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• Ffmpeg generated movie (png -> mp4) has no video

  21 avril 2016, par ILiveForVR

  I have a whole bunch of png’s which I would like to convert into a mp4 video.
  I am using the following command to stich them together :
  ffmpeg -i _2016-04-20_14-51-00-500_%06d.png -pix_fmt yuv420p movie.mp4

  I am getting a file, which has a size so it isn’t empty. But when I play it in VLC or Quicktime it shows the time going by, but it has no video in it. Any idea what I’m doing wrong ?
  I also tried :

  ffmpeg -framerate 1/5 -i _2016-04-20_14-51-00-500_%06d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4

  and

  ffmpeg -r 45 -f image2 -s 1920x1080 -i _2016-04-20_14-51-00-500_%06d.png -vcodec libx264 -crf 25  -pix_fmt yuv420p test.mp4

  But still no video.
  This is the commandline output :

  >ffmpeg -i _2016-04-20_14-51-00-500_%06d.png -pix_fmt yuv420p movie.mp4
  
  ffmpeg version N-79546-g13406b6 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (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-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 22.100 / 55. 22.100
  
    libavcodec     57. 35.100 / 57. 35.100
  
    libavformat    57. 34.102 / 57. 34.102
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 44.100 /  6. 44.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, image2, from '_2016-04-20_14-51-00-500_%06d.png':
  
    Duration: 00:00:02.60, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 8192x4096 [SAR 3779:3779 DAR 2:1], 25 tbr, 25 tbn
  
  [libx264 @ 00000000025851e0] using SAR=1/1
  
  [libx264 @ 00000000025851e0] frame MB size (512x256) > level limit (36864)
  
  [libx264 @ 00000000025851e0] DPB size (4 frames, 524288 mbs) > level limit (1 frames, 184320 mbs)
  
  [libx264 @ 00000000025851e0] MB rate (3276800) > level limit (2073600)
  
  [libx264 @ 00000000025851e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 00000000025851e0] profile High, level 5.2
  
  [libx264 @ 00000000025851e0] 264 - core 148 r2665 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [mp4 @ 0000000002583fc0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, mp4, to 'movie.mp4':
  
    Metadata:
  
      encoder         : Lavf57.34.102
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 8192x4096 [SAR 1:1 DAR 2:1], q=2-31, 25 fps, 12800 tbn
  
      Metadata:
  
        encoder         : Lavc57.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=   65 fps=3.2 q=-1.0 Lsize=   13498kB time=00:00:02.48 bitrate=44585.2kbits/s speed=0.123x    6x
  
  video:13497kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.009971%
  
  [libx264 @ 00000000025851e0] frame I:1     Avg QP:16.71  size:1373751
  
  [libx264 @ 00000000025851e0] frame P:52    Avg QP:23.59  size:234822
  
  [libx264 @ 00000000025851e0] frame B:12    Avg QP:21.17  size: 19609
  
  [libx264 @ 00000000025851e0] consecutive B-frames: 73.8%  3.1%  4.6% 18.5%
  
  [libx264 @ 00000000025851e0] mb I  I16..4: 14.7% 73.8% 11.5%
  
  [libx264 @ 00000000025851e0] mb P  I16..4:  3.1%  5.9%  0.5%  P16..4: 23.2%  7.7%  2.0%  0.0%  0.0%    skip:57.5%
  
  [libx264 @ 00000000025851e0] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8:  9.0%  0.2%  0.0%  direct: 0.2%  skip:90.3%  L0:33.0% L1:66.6% BI: 0.4%
  
  [libx264 @ 00000000025851e0] 8x8 transform intra:63.5% inter:78.5%
  
  [libx264 @ 00000000025851e0] coded y,uvDC,uvAC intra: 33.7% 3.1% 1.0% inter: 10.1% 0.4% 0.0%
  
  [libx264 @ 00000000025851e0] i16 v,h,dc,p: 24% 57%  3% 17%
  
  [libx264 @ 00000000025851e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 31% 38%  2%  3%  2%  5%  2%  4%
  
  [libx264 @ 00000000025851e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 63% 10%  2%  2%  1%  5%  1%  4%
  
  [libx264 @ 00000000025851e0] i8c dc,h,v,p: 94%  2%  3%  0%
  
  [libx264 @ 00000000025851e0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 00000000025851e0] ref P L0: 71.6% 13.1% 10.8%  4.4%
  
  [libx264 @ 00000000025851e0] ref B L0: 69.0% 30.6%  0.4%
  
  [libx264 @ 00000000025851e0] ref B L1: 89.7% 10.3%
  
  [libx264 @ 00000000025851e0] kb/s:42522.38

• Use ffmpeg to edit metadata titles for multiple files

  19 mars 2017, par Nicholas Wireman

  I’d like to be able to add/edit video metadata titles to multiple files at once or with a single command, but I don’t know how to tell ffmpeg to do this.

  I read a similar post on the Ubuntu Forums, but I have never used string manipulation in Linux before, so the commands I’m seeing in the post are way out of my comprehension at the moment, and much of the discussion goes over my head.

  I’ve got all of my video files in a filename format that includes the show name, the episode number, and episode title. For example :

  show_name - episode_number - episode_title.extension

  Bleach - 001 - A Shinigami Is Born !.avi

  Is there a simple way to read the title and episode number from the filename and put it into a metadata tag without having to go through each and every file manually ?

  EDIT 1 : So I found out that I can iterate through files in a directory, and echo the filename, and I was told by a friend to try bash to parse the strings and return values from that to use in the ffmpeg command line. The problem is, I have absolutely no idea how to do this. The string manipulation in bash is very confusing on first look, and I can’t seem to get it to output what I want into my variables. My test bash :

   for file in "Bleach - 206 - The Past Chapter Begins! The Truth from 110 Years Ago.mkv"; do   extension=${file##*.} showName=${file%% *} episode=${file:9:3}; echo Extension: $extension Show: $showName Episode: $episode;    done

  That outputs

  Extension : mkv Show : Bleach Episode : 206

  Which are all the variables I’m going to need, I just don’t know how to move those to be run in ffmpeg now.

  EDIT 2 : I believe I was able, through much trial and error, to find a bash command that would do exactly what I wanted.

  for file in *; do   newname=${file:0:-4}_2 ext=${file##*.} filename=${file} showname=${file%% *} episode=${file:9:3} nameext=${file##*- } title=${nameext%.*};     ffmpeg -i "$filename" -metadata title="$title" -metadata track=$episode -metadata album=$showname -c copy "$newname.$ext";    mv -f "$newname.$ext" "$filename";    done

  This lets me parse the information from the filename, copy it to some variables, and then run ffmpeg using those variables. It outputs to a second file, then moves that file to the original location, overwriting the original. One could remove that section out if you’re not sure about how it’s going to parse your files, but I’m glad I was able to get a solution that works for me.

• h264 : do not pass H264Context to h264_slice_header_parse()

  20 mai 2016, par Anton Khirnov

  h264 : do not pass H264Context to h264_slice_header_parse()
  This should make it more clear that this function does not need any
  
  decoder-global state other than the parameter sets.
  

  • [DBH] libavcodec/h264_refs.c
  • [DBH] libavcodec/h264_slice.c
  • [DBH] libavcodec/h264dec.h