[FFmpeg-user] Fw: Overlaying Teletext, getting jerky video

[JULIAN GARDNER]

Resending as i cannot see this in the mailing list




----- Forwarded Message -----
>From: JULIAN GARDNER <joolzg at btinternet.com>
>To: FFmpeg user questions <ffmpeg-user at ffmpeg.org> 
>Sent: Sunday, 15 December 2013, 15:29
>Subject: Re: [FFmpeg-user] Overlaying Teletext, getting jerky video
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>>________________________________
>> From: Nicolas George <george at nsup.org>
>>To: FFmpeg user questions <ffmpeg-user at ffmpeg.org> 
>>Sent: Sunday, 15 December 2013, 14:54
>>Subject: Re: [FFmpeg-user] Overlaying Teletext, getting jerky video
>> 
>>
>>Le quintidi 25 frimaire, an CCXXII, JULIAN GARDNER a écrit :
>>> Any
>>>  ideas on why frames are being dropped? I really think that there should
>>>  be the correct frames from the teletext engine to keep the overlay
>>> system running.
>>
>>There are a number of possible reasons; they mostly boil down to the
>>timestamps of the subtitles being out of sync. If you can not make the
>>source sample itself available, you can try to provide the following
>>information:
>>
>>* The first few video and teletext packets, as shown by ffprobe
>>  -show_packets.
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>>* The first few video and subtitles frames, as shown by ffprobe
>>  -show_frames.
>>
>>* The first few video and overlay frames inserted in the filter. For that,
>>  use the showinfo filter:
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>>  -filter_complex "[0:s] showinfo, scale=1280:720 [sub] ; [0:v] showinfo
>>  [vid] ; [vid][sub] overlay"
>>
>>Regards,
>>
>>-- 
>>  Nicolas George
>>
>>
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>Attached is the output with commandline
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>url to the file (240MB) 
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>http://joolzg.myetrayz.net:8080/rapidbox/rapidFileDownload.php?r_id=642e92efb79421734881b53e1e1b18b6
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>joolz
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>
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