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• avcodec/libx264 : add support for ROI-based encoding

  10 janvier 2019, par Guo, Yejun

  avcodec/libx264 : add support for ROI-based encoding
  This patch just enables the path from ffmpeg to libx264,
  
  the more encoders can be added later.
  Signed-off-by : Guo, Yejun <yejun.guo@intel.com>
  
  Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  

  • [DH] libavcodec/libx264.c

• Can I add silent audio based on another video, to a video created from a PNG loop

  25 mars 2019, par GDP

  We have videos that we transcode to h.264, but COPY the original audio track (they all vary). We are now trying to prepend a 10 second disclaimer before the original video begins. Apparently the audio tracks of the two videos must be the same, so I’m trying to add a silent audio track to the generated video based on the audio track of the video it will be concatenated with.

  From other questions, I’ve learned to add -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100, but this results in garbled audio when the concatenation occurs. So using ffprobe, I would like to get whatever audio properties are needed and use them in the prepending video.

  So the question is : How can I specify the specific audio track settings I want/need when creating the 10 second video ?

  FFMpeg to create 10 second disclaimer

  ffmpeg.exe -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -loop 1 -i disclaimer.png -filter:v "fade=out:st=8:d=2" -c:v libx264 -t 10 -pix_fmt yuv420p -r 29.97 disclaimer.mp4

  FFProbe

  ffprobe -show_format -show_streams OriginalVideo.mp4
  
  ffprobe version N-73975-gda8b70b Copyright (c) 2007-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 28.100 / 54. 28.100
  
    libavcodec     56. 52.100 / 56. 52.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 27.100 /  5. 27.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'OriginalVideo.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : 343520959333629
  
      encoder         : Lavf56.40.101
  
    Duration: 00:00:24.56, start: 0.160998, bitrate: 245 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x400 [SAR 1615:1616 DAR 323:202], 194 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=1/50
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=640
  
  height=400
  
  coded_width=640
  
  coded_height=400
  
  has_b_frames=2
  
  sample_aspect_ratio=1615:1616
  
  display_aspect_ratio=323:202
  
  pix_fmt=yuv420p
  
  level=31
  
  color_range=N/A
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  timecode=N/A
  
  refs=5
  
  is_avc=1
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=25/1
  
  avg_frame_rate=25/1
  
  time_base=1/90000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=2181600
  
  duration=24.240000
  
  bit_rate=194642
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=606
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  TAG:language=und
  
  TAG:handler_name=VideoHandler
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=HE-AACv2
  
  codec_type=audio
  
  codec_time_base=1/44100
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=44100
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/44100
  
  start_pts=-7100
  
  start_time=-0.160998
  
  duration_ts=1083268
  
  duration=24.563900
  
  bit_rate=47738
  
  max_bit_rate=48053
  
  bits_per_raw_sample=N/A
  
  nb_frames=526
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  TAG:language=und
  
  TAG:handler_name=SoundHandler
  
  [/STREAM]
  
  [FORMAT]
  
  filename=OriginalVideo.mp4
  
  nb_streams=2
  
  nb_programs=0
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  format_long_name=QuickTime / MOV
  
  start_time=-0.160998
  
  duration=24.564000
  
  size=753253
  
  bit_rate=245319
  
  probe_score=100
  
  TAG:major_brand=isom
  
  TAG:minor_version=512
  
  TAG:compatible_brands=isomiso2avc1mp41
  
  TAG:title=343520959333629
  
  TAG:encoder=Lavf56.40.101
  
  [/FORMAT]

• ffmpeg : map audio and subtitle stream of (different) specific language only

  24 juillet 2019, par RocketNuts

  I have a bunch of video files with multiple audio and subtitle streams (in different languages). The streams contain metadata specifying which stream is which langauge. I want to copy all files but maintaining only the spanish audio streams, and the english subtitle streams (and the video stream of course).

  Unfortunately, not all videos contain the same language streams at the same index, so instead of using something like -map 0:a:2 I am trying to select the streams based on metadata.

  However, if I try the following : (based on answers found in similar questions like this and this)

  ffmpeg -i input.mkv -map 0:v -map 0:a:m:language:spa -map 0:s:m:language:eng -c copy output.mkv

  It still copies the first audio and first subtitle stream, no matter which stream is which language. In other words, this behaves just like -map 0:v -map 0:a:0 -map 0:s:0 which isn’t what I need.

  Is there a different map argument I can use to make sure it picks only the spanish audio stream and only the english subtitle stream, regardless of their index in the input file ?