Mailing List Archive

#11283: heavy network load when viewing large (> 1Gbyte) MP4 video
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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
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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>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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