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

I'm trying to decode a MPEG2 video to AVC with those two lines:
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:
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:
[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
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Location: Last House on Slunk Street
Posts: 13,135
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)
There was of course no way of knowing whether you were being watched at any given moment.
How often, or on what system, the Thought Police plugged in on any individual wire was guesswork.

Last edited by LoRd_MuldeR; 27th May 2020 at 21:00.
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