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#1  July 18, 2013 - 7:09am
zzpiggy's picture
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A little problem which is getting me confuse......

 

When play MP4 files with chapters and embedded subtitles, if I jump between chapters, subtitle words supposed to be shown at the very beginning of chapters are missing, nothing shown up, but after several seconds the subtitle works again.

 

For example, some MP4 files I have are music concerts, all with chapters and embedded subtitles. Each chapter is a song, at the beginning of these chapters subtitle should show the song name, and then lyrics following. If I jump between chapters, song names are always missing, just lyrics, cos song names at the very beginnings of chapter, say one second or two from chapter start. If I don't jump then song names are ok, displayed perfect.   

  July 19, 2013 - 4:21pm
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Do you know what type of embedded subtitles your video has?

If you're able to run one of the videos through MediaInfo and PM me the specs it may help track down what's going on.

http://sourceforge.net/projects/mediainfo/

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  July 20, 2013 - 4:28am
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Thank you for replying!

 

Those subtitles are .srt files originally, in UTF-8 encoding. I use handbrake/vidcoder to mix them into MP4. 

 

Like this one:

General
Complete name                  : E:\avTemp\Adele.Live.at.the.Royal.Albert.Hall.2011.BluRay.640p.AAC.x264.mp4
Format                         : MPEG-4
Format profile                 : Base Media / Version 2
Codec ID                       : mp42
File size                      : 1.94 GiB
Duration                       : 1h 39mn
Overall bit rate mode          : Variable
Overall bit rate               : 2 791 Kbps
Movie name                     : Live at the Royal Albert Hall
Performer                      : Adele
Recorded date                  : 2011
Encoded date                   : UTC 2013-07-17 13:54:48
Tagged date                    : UTC 2013-07-17 14:54:16
Cover                          : Yes
hdvd                           : 1
stik                           : 9

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : High@L4.1
Format settings, CABAC         : Yes
Format settings, ReFrames      : 4 frames
Codec ID                       : avc1
Codec ID/Info                  : Advanced Video Coding
Duration                       : 1h 39mn
Bit rate mode                  : Variable
Bit rate                       : 2 560 Kbps
Width                          : 1 136 pixels
Height                         : 480 pixels
Display aspect ratio           : 2.35:1
Original display aspect ratio  : 2.35:1
Frame rate mode                : Constant
Frame rate                     : 29.970 fps
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Bits/(Pixel*Frame)             : 0.157
Stream size                    : 1.78 GiB (92%)
Writing library                : x264 core 133 r2334 a3ac64b
Encoding settings              : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=300 / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=2560 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=62500 / vbv_bufsize=78125 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Encoded date                   : UTC 2013-07-17 13:54:48
Tagged date                    : UTC 2013-07-17 14:51:18
Color primaries                : BT.709
Transfer characteristics       : BT.709
Matrix coefficients            : BT.709

Audio
ID                             : 2
Format                         : AAC
Format/Info                    : Advanced Audio Codec
Format profile                 : LC
Codec ID                       : 40
Duration                       : 1h 39mn
Bit rate mode                  : Variable
Bit rate                       : 224 Kbps
Maximum bit rate               : 256 Kbps
Channel(s)                     : 2 channels
Channel positions              : Front: L R
Sampling rate                  : 48.0 KHz
Compression mode               : Lossy
Delay relative to video        : 67ms
Stream size                    : 159 MiB (8%)
Language                       : English
Encoded date                   : UTC 2013-07-17 13:54:48
Tagged date                    : UTC 2013-07-17 14:51:17

Text
ID                             : 3
Format                         : Timed Text
Muxing mode                    : sbtl
Codec ID                       : tx3g
Duration                       : 1h 38mn
Bit rate mode                  : Variable
Bit rate                       : 61 bps
Delay relative to video        : 67ms
Stream size                    : 43.8 KiB (0%)
Language                       : English
Encoded date                   : UTC 2013-07-17 13:54:48
Tagged date                    : UTC 2013-07-17 14:51:17

Menu
ID                             : 5
Codec ID                       : text
Duration                       : 1h 39mn
Encoded date                   : UTC 2013-07-17 14:54:16
Tagged date                    : UTC 2013-07-17 14:54:16
Bit rate mode                  : VBR

  July 22, 2013 - 11:08am
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Thanks. We'l see if we can replicate the issue here with a similar file.

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