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Old 25th April 2011, 22:58   #1  |  Link
Gew
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Join Date: Jul 2008
Location: Kingston, Jamaica.
Posts: 113
Best way to handle VFR source?

Hi

I have this clip from a mobile phone. It's encoded in Variable Frame Rate, which I'm not much a personal fan of. I seem to have a difficult time editing it. In short, I just want to rotate it 90 degrees, and make a x264 re-encode. Here my MediaInfo output:

Code:
General
Complete name                    : 20110414006.mp4
Format                           : MPEG-4
Format profile                   : Base Media / Version 2
Codec ID                         : mp42
File size                        : 11.7 MiB
Duration                         : 33s 600ms
Overall bit rate                 : 2 922 Kbps
Encoded date                     : UTC 2011-04-14 14:07:23
Tagged date                      : UTC 2011-04-14 14:07:23

Video
ID                               : 1
Format                           : MPEG-4 Visual
Format profile                   : Simple@L4a
Format settings, BVOP            : No
Format settings, QPel            : No
Format settings, GMC             : No warppoints
Format settings, Matrix          : Default (H.263)
Codec ID                         : 20
Duration                         : 33s 433ms
Bit rate mode                    : Variable
Bit rate                         : 2 700 Kbps
Maximum bit rate                 : 3 000 Kbps
Width                            : 640 pixels
Height                           : 480 pixels
Display aspect ratio             : 4:3
Frame rate mode                  : Variable
Frame rate                       : 30.000 fps
Minimum frame rate               : 19.737 fps
Maximum frame rate               : 61.224 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Compression mode                 : Lossy
Bits/(Pixel*Frame)               : 0.293
Stream size                      : 11.3 MiB (96%)
Encoded date                     : UTC 2011-04-14 14:07:23
Tagged date                      : UTC 2011-04-14 14:07:23

Audio
ID                               : 2
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format profile                   : LC
Codec ID                         : 40
Duration                         : 33s 600ms
Bit rate mode                    : Constant
Bit rate                         : 96.0 Kbps
Channel(s)                       : 1 channel
Channel positions                : Front: C
Sampling rate                    : 48.0 KHz
Compression mode                 : Lossy
Stream size                      : 394 KiB (3%)
Encoded date                     : UTC 2011-04-14 14:07:23
Tagged date                      : UTC 2011-04-14 14:07:23
From what it seems, x264.exe manages to hold the timecodes correct in a reencode. I assume this by pulling "x264.exe -o test.mkv 20110414006.mp4", which yielded a correct re-encoded output, same VFR style. However, x264.exe doesn't have any rotate filter. I try Avidemux v2.4, which is my favorite editing tool. It fails, it messes up the frame rate whichever container or setting I choose.

I've heard rumors that ffmpeg.exe has VFR support, and also that there are -vfilters, but my pre-compiled Windows executables don't come with the rotate filter, so I'm all out of luck there.

I've also tried encapsulating the VFR .mp4 via DirectShowSource() in a .AVS script, and simply "re-capture" to a constant frame rate while re-encoding. This fails also, output is all gray. Running Windows 7 x86. Any ideas?
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