This topic is treated with reference to the current Cinelerra-GG Manual
(and in the Features5 document at least since early 2018):
* 14.6 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 in-
put for Video – MPEG1VIDEO, MPEG2VIDEO, H264; Audio – MP1, MP2, AC3,
AC3PLUS, DTS, TRUHD.
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. Follow the steps below
directly instead of going through C INELERRA-GG. It has been tested
on 10 different MTS files.
du -sb /yourHDVfile.MTS # Determine the size of your file in bytes.
blocks=((size-in-bytes/2048 + 4096)) # Convert bytes into blocks
+ a little more.
mkudffs /tmp/newfilename.udfs blocks # Create a file with that #
of blocks + some extra.
mount -o loop /tmp/newfilename.udfs /mntX # Use a mount point
like mntX that is not in use.
/<cinelerra_installed_path>/bin/bdwrite /mntX /tmp/yourHDVfile.MTS
# Substitute cinelerra path.
umount /mntX # You must unmount the udfs filesystem
growisofs -Z /dev/bd=/tmp/newfilename.udfs # Replace /dev/bd
with your bluray hardware device.
OR dd if=/tmp/newfilename.udfs of=/dev/bd bs=2048000 # if using
rewritable blu-ray; replace bd.
===================
When the 1080i/25 HDV-source is recorded via i.Link (Firewire) to disk,
the file type and format is HDV.M2T
For this test I use the same, downloaded HDV file as previous mentioned
(not my file or camcorded by me!)
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
Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, s16p, 384 kb/s
The MPEG2 Video stream is Blu-ray compatible format, while the MP2 Audio
stream has to be converted to AC3.
Demux, convert the audio and remux to a M2TS stream using this ffmpeg
command:
ffmpeg -i 20081103140154.m2t -vcodec copy -acodec ac3 20081103140154.m2ts
............. skip
Input #0, mpegts, from '20081103140154.m2t':
Duration: 00:00:13.44, start: 1042.400000, bitrate: 26598 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
Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
stereo, s16p, 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)
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (mp2 (native) -> ac3 (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to '20081103140154.m2ts':
Metadata:
encoder : Lavf57.83.100
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, 90k tbc
Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
Metadata:
encoder : Lavc57.107.100 ac3
frame= 336 fps=0.0 q=-1.0 Lsize= 45549kB time=00:00:13.43
bitrate=27774.3kbits/s speed= 107x
video:41008kB audio:315kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 10.225909%
Comment
The default AC3 bitrate 192 kb/s here is halph of the source MP2 bitrate
384 kb/s. Any idea about the quality difference?
================
So further to trouble using the procedure steps from the Manual above:
Determine the size of the file in bytes.
du -sb 20081103140154.m2ts
46642368 20081103140154.m2ts
Try to calculate the blocks as
blocks=((/466423682048 + 4096)) = 26870.59375 ??
# mkudffs /tmp/bd_20201122_hdv_m2ts.udfs blocks 26870.59375
mkudffs: invalid block-count
Obviously something went wrong here.
Could someone test and verify these steps and further, to see if a
successful Blu-ray BDAV structure is created?
(Just now I have no Blu-ray burner in my working PC, so I have to wait
with burning the image to a BD-R/RE discs).
------------------
Terje J. H
One current and one previous related Blu-ray mail threads as references:
https://lists.cinelerra-gg.org/pipermail/cin/2020-November/002709.html
https://lists.cinelerra-cv.org/pipermail/cinelerra/2016q4/005609.html
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