The input video is YUYV (YUY2) format with AVI. What I did is to convert it to I420 format with MKV/AVI.

To MKV:

gst-launch-1.0 -v -e filesrc location=output_clip2.avi ! avidemux ! videoparse height=1080 width=1920 framerate=50/1 format=GST_VIDEO_FORMAT_YUY2 ! videoconvert ! video/x-raw, format=I420, height=1080, width=1920, framerate=50/1  ! matroskamux ! filesink location=/mnt/sdcard/testconv.mkv

To AVI:

gst-launch-1.0 -v -e filesrc location=output_clip2.avi ! avidemux ! videoparse height=1080 width=1920 framerate=50/1 format=GST_VIDEO_FORMAT_YUY2 ! videoconvert ! video/x-raw, format=I420, height=1080, width=1920, framerate=50/1  ! avimux ! filesink location=/mnt/sdcard/testconv.avi

Above, I only use SW (videoconvert) for conversion. I also try to convert from YUYV to UYVY first by SW and from UYVY to I420 by HW (imxipuvideotransform) to reduce the CPU usage.

For both of them, running process is fine and I can get the mkv and avi files. The problems are with playback of them. For MKV output, I cannot play the video using VLC, it shows"cannot recognize and find the codec", but it is successful to play with the Potplayer. For AVI output, both VLC and Potplayer cannot play the video.

In addition, I also try streaming without any conversion:

gst-launch-1.0 -v -e filesrc location=output_clip2.avi ! avidemux ! matroskamux ! filesink location=/mnt/sdcard/testconv.mkv

The same problem with the output MKV file.

I don't know why this happens. Maybe I did something wrong? I am not sure and ask for help.

Thanks in advance!

Ruo

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

[Sebastian Dröge-3]

On Mo, 2016-09-12 at 13:52 +0200, 张若 wrote:
> 
> For both of them, running process is fine and I can get the mkv and
> avi files. The problems are with playback of them. For MKV output, I
> cannot play the video using VLC, it shows"cannot recognize and find
> the codec", but it is successful to play with the Potplayer. For AVI
> output, both VLC and Potplayer cannot play the video.

Most likely that just means that they don't support raw video in AVI
and/or MKV, or have their own custom signalling for that which we don't
implement. You would have to research what those players support, and
then possibly add support for that to GStreamer if there is anything
you could use.

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel