[mythtv-commits] Ticket #11283: heavy network load when viewing large (> 1Gbyte) MP4 video

[MythTV]

#11283: heavy network load when viewing large (> 1Gbyte) MP4 video
----------------------+-----------------------------------------
 Reporter:  willem@…  |           Type:  Bug Report - General
   Status:  new       |       Priority:  minor
Milestone:  unknown   |      Component:  MythTV - Video Playback
  Version:  0.25.3    |       Severity:  medium
 Keywords:            |  Ticket locked:  0
----------------------+-----------------------------------------
 When watching a MP4 video with mythfrontend running on a different system
 than mythbackend, I observe heavy network traffic and a stuttering
 display. My network is 100Mbit, and it is completely loaded: ca. 10
 Mbyte/second down, ca. 200kByte/sec up.

 This does not happen when the video is smaller than 1 Gbyte. In fact, I
 have a video in two parts, each of which is less than 1 Gbyte and plays
 fine. When I combine the parts with
   mencoder part1.avi part2.avi -oac copy -ovc copy -o total.avi
 viewing the resulting file (total.avi) results in the heavy network load.

 The characteristics of the video:
 {{{
 ID_VIDEO_ID=0
 ID_AUDIO_ID=1
 ID_CLIP_INFO_NAME0=Software
 ID_CLIP_INFO_VALUE0=MEncoder\ svn\ r34540\ \(Ubuntu\),\ built\ with\
 gcc-4.6
 ID_CLIP_INFO_N=1
 ID_FILENAME=total.avi
 ID_DEMUXER=avi
 ID_VIDEO_FORMAT=FMP4
 ID_VIDEO_BITRATE=1816640
 ID_VIDEO_WIDTH=704
 ID_VIDEO_HEIGHT=386
 ID_VIDEO_FPS=25.000
 ID_VIDEO_ASPECT=0.0000
 ID_AUDIO_FORMAT=85
 ID_AUDIO_BITRATE=126136
 ID_AUDIO_RATE=0
 ID_AUDIO_NCH=0
 ID_START_TIME=0.00
 ID_LENGTH=8379.68
 ID_SEEKABLE=1
 ID_CHAPTERS=0
 ID_VIDEO_CODEC=ffodivx
 ID_AUDIO_BITRATE=126136
 ID_AUDIO_RATE=48000
 ID_AUDIO_NCH=2
 ID_AUDIO_CODEC=ffmp3float
 ID_EXIT=EOF
 }}}

 I have to add that the effect present for all video's larger than 1Gbyte,
 for example the video with the following characteristics gives the same
 problem:
 {{{
 ID_VIDEO_ID=0
 ID_AUDIO_ID=1
 ID_CLIP_INFO_NAME0=Software
 ID_CLIP_INFO_VALUE0=MEncoder\ svn\ r34540\ \(Ubuntu\),\ built\ with\
 gcc-4.6
 ID_CLIP_INFO_N=1
 ID_FILENAME=test2.avi
 ID_DEMUXER=avi
 ID_VIDEO_FORMAT=MP42
 ID_VIDEO_BITRATE=3077192
 ID_VIDEO_WIDTH=1024
 ID_VIDEO_HEIGHT=416
 ID_VIDEO_FPS=25.000
 ID_VIDEO_ASPECT=0.0000
 ID_AUDIO_FORMAT=85
 ID_AUDIO_BITRATE=213920
 ID_AUDIO_RATE=0
 ID_AUDIO_NCH=0
 ID_START_TIME=0.00
 ID_LENGTH=5084.20
 ID_SEEKABLE=1
 ID_CHAPTERS=0
 ID_VIDEO_CODEC=ffmp42
 ID_AUDIO_BITRATE=213920
 ID_AUDIO_RATE=48000
 ID_AUDIO_NCH=2
 ID_AUDIO_CODEC=ffmp3float
 ID_EXIT=EOF
 }}}

 Something to do with RIFF chunks at 1023 Mbyte?

 Regards,

 Willem Vermin

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/11283>
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