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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 ?

• FFPLAY read mp4 file from HTTP sever : report error : stream 1, offset 0x1c33 : partial file

  25 mai 2018, par whmiao

  I use command line like :

  ffplay http://192.168.4.56:5656/files/video/failed_111.mp4

  output :
  ffplay version N-87130-g2b9fd15 Copyright (c) 2003-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)
  configuration : —enable-gpl —enable-version3 —enable-cuda —enable-cuvid —enable-d3d11va —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-zlib
  libavutil 55. 74.100 / 55. 74.100
  libavcodec 57.104.100 / 57.104.100
  libavformat 57. 79.100 / 57. 79.100
  libavdevice 57. 8.100 / 57. 8.100
  libavfilter 6.101.100 / 6.101.100
  libswscale 4. 7.103 / 4. 7.103
  libswresample 2. 8.100 / 2. 8.100
  libpostproc 54. 6.100 / 54. 6.100
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000025048e0] stream 1, offset 0x1c33 : partial file
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000025048e0] Could not find codec parameters for stream 0 (Video : h264 (avc1 / 0x31637661), none(tv, bt709), 544x960, 1140 kb/s) : unspecified pixel format
  Consider increasing the value for the ’analyzeduration’ and ’probesize’ options

  I download the file,Open local storage,It works well,like :

  ffplay e:\failed_111.mp4

  file can download from :
  https://pan.baidu.com/s/19H9cl3YAjG-AK60nIn0KzQ

• FFMPEG Optional Entries in -var_stream_map

  16 juillet 2022, par Baa

  I have a script that records an x11 display and outputs three HLS streams.

  



  ./ffmpeg -y \
    -f x11grab -framerate 60 -s 1920x1080 -i :1.0 \
    -c:v:0 libx264 -c:s:0 copy -c:a:0 aac -b:v:0 4000k -b:a:0 512k -s:v:0 1920x1080 -r:0 30 -g:0 90 -preset:0 superfast -tune:0 zerolatency -level:v:0 4 -f flv \
    -c:v:1 libx264 -c:s:1 copy -c:a:1 aac -b:v:1 2500k -b:a:1 256k -s:v:1 1280x720 -r:1 30 -g:1 90 -preset:1 superfast -tune:1 zerolatency -level:v:1 4 -f flv \
    -c:v:2 libx264 -c:s:2 copy -c:a:2 aac -b:v:2 800k -b:a:2 256k -s:v:2 960x540 -r:2 30 -g:2 90 -preset:2 superfast -tune:2 zerolatency -level:v:2 4 -f flv \
    -hls_time 6 \
    -hls_list_size 2 \
    -hls_flags delete_segments \
    -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? \
    -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}_%v-%d.ts" \
    -max_muxing_queue_size 1024 \
    "/tmp/hls/${name}_%v.m3u8"


  



  This line :

  



  -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? -map 0:v -map 0:a? -map 0:s? \


  



  Has question marks after each 0:a, this is because the input does not always have audio, so it ignores the error when there is no audio present, and maps it when there is.

  



  However, the following switch :

  



  -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" \


  



  Will only work if there is audio present, is there a way I can have -var_stream_map with entries that will ignore errors like -map does ?

  



  Here are the errors if I try to use this current script with no audio :

  



  [hls @ 0x6231800] Unable to map stream at a:0
[hls @ 0x6231800] Variant stream info update failed with status ffffffea
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 --


  



  If it's relevant, here is the entire output :

  



  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
[x11grab @ 0x6229300] 16 bits per pixel screen is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[x11grab @ 0x6229300] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':1.0':
  Duration: N/A, start: 1546439595.240575, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[16] / 0x10424752), rgb565le, 1920x1080, 60 fps, 1000k tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (rawvideo (native) -> h264 (libx264))
  Stream #0:0 -> #0:2 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x62334c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x62334c0] profile High 4:4:4 Predictive, level 4.0, 4:4:4, 8-bit
[libx264 @ 0x62334c0] 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=0x1:0x1 me=dia subme=1 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 chroma_qp_offset=6 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 @ 0x6234840] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x6234840] profile High 4:4:4 Predictive, level 4.0, 4:4:4, 8-bit
[libx264 @ 0x6234840] 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=0x1:0x1 me=dia subme=1 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 chroma_qp_offset=6 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 @ 0x6235740] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x6235740] profile High 4:4:4 Predictive, level 4.0, 4:4:4, 8-bit
[libx264 @ 0x6235740] 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=0x1:0x1 me=dia subme=1 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 chroma_qp_offset=6 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=800 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[hls @ 0x6231800] Unable to map stream at a:0
[hls @ 0x6231800] Variant stream info update failed with status ffffffea
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 -- 
[libx264 @ 0x62334c0] frame I:1     Avg QP:31.45  size: 91065
[libx264 @ 0x62334c0] mb I  I16..4: 56.4%  0.0% 43.6%
[libx264 @ 0x62334c0] final ratefactor: 36.79
[libx264 @ 0x62334c0] coded y,u,v intra: 42.4% 8.7% 11.4%
[libx264 @ 0x62334c0] i16 v,h,dc,p: 53% 32% 11%  5%
[libx264 @ 0x62334c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 20% 14%  8%  6%  6%  6%  5%  6%
[libx264 @ 0x62334c0] kb/s:21855.60
[libx264 @ 0x6234840] frame I:1     Avg QP:30.27  size: 62907
[libx264 @ 0x6234840] mb I  I16..4: 48.6%  0.0% 51.4%
[libx264 @ 0x6234840] final ratefactor: 35.22
[libx264 @ 0x6234840] coded y,u,v intra: 53.9% 14.2% 17.2%
[libx264 @ 0x6234840] i16 v,h,dc,p: 49% 36% 11%  5%
[libx264 @ 0x6234840] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 19% 15%  8%  7%  6%  6%  6%  6%
[libx264 @ 0x6234840] kb/s:15097.68
[libx264 @ 0x6235740] final ratefactor: 29.77
Conversion failed!