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• Burn in delayed subtitles

  11 février 2017, par sygi

  I would like to burn subtitles into a video file using a console program. Previously I used ffmpeg to do that :

  ffmpeg -i input.mkv -vf subtitles=sub.srt -strict -2 out.mp4

  However, I am having problems when my subtitles are delayed with regard to the movie. I looked into -ioffset option and setpts filter, but they allow me move the video, but I’d like the video timing to stay unchanged and only burn in the subtitles in a delayed manner.

  Is there a way to do it in ffmpeg (I suppose no, as burning subtitles is a filter and I don’t see a way to "change" a behavior of filters, but I haven’t looked at all of them) ? If not, is there an easy-to-use console program which would delay the subtitles before burning them in ?

• How to apply multiple filters on a frame by AVFilterGraph of FFMPEG in c++

  26 juillet 2022, par hameed abbasi

  I'm trying to do a "crop" and then "eq" filter on an AVFrame but seems i don't understand AVFiltergraph syntax. here is the code :

  


  AVFrame *FFmpegDecoder::cropFrame(AVFrame *frame, int left, int top, int right, int bottom) {
AVFilterContext *buffersink_ctx;
AVFilterContext *buffersrc_ctx;
AVFilterGraph *filter_graph = avfilter_graph_alloc();
AVFrame *f = av_frame_alloc();
AVFilterInOut *inputs = NULL, *outputs = NULL;
char args[512];
int ret;
auto out_w = frame->width - left - right;
auto out_h = frame->height - top - bottom;
snprintf(args, sizeof(args),
         "buffer=video_size=%dx%d:pix_fmt=%d:time_base=1/1:pixel_aspect=0/1[src];"
         "[src]crop=x=%d:y=%d:out_w=%d:out_h=%d[cropped];"
         "[cropped]eq=brightness=0.06:saturation=2:contrast=1[out];"
         "[out]buffersink",
         frame->width, frame->height, frame->format,
         left, top, out_w, out_h);
ret = avfilter_graph_parse2(filter_graph, args, &inputs, &outputs);
if (ret < 0) return NULL;
assert(inputs == NULL && outputs == NULL);
ret = avfilter_graph_config(filter_graph, NULL);
if (ret < 0) return NULL;

buffersrc_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffer_0");
buffersink_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffersink_2");
assert(buffersrc_ctx != NULL);
assert(buffersink_ctx != NULL);

av_frame_ref(f, frame);
ret = av_buffersrc_add_frame(buffersrc_ctx, f);
if (ret < 0) return NULL;
ret = av_buffersink_get_frame(buffersink_ctx, f);
if (ret < 0) return NULL;

avfilter_graph_free(&filter_graph);

return f;


  


  }

  


  In addition, i've tried this :

  


  "buffer=video_size=%dx%d:pix_fmt=%d:time_base=1/1:pixel_aspect=0/1[src] ;"

  


  "[src]crop=x=%d:y=%d:out_w=%d:out_h=%d,eq=brightness=0.06:saturation=2:contrast=1[out] ;"

  


  "[out]buffersink"

  


  but no luck.
Thanks in advance.

  


• i want to add watermark to video with ffmpeg, i want watermark jump to all corners one by one every 5 seconds [duplicate]

  24 mai 2021, par block king

  I am using this code currently for adding watermark and username in the upper left corner I want watermark shifts automatically in the bottom right corner

  


  PHP code :

  


  $cmd = "ffmpeg -i $original_video_file_path -i $watermark -filter_complex \"[0:v][1:v]overlay=20:25, drawtext=fontfile='$font_path':text='@$username':fontcolor=#ffffff:fontsize=18:y=80:x=15\" -c:a copy -movflags +faststart $video_with_watermark";