Avidemux Green Screen

[FrozenInferno]

Hi.

I have an AVC video in an mp4 container with variable frame rate that I want to clip with Avidemux without re-encoding. I extracted the timecodes from it with Avisynth and attached them with mkvmerge. According to MediaInfo, it seems to be at a constant frame rate, but the problem now is that it won't decode properly in Avidemux. All I get is a green screen, and the slider won't move. I should mention it runs perfectly fine in MPC. Any thoughts?

MediaInfo:

General
Unique ID                        : 254048518794086192186076406982705474807 (0xBF1FF708186994808B9F6726B32CECF7)
Complete name                    : C:\Users\Josh\Desktop\Video.mkv
Format                           : Matroska
File size                        : 328 MiB
Duration                         : 23mn 24s
Overall bit rate                 : 1 957 Kbps
Encoded date                     : UTC 2011-04-02 19:23:25
Writing application              : mkvmerge v4.6.0 ('Still Crazy After All These Years') built on Mar 10 2011 02:50:32
Writing library                  : libebml v1.2.0 + libmatroska v1.1.0

Video
ID                               : 1
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : High@L4.0
Format settings, CABAC           : Yes
Format settings, ReFrames        : 8 frames
Format settings, GOP             : N=1
Muxing mode                      : Header stripping
Codec ID                         : V_MPEG4/ISO/AVC
Duration                         : 23mn 24s
Nominal bit rate                 : 1 650 Kbps
Width                            : 1 280 pixels
Height                           : 720 pixels
Display aspect ratio             : 16:9
Frame rate                       : 23.976 fps
Original frame rate              : 24.000 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.075
Writing library                  : x264 core 78 r1310 ec46ace
Encoding settings                : cabac=1 / ref=8 / deblock=1:1:1 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=0.5:0.0 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=6 / nr=0 / decimate=1 / mbaff=0 / constrained_intra=0 / bframes=16 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=0 / keyint=250 / keyint_min=25 / scenecut=40 / rc=2pass / mbtree=0 / bitrate=1650 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00

Audio
ID                               : 2
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format profile                   : LC
Codec ID                         : A_AAC
Duration                         : 23mn 24s
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 48.0 KHz
Compression mode                 : Lossy
Delay relative to video          : -42ms

[poisondeathray]

are you sure it's vfr?

you can't edit vfr video in avidemux

cuts would require editing the timecode file, and remuxing each one into each segment (not easy to do)

[FrozenInferno]

I'm pretty sure the source video is VFR. Here's the MediaInfo file:

General
Complete name                    : C:\Users\Josh\Videos\Anime\Naruto Shippuden\Video.mp4
Format                           : MPEG-4
Format profile                   : Base Media
Codec ID                         : isom
File size                        : 328 MiB
Duration                         : 23mn 24s
Overall bit rate                 : 1 957 Kbps
Encoded date                     : UTC 2009-11-26 06:29:13
Tagged date                      : UTC 2009-11-26 06:29:13

Video
ID                               : 1
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : High@L4.0
Format settings, CABAC           : Yes
Format settings, ReFrames        : 8 frames
Format settings, GOP             : N=1
Codec ID                         : avc1
Codec ID/Info                    : Advanced Video Coding
Duration                         : 23mn 24s
Bit rate mode                    : Variable
Bit rate                         : 1 760 Kbps
Nominal bit rate                 : 1 650 Kbps
Maximum bit rate                 : 7 289 Kbps
Width                            : 1 280 pixels
Height                           : 720 pixels
Display aspect ratio             : 16:9
Frame rate mode                  : Variable
Frame rate                       : 25.598 fps
Original frame rate              : 24.000 fps
Minimum frame rate               : 17.982 fps
Maximum frame rate               : 29.970 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.075
Stream size                      : 295 MiB (90%)
Writing library                  : x264 core 78 r1310 ec46ace
Encoding settings                : cabac=1 / ref=8 / deblock=1:1:1 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=0.5:0.0 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=6 / nr=0 / decimate=1 / mbaff=0 / constrained_intra=0 / bframes=16 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=0 / keyint=250 / keyint_min=25 / scenecut=40 / rc=2pass / mbtree=0 / bitrate=1650 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00
Encoded date                     : UTC 2009-11-26 06:29:13
Tagged date                      : UTC 2009-11-26 06:29:33

Audio
ID                               : 2
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format profile                   : LC
Codec ID                         : 40
Duration                         : 23mn 24s
Bit rate mode                    : Variable
Bit rate                         : 192 Kbps
Maximum bit rate                 : 233 Kbps
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 48.0 KHz
Compression mode                 : Lossy
Stream size                      : 32.5 MiB (10%)
Encoded date                     : UTC 2009-11-26 06:29:30
Tagged date                      : UTC 2009-11-26 06:29:33

So is there no way to convert a VFR video into CFR without re-encoding? I was under the assumption extracting the timecodes and reintegrating them would do the job. MediaInfo seems to show the resulting video is CFR, is this wrong?

[poisondeathray]

You might have done it incorrectly; regardless, mediainfo isn't necessarily correct (it just reads header information)

Also there is no way to edit VFR video without re-encoding (very easily), and there is no way to convert VFR to CFR without re-encoding.

You lose the timecode information when you do cuts = sync issues. You need an editor that preserves timecode information while cutting, but there is no such thing that I know of

The bottom line is you're going to have to re-encode if this is truly VFR video , otherwise you will sync issues



The green screen is another issue , but you can try older mkvtoolix builds or other avidemux builds (incl the nightly builds which handle h.264 better)

[FrozenInferno]

Ok, thanks for the info.