Below there is a list of parameters I wrote down a while ago, it was intended to be a start for a V4L2 MPEG encoder API. But, I never finished it.
So if this is going to be done for V4L2, maybe we could start on this
list. A good start for a parameter list would probably be the .par
files for mpegenc.
Most of the parameters are based on my experiences with the SAA6752 MPEG-2 encoder, so most of these parameters could also be found back in the datasheet of this IC (http://www.semiconductors.philips.com/pip/SAA6752HS_V101.html). I also added VCD related settings, although these are not supported by this encoder.
It is also very likely that not all of these settings are supported by other MPEG encoders or that other MPEG encoders have also other parameters available.
In practice some parameters can also be fixed, depening on a type of system stream or picture size.
Gert
system stream:
- type: elementary stream(ES), packatised elementary stream(s) (PES) program stream(PS), transport stream(TS)
- system bitrate
- PS packet size (DVD: 2048 bytes, VCD: 2324 bytes)
- TS video PID
- TS audio PID
- TS PCR PID
- TS system information tables (PAT, PMT, CAT, NIT and SIT)
audio:
- type: MPEG, AC-3, LPCM
- bitrate
- sampling frequency (DVD: 48 Khz, VCD: 44.1 KHz)
video:
- picturesize (SIF, 1/2 D1, 2/3 D1, D1) and PAL/NTSC norm can be set through excisting V4L2 controls
- GOP (Group Of Pictures) definition:
- N: number of frames per GOP
- M: distance between reference (I,P) frames
- open/closed GOP
- quantiser matrix: inter Q matrix (64 bytes) and intra Q matrix (64 bytes)
- quantiser scale: linear or logarithmic
- scanning: alternate or zigzag
- bitrate mode: CBR (constant bitrate) or VBR (variable bitrate).
- target video bitrate for CBR
- target video bitrate for VBR
- maximum video bitrate for VBR - min. quantiser value for VBR
- max. quantiser value for VBR
- adaptive quantisation value
- return the number of bytes per GOP or bitrate for bitrate monitoring
--
video4linux-list mailing list
Unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe
https://listman.redhat.com/mailman/listinfo/video4linux-list
