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• FFMPEG CLI Language Metadata Tagging Output MP4 (Video + Audio) File

  12 juin 2017, par DMtd

  Can anyone help me understand why my attempts at tagging an audio track with language metadata using FFMPEG CLI is failing ? I’ve found various pieces of information on the correct syntax for the tag which I’m still not clear on (so part 1 of my question is what is the correct syntax), but even if I get it right (which I may or may not have), I am wondering if FFMPEG is failing to tag my audio track because my source is wrapped/muxed with a video essence. Does this preclude the ability to language tag ?

  Worth noting, attempts have been made from both MP4 and MKV sources (video and audio) to MP4 (video and audio) and M4A, MP4 and AAC audio only outputs with no success.

  Also worth noting, I’ve also tried using the -metadata title tag with no success.

  I am looking for the following metadata to show up in a mediainfo advanced mode check :

  Language : en
  Language : English

  Here is my command line :

  ffmpeg -i "input.mkv" -c:v libx264 -level:v 3.0 -b:v 5000k -bufsize 4300k -flags +ildct+ilme -top 1 -x264opts tff=1:colorprim=bt470bg:transfer=bt470m:colormatrix=bt470bg -vf crop=720:576:0:32 -pix_fmt yuv420p -c:a aac -b:a 128k -metadata language="eng" -aspect 4:3 -y "output.mp4"

• Understanding ffmpeg input stream information

  9 juillet 2017, par David Parks

  When running ffmpeg I get the following input/output/stream statements. I need to understand the details here.

  $ ffmpeg -y -nostdin -f v4l2 -framerate 30 -video_size 1920x1080 -c:v mjpeg -i /dev/video1 -c:v copy /tmp/v1.mov
  
  
  
  Input #0, video4linux2,v4l2, from '/dev/video1':
  
    Duration: N/A, start: 762195.237801, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  
  
  Output #0, mov, to '/tmp/v1.mov':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: mjpeg (jpeg / 0x6765706A), yuvj422p, 1920x1080, q=2-31, -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  frame= 1685 fps= 30 q=-1.0 Lsize=  212483kB time=00:00:56.08 bitrate=31036.6kbits/s    

  I want to connect 2 USB cameras over a USB 3.0 hub. My cameras are USB 2.0 cameras. Running 2 cameras at low resolution or framerate works, but at high resolution/framerate, I run out of USB bandwidth.

  Does Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown) means that
  ffmpeg is receiving both the compresses mjpeg stream and and
  uncompressed yuv stream ? If this is the case it explains the bandwidth
  issue. I ask because I can see that the compressed bitrate is only 31 Mbit in the Stream mapping section.

  My question would then become, can I force the camera to only
  stream the compressed mjpeg stream ?

  p.s. I know I can plug the cameras into separate USB ports, but I only have 3 ports and need to record 6 cameras, so I need at least 2 cameras per USB (3.0) hub.

• FFmpeg ogg - Invalid data found when processing input

  28 juillet 2017, par Earinor

  I am trying to change the framerate of a Video of mine. Below there is the example Input and the Output. I Built ffmpeg myself and I’m pretty sure I miss the right decoder/demuxer but I have no Idea what I need. I thought —enable-libtheora would be enough to enable, muxers, demuxers, encoder and decoder, but apperently there is somehting missing. Does anybody have an idea about this ?

  I have inserted path-to-ffmpeg to make this shorter, the Path itself is okay, so no worries about that.

     *path-to-ffmpeg*\ffmpeg>ffmpeg -i Video.ogg -filter "minterpolate='fps=60'" out.ogg
  
  ffmpeg version 3.3.git Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (x86_64-posix-seh-rev2, Built by MinGW-W64 project)
  
    configuration: --disable-encoders --disable-decoder=hevc --disable-decoder=raw
  
  video --disable-decoder=ac3 --disable-decoder=flac --disable-decoder=ffwavesynth
  
   --disable-decoder=libcelt --disable-decoder=libgsm --disable-decoder=libilbc --
  
  disable-decoder=libopus --disable-decoder=dvbsub --disable-decoder=dvdsub --disa
  
  ble-hwaccels --disable-parsers --disable-bsfs --disable-protocols --disable-inde
  
  vs --disable-outdevs --disable-devices --disable-filters --disable-muxers --disa
  
  ble-demuxers --enable-muxer=ogg --enable-zlib --enable-libtheora --enable-libvor
  
  bis --enable-shared --enable-encoder=libtheora --enable-encoder=libvorbis --enab
  
  le-demuxer=image2 --enable-filter=framerate --enable-protocol=file --enable-filt
  
  er=minterpolate --enable-filter=scale
  
    libavutil      55. 61.100 / 55. 61.100
  
    libavcodec     57. 93.100 / 57. 93.100
  
    libavformat    57. 72.101 / 57. 72.101
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 85.100 /  6. 85.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
  Video.ogg: Invalid data found when processing input