Listen to file creation during FFmpegExecutor run

[MatteoBuffo]

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The question Hi! My command is:

ffmpeg -i "https://bitmovin-a.akamaihd.net/content/dataset/multi-codec/hevc/stream_fmp4.m3u8" -c:a copy -c:v libx264 -f hls -hls_segments_filename "./out/segment%d.ts" -hls_flags delete_segments+append_list ./out/master_playlist.m3u8

that is:

• transcoding an H.265 source to H.264;
• producing a HLS playlist in the local fs;
• live streaming it.

I made it work in a Spring-Boot project with ffmpeg-cli-wrapper. Now, as an upgrade, I would like to make my code "listen to" the creation of master_playlist.m3u8 as soon as this event happens.

Example ffmpeg command

ffmpeg -i [INPUT_PLAYLIST] -c:a copy -c:v libx264 -f hls -hls_flags append_list [OUTPUT_PATH]/[OUTPUT_FILENAME]

What you have tried I wrote this code:

FFmpeg ffmpeg = new FFmpeg([MY_FFMPEG_PATH]);

// Input stream file
String IN = "https://bitmovin-a.akamaihd.net/content/dataset/multi-codec/hevc/stream_fmp4.m3u8";

// Output stream path
String OUT_PATH = "[MY_OUT_PATH]";

// Output stream filename
String OUT_FILE = "[MY_OUT_FILENAME]";

/*
  Command to launch:
  ffmpeg -i [IN] -c:a copy -c:v libx264 -f hls ... [OUT_PATH]/[OUT_FILE]
*/
FFmpegBuilder builder = new FFmpegBuilder()
		.setInput(IN)
		.addOutput(OUT_PATH + "/" + OUT_FILE)
		.addExtraArgs("-c:a", "copy")
		.addExtraArgs("-c:v", "libx264")
		.addExtraArgs("-f", "hls")
		.addExtraArgs("-hls_segment_filename", OUT_PATH + "/segment%d.ts")
		.addExtraArgs("-hls_flags", "delete_segments+append_list")
		.setStrict(FFmpegBuilder.Strict.EXPERIMENTAL)
		.done()
		.setVerbosity(FFmpegBuilder.Verbosity.VERBOSE);

FFmpegExecutor executor = new FFmpegExecutor(ffmpeg);

// Run a one-pass encode
executor.createJob(builder).run();

// This is printed only when the executor ends, but I would like it to happen as soon as master_playlist.m3u8 is created...
System.out.println("Master playlist has been created and can be played now.");

I've learnt from older Issues that the executor is blocking, but I still wonder if there is a way to achieve my goal.

Thanks!