[gstreamer-bugs] [Bug 570144] [ffdec] decodes unlinked streams

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-ffmpeg | Ver: git




------- Comment #5 from LRN  2009-03-05 11:51 UTC -------
Created an attachment (id=130121)
 --> (http://bugzilla.gnome.org/attachment.cgi?id=130121&action=view)
Log of reading ogg file with theora-encoded video

from gstffmpegdec.c, line 700+:

  if (ffmpegdec->direct_rendering) {
    GST_DEBUG_OBJECT (ffmpegdec, "trying to enable direct rendering");
    if (oclass->in_plugin->capabilities & CODEC_CAP_DR1) {
      if (oclass->in_plugin->id == CODEC_ID_H264) {
        GST_DEBUG_OBJECT (ffmpegdec, "disable direct rendering setup for
H264");
        /* does not work, many stuff reads outside of the planes */
        ffmpegdec->current_dr = FALSE;
        ffmpegdec->extra_ref = TRUE;
      } else {
        GST_DEBUG_OBJECT (ffmpegdec, "enabled direct rendering");
        ffmpegdec->current_dr = TRUE;
      }
    } else {
      GST_DEBUG_OBJECT (ffmpegdec, "direct rendering not supported");
    }
  }

This is just the case: i'm reading mp4 with H.264 video and AAC audio. So, this
seems to be a coincidence: to test whether uridecodebin decodes unplugged
streams or not (i had such doubts from the very beginning, since at some point
i thought about decoding streams one-by-one, not simultaneously) i've got a
media file that would expose that for sure - 1 hour long recording of a
concert, encoded in high-profile H.264. I thought that decoding high-profile
H.264 video would burden my CPU significantly and will take much time, so it
would be obvious that video stream is indeed being decoded. But judging by
ffmpegdec source direct-rendering is always disabled for H.264, so this
testcase is inappropriate.

OK, i've tried theora-encoded video file with vorbis audio (ogg container).
Same thing - video is being decoded. Attaching a log file.

Since you've pointed me at buffering issue, i've tried to read the log myself.
It seems to me that theoradec happily goes all the way down to
theora_handle_data_packet(), calls theora_decode_packetin() to decode data and
then suddenly realizes that there's no buffer because pad is not linked.


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