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• Capture video using FFmpeg in Android

  3 juillet 2015, par Robert Miller

  I’ve made a simple camera app just to learn how to capture video on an Android device. The clip is currently recorded with the help of the MediaRecorder library. A preview is shown in a VideoView before recording starts, and continues to show this during the actual recording.
  As I have understood, recording of videos can also be done by creating an Intent and calling an external Activity, which would result in the previous activity to be paused and destroyed (correct ?).

  Anyways, for this project I prefer the first approach, to not leave the activity. But unfortunately, I experience issues with the MediaRecorder library due to a known bug (which by the way seems to have been around for years). So now I have come across FFmpeg and this "TouchToRecord" (link below) demo project that uses FFmpeg Recorder from JavaCV to capture videos by touching the screen. Awesome ! Except that I do not want to start the camera as a new activity, as they do in this example. I want to remain in the same activity and see the preview and record in a VideoView directly. To touch the VideoView to record isn’t necessary.
  Do you think it’s possible to use the same library (JavaCvVideoRecorder), as the creator of this demo project have been using, to do this ? Or is there a better way which I have not yet discovered ?

  In the end, all I want to do is being able to record video directly into a VideoView, without using the MediaRecorder library.

  Link to demo project : https://github.com/sourab-sharma/TouchToRecord

• Short HLS MPEG2 Video Segments Do Not Play

  24 août 2019, par Jon H

  I’ve been attempting to cut a video into small segments (words), to be rearranged. While I’ve been able to do it with FFMPEG, cutting into segments and using the fast concat demuxer to reassemble the segments, I am trying to speed it up.

  I have been doing this by splitting the original video into short MPEG2 .ts segments for each word :

  ffmpeg -ss 1 -to 1.5 -i "source.mp4" -c:v libx264 -b:v 1200k -c:a aac -b:a 192k -hls_flags single_file "word.ts"

  I have then tried making a m3u8 playlist of these short video segments, but I found that only segments around 2 seconds or more, play at all.

  I then tried using the ’cat’ command to join these segments into a single file, which I understand should be possible with MPEG2 streams. However, this did not play all the segments either.

  To test if all the segments were present in this concatenated file, I used FFMPEG to convert it back into an MP4 file, and all the segments were present.

  I would appreciate any suggestions on producing the segments, and concatenating individual segments simply without FFMEPG. My project isn’t viable if having to call FFMPEG each time, but would work great if I can simply concatenate words together.

• Anomalie #3622 : .raccourcis en colonne gauche

  21 décembre 2017, par chan kalan

  ceci dit, la règle overflow-wrap : break-word ; pourrait aussi convenir, peut-être mieux...