Stream with the closed captions packets attached to that output (experimental; only for EIA-608 / CEA-708 for now). The subcc streams are created after all the normal streams, in the order of: the corresponding stream. For example, if there is 'out19+subcc', 'out7+subcc' and up to 'out42', the. Read EIA-608 captions and re-mux into Mpegts as stream Im successfully transcoding a udp input MPEG2 TS stream into h264 with NVENC and multicasting it onto the network. The last piece of the puzzle is to be able to read in the EIA-608 embedded CCs in the original video stream and re-mux into the output TS as a separate stream.
I'm a lit bit crazy with some especific video files. I want to decode them using ffmpeg and C, specifically decode 608 Closed Captions. The AVI file format/codec is DVCPRO at SD(720x480) resolution.
The enconder is 'Matrox DSX AVI file. Build: 1.0.0.451' That's was ok, until moment i tried to see or decode 608 closed captions. There was nothing at line 21. So, i decid to play this file in Matrox Sample Video Player(an example of their SDK) and for my surprise there was 608 closed captions. So, i read Matrox SDK documentation, and found this. Code: 'Using closed caption informationSome of the Matrox NTSC codecs can extract the closed caption information from thevideo buffers and store it as metadata in the compressed buffer.
On decompression,these same codecs can restore the lines to their proper position. Other NTSC codecsjust encode the closed caption lines as video data. The closed caption lines that areextracted are defined by the EIA-608 specification. The two lines are defined as lines21 from both the first and second fields.The following codecs keep the closed caption lines as metadata (NTSC only):. Matrox DV (encode and decode).
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Matrox MPEG-2 I-frame (encode and decode). Ultra fast receipt thermal printer tm200 drivers for mac windows 10. Matrox MPEG-2 IBP, except 720×512 resolution (decode only).The following codecs keep the closed caption lines as video data (NTSC only):. Matrox D10 (encode and decode). Matrox MPEG-2 IBP in 720 ×512 resolution (decode only). Matrox M-JPEG (decode only).' /bSo, i thought that VBI or Closed Caption(608) will be stored at some metadata. But, exploring the entire file, i found nothing 'hide' in metadata.
Even in frames metadata. Is like magic. There is nothing in line 21 and nothing in metadata's. So, how Matrox sample example is the only one video player that show's it? Hey, i got some news.There is something very interesting in this case. The MAtrox Sample Player 'Flex Channel Tester' treatsthis video as 720x486 instead 720x480. And this, makes all sense, cause in digital video, the analog line21, needs a few more lines, what leaves as 486 instead 480 pixels.So, i know maybe i am being stuped asking what i will ask you guys now.but, if try force(changing sourcecode of course) ffmpeg treat this video stream as 720x486, forcing decoder uses additional bytes maybe canwork to bring back full video displayiung the CC608 on top?Yeah.
I know it sounds stupped.