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• ffmpeg and pulse audio creating buzzy speech

  17 juin 2017, par flashape

  I’m attempting to record video and audio from an ec2 instance (Ubuntu 16.04), using xvfb and pulse audio. Everything works fine, except that the output file contains "buzzy" speech (not sure if this is what "clipping" is ?). This happens using either aac or mp3 audio codecs.

  Sample audio file : http://s000.tinyupload.com/index.php?file_id=86237391396073526211

  ffmpeg command :

  ffmpeg \
  
  -f x11grab -framerate 30 -video_size ${SCREEN_WIDTH}x${SCREEN_HEIGHT} -i :1.0 \
  
  -f pulse -i default \
  
  -c:v libx264 -preset veryfast -maxrate 2500k -bufsize 2500k -vf "format=yuv420p" -g 60 \
  
  -c:a aac -strict -2 -channel_layout stereo  -ab 256k -ar 48000 -bufsize 512k -ac 2  \
  
  -flags +global_header -f flv "test.mp4"

  The output from ffmpeg when I run the command :

  Input #0, x11grab, from ':1.0':
  
    Duration: N/A, start: 1497567394.762052, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1360x764, 30 fps, 30 tbr, 1000k tbn, 30 tbc
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, pulse, from 'default':
  
    Duration: N/A, start: 1497567396.743667, bitrate: 1536 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  [libx264 @ 0x1977d20] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x1977d20] profile High, level 3.2
  
  [libx264 @ 0x1977d20] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 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=3 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=1 keyint=60 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=2500 vbv_bufsize=512 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, flv, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1360x764, q=-1--1, max. 2500 kb/s, 30 fps, 1k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 libx264
  
      Stream #0:1: Audio: aac ([10][0][0][0] / 0x000A), 48000 Hz, stereo, fltp, 256 kb/s
  
      Metadata:
  
        encoder         : Lavc56.60.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))

  Based on various posts, I thought it might be something in the pulse config, particularly the "resample-method" setting, but that doesn’t appear to do anything. Here is how the /etc/pulse/daemon.conf config file currently stands :

  ; daemonize = no
  
  ; fail = yes
  
  ; allow-module-loading = yes
  
  ; allow-exit = yes
  
  ; use-pid-file = yes
  
  ; system-instance = no
  
  ; local-server-type = user
  
  ; enable-shm = yes
  
  ; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB
  
  ; lock-memory = no
  
  ; cpu-limit = no
  
  
  
  ; high-priority = yes
  
  ; nice-level = -11
  
  
  
  ; realtime-scheduling = yes
  
  ; realtime-priority = 5
  
  
  
  ; exit-idle-time = 20
  
  ; scache-idle-time = 20
  
  
  
  ; dl-search-path = (depends on architecture)
  
  
  
  ; load-default-script-file = yes
  
  ; default-script-file = /etc/pulse/default.pa
  
  
  
  ; log-target = auto
  
  ; log-level = notice
  
  ; log-meta = no
  
  ; log-time = no
  
  ; log-backtrace = 0
  
  
  
  ; resample-method = speex-float-1
  
  ; resample-method = speex-float-10
  
  resample-method = speex-fixed-10
  
  ; enable-remixing = yes
  
  enable-lfe-remixing = yes
  
  ; lfe-crossover-freq = 120
  
  
  
  flat-volumes = no
  
  
  
  ; rlimit-fsize = -1
  
  ; rlimit-data = -1
  
  ; rlimit-stack = -1
  
  ; rlimit-core = -1
  
  ; rlimit-as = -1
  
  ; rlimit-rss = -1
  
  ; rlimit-nproc = -1
  
  ; rlimit-nofile = 256
  
  ; rlimit-memlock = -1
  
  ; rlimit-locks = -1
  
  ; rlimit-sigpending = -1
  
  ; rlimit-msgqueue = -1
  
  ; rlimit-nice = 31
  
  ; rlimit-rtprio = 9
  
  ; rlimit-rttime = 200000
  
  
  
  ; default-sample-format = s16le
  
  default-sample-format = s32le
  
  default-sample-rate = 44100
  
  ; default-sample-rate = 48000
  
  ; alternate-sample-rate = 48000
  
  alternate-sample-rate = 44100
  
  ; default-sample-channels = 2
  
  ; default-channel-map = front-left,front-right
  
  
  
  ; default-fragments = 4
  
  ; default-fragment-size-msec = 25
  
  ; default-fragments = 4
  
  ; default-fragment-size-msec = 25
  
  
  
  
  
  ; enable-deferred-volume = yes
  
  deferred-volume-safety-margin-usec = 1
  
  ; deferred-volume-extra-delay-usec = 0

  Edit :

  Ok, updated the ffmpeg command to capture only the audio, but still have the same issue :

  ffmpeg \
  
  -f pulse -i default \
  
  -c:a aac -strict -2 -channel_layout stereo  -ab 256k -ar 48000 -bufsize 512k -ac 2  \
  
  test.aac

  I do get some interesting messages in the output about timestamps being off :

  [aac @ 0x12a4900] Queue input is backward in timeits/s
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 182857 >= 175924
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 182857 >= 176948
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 182857 >= 177972
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 182857 >= 178996
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 182857 >= 180020
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 182857 >= 181044
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 182857 >= 182068
  
  [aac @ 0x12a4900] Queue input is backward in time
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 183406
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 184430
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 185454
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 186478
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 187502
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 188526
  
  [aac @ 0x12a4900] Queue input is backward in time
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 189550
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 190574
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 169622
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 170646
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 171670
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 172694
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 173718
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 174742
  
  [aac @ 0x12a4900] Queue input is backward in time
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 175766
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 176790
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 157020
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 158083
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 159107
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 160131
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 161155
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 162179
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 163203
  
  [aac @ 0x12a4900] Queue input is backward in time
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 164227
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 165251
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 154697
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 159400
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 160424
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 161448
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 162472
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 163496
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 164520
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 165544
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 166568
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 171795
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 172819
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 173843
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 174867
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 175891
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 176915
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 177939
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 178963
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 187279
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 189829
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 190853
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 191877
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 193354 >= 192901
  
  [aac @ 0x12a4900] Queue input is backward in time
  
      Last message repeated 2 times
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 216609 >= 216172
  
  [aac @ 0x12a4900] Queue input is backward in time
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 216609 >= 214950
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 216609 >= 214933
  
  [adts @ 0x12a35a0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 216609 >= 214836

• Permission issue with php + supervisord + ffmpeg + NAS + beanstalkd

  20 juin 2014, par Srini Vasan

  Im running a process using the following tools :

  php - process application
  
  beanstalkd - queue
  
  supervisord - process daemon
  
  ffmpeg - media conversion
  
  NAS - storage device

  The end result (media conversion) works perfectly, when i run the command manually as root user :

  ie. php /path/workers/media_processor.php < /dev/null &

  ie. ffmpeg takes the source mp3 file (which is on the NAS, path x) and output mp3 file also saved on NAS, path y

  But, when i run this via supervisor, ffmpeg is not generating the output mp3 as expected :
  when i also tried via lame encoder (audio encoder), the out file is not generated.

  When I changed the destination path (not NAS) to a different one (within the server),
  ffmpeg/lame is able to write file to the new server path.

  Below is my supervisor conf.

  [program:media_processor_audio]
  
  command=/usr/bin/php /path/workers/media_processor.php < /dev/null
  
  numprocs=1
  
  numprocs_start=1
  
  autostart=true
  
  autorestart=true
  
  stopsignal=QUIT
  
  log_stdout=true
  
  logfile=/path/workers/media_processor_audio.txt

  Im sure, the supervisord is running my process as root user only.
  I’ve confirmed this with get_current_user()

  Summary :

  ffmpeg/lame is able to write to NAS while running the comand manually.

  ffmpeg/lame is not able to write to NAS while the command runs via supervisord.

  Please Help. Thanks in advance.

  Regards,
  Srini

• avcodec/mpegvideo : Fix psnr calculation with slice threads

  13 juin 2014, par Michael Niedermayer

  avcodec/mpegvideo : Fix psnr calculation with slice threads
  This fixes a race condition and use of the wrong field, which become shared
  
  instead of per thread during some AVFrame changes.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/mpegvideo.h
  • [DH] libavcodec/mpegvideo_enc.c