hey guys, I am facing an issue while I try to burn a dialog on a large video when I try to reduce the time interval for which it should appear it seizes to show up if the time interval is less than 1 sec while this is not the case with smaller videos and we can go down to approx 0.15 seconds with videos of 44 secs or 40 mins.
I am sharing my encoding code snippet from my shell script ,which is like: #360 version (time ffmpeg -i test.mp4 -profile:v baseline -level 4.0 -vf "scale=-2:360,subtitles='subtitle_test.ass':force_style='FontName=Aaargh/Aaargh.ttf,PrimaryColour=&H664c4c4c" -start_number 0 -hls_time 10 -hls_list_size 0 -f hls /mnt/s3_temp/bucketname/project_id/videos/3342/3428_360_.m3u8" && echo "360 version:" >> encoding_logs.log ) 2>> encoding_logs.log & and the subtitle_test.ass file is like (e.g for 119m 31 s videos which is 3.9 GB) [Script Info] ; Script generated by FFmpeg/Lavc57.24.103 ScriptType: v4.00+ PlayResX: 384 PlayResY: 288 [V4+ Styles] Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding Style: Default,Arial,16,&H99999999,&H99999999,&H0,&H0,0,0,0,0,100,100,0,0,1,0,0,2,10,10,10,0 Style: Hidden,Arial,16,&H99999999,&H99999999,&H0,&H0,0,0,0,0,100,100,0,0,1,0,0,6,10,10,10,0 [Events] Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text Dialogue: 0,0:00:00.00,1:59:31.783,Default,,0,0,0,,dialog1 Dialogue: 0,0:39:50.927,0:39:51.927,Hidden,,0,0,10,,dialog2 Note the timings for dailog2 which is dialog2 start : 0:39:50.927 dialog2 end : 0:39:51.927 dialog2_time_interval = (dialog2 start time- dialog2 end time) = 1 sec what I am trying to achieve is to display the first dialog for the entire length and the second dialog for smallest amount of time possible.For now what I have achieved is for smaller videos of few seconds or few mins the dialog2 appears even when the dialog2_time_interval is less than 1 sec. I got a successful test with dialog2_time_interval=0.15 sec(approximately 150 milliseconds). But with large videos say in above case the dialog2 appears only when the dialog2_time_interval is greater than or equal to 1 sec. I want to know is there a relation between the video length and dialog2_time_interval which i should keep in mind to minimize dialog2_time_interval for video of any length. Moreover I also see a delay of few seconds with the dialog , i.e they appear few milliseconds or secs after they were supposed to appear, is that normal.Thanks. For some reason if the details mentioned here are not enough I have a small blog post relating the same which could through a little more light on this subject here(http://aameer.github.io/cloud-computing-101/). Thanks Regards, AAMEER RAFIQ WANI email: aameer.ra...@gmail.com websites: aameer.github.io <aam...@github.io> LinkedIn: http://in.linkedin.com/in/aameerwani _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
