Subtitle delay issue when transcoding to PS3, ideas?

[zabby]

Hi,

I'm trying to transcode subtitled mkvs with VLC via Mediatomb to my PS3 (Ubuntu 9.10). After much frustration I managed to get it to *almost* work. The only issue now is the subtitles are around 30 seconds behind the audio and video. There seems to be a guy who had a similar problem here, but it was unresolved: viewtopic.php?f=4&t=53560&p=175272.

I tried using sub-delay as a hack fix, but if I push the subtitles any farther than 20 seconds back, they seem to disappear altogether, odd! The files play fine on VLC when not in streaming mode. Does anyone have any advice, or alternately, know of a way to reliably serve subtitled mkvs to a PS3 via Mediatomb? I tried mencoder but it seems to crash out on 30% of my movies with a codec error. Here's my code.

(streaming script)

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#!/bin/bash VLC_PATH="/usr/bin/vlc-wrapper" INPUT="$1" OUTPUT="$2" VIDEO_CODEC="mp2v" VIDEO_BITRATE="6000" VIDEO_FRAMERATE="25" AUDIO_CODEC="mpga" AUDIO_BITRATE="192" AUDIO_SAMPLERATE="48000" AUDIO_CHANNELS="2" FORMAT="ps" exec "${VLC_PATH}" "${INPUT}" -I dummy --sub-autodetect-fuzzy=1 --audio-language="ja" --sub-language="en" --sout="#transcode{vcodec=${VIDEO_CODEC},\ vb=${VIDEO_BITRATE},fps=${VIDEO_FRAMERATE},acodec=${AUDIO_CODEC},ab=${AUDIO_BITRATE},\ samplerate=${AUDIO_SAMPLERATE},channels=${AUDIO_CHANNELS},audio-sync,soverlay}:\ standard{access=file,mux=${FORMAT},dst=${OUTPUT}}" vlc://quit

as called from config.xml of Mediatomb

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<profile name="vlcprof" enabled="yes" type="external"> <mimetype>video/mpeg</mimetype> <accept-url>yes</accept-url> <first-resource>yes</first-resource> <hide-original-resource>yes</hide-original-resource> <accept-ogg-theora>yes</accept-ogg-theora> <agent command="/etc/mediatomb/mediatomb-video2mpeg" arguments="%in %out"/> <buffer size="10485760" chunk-size="262144" fill-size="524288"/> </profile>

[zabby]

bump

[Jean-Baptiste Kempf]

Probably the issue is because the fps is changing the subtitles timings....

[bt4262]

I'm also having this issue, as is someone else who posted here: viewtopic.php?f=4&t=75489

The video I'm trying to transcode has an FPS of 29.970 according to mkvinfo. I was using 25 FPS for transcoding, but using 30fps gives little improvement.

The first subtitle should appear around 00:10. When transcoding to 25 FPS, it appears around 1:40. Transcoding to 50 FPS puts it around 1:00. So, the timing looks like it might be off by a factor of 10. If the encoder would accept 300 FPS as an option, the subtitles might display correctly. Of course, changing the FPS really shouldn't affect how the subtitles display.

I'm not sure if this is related, but after the transcoding process runs for a while, it starts repeating this message:

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[0x2a82628] main subpicture error: subpicture heap full [0x2a82628] main subpicture error: subpicture heap full [0x2a82628] main subpicture error: subpicture heap full [0x2a82628] main subpicture error: subpicture heap full [0x2a82628] main subpicture error: subpicture heap full [0x2a82628] main subpicture error: subpicture heap full

The command I'm using:

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vlc -I dummy path/to/video.mkv --audio-language=ja,jn,jpn,Japanese,en,eng,English --sub-language=en,eng,English --sout='#transcode{vcodec=mp2v,vb=4096,fps=25,acodec=mp2a,ab=192,channels=2,deinterlace,audio-sync,soverlay}:standard{access=file,mux=ps,dst=test.mpg}' vlc://quit

Using VLC 1.0.6 on Ubuntu 10.04. Let me know if any other information would be of assistance.

[andrefre]

I'm having this issue with SOVERLAY too, when trying to transcode DVDs. The subtitle delay is all over the place, seemingly changing throughout the course of the transcoding. Thanks in advance for your help.

[vhs1998]

I am having the same issue as well. I think it does not relate to FPS changing during transcoding. The problem is that transcoding happens faster than real time movie playback and this breaks subtitles synchronization badly.

Any help from developers please?

I submitted a ticket for this issue:

http://trac.videolan.org/vlc/ticket/3891