[FFmpeg-user] 2-pass ENcoding with mpeg (switching from mencoder)

[James Board]

>> What would be an example for doing 2-pass encoding, with the libx264

>> codec, at a video rate of 10 million bits per second, and merely copy the
>> audio from input file to output file, and using an mp4 format?
>
>ffmpeg -y -i INPUT -an -c:v libx264 -preset veryslow -fastfirstpass 1 -f
>rawvideo -b:v 10000000 -pass 1 NUL
>ffmpeg -y -I INPUT -c:a copy -c:v libx264 -preset veryslow -b:v 10000000
>-pass 2 OUTPUT.mp4

I tried your commands to do 2-pass encoding with ffmpeg.  The input file
was a short 6 second video clip.  Both commands and their output are listed
below.  The first command seemed seemed okay, but the second command failed.


> ffmpeg -y -i IN.avi -an -c:v libx264 -preset veryslow -fastfirstpass 1 -f rawvideo -b:v 10000000 -pass 1 NUL
ffmpeg version N-54733-gab5f581 Copyright (c) 2000-2013 the FFmpeg developers
  configuration: --enable-libfreetype --enable-gpl --enable-libx264
  libavutil      52. 39.100 / 52. 39.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.102 / 55. 12.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 80.101 /  3. 80.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[avi @ 0x2645b00] Stream #0: not enough frames to estimate rate; consider increasing probesize
[avi @ 0x2645b00] Stream #1: not enough frames to estimate rate; consider increasing probesize
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, avi, from 'IN.avi':
  Duration: 00:00:05.74, start: 0.000000, bitrate: 997780 kb/s
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1920x1080, 29.97 tbr, 29.97 tbn, 29.97 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
No pixel format specified, yuv422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x2649ee0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x2649ee0] profile High 4:2:2, level 4.0, 4:2:2 8-bit
Output #0, rawvideo, to 'NUL':
  Metadata:
    encoder         : Lavf55.12.102
    Stream #0:0: Video: h264 (libx264), yuv422p, 1920x1080, q=-1--1, pass 1, 10000 kb/s, 90k tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
Press [q] to stop, [?] for help
frame=  172 fps= 23 q=-1.0 Lsize=    7709kB time=00:00:05.67 bitrate=11133.7kbits/s
video:7709kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.000000%
[libx264 @ 0x2649ee0] frame I:2     Avg QP:11.39  size:300209
[libx264 @ 0x2649ee0] frame P:39    Avg QP:18.47  size: 83146
[libx264 @ 0x2649ee0] frame B:131   Avg QP:19.79  size: 30925
[libx264 @ 0x2649ee0] consecutive B-frames:  1.2%  0.0% 14.0% 41.9% 20.3% 17.4%  0.0%  0.0%  5.2%
[libx264 @ 0x2649ee0] mb I  I16..4: 25.5%  0.0% 74.5%
[libx264 @ 0x2649ee0] mb P  I16..4: 39.8%  0.0%  0.0%  P16..4: 50.6%  0.0%  0.0%  0.0%  0.0%    skip: 9.6%
[libx264 @ 0x2649ee0] mb B  I16..4:  6.3%  0.0%  0.0%  B16..8: 37.7%  0.0%  0.0%  direct:19.8%  skip:36.2%  L0:38.2% L1:41.8% BI:20.0%
[libx264 @ 0x2649ee0] final ratefactor: 17.47
[libx264 @ 0x2649ee0] direct mvs  spatial:90.1% temporal:9.9%
[libx264 @ 0x2649ee0] coded y,uvDC,uvAC intra: 37.2% 72.0% 37.1% inter: 17.7% 33.7% 2.2%
[libx264 @ 0x2649ee0] i16 v,h,dc,p: 29% 42% 19% 10%
[libx264 @ 0x2649ee0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 27% 10%  6%  6%  7%  5%  7%  5%
[libx264 @ 0x2649ee0] i8c dc,h,v,p: 42% 25% 24%  9%
[libx264 @ 0x2649ee0] Weighted P-Frames: Y:2.6% UV:2.6%
[libx264 @ 0x2649ee0] kb/s:11004.23


> ffmpeg -y -i IN.avi -c:a copy -c:v libx264 -preset veryslow -b:v 10000000 -pass 2 OUT.mp4
ffmpeg version N-54733-gab5f581 Copyright (c) 2000-2013 the FFmpeg developers
  configuration: --enable-libfreetype --enable-gpl --enable-libx264
  libavutil      52. 39.100 / 52. 39.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.102 / 55. 12.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 80.101 /  3. 80.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[avi @ 0x1b2a9c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
[avi @ 0x1b2a9c0] Stream #1: not enough frames to estimate rate; consider increasing probesize
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, avi, from 'IN.avi':
  Duration: 00:00:05.74, start: 0.000000, bitrate: 997780 kb/s
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1920x1080, 29.97 tbr, 29.97 tbn, 29.97 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
No pixel format specified, yuv422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x1b2edc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x1b2edc0] profile High 4:2:2, level 5.1, 4:2:2 8-bit
[libx264 @ 0x1b2edc0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1
ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00
mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11
fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3
sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3
weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40
intra_refresh=0 rc_lookahead=60 rc=2pass mbtree=1 bitrate=10000 ratetol=1.0
qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 cplxblur=20.0 qblur=0.5 ip_ratio=1.40
aq=1:1.00
[mp4 @ 0x1b2e500] Tag [1][0][0][0]/0x00000001 incompatible with output codec id '65536' ([0][0][0][0])
output #0, mp4, to 'OUT.mp4':
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 1920x1080, q=-1--1, pass 2, 10000 kb/s, 90k tbn, 29.97 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
  Stream #0:1 -> #0:1 (copy)
Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input