[Cin] HDV is really 4 channel?

[Andrew Randrianasulu]

ср, 17 янв. 2024 г., 03:31 Terje J. Hanssen <terjejhanssen at gmail.com>:

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> Den 16.01.2024 21:30, skrev Terje J. Hanssen:
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> Den 16.01.2024 20:23, skrev Andrew Randrianasulu:
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> https://trac.ffmpeg.org/ticket/1258
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> see attached to this ticket  modded decoder ...
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> I wonder if Terje's audio really 4ch? if so,may be we can decode it to 4*
> wav first, then encode them correctly to bluray lpcm / dvd pcm / ac3 ...
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> I did leave out some "empty channels" to simplify and clean up the post.
> Here are the full ffprobe output for the HDV source (mediainfo was
> complete):
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> ffprobe -hide_banner hdv07_05.m2t
> [mpeg2video @ 0x55d58a968340] Invalid frame dimensions 0x0.
>     Last message repeated 7 times
> [mpegts @ 0x55d58a93e580] Could not find codec parameters for stream 2
> (Unknown: none ([160][0][0][0] / 0x00A0)): unknown codec
> Consider increasing the value for the 'analyzeduration' (0) and
> 'probesize' (5000000) options
> [mpegts @ 0x55d58a93e580] Could not find codec parameters for stream 3
> (Unknown: none ([161][0][0][0] / 0x00A1)): unknown codec
> Consider increasing the value for the 'analyzeduration' (0) and
> 'probesize' (5000000) options
> Input #0, mpegts, from 'hdv07_05.m2t':
>   Duration: 00:06:58.27, start: 3276.528000, bitrate: 25626 kb/s
>   Program 100
>   Stream #0:0[0x810]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 25000 kb/s, 25
> fps, 25 tbr, 90k tbn, 50 tbc
>     Side data:
>       cpb: bitrate max/min/avg: 25000000/0/0 buffer size: 7340032
> vbv_delay: N/A
>   Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
> stereo, fltp, 384 kb/s
>   Stream #0:2[0x815]: Unknown: none ([160][0][0][0] / 0x00A0)
>   Stream #0:3[0x811]: Unknown: none ([161][0][0][0] / 0x00A1)
> Unsupported codec with id 0 for input stream 2
> Unsupported codec with id 0 for input stream 3
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> I fogot to add that loading the HDV clip in CinGG, there is only two
> visible streams:
> #1 (video) and #2 (stereo Audio)
> (That is, nothing similar to loading .mov file, where there were
> additional 6 empty audio streams, #3 - #8)
>

yeah, no support in ffmpeg, no support in libsndfile (I filed feature
request) -> no additional channels!

you need to compile decoder from source, then use it on ffmpeg-extracted
mp2 file so it will generate 4 wav files.





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