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• movtextenc : fix handling of utf-8 subtitles

  28 mars 2018, par Philip Langdale

  movtextenc : fix handling of utf-8 subtitles
  See the earlier fix for movtextdec for details. The equivalent bug is
  
  present on the encoder side as well.
  We need to track the text length in 'characters' (which seems to really
  
  mean codepoints) to ensure that styles are applied across the correct
  
  ranges.
  

  • [DH] libavcodec/movtextenc.c

• How to send an mpeg_ts stream verbatim over rtp

  30 mars 2018, par Bruce Adams

  I’m trying to write some software to capture and process data from an mpeg_ts stream.
  As part of this I need, for testing, to generate a test mpeg_ts streams for my software to capture

  One option for this is to save a real stream to disk.
  So with that in mind I have a source transport stream which is being unicast via rtp to my box via port 1234. I can view it in vlc using :

  vlc rtp://@:1234

  and I can move between channels via the "programme" menu.
  subtitles are available but no EPG
  kaffeine works as well but only shows the first channel

  I can save this stream using :

  ffmpeg -i rtp://172.16.13.81:1235 -map 0 -copy_unknown -c copy save_ffmpeg.ts

  note : that rtp ://@:1235 does not work you need your full IP address though udp ://@:1235 does work for udp streams - see https://ffmpeg.zeranoe.com/forum/viewtopic.php?t=2386

  However there is a problem. When I try to open the resulting file save_ffmpeg.ts in VLC
  instead of opening one channel at a time it opens a new window for each channel which indicates an issue.

  If on the other hand I save it using :

  cvlc rtp://@:1235 :demux=dump :demuxdump-file=save_vlc.ts

  the resulting ts file can be viewed as normal.
  What is the difference ?

  Looking at the output of mediainfo on save_ffmpeg.ts vs save_vlc.ts
  I can see that ffmpeg has stripped the streams labelled Menu #1 to Menu #5.

  >mediainfo save_ffmpeg.ts  | grep -E '^[A-Za-z]+ #'
  
  Video #1
  
  Video #2
  
  Video #3
  
  Video #4
  
  Video #5
  
  Audio #1
  
  Audio #2
  
  Audio #3
  
  Audio #4
  
  Audio #5
  
  Audio #6
  
  Audio #7
  
  >mediainfo save_vlc.ts  | grep -E '^[A-Za-z]+ #'
  
  Video #1
  
  Video #2
  
  Video #3
  
  Video #4
  
  Video #5
  
  Audio #1
  
  Audio #2
  
  Audio #3
  
  Audio #4
  
  Audio #5
  
  Audio #6
  
  Audio #7
  
  Menu #1
  
  Menu #2
  
  Menu #3
  
  Menu #4
  
  Menu #5

  I tried adding -map_metadata 0 but to no avail.

  Q1 What is wrong with the ffmpeg command ?
  How do I get it to also save the menu streams ?

  Now I can send the ts that has the menu with ffmpeg using :

  ffmpeg -re -i save_vlc.ts -c copy -f mpegts udp://127.0.0.1:9999

  to get one channel
  but again if I try to send everything :

  ffmpeg -re -i ./save_file.ts -map 0 -map_metadata 0 -copy_unknown -c copy -f rtp_mpegts rtp://127.0.0.1:9999

  then :

  vlc rtp://127.0.0.1:9999

  opens a window for each and every channel.

  Q2 How do I fix this ?

  Q3 What would the equivalent gstreamer commands be to send and recieve ts files ?

  The relevance of the final question is that one of the options being considered for implementing the MPEG_TS reader is gstreamer. Though, it probably warrants a question of its own.

• What is the proper input format for drawtext's timecode option in fluent-ffmpeg (node.js) ?

  24 janvier 2023, par Gil Dekel

  I am trying to generate short video clips from 3 images with a simple millisecond counter at the top left per user request. So far I was able to generate the clips using the videoshow npm lib, no issues here.

  



  However, when I try to add the timer via fluent-ffmpeg's drawtext filter to an already generated video, I run into the following issue.

  



  Here's what I have so far :

  



  ffmpeg('video.mp4')
    .on('error', function(err, stdout, stderr) {
      console.log("ffmpeg stdout:\n" + stdout);
      console.log("ffmpeg stderr:\n" + stderr);
    })
    .videoCodec('libx264')
    .format('mp4')
    .fps(fps)
    .complexFilter([
        {
            filter: 'drawtext',
            options: {
                fontsize: 15,
                timecode: '00\:00\:00\:00',  //<--- Issue is most likely here
                fontsize: 32,
                fontcolor: 'white',
                boxcolor: 'black',
                box: 1
            }
        }
    ]).save('out.mp4');


  



  From what I found online I am quite convinced that my problem is with the timecode input format. Here's my error log :

  



  ffmpeg stderr:
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-nonfree
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:00:01.03, start: 0.000000, bitrate: 585 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x1136 [SAR 923:924 DAR 130:231], 573 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler
[Parsed_drawtext_0 @ 0x7f91aa700700] Both text and text file provided. Please provide only one
[AVFilterGraph @ 0x7f91aa700440] Error initializing filter 'drawtext' with args 'fontsize=32:timecode=00:00:00:00:fontcolor=white:boxcolor=black:box=1'
Error initializing complex filters.
Invalid argument


  



  Specifically this :

  



  [Parsed_drawtext_0 @ 0x7f91aa700700] Both text and text file provided. Please provide only one


  



  When I run what should be the equivalent to my code in shell, it works perfectly :

  



  ffmpeg -i video.mp4 \
       -vf drawtext="fontsize=15:timecode='00\:00\:00\:00':rate=60:fontsize=32:fontcolor='white':\
           boxcolor=0x000000AA:box=1" \
       -f mp4 out.mp4


  



  I already spent a whole day trying to find any previous solutions to this problem, or documentation online regarding the proper format of drawtext's timecode option within node.js with no luck. It seems most of the information out there is for bash/shell use. I need to do this programmatically on a server per request, and I just can't find the right example to solve this.

  



  Any help to resolve this would be appreciated.