[Cin] HDV manual section need some work

[Andrew Randrianasulu]

чт, 3 нояб. 2022 г., 03:14 Andrew Randrianasulu <randrianasulu at gmail.com>:

> I think we can add some clarification
>
> ---
> HDV on a Blu-ray Disc Without Re-encoding
>
> An MTS file is a video file saved in the high-definition (HD) MPEG
> Transport Stream video format, commonly called AVCHD. It contains HD video
> compatible with Blu-ray disc format and is based on the MPEG-2 transport
> stream. MTS files are often used by Sony, Panasonic, Canon and other HD
> camcorders. Legal input for Video – MPEG1VIDEO, MPEG2VIDEO, H264; Audio –
> MP1, MP2, AC3, AC3PLUS, DTS, TRUHD.
>
> Note, mp2 and mp1 audio codecs are valid for transport stream itself but
> not as on-disk format for Blu-Rays.
>
> In this case you still can save original video by using ffmpeg's switches
>
>  -c:v copy -c:a ac3 , while outputting into another temporal ts container.
>
> {waiting for Terje's results on pcm_bluray case}
>
>
> ---
>
>
> I think all m2ts files you used for testing were h264/aac (or ac3), not
> from-camcoder HDVs with mpeg2 video/mp2 audio.
>
> you can try HDV-in-mov from this folder as ffmpeg test file, I think
>
> http://samples.mplayerhq.hu/mov/FCP/
>

oh, this is not mp2 audio but pcm audio. And ..not exactly kind of pcm used
on blurays!

so this line work, note mpegts_m2ts_mode switch for enabling more bluray
like output, without it ffmpeg will mux audio into private stream -  good
luck getting it back!

ffmpeg -i  HDV_1080i50.mov -c:v copy -c:a pcm_bluray  -mpegts_m2ts_mode 1
hdv.mts

then tsmuxer recognizes mts file as below:

~/tsMuxer $ tsmuxer hdv.mts
tsMuxeR version 2.6.16-dev. github.com/justdan96/tsMuxer
Track ID:    4113
 Stream type: MPEG-2
Stream ID:   V_MPEG-2
Stream info: Profile: Main at 6. Resolution: 1440:1080i. Frame rate: 25
Stream lang:

Track ID:    4352
Stream type: LPCM
Stream ID:   A_LPCM
Stream info: Bitrate: 1536Kbps  Sample Rate: 48KHz  Channels: 2  Bits per
sample: 16bit
Stream lang: eng

Duration: 00:00:08.000

====

I wonder if you can cp this file few times and then cat them back together
for simulating longer video ) ?





>
> ----
>
> For creating a blu-ray disc, if you have HDV MPEG-2 media that is in
> blu-ray format, you can save the original quality of your work, rather than
> rendering it to another format.
>
>
> {I hope Terje will let us know if bdwrite still works with bluray pcm
> audio as produced by ffmpeg 5.1+}
>
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