https://bugzilla.gnome.org/show_bug.cgi?id=740368
GStreamer | don't know | 1.4.4
Summary: cannot change video track if tracks have different
width/height
Classification: Platform
Product: GStreamer
Version: 1.4.4
OS/Version: Linux
Status: UNCONFIRMED
Severity: minor
Priority: Normal
Component: don't know
AssignedTo: gstreamer-bugs at lists.freedesktop.org
ReportedBy: fvallee at connected-labs.com
QAContact: gstreamer-bugs at lists.freedesktop.org
GNOME version: ---
If a media has different video tracks, set the playbin "current-video" property
allow to select the current track displayed
g_object_set (playbin, "current-video", index, NULL);
This is working perfectly fine if the different tracks have the same
width/height.
However, if the width/height change, gstreamer will fail with the following
error
setting current video stream to 1
ERROR default video-frame.c:152:gst_video_frame_map_id: invalid
buffer size 540000 < 556800
ERROR mpeg2dec
gstmpeg2dec.c:563:gst_mpeg2dec_alloc_buffer:<mpeg2dec0> Failed to map frame
WARN multiqueue
gstmultiqueue.c:1571:gst_multi_queue_loop:<multiqueue0> error: Internal data
stream error.
WARN multiqueue
gstmultiqueue.c:1571:gst_multi_queue_loop:<multiqueue0> error: streaming
stopped, reason error
Error received from element multiqueue0: Internal data stream error.
( as reported using GST_DEBUG=*:3)
Please find attached a test application that can be used to reproduce the bug,
based on
http://docs.gstreamer.com/plugins/viewsource/viewpagesrc.action?pageId=327794
I've made the following changes:
1) update to be compatible with gst 1.0 (playbin2 -> playbin)
2) uri of media comes from command line
3) console prompt is used to select video (instead of text)
Hopefully the attached code can be compiled directly using cmake (cmake file
includes).
Steps to reproduce the issue:
1) test with a video containing 2 video tracks (same width / height):
./multitrack
http://trac.webkit.org/export/176315/trunk/LayoutTests/media/content/two-audio-and-video-tracks.mkv
--> press 0 or 1 in console allow to select the video track, it works perfectly
fine.
2) test with a video containing 3 video tracks with different w/h:
GST_DEBUG=*:3 ./multitrack file://$PWD/multivideo.mp4
gstreamer will fail when changing the video track.
multivideo.mp4 is included in attached code and has been generated using
ffmpeg:
ffmpeg -loop 1 -i image000.png -c:v libx264 -t 30 -pix_fmt yuv420p blue.mp4
ffmpeg -loop 1 -i image002.png -c:v libx264 -t 30 -pix_fmt yuv420p purple.mp4
ffmpeg -loop 1 -i image001.png -c:v libx264 -t 30 -pix_fmt yuv420p green.mp4
ffmpeg -i green.mp4 -i blue.mp4 -i purple.mp4 -map 0:0 -map 1:0 -map 2:0
-metadata:s:v:0 language=eng -metadata:s:v:1 language=fre -metadata:s:v:1
language=deu -c copy -c:v mpeg2video multivideo.mp4
(mplayer and SMPlayer are able to select multivideo.mp4 video tracks).
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