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#327 MP4Box DASH generation with H.265 Content Conformance Issues
open
nobody
5
2015-02-17
2014-08-20
No
Dear all,
I have generated DASH content with MP4Box based on H.265 video (x265 in FFmpeg).
MP4Box - GPAC version 0.5.1-DEV-rev5322 is being used, running on Windows 7 32 bits.
The conformance test of the video representations obtained gave the following issues:
Section 6.3.4.3. of ISO/IEC 23009-1:2012(E): If 'sidx' is present in a Media Segment, the first 'sidx' box shall document the entire Segment. Violated for Media Segment 1. Segment duration 596.333333, Sidx documents 597.208333 for track 1, diff 0.875000.
Referenced moof earliest_presentation_time 10.291667 does not match to reference EPT 10.416667 for sidx number 1 at reference count 1.
SAP found with presentation time 12.000000 lesser than the declared SAP time 12.125000 (SAP_delta_time 0.000000), for sidx number 1 at reference count 2; first SAP shall be signalled as per Section 8.16.3.3 of ISO/IEC 14496-12 4th edition.
starts_with_SAP declared but the first sample's composition time does not match, for sidx number 1 at reference count 2 (checking sample 1 of trun 1, traf 1, moof 3).
Referenced track duration 10.291667 of track 1 does not match to subsegment_duration 10.416667 for leaf with EPT 0.000000, difference 1.250000e-001, threshold 8.138021e-005 (Leaf count 1).
The command used was:
MP4Box -dash 5000 -profile onDemand -rap -frag-rap -url-template -out
C:\xampp\htdocs\Dashcontent\BBB_H265\BBB_OnDemand_H265.mpd -segment-name %s_ -segment-ext mp4
~\ContentSources\bbb_720p_2000k_H265.mp4 ~\ContentSources\bbb_720p_1000k_H265.mp4
~\ContentSources\bbb_audio_32k.mp4
I would appreciate your comments related to this issue.
Thanks in advance!
Kind regards,
Diego Suarez
Related
Hi Diego,
We are aware of this and plan to investigate when we find time. However you'll notice these are just warnings about imprecise timings and should not prevent your content to play.
Just for my knowledge, have you run the conformance checker on an equivalent stream with x264?
Romain
Hi Roman,
Yes. Using the same content but encoding it with H.264 gives no conformance issues.
Kind regards,
Diego
Dear Roman,
I hope everything is fine by your side.
We would like to report you some conformance issues that we have DASHing
HEVC in Live profile.
Software Versions (updated on 17/02/2015):
GPAC version 0.5.2-DEV-rev75-g7c128ee-master
ffmpeg version N-69861-g2bae7b3
Platform:
Windows 7 32 bits.
Commands for Representation Generation:
//BBB HEVC 720 @ 1000K
ffmpeg -t 16 -i ~\ContentSources\bbb_720p_H265_TS.ts -f mp4 -vcodec
libx265 -s 1280x720 -aspect 16:9 -b:v 1000k -an -maxrate 1008k -bufsize
2008k -threads 0 -x265-params
no-open-gop=1:min-keyint=96:scenecut=0:keyint=96 -y
~\ContentSources\bbb_720p_1000k_H265_16Secs_265params.mp4
//BBB HEVC 720 @ 2000K
ffmpeg -t 16 -i ~\ContentSources\bbb_720p_H265_TS.ts -f mp4 -vcodec libx265
-s 1280x720 -aspect 16:9 -b:v 2000k -an -maxrate 2016k -bufsize 4008k
-threads 0 -x265-params no-open-gop=1:min-keyint=96:scenecut=0:keyint=96 -y
~\ContentSources\bbb_720p_2000k_H265_16Secs_265params.mp4
//BBB HEVC 720 @ 4000K
ffmpeg -t 16 -i ~\ContentSources\bbb_720p_H265_TS.ts -f mp4 -vcodec
libx265 -s 1280x720 -aspect 16:9 -b:v 4000k -an -maxrate 4032k -bufsize
8032k -threads 0 -x265-params
no-open-gop=1:min-keyint=96:scenecut=0:keyint=96 -y
~\ContentSources\bbb_720p_4000k_H265_16Secs_265params.mp4
//AUDIO Rep:
ffmpeg -i ~\ContentSources\bbb_720p_H265_TS.ts -t 16 -vn -b:a 32k -ar 48000
-ac 2 -acodec libvo_aacenc -profile:a aac_he_v2 -threads 0 -y
~\ContentSources\bbb_32k_16Secs_audio.mp4
Commands for DASHing:
//DASH Live:
MP4Box -dash 4000 -profile live -rap -frag-rap -url-template -out
~\Dashcontent\BBB_H265_16Secs_FFMPEG_265params_Live\BBB_Live_H265_265params.mpd
-segment-name %s_ -segment-ext mp4
~\ContentSources\bbb_720p_1000k_H265_16Secs_265params.mp4
~\ContentSources\bbb_720p_2000k_H265_16Secs_265params.mp4
~\ContentSources\bbb_720p_4000k_H265_16Secs_265params.mp4
~\ContentSources\bbb_32k_16Secs_audio.mp4
Conformance Issues:
Please find it in the attached file.
Content used:
https://app.box.com/s/7fy5cnyntsjhdxzqh95ceoybu7xm1z94
DASHed files (MPD and segments):
https://app.box.com/s/rlvm3wo4e4ceqx918924rcq20duuiyok
I appreciate your help checking this issue.
Kind regards,
Diego
On Wed, Aug 20, 2014 at 6:41 PM, Diego Andres Suarez diegosuarez@users.sf.net wrote:
Related
Bugs: #327
The input file seem to contain open-GOPs:
I sent you a PM. I can't see any attachment to the previous message.