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• -use_wallclock_as_timestamps adds delay in live stream

  2 novembre 2020, par Arikael

  We have a livestream (MPEG-TS with RTP), which we currently, for testing purposes, replay with tcpreplay.

  


  Our mpeg-ts stream consists of 4 streams (codec details omitted for brevity).

  


  Stream #0:2: Video: h264
Stream #0:1: Audio: mp2
Stream #0:4: Data: bin_data ([6][0][0][0] / 0x0006)
Strean #0:3: Data: bin_data (FBID / 0x4494246)
Stream #0:0: Data: klv (KLVA / 0x41564C4B)


  


  Sometimes the stream indexes are different (like audio stream being stream 0 and so on, I don't know if thats normal behavior)

  


  What we currently try is just to get the stream and copy it with ffmpeg, like

  


  ffmpeg -nostdin -hide_banner -i rtp://239.0.0.2:3000 -map 0 -codec copy -f rtp_mpegts rtp://239.0.0.1:2000`


  


  This leads to the error Application provided invalid, non monotonically incereasing dts to muxer in stream 0: [NUMBER] >= 0

  


  It always says stream 0 no matter what stream 0 contains.

  


  if I add use_wallclock_as_timestamps it works but adds a delay (compared to a video directly streamed from 239.0.0.2:3000 of 10seconds which are never caught up.

  


  If I set the output format to mpegts instead of rpt_mpegts it works as expected, the same I if don't map the KLVA and FBID stream.

  


  Is this behavior expected (because of wallclock) or what can I do to either use_wallclock_as_timestamps without delay or get rid of the error above ?

  


• whether it takes long time for convert flv to MP4 using ffmpeg from server

  29 décembre 2016, par Firman Firdaus

  I want to convert a flv file to mp4. I use with a basic command like this :

  ffmpeg -i /var/www/html/rawmedia/d2cb9f152f27d9beb4a15d61e177fa22.flv /var/www/html/media/new.mp4

  The command above has result 0 B mp4.
  I read for My reference for this in this link,
  there is a very simple and basic I think.
  So I try the command above for testing php vibe command like this :

  ffmpeg -i /var/www/html/rawmedia/d2cb9f152f27d9beb4a15d61e177fa22.flv -vcodec libx264 -s 640x360 -threads 4 -movflags faststart /var/www/html/media/test4.mp4

  I got that command from PHPVIBE for convert other format file except mp4.
  So I got a result just the same as like first command that still 0 B mp4.
  But the Output of the second command give me like this

  Incompatible sample format 's16' for codec 'aac', auto-selecting format 'flt'
  
  [libx264 @ 0xcebde0] using cpu capabilities: none!
  
  [libx264 @ 0xcebde0] profile High, level 3.0
  
  [libx264 @ 0xcebde0] 264 - core 120 r2151 a3f4407 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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=4 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=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [NULL @ 0xd5f1a0] Codec is experimental but experimental codecs are not enabled, see -strict -2
  
  Output #0, mp4, to '/var/www/html/media/test4.mp4':
  
    Metadata:
  
      starttime       : 0
  
      totalduration   : 57
  
      totaldatarate   : 353
  
      bytelength      : 2535814
  
      canseekontime   : true
  
      sourcedata      : B0AFCE7F5HH1428394559963956
  
      purl            :
  
      pmsg            :
  
      Stream #0:0: Video: h264, yuv420p, 640x360, q=-1--1, 90k tbn, 30 tbc
  
      Stream #0:1: Audio: none, 22050 Hz, stereo, flt, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> libx264)
  
    Stream #0:1 -> #0:1 (mp3 -> aac)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  Output give me some information that test.mp4 have bytelength      : 2535814.
  But I still have 0B mp4 converted result until now. Is there taking a time or I was wrong with the command. But especially my first command very basic and still get zero byte result.

• libavcodec/vp8dec : fix the multi-thread HWAccel decode error

  11 juin 2019, par Shaofei Wang

  libavcodec/vp8dec : fix the multi-thread HWAccel decode error
  Fix the issue : https://github.com/intel/media-driver/issues/317
  the root cause is update_dimensions will be called multple times
  
  when decoder thread number is not only 1, but update_dimensions
  
  call get_pixel_format in each decode thread will trigger the
  
  hwaccel_uninit/hwaccel_init more than once. But only one hwaccel
  
  should be shared with all decode threads.
  
  in current context,
  
  there are 3 situations in the update_dimensions() :
  
  1. First time calling. No matter single thread or multithread,
  
     get_pixel_format() should be called after dimensions were
  
     set ;
  
  2. Dimention changed at the runtime. Dimention need to be
  
     updated when macroblocks_base is already allocated,
  
     get_pixel_format() should be called to recreate new frames
  
     according to updated dimension ;
  
  3. Multithread first time calling. After decoder init, the
  
     other threads will call update_dimensions() at first time
  
     to allocate macroblocks_base and set dimensions.
  
     But get_pixel_format() is shouldn't be called due to low
  
     level frames and context are already created.
  In this fix, we only call update_dimensions as need.
  Signed-off-by : Wang, Shaofei <shaofei.wang@intel.com>
  
  Reviewed-by : Jun, Zhao <jun.zhao@intel.com>
  
  Reviewed-by : Haihao Xiang <haihao.xiang@intel.com>
  
  Signed-off-by : Ronald S. Bultje <rsbultje@gmail.com>
  

  • [DH] libavcodec/vp8.c