gst-launch works fine, but appsrc got Internal data flow error.

ByoungSoon Lee l22bss at
Wed Oct 31 23:02:28 PDT 2012

gst-launch works fine, but appsrc got Internal data flow error.
*Tim-Philipp Müller* t.i.m at
*Wed Oct 31 03:23:04 PDT 2012*


On Wed, 2012-10-31 at 16:55 +0900, ByoungSoon Lee wrote:


>* My first try is this and works fine.*>*   gst-launch filesrc location=test.avi ! decodebin2 !*>* ffmpegcolorspace ! autovideosink*>* *>* My second try also works fine, too. *>* The video_only.mpeg2 file is a video file without container*>* information, i.e., only included raw video data.*>*   gst-launch filesrc location=video_only.mpeg2 ! mpegvideoparse !*>* ffdec_mpeg2video ! ffmpegcolorspace ! autovideosink*>* *>* I have trouble when I run the code above using appsrc. I got  error*>* message : "Error Internal data flow error."*>* Does anybody can give me any suggestions or guide reference?*
Depending on the video sink actually chose, you might also need a
videoscale element between ffmpegcolorspace and autovideosink (for pixel
aspect ration adjustment, if the sink can't scale by itself).

If that's not it, perhaps make a GST_DEBUG log and have a look for where
it posts the error, and look at the lines before that to get an idea
what's going wrong.


Thanks. I tried what you suggested and it works fine.

I apply the same gst-launch pipeline in my i.mx6 (freescale) board, and it
also works beautiful
with a just little difference of the videoscale position.

gst-launch-0.10 filesrc location=video_only.mpeg2 ! mpegvideoparse
! ffdec_mpeg2video ! videoscale ! ffmpegcolorspace ! autovideosink

In the appsrc code, I need to change some.
First, remove pad-added signal connect part and second, directly link
mpegvideoparse and vpudec.

Now I have working pipeline using appsrc for raw video-only mpeg 2 file.


Here's the code snippet for the change.
 app->src = (GstAppSrc*)gst_element_factory_make("appsrc", "mysrc");
 app->decoder = gst_element_factory_make("mpegvideoparse", "mydecoder");
 app->ffmpeg = gst_element_factory_make("ffdec_mpeg2video", "myffmpeg");
 app->videoscale = gst_element_factory_make("videoscale", "myvideoscale");
 app->convertcolor = gst_element_factory_make("ffmpegcolorspace",
 app->videosink = gst_element_factory_make("autovideosink", "myvsink");


 g_signal_connect(app->src, "need-data", G_CALLBACK(start_feed), app);
 g_signal_connect(app->src, "enough-data", G_CALLBACK(stop_feed), app);
 //g_signal_connect(app->decoder, "pad-added",
 // G_CALLBACK(on_pad_added), app->ffmpeg);

 gst_bin_add_many(GST_BIN(app->pipeline), (GstElement*)app->src,
  app->decoder, app->ffmpeg, app->videoscale, app->convertcolor,
app->videosink, NULL);

 if(!gst_element_link((GstElement*)app->src, app->decoder)){
  g_warning("failed to link src anbd decoder");

 if(!gst_element_link(app->decoder, app->ffmpeg)){
  g_warning("failed to link decoder and ffmpeg");
  if(!gst_element_link(app->ffmpeg, app->videoscale)){
  g_warning("failed to link ffmpeg and videoscale");
 if(!gst_element_link(app->videoscale, app->convertcolor)){
  g_warning("failed to link videoscale and convertcolor");
 if(!gst_element_link(app->convertcolor, app->videosink)){
  g_warning("failed to link convertcolor and videosink");
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