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• XDCam EX gets some friends

  21 octobre 2009

  Sony has announced a couple new additions to the XDCamEX family - the PMW-350 and the PMW-EX1R.

  The 350 is a shouldermount camera with interchangeable lenses and 2/3" chips. That puts it somewhere between the 1/2" PDW-F355 and the 2/3" 4:2:2 PDW-700.

  

  The EX1R is a minor bump to the EX1, adding features that users have asked for, like a dedicated viewfinder and a DVCam recording mode.

  For me, the most interesting bit of news is that Sony is launching the "MEAD-MS01," an SXS to MemoryStick adapter. I guess Sony noticed that many EX1 and EX3 users have been using SD adapters, and decided to get into that market. And of course, they had to use everyone’s least favorite flash format, Memorystick. I’ll stick to my SD cards for now, but it’s nice to see Sony "legitimize" that recording option a bit.

• fftools/ffmpeg : rework keeping track of file duration for -stream_loop

  11 octobre 2023, par Anton Khirnov

  fftools/ffmpeg : rework keeping track of file duration for -stream_loop
  Current code tracks min/max pts for each stream separately ; then when
  
  the file ends it combines them with last frame's duration to compute the
  
  total duration of each stream ; finally it selects the longest of those
  
  durations as the file duration.
  This is incorrect - the total file duration is the largest timestamp
  
  difference between any frames, regardless of the stream.
  Also change the way the last frame information is reported from decoders
  
  to the muxer - previously it would be just the last frame's duration,
  
  now the end timestamp is sent, which is simpler.
  Changes the result of the fate-ffmpeg-streamloop-transcode-av test,
  
  where the timestamps are shifted slightly forward. Note that the
  
  matroska demuxer does not return the first audio packet after seeking
  
  (due to buggy interaction betwen the generic code and the demuxer), so
  
  there is a gap in audio.
  

  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_dec.c
  • [DH] fftools/ffmpeg_demux.c
  • [DH] fftools/ffmpeg_utils.h
  • [DH] tests/ref/fate/ffmpeg-streamloop-transcode-av

• ffmpeg - how to use pipe with amovie parameter ?

  19 février 2018, par user1347009

  I am looking for a solution to overlay to mp3 files in which the longer one will be played in the background and the smaller one will continue to play like a loop with that.
  My current code is working without pipe :

  ffmpeg -i 'longer.mp3'  -filter_complex "amovie='small.mp3:loop=999'[s];[0][s]amix=duration=shortest" new.mp3

  This code works like a charm but what i want to achieve is this :

  curl "any-url-to-api-to-audio-file" | ffmpeg -i 'longer.mp3'  -filter_complex "amovie='pipe\:0:loop=999'[s];[0][s]amix=duration=shortest" new.mp3

  This code is not working and its giving me error as well,

  ffmpeg version N-89955-g118e1b0b33 Copyright (c) 2000-2018 the FFmpeg 
  
  developers
  
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
  
  configuration: --enable-openssl --enable-libmp3lame
  
  libavutil      56.  7.100 / 56.  7.100
  
  libavcodec     58.  9.100 / 58.  9.100
  
  libavformat    58.  7.100 / 58.  7.100
  
  libavdevice    58.  0.101 / 58.  0.101
  
  libavfilter     7. 11.101 /  7. 11.101
  
  libswscale      5.  0.101 /  5.  0.101
  
  libswresample   3.  0.101 /  3.  0.101
  
  Input #0, mp3, from 'morning_alarm.mp3':
  
  Duration: 00:00:28.06, start: 0.025057, bitrate: 128 kb/s
  
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
  Metadata:
  
  encoder         : LAME3.97 
  
  Side data:
  
  replaygain: track gain - -9.200000, track peak - unknown, album gain - unknown, album peak - unknown, 
  
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                               Dload  Upload   Total   Spent    Left  Speed
  
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     
  
  0101  5088  101  5088    0     0  28080      0 --:--:-- --:--:-- --:--:--  160k
  
  Stream mapping:
  
  Stream #0:0 (mp3) -> amix:input0
  
  amix -> Stream #0:0 (libmp3lame)
  
  Press [q] to stop, [?] for help
  
  [Parsed_amovie_0 @ 0x26c76c0] Failed to avformat_open_input 'pipe:0'
  
  [AVFilterGraph @ 0x26c3d80] Error initializing filter 'amovie' with args 
  
  'pipe\:0:loop=999'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid data found when 
  
  processing input
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!

  All i want to do is to overlay two audio files via command line in which 1st audio file will be longer and the second one will be smaller.
  The smaller one will be repeated like a loop till the longer one play.

  Please tell me how can i do that ?