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  • ffmpeg weird x264 encoding behavior

    1er février 2016, par JMor

    I have a captured a 720x480 video with a display aspect ratio of 16:9 which I want to crop, resize and pad, but just the x264 encoding command is giving me a headache.

    (Screenshot of input.m2v) Here is my command :

    ffmpeg -ss 1861 -i input.m2v -c:v libx264 -profile:v main -preset:v medium -level 3.1 -x264opts crf=21.228 -t 60 -y -f mp4 output.mp4

    And here is the ffmpeg output :

    (Screen shot of output.mp4)

    Input #0, mpegvideo, from 'input.m2v':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: mpeg2video (Main), yuv420p(tv), 720x480 [SAR 32:27 DAR 1
    
6:9], max. 6605 kb/s, 31.02 fps, 59.94 tbr, 1200k tbn, 59.94 tbc
    
[libx264 @ 02ba84c0] using SAR=32/27
    
[libx264 @ 02ba84c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 02ba84c0] profile Main, level 3.1
    
[libx264 @ 02ba84c0] 264 - core 144 r2525 40bb568 - H.264/MPEG-4 AVC codec - Cop
    
yleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
    
lock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
    
e_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chro
    
ma_qp_offset=-2 threads=12 lookahead_threads=2 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=250 keyint_min=25 scene
    
cut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=21.2 qcomp=0.60 qpmin
    
=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to 'output.mp4':
    
  Metadata:
    
    encoder         : Lavf56.19.100
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x48
    
0 [SAR 32:27 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc
    
    Metadata:
    
      encoder         : Lavc56.21.102 libx264
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (libx264))

    The output size is 720x480, displayed as 853x480, as expected.
    But it looks like the frame has been vertically scaled by a factor of 1.18 and then cropped to a height of 480, so that I am losing the top and bottom of the frame. In fact, the behavior is equivalent to :

    -vf "scale=720:569,crop=720:480:0:0"

    Although I assume the aspect ratio plays a part here (I think the 1.18 factor is really (16/9)/(720/480)) I am surprised that ffmpeg would do that out of the blue. May be someone more knowledgeable than me could explain it ?

  • FFMPEG Incorrect Stream Index Matching with -var_stream_map

    28 décembre 2018, par Hugo

    I am using a bash script to run an FFMPEG command to turn an input file called Awoo.mkv into three HLS playlists each with a different resolution, video and audio bitrate.

    This is the script :

    name=gw
    

    
rm /tmp/hls/*
    

    
./ffmpeg -y \
    
    -stream_loop -1 -re \
    
    -i Awoo.mkv \
    
    -b:v:0 4000k -b:a:0 512k -s:0 1920x1080 -r:0 30 -g:0 90 -preset:0 superfast -tune:0 zerolatency -profile:v:0 high -level:v:0 4 \
    
    -b:v:1 2500k -b:a:1 256k -s:1 1280x720 -r:1 30 -g:1 90 -preset:1 superfast -tune:1 zerolatency -profile:v:1 high -level:v:1 4 \
    
    -b:v:2 800k -b:a:2 255k -s:2 960x540 -r:2 30 -g:2 90 -preset:2 superfast -tune:2 zerolatency -profile:v:2 high -level:v:2 4 \
    
    -hls_time 6 \
    
    -hls_list_size 2 \
    
    -hls_flags delete_segments \
    
    -map 0:v -map 0:a -map 0:v -map 0:a -map 0:v -map 0:a \
    
    -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" \
    
    -f hls -master_pl_name "${name}.m3u8" \
    
    -hls_segment_filename "/tmp/hls/${name}_-%d-%v.ts" \
    
    "/tmp/hls/${name}_%v.m3u8"

    This almost works great, but the output is slightly off...

    If you look at these two lines :

    -b:v:1 2500k -b:a:1 256k -s:1 1280x720 -r:1 30 -g:1 90 -preset:1 superfast -tune:1 zerolatency -profile:v:1 high -level:v:1 4 \
    
-b:v:2 800k -b:a:2 255k -s:2 960x540 -r:2 30 -g:2 90 -preset:2 superfast -tune:2 zerolatency -profile:v:2 high -level:v:2 4 \

    A resolution of 1280x720 should have a bitrate of 2500k, a resolution of 960x540 should have a bitrate of 800k.

    This is the relevant output from FFMPEG :

    Stream #0:2(und): Video: h264 (libx264), yuv420p(progressive), 960x540 [SAR 1:1 DAR 16:9], q=-1--1, 2500 kb/s, 30 fps, 90k tbn, 30 tbc (default)
    
Metadata:
    
  CREATION_TIME   : 2017-01-27 05:02:53
    
  LANGUAGE        : und
    
  HANDLER_NAME    : VideoHandler
    
  DURATION        : 00:02:24.310000000
    
  encoder         : Lavc58.18.100 libx264
    
Side data:
    
  cpb: bitrate max/min/avg: 0/0/2500000 buffer size: 0 vbv_delay: -1
    
Stream #0:3(eng): Audio: aac (LC), 44100 Hz, stereo, fltp, 256 kb/s (default)
    
Metadata:
    
  LANGUAGE        : eng
    
  DURATION        : 00:02:24.348000000
    
  encoder         : Lavc58.18.100 aac
    
Stream #0:4(und): Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 800 kb/s, 29 fps, 90k tbn, 29 tbc (default)
    
Metadata:
    
  CREATION_TIME   : 2017-01-27 05:02:53
    
  LANGUAGE        : und
    
  HANDLER_NAME    : VideoHandler
    
  DURATION        : 00:02:24.310000000
    
  encoder         : Lavc58.18.100 libx264
    
Side data:
    
  cpb: bitrate max/min/avg: 0/0/800000 buffer size: 0 vbv_delay: -1
    
Stream #0:5(eng): Audio: aac (LC), 44100 Hz, stereo, fltp, 255 kb/s (default)
    
Metadata:
    
  LANGUAGE        : eng
    
  DURATION        : 00:02:24.348000000
    
  encoder         : Lavc58.18.100 aac

    Stream #0:2 is given the wrong resolution of 960x540, and therefore also the wrong bitrate of 2500. This should be the resolution of 1280x720, but this is below matched with the bitrate of 800.

    From what I know, the resolutions are showing in the wrong order, if 720 was first and 540 after then everything would match up fine. I’m not sure what’s causing this, I am new to the -var_stream_map.

    If it is relevant, the entire output from FFMPEG is below :

    ffmpeg version 4.0.3-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
    
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
    
  libavutil      56. 14.100 / 56. 14.100
    
  libavcodec     58. 18.100 / 58. 18.100
    
  libavformat    58. 12.100 / 58. 12.100
    
  libavdevice    58.  3.100 / 58.  3.100
    
  libavfilter     7. 16.100 /  7. 16.100
    
  libswscale      5.  1.100 /  5.  1.100
    
  libswresample   3.  1.100 /  3.  1.100
    
  libpostproc    55.  1.100 / 55.  1.100
    
Input #0, matroska,webm, from 'Awoo.mkv':
    
  Metadata:
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    MINOR_VERSION   : 0
    
    ENCODER         : Lavf56.40.101
    
  Duration: 00:02:24.35, start: 0.000000, bitrate: 1114 kb/s
    
    Stream #0:0(und): Video: h264 (Main), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 29 fps, 29 tbr, 1k tbn, 58 tbc (default)
    
    Metadata:
    
      CREATION_TIME   : 2017-01-27 05:02:53
    
      LANGUAGE        : und
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:24.310000000
    
    Stream #0:1(eng): Audio: vorbis, 44100 Hz, stereo, fltp (default)
    
    Metadata:
    
      LANGUAGE        : eng
    
      DURATION        : 00:02:24.348000000
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:1 (vorbis (native) -> aac (native))
    
  Stream #0:0 -> #0:2 (h264 (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:3 (vorbis (native) -> aac (native))
    
  Stream #0:0 -> #0:4 (h264 (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:5 (vorbis (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
[libx264 @ 0x664d1c0] using SAR=1/1
    
[libx264 @ 0x664d1c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x664d1c0] profile High, level 4.0, 4:2:0, 8-bit
    
[libx264 @ 0x664d1c0] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=90 keyint_min=9 scenecut=40 intra_refresh=0 rc=abr mbtree=0 bitrate=4000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
[libx264 @ 0x664f080] using SAR=1/1
    
[libx264 @ 0x664f080] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x664f080] profile High, level 4.0, 4:2:0, 8-bit
    
[libx264 @ 0x664f080] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=90 keyint_min=9 scenecut=40 intra_refresh=0 rc=abr mbtree=0 bitrate=2500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
[libx264 @ 0x6680b80] using SAR=1/1
    
[libx264 @ 0x6680b80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x6680b80] profile High, level 4.0, 4:2:0, 8-bit
    
[libx264 @ 0x6680b80] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=800 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
[hls @ 0x6650000] Opening '/tmp/hls/gw_-0-0.ts' for writing
    
[hls @ 0x6650000] Opening '/tmp/hls/gw_-0-1.ts' for writing
    
[hls @ 0x6650000] Opening '/tmp/hls/gw_-0-2.ts' for writing
    
Output #0, hls, to '/tmp/hls/gw_%v.m3u8':
    
  Metadata:
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    MINOR_VERSION   : 0
    
    encoder         : Lavf58.12.100
    
    Stream #0:0(und): Video: h264 (libx264), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 4000 kb/s, 30 fps, 90k tbn, 30 tbc (default)
    
    Metadata:
    
      CREATION_TIME   : 2017-01-27 05:02:53
    
      LANGUAGE        : und
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:24.310000000
    
      encoder         : Lavc58.18.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/4000000 buffer size: 0 vbv_delay: -1
    
    Stream #0:1(eng): Audio: aac (LC), 44100 Hz, stereo, fltp, 512 kb/s (default)
    
    Metadata:
    
      LANGUAGE        : eng
    
      DURATION        : 00:02:24.348000000
    
      encoder         : Lavc58.18.100 aac
    
    Stream #0:2(und): Video: h264 (libx264), yuv420p(progressive), 960x540 [SAR 1:1 DAR 16:9], q=-1--1, 2500 kb/s, 30 fps, 90k tbn, 30 tbc (default)
    
    Metadata:
    
      CREATION_TIME   : 2017-01-27 05:02:53
    
      LANGUAGE        : und
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:24.310000000
    
      encoder         : Lavc58.18.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/2500000 buffer size: 0 vbv_delay: -1
    
    Stream #0:3(eng): Audio: aac (LC), 44100 Hz, stereo, fltp, 256 kb/s (default)
    
    Metadata:
    
      LANGUAGE        : eng
    
      DURATION        : 00:02:24.348000000
    
      encoder         : Lavc58.18.100 aac
    
    Stream #0:4(und): Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 800 kb/s, 29 fps, 90k tbn, 29 tbc (default)
    
    Metadata:
    
      CREATION_TIME   : 2017-01-27 05:02:53
    
      LANGUAGE        : und
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:24.310000000
    
      encoder         : Lavc58.18.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/800000 buffer size: 0 vbv_delay: -1
    
    Stream #0:5(eng): Audio: aac (LC), 44100 Hz, stereo, fltp, 255 kb/s (default)
    
    Metadata:
    
      LANGUAGE        : eng
    
      DURATION        : 00:02:24.348000000
    
      encoder         : Lavc58.18.100 aac
    
[hls @ 0x6650000] Opening '/tmp/hls/gw_0.m3u8.tmp' for writing6.50 bitrate=N/A dup=12 drop=0 speed=0.965x    
    
[hls @ 0x6650000] Opening '/tmp/hls/gw_1.m3u8.tmp' for writing
    
[hls @ 0x6650000] Opening '/tmp/hls/gw_2.m3u8.tmp' for writing
    
[hls @ 0x6650000] Opening '/tmp/hls/gw.m3u8' for writing

  • ffmpeg RTSP MPEG4 to h.264 RTSP not streaming

    25 août 2017, par martyn

    I’m trying to re stream a RTSP feed and convert to h264.

    I’m using the following command line :

    C:\Users\Martyn>ffmpeg -re -i rtsp://192.168.2.207/VideoInput/1/mpeg4/ -preset ultrafast -vcodec libx264 -tune zerolatency -b:v 900k -f rtsp udp://192.168.0.2:1234

    The output I get is :

    C:\Users\Martyn>ffmpeg -re -i rtsp://192.168.2.207/VideoInput/1/mpeg4/ -preset u
    
ltrafast -vcodec libx264 -tune zerolatency -b:v 900k -f rtsp udp://192.168.0.2:1
    
234
    
ffmpeg version N-87043-gf0f48884b0 Copyright (c) 2000-2017 the FFmpeg developers
    

    
  built with gcc 7.2.0 (Rev1, Built by MSYS2 project)
    
  configuration:  --enable-avisynth --enable-gcrypt --enable-libmp3lame --enable
    
-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --
    
enable-cuda --enable-cuvid --enable-schannel --disable-w32threads --extra-cflags
    
=-DPTW32_STATIC_LIB --extra-libs=-lpthread --extra-libs=-lwsock32 --enable-gpl -
    
-disable-debug
    
  libavutil      55. 74.100 / 55. 74.100
    
  libavcodec     57.103.100 / 57.103.100
    
  libavformat    57. 77.100 / 57. 77.100
    
  libavdevice    57.  7.101 / 57.  7.101
    
  libavfilter     6.100.100 /  6.100.100
    
  libswscale      4.  7.103 /  4.  7.103
    
  libswresample   2.  8.100 /  2.  8.100
    
  libpostproc    54.  6.100 / 54.  6.100
    
Input #0, rtsp, from 'rtsp://192.168.2.207/VideoInput/1/mpeg4/':
    
  Metadata:
    
    title           : MC153906N015_Camera_1
    
  Duration: N/A, start: 0.040000, bitrate: N/A
    
    Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 1920x1080 [SAR 1:1 DAR
    
16:9], 25 tbr, 90k tbn, 1k tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
    
Press [q] to stop, [?] for help
    
[libx264 @ 0000000002c422c0] using SAR=1/1
    
[libx264 @ 0000000002c422c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
    
AVX
    
[libx264 @ 0000000002c422c0] profile Constrained Baseline, level 4.0
    
[libx264 @ 0000000002c422c0] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC cod
    
ec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 r
    
ef=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0
    
 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 ch
    
roma_qp_offset=0 threads=8 lookahead_threads=8 sliced_threads=1 slices=8 nr=0 de
    
cimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 ke
    
yint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=900 ra
    
tetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0

    How do I know if this is streaming or not ? when I try to connect to udp ://192.168.0.2:1234 nothing happens.

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