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Determining sequence of multiple streams output from FFMPEG to pipe

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0

I'm currently running ffmpeg, taking a video as input and by way of a complex filter:

• Splitting it into multiple streams


• For each stream, apply a set of filters (each filter performs a different transform)

After that, I map each of the streams to output a sequence of PNG images.

Currently, I'm writing everything to pipe:1 (stdout) so that the program that launches ffmpeg can process the output.

Each of the streams has a need to be processed separately in the calling program.

As a result, I want to tag the PNGs with something to identify how they should be processed (so that I may sequence them properly in the merged output stream). The tEXt chunk type in PNGs would be perfect for this.

The question is, how do can I have ffmpeg encode that chunk (or some other piece of metadata) into the PNG?

Currently, I am trying the following:

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input, this is downloaded from an HTTPS URL> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

But it doesn't create any additional chunks in the PNGs that are streamed to the pipe.

I've also tried the metadata filter, like so:

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>,metadata=add:key=mykey:value=mytag1[out1];[in2]<some other filter>,metadata=add:key=mykey:value=mytag2[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

But that doesn't produce any additional metadata in the PNG stream.

Is this possible, or do I have to find another way to somehow separate the streams and process them?

ffmpeg

share|improve this question

edited 4 hours ago

casperOne

asked 23 hours ago

casperOnecasperOne

116118

add a comment | 

0

I'm currently running ffmpeg, taking a video as input and by way of a complex filter:

• Splitting it into multiple streams


• For each stream, apply a set of filters (each filter performs a different transform)

After that, I map each of the streams to output a sequence of PNG images.

Currently, I'm writing everything to pipe:1 (stdout) so that the program that launches ffmpeg can process the output.

Each of the streams has a need to be processed separately in the calling program.

As a result, I want to tag the PNGs with something to identify how they should be processed (so that I may sequence them properly in the merged output stream). The tEXt chunk type in PNGs would be perfect for this.

The question is, how do can I have ffmpeg encode that chunk (or some other piece of metadata) into the PNG?

Currently, I am trying the following:

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input, this is downloaded from an HTTPS URL> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

But it doesn't create any additional chunks in the PNGs that are streamed to the pipe.

I've also tried the metadata filter, like so:

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>,metadata=add:key=mykey:value=mytag1[out1];[in2]<some other filter>,metadata=add:key=mykey:value=mytag2[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

But that doesn't produce any additional metadata in the PNG stream.

Is this possible, or do I have to find another way to somehow separate the streams and process them?

ffmpeg

share|improve this question

edited 4 hours ago

casperOne

asked 23 hours ago

casperOnecasperOne

116118

add a comment | 

I'm currently running ffmpeg, taking a video as input and by way of a complex filter:

• Splitting it into multiple streams


• For each stream, apply a set of filters (each filter performs a different transform)

After that, I map each of the streams to output a sequence of PNG images.

Currently, I'm writing everything to pipe:1 (stdout) so that the program that launches ffmpeg can process the output.

Each of the streams has a need to be processed separately in the calling program.

As a result, I want to tag the PNGs with something to identify how they should be processed (so that I may sequence them properly in the merged output stream). The tEXt chunk type in PNGs would be perfect for this.

The question is, how do can I have ffmpeg encode that chunk (or some other piece of metadata) into the PNG?

Currently, I am trying the following:

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input, this is downloaded from an HTTPS URL> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

But it doesn't create any additional chunks in the PNGs that are streamed to the pipe.

I've also tried the metadata filter, like so:

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>,metadata=add:key=mykey:value=mytag1[out1];[in2]<some other filter>,metadata=add:key=mykey:value=mytag2[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

But that doesn't produce any additional metadata in the PNG stream.

Is this possible, or do I have to find another way to somehow separate the streams and process them?

ffmpeg

share|improve this question

edited 4 hours ago

casperOne

asked 23 hours ago

casperOnecasperOne

116118

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input, this is downloaded from an HTTPS URL> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

ffmpeg 

    -ss <start time, put before input to seek by keyframes> 

    -to <end time> 

    -i <input> 

    -filter_complex 

        split=2[in1][in2];[in1]<some filter>,metadata=add:key=mykey:value=mytag1[out1];[in2]<some other filter>,metadata=add:key=mykey:value=mytag2[out2] 

    -map [out1] -metadata title=<tag1> -codec png -f image2pipe pipe:1 

    -map [out2] -metadata title=<tag2> -codec png -f image2pipe pipe:1

share|improve this question

edited 4 hours ago

casperOne

asked 23 hours ago

casperOnecasperOne

116118

share|improve this question

edited 4 hours ago

casperOne

asked 23 hours ago

casperOnecasperOne

116118

asked 23 hours ago

casperOnecasperOne

116118

asked 23 hours ago

casperOnecasperOne

116118

1 Answer
1

active

oldest

votes

0

You can interleave them

ffmpeg 

    -i <input> 

    -filter_complex 

        setpts=N/25/TB,split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2]; 

       [out1][out2]interleave[out] 

    -map [out] -r 25 -codec png -f image2pipe pipe:1

This will have one frame of out1 followed by out2 then out1...etc

share|improve this answer

edited 8 hours ago

answered 19 hours ago

GyanGyan

15.4k21846

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for this! I ran the command, but I seem to get the first frame repeated (across the streams) ad-infinitum. I suspect this part of the documentation is critical: Input streams must have well defined, monotonically increasing frame timestamp values. I am downloading this from a URL served up via HTTPS, as well as with an input time to seek to, so not sure if this is playing a part or not. Would welcome any suggestions. I've updated the question appropriately to reflect this.
  
  – casperOne
  9 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What are the filters you're applying.
  
  – Gyan
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  crop, scale, crop (again), and possibly hflip.
  
  – casperOne
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Edited command.
  
  – Gyan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  FFmpeg png encoder currently does not support tEXt chunk.
  
  – Paul B. Mahol
  6 hours ago
  

  
  
  
  

 | 
show 3 more comments

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0

You can interleave them

ffmpeg 

    -i <input> 

    -filter_complex 

        setpts=N/25/TB,split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2]; 

       [out1][out2]interleave[out] 

    -map [out] -r 25 -codec png -f image2pipe pipe:1

This will have one frame of out1 followed by out2 then out1...etc

share|improve this answer

edited 8 hours ago

answered 19 hours ago

GyanGyan

15.4k21846

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for this! I ran the command, but I seem to get the first frame repeated (across the streams) ad-infinitum. I suspect this part of the documentation is critical: Input streams must have well defined, monotonically increasing frame timestamp values. I am downloading this from a URL served up via HTTPS, as well as with an input time to seek to, so not sure if this is playing a part or not. Would welcome any suggestions. I've updated the question appropriately to reflect this.
  
  – casperOne
  9 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What are the filters you're applying.
  
  – Gyan
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  crop, scale, crop (again), and possibly hflip.
  
  – casperOne
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Edited command.
  
  – Gyan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  FFmpeg png encoder currently does not support tEXt chunk.
  
  – Paul B. Mahol
  6 hours ago
  

  
  
  
  

 | 
show 3 more comments

0

You can interleave them

ffmpeg 

    -i <input> 

    -filter_complex 

        setpts=N/25/TB,split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2]; 

       [out1][out2]interleave[out] 

    -map [out] -r 25 -codec png -f image2pipe pipe:1

This will have one frame of out1 followed by out2 then out1...etc

share|improve this answer

edited 8 hours ago

answered 19 hours ago

GyanGyan

15.4k21846

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for this! I ran the command, but I seem to get the first frame repeated (across the streams) ad-infinitum. I suspect this part of the documentation is critical: Input streams must have well defined, monotonically increasing frame timestamp values. I am downloading this from a URL served up via HTTPS, as well as with an input time to seek to, so not sure if this is playing a part or not. Would welcome any suggestions. I've updated the question appropriately to reflect this.
  
  – casperOne
  9 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What are the filters you're applying.
  
  – Gyan
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  crop, scale, crop (again), and possibly hflip.
  
  – casperOne
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Edited command.
  
  – Gyan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  FFmpeg png encoder currently does not support tEXt chunk.
  
  – Paul B. Mahol
  6 hours ago
  

  
  
  
  

 | 
show 3 more comments

You can interleave them

ffmpeg 

    -i <input> 

    -filter_complex 

        setpts=N/25/TB,split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2]; 

       [out1][out2]interleave[out] 

    -map [out] -r 25 -codec png -f image2pipe pipe:1

This will have one frame of out1 followed by out2 then out1...etc

share|improve this answer

edited 8 hours ago

answered 19 hours ago

GyanGyan

15.4k21846

ffmpeg 

    -i <input> 

    -filter_complex 

        setpts=N/25/TB,split=2[in1][in2];[in1]<some filter>[out1];[in2]<some other filter>[out2]; 

       [out1][out2]interleave[out] 

    -map [out] -r 25 -codec png -f image2pipe pipe:1

share|improve this answer

edited 8 hours ago

answered 19 hours ago

GyanGyan

15.4k21846

answered 19 hours ago

GyanGyan

15.4k21846

answered 19 hours ago

GyanGyan

15.4k21846