Divisible height/width

[muschellij2]

Ran into this in the past with ffmpeg, so I figured it may be a good use case for vfilter or something to put as a check so users can see a way to fix it. The error is shown in the std_err where it says width not divisible by 2 (959x720). Fix from https://stackoverflow.com/questions/20847674/ffmpeg-libx264-height-not-divisible-by-2 shows that this works.

library(av)
    outfile = tempfile(fileext = ".mp4")
    xx = av_demo(width = 959, output = outfile)
#> Error: FFMPEG error in 'avcodec_open2': Generic error in an external library
    xx
#> Error in eval(expr, envir, enclos): object 'xx' not found
    file.exists(outfile)
#> [1] FALSE
    
    xx = av_demo(width = 959, output = outfile,
                 vfilter = "scale=trunc(iw/2)*2:trunc(ih/2)*2")
    xx
#> NULL
    file.exists(outfile)
#> [1] TRUE

standard output and standard error

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width not divisible by 2 (959x720)

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using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
profile High, level 6.0
264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=5 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=5 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/var/folders/1s/wrtqcpxn685_zk570bnx9_rr0000gr/T//RtmpTITrPW/fileef6a6a48f65.mp4':
  Metadata:
    encoder         : Lavf58.12.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 958x720, q=-1--1, 90k tbn
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s

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 - video stream completed!
Audio stream complete!
frame I:151   Avg QP:13.84  size:  5818
mb I  I16..4: 61.1% 33.4%  5.5%
8x8 transform intra:33.4%
coded y,uvDC,uvAC intra: 2.9% 2.3% 1.7%
i16 v,h,dc,p: 86% 10%  4%  0%
i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 66%  4% 31%  0%  0%  0%  0%  0%  0%
i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 49% 23% 18%  1%  2%  2%  2%  2%  2%
i8c dc,h,v,p: 86%  5%  9%  0%
kb/s:232.71
Qavg: 348.080
[WARNING] Could not parse YAML metadata at line 1 column 1: :6:25: Unexpected '
  '

Created on 2018-10-06 by the reprex
package (v0.2.0).

[jeroen]

So are you suggesting that we verify that the width/height are even?

[muschellij2]

Don't know best course of action. Warning? Error? Or add in the truncation so it will work with a warning?

[muschellij2]

I'd say enforce divisible height/width when output type is mp4 as libx264 requires it.