Thanks for the feedback and comments.
Den 30.06.2025 01:00, skrev BloodMan:
Hi,
W dniu 2025-06-29 o 23:29, Terje J. Hanssen pisze:
a) Why so when the standard .M2T is 25 Mbps?
Because of:
> Stream mapping:
> Stream #0:2 -> #0:0 (mpeg2video (native) -> mpeg1video (native))
^ ^
Caused by:
> ffmpeg -hide_banner -f iec61883 -i auto -dvbuffer 100000 out.mpg
^^^
(yeah, do not use .mpg without codec tweaking, IMHO do not use at all ;)
Seemingly the most important missing part of the documentation's example
code line
ffmpeg -f iec61883 -i auto -dvbuffer 100000 out.mpg
is "-c copy"
HDV 1080i50 stream is MPEG-2/ MP@H-14 video and MP2 audio
The container can be .mpg or .m2t
I have tried additional combination as follows:
.mpg w/o "-c copy" ==> mpeg1video, mp2 audio
.mpg with "-c copy" ==> mpeg2video, mp2 audio
.mp4 w/o "-c copy" ==> h264 video, aac audio
.mp4 with "-c copy" ==> mpeg2video, mp2 audio
-----------
In addition I created a "BDAV" format using hdv video copy and mp2 audio
to pcm_bluray transcoding.
ffmpeg -hide_banner -f iec61883 -i auto -c:v copy -c:a pcm_bluray
-mpegts_m2ts_mode 1 -t 30 Out_hdv.m2ts
[mpeg2video @ 0x556b164f54c0] Invalid frame dimensions 0x0.
Last message repeated 4 times
[iec61883 @ 0x556b164d6a40] Could not find codec parameters for stream 0
(Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and
'probesize' (5000000) options
[iec61883 @ 0x556b164d6a40] Could not find codec parameters for stream 3
(Unknown: none ([160][0][0][0] / 0x00A0)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and
'probesize' (5000000) options
[iec61883 @ 0x556b164d6a40] Could not find codec parameters for stream 4
(Unknown: none ([161][0][0][0] / 0x00A1)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and
'probesize' (5000000) options
Input #0, iec61883, from 'auto':
Duration: N/A, start: 1796.421533, bitrate: 25384 kb/s
Program 100
Stream #0:2: 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
Side data:
cpb: bitrate max/min/avg: 25000000/0/0 buffer size: 7340032
vbv_delay: N/A
Stream #0:1: Audio: mp2 (mp3float) ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, fltp, 384 kb/s
Stream #0:3: Unknown: none ([160][0][0][0] / 0x00A0)
Stream #0:4: Unknown: none ([161][0][0][0] / 0x00A1)
No Program
Stream #0:0: Unknown: none
Stream mapping:
Stream #0:2 -> #0:0 (copy)
Stream #0:1 -> #0:1 (mp2 (native) -> pcm_bluray (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to 'Out_hdv.m2ts':
Metadata:
encoder : Lavf61.7.100
Stream #0:0: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], q=2-31,
25000 kb/s, 25 fps, 25 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 25000000/0/0 buffer size: 7340032
vbv_delay: N/A
Stream #0:1: Audio: pcm_bluray, 48000 Hz, stereo, s16, 128 kb/s
Metadata:
encoder : Lavc61.19.101 pcm_bluray
[out#0/mpegts @ 0x556b16516b40] video:90364KiB audio:5648KiB
subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead:
5.467366%
frame= 740 fps= 26 q=-1.0 Lsize= 101262KiB time=00:00:30.00
bitrate=27651.3kbits/s speed=1.06x
b) There are also warnings regarding streams 0, 3, 4 ?
Program/technical/cam-internal data
(maybe text, geo, title, etc data, ignore in general)
a) Adding "-c copy" solves the output bitrate = input bitrate = 25 Mbps
Yup, copy or mp4 codec it's probably best way...
c) Trying to increase the value for the 'analyzeduration' (0) and
'probesize' are not successful?
no success because the streams do not contain recognizable data
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