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Old 27th May 2020, 16:14   #1  |  Link
FLX90
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Posts: 34
MPEG-2 decoding issues

I'm trying to decode a MPEG2 video to AVC with those two lines:
Code:
x264-r3000-33f9e14.exe --fps 24000/1001 --force-cfr --bitrate 20669 --preset veryslow --tune film --bluray-compat --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --keyint 24 --open-gop --slices 4 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 --pass 1 -o outputx.264 input.mkv
x264-r3000-33f9e14.exe --fps 24000/1001 --force-cfr --bitrate 20669 --preset veryslow --tune film --bluray-compat --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --keyint 24 --open-gop --slices 4 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 --pass 2 -o output.264 input.mkv
input video:
Code:
Video
ID                                       : 1
Format                                   : MPEG Video
Format version                           : Version 2
Format profile                           : Main@High
Format settings                          : CustomMatrix / BVOP
Format settings, BVOP                    : Yes
Format settings, Matrix                  : Custom
Format settings, GOP                     : M=3, N=15
Codec ID                                 : V_MPEG2
Codec ID/Info                            : MPEG 1 or 2 Video
Duration                                 : 1 h 50 min
Bit rate mode                            : Variable
Bit rate                                 : 20.7 Mb/s
Maximum bit rate                         : 35.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.416
Time code of first frame                 : 00:00:00:00
Time code source                         : Group of pictures header
GOP, Open/Closed                         : Open
GOP, Open/Closed of first frame          : Closed
Stream size                              : 15.9 GiB (91%)
Default                                  : Yes
Forced                                   : No
I get the following error message:
Code:
[mpeg2video @ 00000000004eed00] ignoring pic cod ext after 0
[mpeg2video @ 0000000002296d00] ignoring pic cod ext after 0
What does that mean and how does it affect the output?
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Old 27th May 2020, 20:45   #2  |  Link
LoRd_MuldeR
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This message almost certainly is not from x264 itself, but from libavcodec (ffmpeg) MPEG-2 decoder.

Could be the result of a broken MPEG-2 bitstream, but does not necessarily mean you will see any "corruptions" in decoded output. Did you check the output for any noticeable issues?

(I'd probably do an encode with ultra-fast settings and check the output for broken frames, just to be sure)
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Last edited by LoRd_MuldeR; 27th May 2020 at 21:00.
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