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Google VP9 ffmpeg examples error

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0

On the Google developer vp9 documentation here, the recommended command ffmpeg command lines seem to be incorrectly formed.

It seems to me that the command such as this

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 tos-320x240.webm && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 -y tos-320x240.webm

should actually be more along the lines of

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 -y /dev/null && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 tos-320x240.webm

This is based on ffmpeg documentation here

However quoting the Google documentation page

'Note that the first-pass and second-pass commands are chained together. The -y argument in the second-pass command answers "Yes" when FFMpeg asks to overwrite the first-pass statistics file with the output video.'

Based on my understanding of two pass in ffmpeg, the "statistics" file will be by default in ffmpeg2pass-0.log and the actual output file is useless.

Is the libvpx-vp9 encoder using the two pass settings differently than is standard in ffmpeg? Or is Google developers page just wrong?

ffmpeg vp9

share

asked 5 mins ago

MR1865MR1865

11

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MR1865 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

On the Google developer vp9 documentation here, the recommended command ffmpeg command lines seem to be incorrectly formed.

It seems to me that the command such as this

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 tos-320x240.webm && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 -y tos-320x240.webm

should actually be more along the lines of

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 -y /dev/null && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 tos-320x240.webm

This is based on ffmpeg documentation here

However quoting the Google documentation page

'Note that the first-pass and second-pass commands are chained together. The -y argument in the second-pass command answers "Yes" when FFMpeg asks to overwrite the first-pass statistics file with the output video.'

Based on my understanding of two pass in ffmpeg, the "statistics" file will be by default in ffmpeg2pass-0.log and the actual output file is useless.

Is the libvpx-vp9 encoder using the two pass settings differently than is standard in ffmpeg? Or is Google developers page just wrong?

ffmpeg vp9

share

asked 5 mins ago

MR1865MR1865

11

New contributor

MR1865 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

On the Google developer vp9 documentation here, the recommended command ffmpeg command lines seem to be incorrectly formed.

It seems to me that the command such as this

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 tos-320x240.webm && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 -y tos-320x240.webm

should actually be more along the lines of

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 -y /dev/null && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 tos-320x240.webm

This is based on ffmpeg documentation here

However quoting the Google documentation page

'Note that the first-pass and second-pass commands are chained together. The -y argument in the second-pass command answers "Yes" when FFMpeg asks to overwrite the first-pass statistics file with the output video.'

Based on my understanding of two pass in ffmpeg, the "statistics" file will be by default in ffmpeg2pass-0.log and the actual output file is useless.

Is the libvpx-vp9 encoder using the two pass settings differently than is standard in ffmpeg? Or is Google developers page just wrong?

ffmpeg vp9

share

asked 5 mins ago

MR1865MR1865

11

New contributor

MR1865 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 tos-320x240.webm && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 -y tos-320x240.webm

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 1 -speed 4 -y /dev/null && 

ffmpeg -i tears_of_steel_1080p.webm -vf scale=320x240 -b:v 150k 

  -minrate 75k -maxrate 218k -tile-columns 0 -g 240 -threads 2 

  -quality good -crf 37 -c:v libvpx-vp9 -c:a libopus 

  -pass 2 -speed 1 tos-320x240.webm

share

asked 5 mins ago

MR1865MR1865

11

New contributor

MR1865 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share

asked 5 mins ago

MR1865MR1865

11

New contributor

MR1865 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 5 mins ago

MR1865MR1865

11

New contributor

MR1865 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 5 mins ago

MR1865MR1865

11