[Cin] video on LPCM DVD from DV method

[Andrew Randrianasulu]

On Sat, Jan 20, 2024 at 6:20 PM Terje J. Hanssen
<terjejhanssen at gmail.com> wrote:
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> Den 20.01.2024 15:22, skrev Andrew Randrianasulu:
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> сб, 20 янв. 2024 г., 17:08 Terje J. Hanssen <terjejhanssen at gmail.com>:
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>> Den 20.01.2024 13:44, skrev Andrew Randrianasulu:
>> > https://youtu.be/-NE2LZsVUjo
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>> > grand total of  two and half minutes at whooping 5 fps.
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>> Good to see it is possible "^"
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>> As LPCM is standard audio on DV video, and as released PAL DVD Videos
>> must contain at least one audio track using the PCM, MP2, or AC-3
>> format, and all standard PAL players must support all three of these
>> formats:
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>> What hinder "Create DVD" to render video + PCM audio from a DV file
>> simultaneous?
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> I guess because we use mplex and it demands separate audio and video (and subtitle if you do it) stream .... {if you search dvdstyler sf forums you will see ffmpeg  was not always consistent in exact dvd muxing}
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> I noticed a bit earlier there had been various problems with mplex

Like warnings? Yes, you most likely need to recalculate video/audio
bitrate  considering PCM takes quite a lot more space ...

I hope process can be made automatic as fast as we solve loudness problem ..


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> But let me ask another way:
> When I test simply and load a DV file in CinGG, then File > DVD Render, and check the defaults there and next Batch Render: <Start>
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> Now the DVD video and audio render simultaneous in one step.
> Inspecting the DVD structure's dvd.mpg it transcoded with AC3 audio.
> Why is transcoding to AC3 audio possible and not the "DV input's LPCM"?

because cinelerra's internal audio representation is double (64 bit)
float number? Also, in general you need to demultiplex audio from DV
stream.
Is this a problem in practice? If you really want you can just use
ffmpeg for this conversion, saving cinelerra-gg  for more  invasive
editing ...

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> Additional:
> Is Raw PCM the same as FFmpeg's dvd_pcm and is the latter available from the FFmpeg on CinGG's Create DVD?

Not yet, I think I have profile but it only works for 48khz/96 khz
samplerate, so you must be careful with loading 44.1Khz/32Khz sources
...



> (as known FFmpeg can encode and mux DVD with PCM to mpeg, while i.e DeVeDe additional can generate the iso)
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> I subscribed to mjpeg-users list and asked there about relative loudness of lpcm vs ac3 audio.
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