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I have an mpeg-ts file with a single program. The program consists of some streams - one video stream and some metadata streams.

I would like to extract a specific stream to a separate file. However the metadata is encoded using a codec that ffmpeg doesn't know. I don't really care about this - I just want to extract the data as bytes, without the mpeg-ts container headers. I tried to use codec "copy" but with no success.

I tried the following:

 ffmpeg -i video.ts -map 0:1 -codec copy stream.txt

But ffmpeg says:

 Unable to find a suitable output format for stream.txt

The error above is only because ffmpeg doesn't know how to output a text file. So I tried to output with "rawvideo" container:

 ffmpeg -i video.ts -map 0:1 -codec copy -f rawvideo stream.txt

But:

 Cannot map stream #0:1 - unsupported type

Just to ensure that I can extract a content of an unknown codec I tried the following:

 ffmpeg -i video.ts -map 0:1 -codec copy stream.ts

But again:

 Cannot map stream #0:1 - unsupported type

So my questions are:

  • Can I extract a byte stream of an unknown codec stream? and how?
  • How can I output the byte stream without any container? Should I use the rawvideo?
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2
  • try ffmpeg -i video.ts -map 0:v -c:v copy stream.ts or ffmpeg -i video.ts -an -c:v copy stream.ts Commented Aug 3, 2015 at 21:09
  • The command extracts the video stream. How can I extract the metadata? Commented Aug 4, 2015 at 4:05

2 Answers 2

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5

Use

ffmpeg -i video.ts -map 0:1 -codec copy -f data stream.txt
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5 Comments

Is there some way to then decode the resulting txt into a readable info, for example in csv format?
That entirely depends on the format of the data stream. But don't count on ffmpeg for that.
Hi bro, I tried the following cmd:ffmpeg -i input.ts -map 0:2 -codec copy -f data -ignore_unknown -copy_unknown output.txt
it fails as: ``` Output #0, data, to 'output.txt': Metadata: encoder : Lavf58.76.100 Stream #0:0: Unknown: none ([128][0][0][0] / 0x0080) Stream mapping: Stream #0:2 -> #0:0 (copy) [mpegts xxx] probed stream 2 failed size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Output file is empty, nothing was encoded (check -ss/-t/-frames parameters if used) ``` how to fix this?
You can't have both: -ignore_unknown -copy_unknown. Keep only the latter.
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I'm not sure you can do it with ffmpeg. You can get some information with ffprobe but a better bet would be tstools.

tsinfo yourfile.ts > metadata.txt
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