[Kdenlive-devel] rendered DVD video - picture still "jerks" inDVD player

[Jan Uhlir]

I have to report partial success.
When I reencode video clip rendered in Kdenlive in Avidemux then jittering gone away when playing in standalone DVD player on TV.
Essential is to reencode video (DVD default options) AND SOUND  !! (libavcodec, ac3, 384 kbps) 
Not an ideal solution but at least some progress :)

So after all harryvanderwolf may be right about the sound cause. 
The question is what so bad is done to sound in Kdenlive renderer.



>Thank you harryvanderwolf for patience and help
>but still no success :(

>
>>
>>Hi Jan,
>>
>>This mail contains a lot of assumptions, I'm not sure here.
>>I start with something more about the audio options for DVD streams.
>>The standards are:
>>
>>    * PCM: 48 kHz or 96 kHz sampling rate, 16 bit or 24 bit L-PCM, 2 to
>>      6 channels, up to 6144 kbit/s
<http://en.wikipedia.org/wiki/Kbit/s>
>>    * AC-3: 48 kHz sampling rate, 1 to 5.1 (6) channels, up to 448
kbit/s
>>    * DTS: 48 kHz or 96 kHz sampling rate, 2 to 6.1 channels, Half Rate
>>      (768 kbit/s) or Full Rate (1536 kbit/s)
>>    * MP2: 48 kHz sampling rate, 1 to 7.1 channels, up to 912 kbit/s
>>
>>Most encoders I have worked with, both on linux and windows, use for AC3
>encoding a bitrate of 384 or (almost the default) 448 kbit/s and for mp2
>(mpeg) mostly 192 kbit/s.
>>I saw from the exports.profile file (in
>/usr/share/apps/kdenlive/profiles) that kdenlive uses AC3 encoding with
>"only" 192 kbit/s (which makes my answer not correct in my previous
mail).
>>You could try some custom option for export/render in kdenlive, or
modify
>the line in the exports.profile
>>:HQ:DVD:PAL:::avformat:PAL:vob:format=dvd aspect=4:3 vcodec=mpeg2video
>acodec=ac3 video_bit_rate=6500000 video_rc_max_rate=8000000
>video_rc_min_rate=0 video_rc_buffer_size=1835008 mux_packet_size=2048
>mux_rate=10080000 audio_bit_rate=192000 audio_sample_rate=48000
>frame_size=720x576 frame_rate=25 gop_size=15 me_range=63
>>
>>You could change the acodec=ac3 into acodec=mp3, leaving the
>audio_bit_rate=192000 as it is
>>or
>>leave the acodec=ac3 and change the audio bitrate to
>audio_bit_rate=448000
>>
>>A friend of mine, but also I myself once had dvd-players which had
>difficulties playing DVD's with other settings that the defaults, even
>though the DVD-standard itself allows them. Obviously the build-in
>decoding used to much processing power on these non-standard streams.
>Please try the default settings for Kdenlive.
>>
>>Kind regards,
>>Harry
>>
>>
>>
>>>   
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