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• How to add timecode & Hint Track after concat 2x MP4 to MOV (Quicktime Playback) FFMPEG

  17 février 2019, par Venkatesh R

  What I am trying to achieve :
  After concat 2 files with filter_complex i need to add timecode track and Hint track to the MOV file.

  2x MP4 files >> MOV ( Timecode Track (default:Yes) + Hint Track ( Default:No)

  Issues :

  1. Timecode track is not showing as a tag while playing in QT player like attached screen shot.
  2. If I add Hint Config -movflags rtphintin below command that throws error in quicktime player Error -2002: a bad public movie atom was found in the movie ()

  I have tried below code :

  ffmpeg -ss 00:00:00.000 -t 00:01:00.000 -i Input1.mp4 -ss 00:01:00.001 -t 00:01:00.000 -i Input2.mp4 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1[v] [a]" -map "[v]" -c:v libx264 -aspect 4:3 -s 352:288 -coder 1 -profile:v main -level 3.1 -pix_fmt yuv420p -preset ultrafast -video_track_timescale 25 -g 12 -r 25 -bf 2 -refs 1 -x264-params "keyint_min=12:nal-hrd=cbr:b-pyramid=0" -b:v 2000k -minrate 2000k -maxrate 2000k  -map "[a]" -codec:a libfdk_aac -b:a 192k -vbr 4 -ac 2 -async 1 -timecode 09:59:59:10 -f mov 18785_V1.mov

  ---

  > FFMPEG Media Info : ID                                       : 3
  
  Type                                     : Time code
  
  Format                                   : QuickTime TC
  
  Duration                                 : 2 min 0 s
  
  Time code of first frame                 : 09:59:59:10
  
  Time code, striped                       : Yes
  
  Language                                 : English
  
  Default                                  : No

  Comparison Screenshot of Hardware vs FFMPEG Transcoder

  

• avformat/utils : parse some stream specifiers recursively

  5 février 2019, par Marton Balint

  avformat/utils : parse some stream specifiers recursively
  This removes lots of code duplication and also allows more complex specifiers,
  
  for example you can use p:204:a:m:language:eng to select the English language
  
  audio stream from program 204.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/fftools-common-opts.texi
  • [DH] libavformat/utils.c

• ffmpeg - HLS stream audio error between segmets

  2 février 2019, par Carl

  I have a huge amount of mp4 files to create HLS segments from, more than 200 hours worth of files. I don’t see the point of re-encoding these videos because they are already in mp4 format. I’m using the following command which copies the video into segments instead of encoding it again.

  ffmpeg -i filename.mp4 -codec: copy -start_number 0 -hls_time 4 -hls_list_size 0 -f hls filename.m3u8

  The problem is when it comes to stitching these segments, I’m getting micro audio errors between segments. It’s hard to explain but imagine somebody turning audio off for 0.1 seconds. I doesn’t happen in all of the segments but in 20%-30% of them. Is there anything I can do stop these errors from popping up apart from reencoding all the videos. There are no problems with video btw.

  Here’s media info from one of the files :

  General
  Complete name : C :\video_test\video_file.mp4
  Format : MPEG-4
  Format profile : Base Media / Version 2
  Codec ID : mp42 (isom/iso2/avc1/mp41/mp42)
  File size : 45.7 MiB
  Duration : 7 min 34 s
  Overall bit rate mode : Variable
  Overall bit rate : 844 kb/s
  Writing application : Lavf53.32.100
  

  Video
  ID : 1
  Format : AVC
  Format/Info : Advanced Video Codec
  Format profile : High@L4
  Format settings, CABAC : Yes
  Format settings, RefFrames : 8 frames
  Codec ID : avc1
  Codec ID/Info : Advanced Video Coding
  Duration : 7 min 34 s
  Bit rate : 767 kb/s
  Width : 1 280 pixels
  Height : 720 pixels
  Display aspect ratio : 16:9
  Frame rate mode : Constant
  Frame rate : 30.000 FPS
  Color space : YUV
  Chroma subsampling : 4:2:0
  Bit depth : 8 bits
  Scan type : Progressive
  Bits/(Pixel*Frame) : 0.028
  Stream size : 41.5 MiB (91%)
  Writing library : x264 core 136
  Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=6 / psy=0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=48 / lookahead_threads=5 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=0 / keyint=60 / keyint_min=30 / scenecut=0 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

  Audio
  ID : 2
  Format : AAC
  Format/Info : Advanced Audio Codec
  Format profile : LC
  Codec ID : 40
  Duration : 7 min 34 s
  Bit rate mode : Variable
  Bit rate : 72.0 kb/s
  Maximum 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 : 3.92 MiB (9%)
  Language : English
  Default : Yes
  Alternate group : 1
  

  Edit : I just tried copying video and reencoding the audio with the following command but problem still persists.

  ffmpeg -i filename.mp4 -vcodec copy -c:a aac -ar 48000 -b:a 128k -start_number 0 -hls_time 4 -hls_list_size 0  -f hls filename.m3u8