[FFmpeg-user] compressed data with sdti
Dave Rice
daverice at mac.com
Wed Oct 3 22:15:21 CEST 2012
On Oct 3, 2012, at 4:01 PM, Roger Pack wrote:
>> I'm working with many betacam sx tapes (http://en.wikipedia.org/wiki/Betacam#Betacam_SX) and trying to determine if there is a process to copy video data as-is from the tape to a file without requiring transcoding or uncompressing the data (similar to dv tape over firewire). I can output the data over SDTI which is a protocol to send compressed video data in the usually visual area of an SDI stream. I tried capturing an SDTI output of a video deck to an SDI capture card to an uncompressed file. I see that the encoded data is stored in a single field of this resulting v210 codec so I hoped to take only that single field and parse out the compressed data (mpeg2 from the tape); however in the resulting data I see none of the usual identities of mpeg2 (gop headers, 0x0001b5, etc).
>
> Full command line and console output please?
I have to invent one since I'm not that familiar with the data encapsulated by SDTI in the resulting v210 data but I suppose to copy out the v210 but interpret it as mpeg2 I'd need a pipe like this; however, the compressed data within the v210 (from SDTI protocol is not as I expected and doesn't seem close to mpeg2, so this command is not expected to work).
dave
ffmpeg -i 732.avi -c:v copy -f rawvideo - | ffmpeg -c:v mpeg2video -i pipe:
ffmpeg version 0.11.1.gitffmpeg version 0.11.1.git Copyright (c) 2000-2012 the FFmpeg developers Copyright (c) 2000-2012 the FFmpeg developers
built on Aug 30 2012 23:14:02 with gcc 4.2.1 (GCC) (Apple Inc. build 5666) (dot 3)
built on Aug 30 2012 23:14:02 with gcc 4.2.1 (GCC) (Apple Inc. build 5666) (dot 3)
configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --cc=/usr/bin/gcc-4.2 --host-cflags='-Os -w -pipe -march=core2 -msse4 -mmacosx-version-min=10.7' --host-ldflags='-L/usr/local/Cellar/libtool/2.4.2/lib -L/usr/local/Cellar/automake/1.12.3/lib -L/usr/local/Cellar/autoconf/2.69/lib -L/usr/local/Cellar/gettext/0.18.1.1/lib -L/usr/local/lib -L/usr/X11/lib' --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-ffplay
configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --cc=/usr/bin/gcc-4.2 --host-cflags='-Os -w -pipe -march=core2 -msse4 -mmacosx-version-min=10.7' --host-ldflags='-L/usr/local/Cellar/libtool/2.4.2/lib -L/usr/local/Cellar/automake/1.12.3/lib -L/usr/local/Cellar/autoconf/2.69/lib -L/usr/local/Cellar/gettext/0.18.1.1/lib -L/usr/local/lib -L/usr/X11/lib' --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-ffplay
libavutil 51. 70.100 / 51. 70.100
libavutil 51. 70.100 / 51. 70.100
libavcodec 54. 54.100 / 54. 54.100
libavcodec 54. 54.100 / 54. 54.100
libavformat 54. 25.104 / 54. 25.104
libavformat 54. 25.104 / 54. 25.104
libavdevice 54. 2.100 / 54. 2.100
libavdevice 54. 2.100 / 54. 2.100
libavfilter 3. 14.100 / 3. 14.100
libavfilter 3. 14.100 / 3. 14.100
libswscale 2. 1.101 / 2. 1.101
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 15.100 / 0. 15.100
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
libpostproc 52. 0.100 / 52. 0.100
Input #0, avi, from '732.avi':
Metadata:
encoder : Lavf54.25.104
timecode : 00:00:00;00
Duration: 00:00:02.08, start: 0.000000, bitrate: 225548 kb/s
Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le, 720x486, 59.94 tbr, 59.94 tbn, 59.94 tbc
Output #0, rawvideo, to 'pipe:':
Metadata:
timecode : 00:00:00;00
encoder : Lavf54.25.104
Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le, 720x486, q=2-31, 90k tbn, 59.94 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
pipe:: Invalid data found when processing input
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