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• Rework pixel_var2

  1er mai 2017, par Henrik Gramner

  Rework pixel_var2
  The functions are only ever called with pointers to fenc and fdec and the
  
  strides are always constant so there's no point in having them as parameters.
  Cover both the U and V planes in a single function call. This is more
  
  efficient with SIMD, especially with the wider vectors provided by AVX2 and
  
  AVX-512, even when accounting for losing the possibility of early termination.
  Drop the MMX and XOP implementations, update the rest of the x86 assembly
  
  to match the new behavior. Also enable high bit-depth in the AVX2 version.
  Comment out the ARM, AARCH64, and MIPS MSA assembly for now.
  

  • [DH] common/pixel.c
  • [DH] common/pixel.h
  • [DH] common/x86/pixel-a.asm
  • [DH] common/x86/pixel.h
  • [DH] encoder/macroblock.c
  • [DH] tools/checkasm.c

• Adding metadata with images to audio files using ffmpeg

  8 mai 2017, par Padam Sethia

  UPDATE :
  Not able to embed artwork to audio file , here my command :
  ffmpeg -i ./tmp/Feeling_Good.mp3 -i './tmp/artwork/default.png' -map 0 -map 1 -c copy -codec -id3v2_version 3 -metadata title='Feeling Good' -metadata TPE1='Gryffin' -metadata TPE2='Gryffin' -metadata album='' -metadata genre=' ' ./tmp/fumen_Feeling_Good.mp3

  ERROR :

  [NULL @ 0x106b0e0] Unable to find a suitable output format for '3'
3: Invalid argument

  I want to add album art and meta data at one go to audio files , I have tried this command , but it doesn’t seem to work moreover it creates an empty file.
  Here’s my command :

  ffmpeg -loglevel quiet -i ./tmp/Heres_to_never_growing_up.mp3 -i ./tmp/artwork/default.png -codec copy -id3v2_version 3 -metadata title='Heres to never growing up' -metadata TPE1='Avril Lavigne' -metadata TPE2='Avril Lavigne' -metadata comment='Cover (Front)' -metadata album='unnamed' -metadata genre='unnamed' ./tmp/Heres_to_never_growing_up.mp3

• duration change after transcode ts

  1er mai 2017, par Feilong Luo

  i have a problem about transcode with ffmpeg

  i want to cover m3u8 to mp4, so i transcode every ts file first, and then concat them to a mp4, but i found that the duration will be bigger than source file.

  source file is :
  http://oc7iy3eta.bkt.clouddn.com/src_20.ts

  after transcode, test file is :
  http://oc7iy3eta.bkt.clouddn.com/test_20.ts

  i use the command as bellow to change to 5fps, and 400k bitrate :

  sudo ffmpeg -analyzeduration 2147483647 -probesize 2147483647 -nostdin -y -v warning -i ./src_20.ts -threads 3 -movflags faststart -metadata:s:v rotate=0 -chunk_duration 520000 -video_track_timescale 25000 -pix_fmt yuv420p -copytb 1 -vcodec libx264 -b:v 400000 -minrate 400000 -maxrate 400000 -bufsize 500k -force_key_frames "expr:gte(t,n_forced*2)" -vsync 1 -r 5 -s 544*960 -acodec libfaac -async 1 ./test_20.ts

  i use ffprobe command to see video info :

  source file info :

  Duration : 00:00:01.26, start : 28.346989, bitrate : 921 kb/s
  Program 1
  Metadata :
  service_name : Service01
  service_provider : FFmpeg
  Stream #0:0[0x100] : Audio : aac ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 23 kb/s
  Stream #0:1[0x101] : Video : h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 544x960, 10.67 tbr, 90k tbn, 180k tbc

  test file :

  Input #0, mpegts, from ’test_20.ts’ :
  Duration : 00:00:01.62, start : 1.576778, bitrate : 447 kb/s
  Program 1
  Metadata :
  service_name : Service01
  service_provider : FFmpeg
  Stream #0:0[0x100] : Video : h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 544x960, 5 fps, 5 tbr, 90k tbn, 10 tbc
  Stream #0:1[0x101] : Audio : aac ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 5 kb/s

  =======================================================================

  question

  so , we can see that the duration of src file is 1.26s , but after transcode, the test file is 1.62s.

  why ? can anybody help