Mixing
FFMPEG : Obtain the system time corresponding to each frame present in a video
I am currently recording the screen using the below command on Windows 10 system,
ffmpeg.exe -loglevel quiet -f gdigrab -framerate 30 -i desktop -vf mpdecimate,setpts=N/FRAME_RATE/TB -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 0 -threads 0 nodups.mkv
If I record a video for 5 mins, where 4 minutes out of it is idle. The final video obtained is only 1 minute. I want to know the system time corresponding to a specific frame from this 1 minute video.
I tried making use of the command to obtain the frame information from this 1 minute video for 40th frame like : ffmpeg -i nodups.mkv -vf select='eq(n,40)',showinfo -f null -
This outputs me
[Parsed_showinfo_1 @ 000002455fce5dc0] n: 0 pts: 1333 pts_time:1.333 pos: 158601 fmt:yuv420p sar:0/1 s:1600x900 i:P iskey:0 type:P checksum:885ECCE2 plane_checksum:[7D89AD8E DC745BDC 0E23C369] mean:[158 128 128] stdev:[101.7 4.5 4.0
Is there a way to obtain the system time when this frame was captured using FFMPEG ? Any inputs will help.
video ffmpeg duplicates timestamp video-capture
asked Nov 20 '18 at 10:38
UserUser
236
add a comment |
I am currently recording the screen using the below command on Windows 10 system,
ffmpeg.exe -loglevel quiet -f gdigrab -framerate 30 -i desktop -vf mpdecimate,setpts=N/FRAME_RATE/TB -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 0 -threads 0 nodups.mkv
If I record a video for 5 mins, where 4 minutes out of it is idle. The final video obtained is only 1 minute. I want to know the system time corresponding to a specific frame from this 1 minute video.
I tried making use of the command to obtain the frame information from this 1 minute video for 40th frame like : ffmpeg -i nodups.mkv -vf select='eq(n,40)',showinfo -f null -
This outputs me
[Parsed_showinfo_1 @ 000002455fce5dc0] n: 0 pts: 1333 pts_time:1.333 pos: 158601 fmt:yuv420p sar:0/1 s:1600x900 i:P iskey:0 type:P checksum:885ECCE2 plane_checksum:[7D89AD8E DC745BDC 0E23C369] mean:[158 128 128] stdev:[101.7 4.5 4.0
Is there a way to obtain the system time when this frame was captured using FFMPEG ? Any inputs will help.
video ffmpeg duplicates timestamp video-capture
asked Nov 20 '18 at 10:38
UserUser
236
add a comment |
I am currently recording the screen using the below command on Windows 10 system,
ffmpeg.exe -loglevel quiet -f gdigrab -framerate 30 -i desktop -vf mpdecimate,setpts=N/FRAME_RATE/TB -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 0 -threads 0 nodups.mkv
If I record a video for 5 mins, where 4 minutes out of it is idle. The final video obtained is only 1 minute. I want to know the system time corresponding to a specific frame from this 1 minute video.
I tried making use of the command to obtain the frame information from this 1 minute video for 40th frame like : ffmpeg -i nodups.mkv -vf select='eq(n,40)',showinfo -f null -
This outputs me
[Parsed_showinfo_1 @ 000002455fce5dc0] n: 0 pts: 1333 pts_time:1.333 pos: 158601 fmt:yuv420p sar:0/1 s:1600x900 i:P iskey:0 type:P checksum:885ECCE2 plane_checksum:[7D89AD8E DC745BDC 0E23C369] mean:[158 128 128] stdev:[101.7 4.5 4.0
Is there a way to obtain the system time when this frame was captured using FFMPEG ? Any inputs will help.
video ffmpeg duplicates timestamp video-capture
asked Nov 20 '18 at 10:38
UserUser
236
I am currently recording the screen using the below command on Windows 10 system,
ffmpeg.exe -loglevel quiet -f gdigrab -framerate 30 -i desktop -vf mpdecimate,setpts=N/FRAME_RATE/TB -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 0 -threads 0 nodups.mkv
If I record a video for 5 mins, where 4 minutes out of it is idle. The final video obtained is only 1 minute. I want to know the system time corresponding to a specific frame from this 1 minute video.
I tried making use of the command to obtain the frame information from this 1 minute video for 40th frame like : ffmpeg -i nodups.mkv -vf select='eq(n,40)',showinfo -f null -
This outputs me
[Parsed_showinfo_1 @ 000002455fce5dc0] n: 0 pts: 1333 pts_time:1.333 pos: 158601 fmt:yuv420p sar:0/1 s:1600x900 i:P iskey:0 type:P checksum:885ECCE2 plane_checksum:[7D89AD8E DC745BDC 0E23C369] mean:[158 128 128] stdev:[101.7 4.5 4.0
Is there a way to obtain the system time when this frame was captured using FFMPEG ? Any inputs will help.
video ffmpeg duplicates timestamp video-capture
video ffmpeg duplicates timestamp video-capture
asked Nov 20 '18 at 10:38
UserUser
236
asked Nov 20 '18 at 10:38
UserUser
236
edited Nov 20 '18 at 11:04
User
asked Nov 20 '18 at 10:38
UserUser
236
asked Nov 20 '18 at 10:38
UserUser
236
asked Nov 20 '18 at 10:38
UserUser
236
236
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Use
ffmpeg.exe -f gdigrab -framerate 30 -i desktop -filter_complex settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/FRAME_RATE/TB[out] -map [out] -vcodec libx264 -pix_fmt yuv420p -preset fast -crf 0 -threads 0 nodups.mkv -map [ts] -f mkvtimestamp_v2 nodups.txt -vsync 0
FFmpeg supports a data format called mkvtimestamp_v2 which stores timestamps as text in millisecond precision. So, in the command above, the input timestamps are first converted to millisecond precision with settb, then setpts is used to assign the wallclock time to each frame. But because the text format has a limited precision, we need to reduce the timestamp. That's done by subtracting 15e11. The after the mpdecimate, we split the result, sending one copy for encoding and one for metadata output.
nodups.txt will look like this
# timecode format v2
42721944800
42721944867
42721944933
42721945200
...
For frame no. X, select the Xth entry, add 15e11 (1500000000000) and then convert to a human timestamp from e.g. https://www.epochconverter.com/
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53391150%2fffmpeg-obtain-the-system-time-corresponding-to-each-frame-present-in-a-video%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use
ffmpeg.exe -f gdigrab -framerate 30 -i desktop -filter_complex settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/FRAME_RATE/TB[out] -map [out] -vcodec libx264 -pix_fmt yuv420p -preset fast -crf 0 -threads 0 nodups.mkv -map [ts] -f mkvtimestamp_v2 nodups.txt -vsync 0
FFmpeg supports a data format called mkvtimestamp_v2 which stores timestamps as text in millisecond precision. So, in the command above, the input timestamps are first converted to millisecond precision with settb, then setpts is used to assign the wallclock time to each frame. But because the text format has a limited precision, we need to reduce the timestamp. That's done by subtracting 15e11. The after the mpdecimate, we split the result, sending one copy for encoding and one for metadata output.
nodups.txt will look like this
# timecode format v2
42721944800
42721944867
42721944933
42721945200
...
For frame no. X, select the Xth entry, add 15e11 (1500000000000) and then convert to a human timestamp from e.g. https://www.epochconverter.com/
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
add a comment |
Use
ffmpeg.exe -f gdigrab -framerate 30 -i desktop -filter_complex settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/FRAME_RATE/TB[out] -map [out] -vcodec libx264 -pix_fmt yuv420p -preset fast -crf 0 -threads 0 nodups.mkv -map [ts] -f mkvtimestamp_v2 nodups.txt -vsync 0
FFmpeg supports a data format called mkvtimestamp_v2 which stores timestamps as text in millisecond precision. So, in the command above, the input timestamps are first converted to millisecond precision with settb, then setpts is used to assign the wallclock time to each frame. But because the text format has a limited precision, we need to reduce the timestamp. That's done by subtracting 15e11. The after the mpdecimate, we split the result, sending one copy for encoding and one for metadata output.
nodups.txt will look like this
# timecode format v2
42721944800
42721944867
42721944933
42721945200
...
For frame no. X, select the Xth entry, add 15e11 (1500000000000) and then convert to a human timestamp from e.g. https://www.epochconverter.com/
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
add a comment |
Use
ffmpeg.exe -f gdigrab -framerate 30 -i desktop -filter_complex settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/FRAME_RATE/TB[out] -map [out] -vcodec libx264 -pix_fmt yuv420p -preset fast -crf 0 -threads 0 nodups.mkv -map [ts] -f mkvtimestamp_v2 nodups.txt -vsync 0
FFmpeg supports a data format called mkvtimestamp_v2 which stores timestamps as text in millisecond precision. So, in the command above, the input timestamps are first converted to millisecond precision with settb, then setpts is used to assign the wallclock time to each frame. But because the text format has a limited precision, we need to reduce the timestamp. That's done by subtracting 15e11. The after the mpdecimate, we split the result, sending one copy for encoding and one for metadata output.
nodups.txt will look like this
# timecode format v2
42721944800
42721944867
42721944933
42721945200
...
For frame no. X, select the Xth entry, add 15e11 (1500000000000) and then convert to a human timestamp from e.g. https://www.epochconverter.com/
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
Use
ffmpeg.exe -f gdigrab -framerate 30 -i desktop -filter_complex settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/FRAME_RATE/TB[out] -map [out] -vcodec libx264 -pix_fmt yuv420p -preset fast -crf 0 -threads 0 nodups.mkv -map [ts] -f mkvtimestamp_v2 nodups.txt -vsync 0
FFmpeg supports a data format called mkvtimestamp_v2 which stores timestamps as text in millisecond precision. So, in the command above, the input timestamps are first converted to millisecond precision with settb, then setpts is used to assign the wallclock time to each frame. But because the text format has a limited precision, we need to reduce the timestamp. That's done by subtracting 15e11. The after the mpdecimate, we split the result, sending one copy for encoding and one for metadata output.
nodups.txt will look like this
# timecode format v2
42721944800
42721944867
42721944933
42721945200
...
For frame no. X, select the Xth entry, add 15e11 (1500000000000) and then convert to a human timestamp from e.g. https://www.epochconverter.com/
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
answered Nov 20 '18 at 14:00
GyanGyan
31.5k22668
31.5k22668
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53391150%2fffmpeg-obtain-the-system-time-corresponding-to-each-frame-present-in-a-video%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
