2

I have a video called test_video.mp4 downloaded from YouTube

enter image description here

This is the information of the video obtained by running ffmpeg -i test_video.mp4:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.19.102
  Duration: 00:00:17.62, start: 0.000000, bitrate: 265 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x480 [SAR 1:1 DAR 4:3], 138 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.

I have also a file with subtitles called test_sub.srt:

1
00:00:01,000 --> 00:00:05,000
Hello

2
00:00:10,000 --> 00:00:15,000
World

When I run ffmpeg -i test_video.mp4 -i test_sub.srt -map 0:0 -map 0:1 -map 1:0 -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=eng test_out.mp4, soft subtitles are added:

enter image description here

The problem comes when I try to do the same to a bigger video called test2_video.mp4, I run ffmpeg -i test2_video.mp4 -i test_sub.srt -map 0:0 -map 0:1 -map 1:0 -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=eng test2_out.mp4 but subtitles are not added to test2_out.mp4. This is the information of the video when I run ffmpeg -i test2_video.mp4:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test2_video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:59:11.08, start: 0.000000, bitrate: 2131 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1997 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

Why does this happen?, the version of FFmpeg that I'm running is 4.2.7-0ubuntu0.1

Giacomo1968
  • 58,727
Nau
  • 255

1 Answers1

1

I found the solution, the problem is not FFmpeg, the problem is my default media player: Totem Media Player. For an unknown reason, Totem doesn't show you the subtitles if they're too short in time in comparison with the length of the video, if another sequential subtitle is added to test_sub.srt, but at least until 00:11:51,000 (in this particular example), the subtitles are displayed

1
00:00:01,000 --> 00:00:05,000
Hello

2
00:00:10,000 --> 00:00:15,000
World


3
00:11:50,000 --> 00:11:51,000
.

I know the problem is Totem because I decided to try other media players like VLC and this problem doesn't exist

Nau
  • 255