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• Reducing the bit rate is dropping the audio stream [closed]

  19 février 2013, par user977505

  I'm a newbie to the ffmpeg, x264 commands and conversion. So please bear w/ me.

  I've a H.264 content w/ very high bit rate and I'm using ffmepg, x264 commands to reduce the bit rate. The bit rate is getting reduced but the problem is the output doesn't have the audio stream anymore.

  Here are the commands, I'm using :

  ffmpeg.exe  -i King_Maker_Leader.mp4 -pix_fmt yuv420p -vf scale=1024:576 -r 24 \
    -f yuv4mpegpipe - | x264.exe  —bitrate 1664 —demuxer y4m \
    —preset slow —ref 3 —threads 6 —thread-input —no-scenecut \
    —no-interlaced —stats King_Maker_Leader.stats —vbv-bufsize 3328000 \
    —vbv-maxrate 1996 —pass 1 —output NUL —profile main —level 3.1 —sar 1:1 \
    —tune film —keyint 96 -
  ffmpeg.exe  -i King_Maker_Leader.mp4 -pix_fmt yuv420p -vf scale=1024:576 \
  
    -r 24 -f yuv4mpegpipe - | x264.exe  —bitrate 1664 —demuxer y4m \
  
    —preset slow —ref 3 —threads 6 —thread-input —no-scenecut \
  
    —no-interlaced —stats King_Maker_Leader.stats —vbv-bufsize 3328000 \
  
    —vbv-maxrate 1996 —pass 2 —output King_Maker_Leader_generated.mp4 \
  
    —profile main —level 3.1 —sar 1:1 —tune film —keyint 96 -
  

  I cannot figure out what is wrong with the above commands.

  I'm attaching the partial logs from pass 2 command that show the input has two streams (video and audio) and the output has only video stream.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '..\yathrakkarude_sathruka.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.6.101
  
    Duration: 00:01:00.37, start: 0.000000, bitrate: 8587 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x576 [
  
  SAR 16:11 DAR 20:11], 8073 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 508
  
   kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, yuv4mpegpipe, to 'pipe:':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.25.104
  
      Stream #0:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p, 1024x576 [SA
  
  R 45:44 DAR 20:11], q=2-31, 200 kb/s, 90k tbn, 24 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> rawvideo)
  
  Press [q] to stop, [?] for help
  
  [yuv4mpegpipe @ 016d5800] Encoder did not produce proper pts, making some up.
  
  y4m [info]: 1024x576p 45:44 @ 24/1 fps (cfr)
  
  x264 [info]: using SAR=1/1
  
  x264 [warning]: VBV buffer (2000000) > level limit (14000)
  
  x264 [info]: using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT

• Reducing the bit rate is dropping the audio stream [closed]

  19 février 2013, par user977505

  I'm a newbie to the ffmpeg, x264 commands and conversion. So please bear w/ me.

  I've a H.264 content w/ very high bit rate and I'm using ffmepg, x264 commands to reduce the bit rate. The bit rate is getting reduced but the problem is the output doesn't have the audio stream anymore.

  Here are the commands, I'm using :

  ffmpeg.exe  -i King_Maker_Leader.mp4 -pix_fmt yuv420p -vf scale=1024:576 -r 24 \
    -f yuv4mpegpipe - | x264.exe  —bitrate 1664 —demuxer y4m \
    —preset slow —ref 3 —threads 6 —thread-input —no-scenecut \
    —no-interlaced —stats King_Maker_Leader.stats —vbv-bufsize 3328000 \
    —vbv-maxrate 1996 —pass 1 —output NUL —profile main —level 3.1 —sar 1:1 \
    —tune film —keyint 96 -
  ffmpeg.exe  -i King_Maker_Leader.mp4 -pix_fmt yuv420p -vf scale=1024:576 \
  
    -r 24 -f yuv4mpegpipe - | x264.exe  —bitrate 1664 —demuxer y4m \
  
    —preset slow —ref 3 —threads 6 —thread-input —no-scenecut \
  
    —no-interlaced —stats King_Maker_Leader.stats —vbv-bufsize 3328000 \
  
    —vbv-maxrate 1996 —pass 2 —output King_Maker_Leader_generated.mp4 \
  
    —profile main —level 3.1 —sar 1:1 —tune film —keyint 96 -
  

  I cannot figure out what is wrong with the above commands.

  I'm attaching the partial logs from pass 2 command that show the input has two streams (video and audio) and the output has only video stream.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '..\yathrakkarude_sathruka.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.6.101
  
    Duration: 00:01:00.37, start: 0.000000, bitrate: 8587 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x576 [
  
  SAR 16:11 DAR 20:11], 8073 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 508
  
   kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, yuv4mpegpipe, to 'pipe:':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.25.104
  
      Stream #0:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p, 1024x576 [SA
  
  R 45:44 DAR 20:11], q=2-31, 200 kb/s, 90k tbn, 24 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> rawvideo)
  
  Press [q] to stop, [?] for help
  
  [yuv4mpegpipe @ 016d5800] Encoder did not produce proper pts, making some up.
  
  y4m [info]: 1024x576p 45:44 @ 24/1 fps (cfr)
  
  x264 [info]: using SAR=1/1
  
  x264 [warning]: VBV buffer (2000000) > level limit (14000)
  
  x264 [info]: using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT

• ffmpeg encoded hls makes audio and video progressively out of sync

  21 septembre 2020, par eschie

  When trying to encoding a source .mp4 to multiple bitrates and sizes for adaptive HLSv3 playback the resulting audio and video become progressively out of sync. When scrubbing to a later point it seems to reset, and stay in sync.

  



  I'm on the latest ffmpeg 4.2.1 via homebrew-ffmpeg, with the libfdk-aac codec. Note, this was also occurring with ffmpeg 4.1.

  



  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1-with-options_1 --enable-shared --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libaom --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --disable-libjack --disable-indev=jack --enable-opencl --enable-videotoolbox --disable-htmlpages --enable-libfdk-aac --enable-nonfree
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100


  



  The audio and video streams are marginally off, would that cause this problem ?

  



  ffprobe -v error -select_streams v:0 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 INPUT_FILE.mp4
80.480400

  



  ffprobe -v error -select_streams a:0 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 INPUT_FILE.mp4
80.469333

  



  Here is some metadata on the source file :

  



  General
Complete name                            : INPUT_VIDEO.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (mp42/mp41)
File size                                : 236 MiB
Duration                                 : 1 min 21 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 24.2 Mb/s
Encoded date                             : UTC 2019-08-27 22:13:53
Tagged date                              : UTC 2019-08-27 22:15:15
TIM                                      : 00;00;00;00
TSC                                      : 30000
TSZ                                      : 1001

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L4.1
Format settings                          : CABAC / 2 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 1 min 21 s
Bit rate mode                            : Variable
Bit rate                                 : 23.8 Mb/s
Maximum bit rate                         : 768 kb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 29.970 (30000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.383
Stream size                              : 233 MiB (99%)
Language                                 : English
Encoded date                             : UTC 2019-08-27 22:13:53
Tagged date                              : UTC 2019-08-27 22:13:53
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 1 min 21 s
Source duration                          : 1 min 21 s
Bit rate mode                            : Constant
Bit rate                                 : 317 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 3.10 MiB (1%)
Source stream size                       : 3.10 MiB (1%)
Language                                 : English
Encoded date                             : UTC 2019-08-27 22:13:53
Tagged date                              : UTC 2019-08-27 22:13:53


  



  And the encoding command :

  



  ffmpeg \
-i INPUT_VIDEO \
-dn \
-sn \
-filter_complex \
"[0:v]fps=fps=24000/1001, \
setpts=(PTS-STARTPTS), \
split=12[vsplit1][vsplit2][vsplit3][vsplit4][vsplit5][vsplit6][vsplit7][vsplit8][vsplit9][vsplit10][vsplit11][vsplit12]; \
[vsplit1]scale=-1:1080[video_1080_4.1]; \
[vsplit2]scale=-1:720[video_720_4.1]; \
[vsplit3]scale=-1:720[video_720_3.1]; \
[vsplit4]scale=-1:540[video_540_3.1]; \
[vsplit5]scale=-1:432[video_432_3.1]; \
[vsplit6]scale=-1:270[video_270_3.0]; \
[vsplit7]scale=-1:270[video_270_3.1]; \
[vsplit8]scale=-1:144[video_144_4.1]; \
[vsplit9]scale=-1:144[video_144_3.0]; \
[vsplit10]scale=1920:1080[base_1080]; \
[vsplit11]scale=1280:720[base_720]; \
[vsplit12]scale=640:360[base_360]" \
\
-map "[video_1080_4.1]" \
-r:v:0 "24000/1001" \
-c:v:0 "libx264" \
-x264-params:0 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:0 "slow" \
-profile:v:0 "high" \
-level:v:0 "4.1" \
-refs:v:0 "2" \
-b-pyramid:v:0 "strict" \
-tune:v:0 "film" \
-b:v:0 "4800000" \
-maxrate:v:0 "4800000" \
-bufsize:v:0 "6*4800000/8" \
-vsync:v:0 "cfr" \
-bsf:v:0 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_720_4.1]" \
-r:v:1 "24000/1001" \
-c:v:1 "libx264" \
-x264-params:1 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:1 "slow" \
-profile:v:1 "main" \
-level:v:1 "4.1" \
-refs:v:1 "2" \
-b-pyramid:v:1 "strict" \
-tune:v:1 "film" \
-b:v:1 "3200000" \
-maxrate:v:1 "3200000" \
-bufsize:v:1 "6*3200000/8" \
-vsync:v:1 "cfr" \
-bsf:v:1 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_720_3.1]" \
-r:v:2 "24000/1001" \
-c:v:2 "libx264" \
-x264-params:2 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:2 "slow" \
-profile:v:2 "main" \
-level:v:2 "3.1" \
-refs:v:2 "2" \
-b-pyramid:v:2 "strict" \
-tune:v:2 "film" \
-b:v:2 "2200000" \
-maxrate:v:2 "2200000" \
-bufsize:v:2 "6*2200000/8" \
-vsync:v:2 "cfr" \
-bsf:v:2 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_540_3.1]" \
-r:v:3 "24000/1001" \
-c:v:3 "libx264" \
-x264-params:3 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:3 "slow" \
-profile:v:3 "main" \
-level:v:3 "3.1" \
-refs:v:3 "2" \
-b-pyramid:v:3 "strict" \
-tune:v:3 "film" \
-b:v:3 "1400000" \
-maxrate:v:3 "1400000" \
-bufsize:v:3 "6*1400000/8" \
-vsync:v:3 "cfr" \
-bsf:v:3 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_432_3.1]" \
-r:v:4 "24000/1001" \
-c:v:4 "libx264" \
-x264-params:4 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:4 "slow" \
-profile:v:4 "main" \
-level:v:4 "3.1" \
-refs:v:4 "2" \
-b-pyramid:v:4 "strict" \
-tune:v:4 "film" \
-b:v:4 "900000" \
-maxrate:v:4 "900000" \
-bufsize:v:4 "6*900000/8" \
-vsync:v:4 "cfr" \
-bsf:v:4 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_270_3.0]" \
-r:v:5 "24000/1001" \
-c:v:5 "libx264" \
-x264-params:5 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:5 "slow" \
-profile:v:5 "baseline" \
-level:v:5 "3.0" \
-refs:v:5 "2" \
-b-pyramid:v:5 "strict" \
-tune:v:5 "film" \
-b:v:5 "400000" \
-maxrate:v:5 "400000" \
-bufsize:v:5 "6*400000/8" \
-vsync:v:5 "cfr" \
-bsf:v:5 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_270_3.1]" \
-r:v:6 "24000/1001" \
-c:v:6 "libx264" \
-x264-params:6 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:6 "slow" \
-profile:v:6 "main" \
-level:v:6 "3.1" \
-refs:v:6 "2" \
-b-pyramid:v:6 "strict" \
-tune:v:6 "film" \
-b:v:6 "200000" \
-maxrate:v:6 "200000" \
-bufsize:v:6 "6*200000/8" \
-vsync:v:6 "cfr" \
-bsf:v:6 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_144_4.1]" \
-r:v:7 "24000/1001" \
-c:v:7 "libx264" \
-x264-params:7 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:7 "slow" \
-profile:v:7 "high" \
-level:v:7 "4.1" \
-refs:v:7 "2" \
-b-pyramid:v:7 "strict" \
-tune:v:7 "film" \
-b:v:7 "64000" \
-maxrate:v:7 "64000" \
-bufsize:v:7 "6*64000/8" \
-vsync:v:7 "cfr" \
-bsf:v:7 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[video_144_3.0]" \
-r:v:8 "24000/1001" \
-c:v:8 "libx264" \
-x264-params:8 "keyint=144:min-keyint=144:scenecut=0:open_gop=0" \
-preset:v:8 "slow" \
-profile:v:8 "baseline" \
-level:v:8 "3.0" \
-refs:v:8 "2" \
-b-pyramid:v:8 "strict" \
-tune:v:8 "film" \
-b:v:8 "56000" \
-maxrate:v:8 "56000" \
-bufsize:v:8 "6*56000/8" \
-vsync:v:8 "cfr" \
-bsf:v:8 "h264_metadata=fixed_frame_rate_flag=1" \
\
-map "[base_1080]" \
-c:v:9 "libx264" \
-preset:v:9 "slow" \
\
-map "[base_720]" \
-c:v:10 "libx264" \
-preset:v:10 "slow" \
\
-map "[base_360]" \
-c:v:11 "libx264" \
-preset:v:11 "slow" \
\
-map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 -map a:0 \
-c:a "libfdk_aac" \
-ar "48000" \
-ab "128k" \
-af "aresample=async=1:min_hard_comp=0.100000:first_pts=0" \
\
-f tee \
-flags +global_header \
"[select=\'v:0,a:0,v:1,a:1,v:2,a:2,v:3,a:3,v:4,a:4,v:5,a:5,v:6,a:6,v:7,a:7,v:8,a:8\':f=hls:hls_flags=discont_start+temp_file:hls_time=6:hls_list_size=0:var_stream_map=\'v:0,a:0 v:1,a:1 v:2,a:2 v:3,a:3 v:4,a:4 v:5,a:5 v:6,a:6 v:7,a:7 v:8,a:8\':master_pl_name=playlist.m3u8:hls_segment_filename=INPUT_VIDEO__%v_%03d.ts]INPUT_VIDEO/out_%v.m3u8|[select=\'v:9,a:9\':f=mp4:movflags=+faststart]INPUT_VIDEO/large-1920-1080.mp4|[select=\'v:10,a:10\':f=mp4:movflags=+faststart]INPUT_VIDEO/med-1280-720.mp4|[select=\'v:11,a:11\':f=mp4:movflags=+faststart]INPUT_VIDEO/sm-640-360.mp4"