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• FFmpeg to transfer from bad media

  31 décembre 2017, par TheSavo

  I have an SDcard that has two videos recorded from an old phone. The media is bad and I have already run SpinRite and chkdsk, to fix the errors. The files still fail to copy completely.

  I can play some portion of the files in VLC player. It plays about as far as File copy and TeraCopy before the copy job fails.
  They and MP4 files. I would like to use ffmpeg to transfer the portion of the video that will play out. is -i the best parameter ?

  ffmpeg -i H:\badfile.mp4 e:\portion.mp4

  Here is the output from mediainfo if that helps

  Complete name                            : H:\DCIM\badfile.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/3gp4)
File size                                : 422 MiB
Duration                                 : 3 min 46 s
Overall bit rate                         : 15.6 Mb/s
Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, RefFrames               : 1 frame
Format settings, GOP                     : M=1, N=61
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 3 min 45 s
Bit rate                                 : 15.5 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 19.469 FPS
Minimum frame rate                       : 14.085 FPS
Maximum frame rate                       : 30.303 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.385
Stream size                              : 418 MiB (99%)
Title                                    : VideoHandle
Language                                 : English
Encoded date                             : UTC 2013-09-17 13:18:06
Tagged date                              : UTC 2013-09-17 13:18:06
mdhd_Duration                            : 225892

  Audio
  ID : 2
  Format : AAC
  Format/Info : Advanced Audio Codec
  Format profile : LC
  Codec ID : mp4a-40-2
  Duration : 3 min 46 s
  Bit rate mode : Constant
  Bit rate : 128 kb/s
  Nominal bit rate : 96.0 kb/s
  Channel(s) : 2 channels
  Channel positions : Front : L R
  Sampling rate : 44.1 kHz
  Frame rate : 43.066 FPS (1024 SPF)
  Compression mode : Lossy
  Stream size : 3.46 MiB (1%)
  Title : SoundHandle
  Language : English
  Encoded date : UTC 2013-09-17 13:18:06
  Tagged date : UTC 2013-09-17 13:18:06

• Transfer audio with ffmpeg, unexpected silent at the beginning [duplicate]

  4 mai 2018, par LouisCJT

  This question already has an answer here :

  • ffmpeg wrong audio file after conversion in AAC
    
    1 answer
    
  • Why does libmp3lame add zeros to the start of the MP3 ?
    
    1 answer
    

  I was using ffmpeg to transfer the format of audio files, like from .wav to mp3. The transfer seemed fine and the audio sounds as expected. However when I check its waveform, I found that after the transfer,

  1. A small portion of silent (and with some very tiny noise) is at the beginning of the output audio. The length is about 1 ms 0.001 sec.

  2. As the silent part is appended, the end of the audio is altered - the length of the output audio is longer than the input file. (my input is exactly 10 sec, now the output is around 10.1 sec.

  Need the transfer precise because need to do further analysis frame by frame, and this situation could not go well. I used the following command to transfer a file.

  ffmpeg -I ..\wav_1K_32bit_24576kbps_384000Hz_stereo.wav -vn -ar 12000 -ac 2 -ab 320000 -f MP3 MP3_12000Hz_32kbps_stereo_VBROff.MP3

  ---

  Please refer to the screen crop of waveform view.

  Beginning of audio, input (U) & output (L)

  End of audio, input (U) & output (L)

  Thank you !

• avformat/mxfenc : Write transfer characteristic

  21 mars 2018, par Michael Niedermayer

  avformat/mxfenc : Write transfer characteristic
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mxfenc.c
  • [DH] tests/ref/fate/copy-trac4914
  • [DH] tests/ref/fate/mxf-reel_name
  • [DH] tests/ref/fate/time_base
  • [DH] tests/ref/lavf/mxf
  • [DH] tests/ref/lavf/mxf_d10
  • [DH] tests/ref/lavf/mxf_dv25
  • [DH] tests/ref/lavf/mxf_dvcpro50
  • [DH] tests/ref/lavf/mxf_opatom
  • [DH] tests/ref/lavf/mxf_opatom_audio