Correct aspect ratio without re-encoding video file
up vote
8
down vote
favorite
I have a video stream with the following properties:
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x416 [SAR 1:1 DAR 45:26], 1908 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
When I run it in VLC, I have to press "A" to change aspect ratio to "4:3" to make the video show with the correct aspect ratio.
Looking at the video facts, Is the error that a) the actual video has been incorrectly stretched in the pixel data, or b) there is simply some metadata value that has been incorrectly set?
If the former, I know I can re-encode the video and change the width and height. But if the latter, what ffmpeg command to I run to fix the metadata without re-encoding the video itself?
ffmpeg
add a comment |
up vote
8
down vote
favorite
I have a video stream with the following properties:
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x416 [SAR 1:1 DAR 45:26], 1908 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
When I run it in VLC, I have to press "A" to change aspect ratio to "4:3" to make the video show with the correct aspect ratio.
Looking at the video facts, Is the error that a) the actual video has been incorrectly stretched in the pixel data, or b) there is simply some metadata value that has been incorrectly set?
If the former, I know I can re-encode the video and change the width and height. But if the latter, what ffmpeg command to I run to fix the metadata without re-encoding the video itself?
ffmpeg
add a comment |
up vote
8
down vote
favorite
up vote
8
down vote
favorite
I have a video stream with the following properties:
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x416 [SAR 1:1 DAR 45:26], 1908 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
When I run it in VLC, I have to press "A" to change aspect ratio to "4:3" to make the video show with the correct aspect ratio.
Looking at the video facts, Is the error that a) the actual video has been incorrectly stretched in the pixel data, or b) there is simply some metadata value that has been incorrectly set?
If the former, I know I can re-encode the video and change the width and height. But if the latter, what ffmpeg command to I run to fix the metadata without re-encoding the video itself?
ffmpeg
I have a video stream with the following properties:
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x416 [SAR 1:1 DAR 45:26], 1908 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
When I run it in VLC, I have to press "A" to change aspect ratio to "4:3" to make the video show with the correct aspect ratio.
Looking at the video facts, Is the error that a) the actual video has been incorrectly stretched in the pixel data, or b) there is simply some metadata value that has been incorrectly set?
If the former, I know I can re-encode the video and change the width and height. But if the latter, what ffmpeg command to I run to fix the metadata without re-encoding the video itself?
ffmpeg
ffmpeg
asked Apr 30 '15 at 6:24
forthrin
50831024
50831024
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
up vote
22
down vote
accepted
There is a difference between Sample Aspect Ratio (SAR) and Display Aspect Ratio (DAR). If you want to change the video to display at 4:3, you will either need to change the actual pixels in the image (by scaling the pixels and changing SAR), or by setting a metadata flag that at the container level that tells external media players to stretch the image to your desired DAR.
You will not be able to scale the pixels and change SAR without applying a video filter. If you choose this method, you will be required to transcode the file - since you cannot "stream copy" the video stream while applying a video filter.
To scale the image and change SAR (while transcoding), try:
ffmpeg -i <INPUT_FILE> -vf scale=720:540 -c:v <Video_Codec> <OUTPUT_FILE>
On the other hand, if you just want to change the metadata flag and adjust the DAR, you will be able to stream copy the video. to do this, try:
ffmpeg -i [INPUT] -aspect 720:540 -c copy [OUPTPUT]
Excellent! Changing the aspect worked straight away!
– forthrin
Apr 30 '15 at 18:04
1
You can't use-c copy
and scale at the same time; however you can use-aspect
to change the aspect ratio at the container level (but not the stream level).
– LordNeckbeard
Apr 30 '15 at 18:56
@LordNeckbeard, using-aspect
does work for playback inffplay
, but not in WMP or MPC-HC. It adds an additional SAR/DAR item to theStream #…
info line inFFmpeg/probe/play
but doesn't seem to be solution for general playback. Stretching the video with the window seems like the easiest solution for MPC-HC playback.
– Lumi
Jan 3 '16 at 14:10
didn't work for me for MPEG2 without reencoding
– Mikhail V
Jul 1 '16 at 11:33
I don't know why it didn't work for me. It just outputs the same video!
– Tina J
Jul 22 '16 at 1:02
|
show 2 more comments
up vote
2
down vote
ffmpeg can't change parameters of a video stream without re-encoding, MP4Box (part of gpac) and mkvmerge can. In case of one video stream and a real/correct aspect ratio of 4:3, you may want to try:
MP4Box -par 1=3:4 VideoFile.mp4
"-par" : PixelAspectRatio (adjusts DAR + SAR with respect to the video resolution)
"1"= : stream number
"3:4" : aspect ratio (lower number 1st!)
Changes are directly applied to "VideoFile.mp4", no copy
To verify before and after: ffmpeg -i VideoFile.mp4
add a comment |
up vote
1
down vote
Delgado's answer is correct that MP4Box can do this, but the -par
option doesn't work quite as described. With an -out
parameter (so as not to disturb your original file):
mp4box source.mp4 -out target.mp4 -par stream-number=width:height
When you use -par stream-number=width:height
, you define the pixel aspect ratio – that is, the result of dividing the device aspect ratio by the storage aspect ratio. (Equivalently, you're describing the aspect ratio of a source pixel.) For example, suppose you have a DVD source that's 720×480, and the correct display aspect ratio is 4:3. For this case, you need:
mp4box source.mp4 -out target.mp4 -par 1=8:9
because (4/3) / (720/480) = 8/9.
If the source represents true SD NTSC pixels (in which case only the central 704×480 pixels are supposed to map to a 4×3 screen, with 8 pixels overscan on either side), the correct command would be:
mp4box source.mp4 -out target.mp4 -par 1=10:11
because (4/3) / (704/480) = 10/11 – exactly the reference pixel aspect ratio for standard definition NTSC video.
For the case given in the question, if it's really 4:3, that gives a very odd pixel aspect ratio: (4/3)/(720/416) = 104/135. It's 720 wide, which suggests a DVD source; it's a 25 fps video, suggesting PAL, but the PAR works out to less than 1, suggesting NTSC. It could be 4:5, I suppose (very close to 104:135), but I don't know of anything that produces that pixel aspect ratio; maybe try that first, and then try 3:4 if it still looks a little too stretched horizontally. If you're certain it's exactly 4:3, of course, just use 104:135.
add a comment |
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
22
down vote
accepted
There is a difference between Sample Aspect Ratio (SAR) and Display Aspect Ratio (DAR). If you want to change the video to display at 4:3, you will either need to change the actual pixels in the image (by scaling the pixels and changing SAR), or by setting a metadata flag that at the container level that tells external media players to stretch the image to your desired DAR.
You will not be able to scale the pixels and change SAR without applying a video filter. If you choose this method, you will be required to transcode the file - since you cannot "stream copy" the video stream while applying a video filter.
To scale the image and change SAR (while transcoding), try:
ffmpeg -i <INPUT_FILE> -vf scale=720:540 -c:v <Video_Codec> <OUTPUT_FILE>
On the other hand, if you just want to change the metadata flag and adjust the DAR, you will be able to stream copy the video. to do this, try:
ffmpeg -i [INPUT] -aspect 720:540 -c copy [OUPTPUT]
Excellent! Changing the aspect worked straight away!
– forthrin
Apr 30 '15 at 18:04
1
You can't use-c copy
and scale at the same time; however you can use-aspect
to change the aspect ratio at the container level (but not the stream level).
– LordNeckbeard
Apr 30 '15 at 18:56
@LordNeckbeard, using-aspect
does work for playback inffplay
, but not in WMP or MPC-HC. It adds an additional SAR/DAR item to theStream #…
info line inFFmpeg/probe/play
but doesn't seem to be solution for general playback. Stretching the video with the window seems like the easiest solution for MPC-HC playback.
– Lumi
Jan 3 '16 at 14:10
didn't work for me for MPEG2 without reencoding
– Mikhail V
Jul 1 '16 at 11:33
I don't know why it didn't work for me. It just outputs the same video!
– Tina J
Jul 22 '16 at 1:02
|
show 2 more comments
up vote
22
down vote
accepted
There is a difference between Sample Aspect Ratio (SAR) and Display Aspect Ratio (DAR). If you want to change the video to display at 4:3, you will either need to change the actual pixels in the image (by scaling the pixels and changing SAR), or by setting a metadata flag that at the container level that tells external media players to stretch the image to your desired DAR.
You will not be able to scale the pixels and change SAR without applying a video filter. If you choose this method, you will be required to transcode the file - since you cannot "stream copy" the video stream while applying a video filter.
To scale the image and change SAR (while transcoding), try:
ffmpeg -i <INPUT_FILE> -vf scale=720:540 -c:v <Video_Codec> <OUTPUT_FILE>
On the other hand, if you just want to change the metadata flag and adjust the DAR, you will be able to stream copy the video. to do this, try:
ffmpeg -i [INPUT] -aspect 720:540 -c copy [OUPTPUT]
Excellent! Changing the aspect worked straight away!
– forthrin
Apr 30 '15 at 18:04
1
You can't use-c copy
and scale at the same time; however you can use-aspect
to change the aspect ratio at the container level (but not the stream level).
– LordNeckbeard
Apr 30 '15 at 18:56
@LordNeckbeard, using-aspect
does work for playback inffplay
, but not in WMP or MPC-HC. It adds an additional SAR/DAR item to theStream #…
info line inFFmpeg/probe/play
but doesn't seem to be solution for general playback. Stretching the video with the window seems like the easiest solution for MPC-HC playback.
– Lumi
Jan 3 '16 at 14:10
didn't work for me for MPEG2 without reencoding
– Mikhail V
Jul 1 '16 at 11:33
I don't know why it didn't work for me. It just outputs the same video!
– Tina J
Jul 22 '16 at 1:02
|
show 2 more comments
up vote
22
down vote
accepted
up vote
22
down vote
accepted
There is a difference between Sample Aspect Ratio (SAR) and Display Aspect Ratio (DAR). If you want to change the video to display at 4:3, you will either need to change the actual pixels in the image (by scaling the pixels and changing SAR), or by setting a metadata flag that at the container level that tells external media players to stretch the image to your desired DAR.
You will not be able to scale the pixels and change SAR without applying a video filter. If you choose this method, you will be required to transcode the file - since you cannot "stream copy" the video stream while applying a video filter.
To scale the image and change SAR (while transcoding), try:
ffmpeg -i <INPUT_FILE> -vf scale=720:540 -c:v <Video_Codec> <OUTPUT_FILE>
On the other hand, if you just want to change the metadata flag and adjust the DAR, you will be able to stream copy the video. to do this, try:
ffmpeg -i [INPUT] -aspect 720:540 -c copy [OUPTPUT]
There is a difference between Sample Aspect Ratio (SAR) and Display Aspect Ratio (DAR). If you want to change the video to display at 4:3, you will either need to change the actual pixels in the image (by scaling the pixels and changing SAR), or by setting a metadata flag that at the container level that tells external media players to stretch the image to your desired DAR.
You will not be able to scale the pixels and change SAR without applying a video filter. If you choose this method, you will be required to transcode the file - since you cannot "stream copy" the video stream while applying a video filter.
To scale the image and change SAR (while transcoding), try:
ffmpeg -i <INPUT_FILE> -vf scale=720:540 -c:v <Video_Codec> <OUTPUT_FILE>
On the other hand, if you just want to change the metadata flag and adjust the DAR, you will be able to stream copy the video. to do this, try:
ffmpeg -i [INPUT] -aspect 720:540 -c copy [OUPTPUT]
edited May 9 '17 at 22:44
answered Apr 30 '15 at 18:00
occvtech
6001413
6001413
Excellent! Changing the aspect worked straight away!
– forthrin
Apr 30 '15 at 18:04
1
You can't use-c copy
and scale at the same time; however you can use-aspect
to change the aspect ratio at the container level (but not the stream level).
– LordNeckbeard
Apr 30 '15 at 18:56
@LordNeckbeard, using-aspect
does work for playback inffplay
, but not in WMP or MPC-HC. It adds an additional SAR/DAR item to theStream #…
info line inFFmpeg/probe/play
but doesn't seem to be solution for general playback. Stretching the video with the window seems like the easiest solution for MPC-HC playback.
– Lumi
Jan 3 '16 at 14:10
didn't work for me for MPEG2 without reencoding
– Mikhail V
Jul 1 '16 at 11:33
I don't know why it didn't work for me. It just outputs the same video!
– Tina J
Jul 22 '16 at 1:02
|
show 2 more comments
Excellent! Changing the aspect worked straight away!
– forthrin
Apr 30 '15 at 18:04
1
You can't use-c copy
and scale at the same time; however you can use-aspect
to change the aspect ratio at the container level (but not the stream level).
– LordNeckbeard
Apr 30 '15 at 18:56
@LordNeckbeard, using-aspect
does work for playback inffplay
, but not in WMP or MPC-HC. It adds an additional SAR/DAR item to theStream #…
info line inFFmpeg/probe/play
but doesn't seem to be solution for general playback. Stretching the video with the window seems like the easiest solution for MPC-HC playback.
– Lumi
Jan 3 '16 at 14:10
didn't work for me for MPEG2 without reencoding
– Mikhail V
Jul 1 '16 at 11:33
I don't know why it didn't work for me. It just outputs the same video!
– Tina J
Jul 22 '16 at 1:02
Excellent! Changing the aspect worked straight away!
– forthrin
Apr 30 '15 at 18:04
Excellent! Changing the aspect worked straight away!
– forthrin
Apr 30 '15 at 18:04
1
1
You can't use
-c copy
and scale at the same time; however you can use -aspect
to change the aspect ratio at the container level (but not the stream level).– LordNeckbeard
Apr 30 '15 at 18:56
You can't use
-c copy
and scale at the same time; however you can use -aspect
to change the aspect ratio at the container level (but not the stream level).– LordNeckbeard
Apr 30 '15 at 18:56
@LordNeckbeard, using
-aspect
does work for playback in ffplay
, but not in WMP or MPC-HC. It adds an additional SAR/DAR item to the Stream #…
info line in FFmpeg/probe/play
but doesn't seem to be solution for general playback. Stretching the video with the window seems like the easiest solution for MPC-HC playback.– Lumi
Jan 3 '16 at 14:10
@LordNeckbeard, using
-aspect
does work for playback in ffplay
, but not in WMP or MPC-HC. It adds an additional SAR/DAR item to the Stream #…
info line in FFmpeg/probe/play
but doesn't seem to be solution for general playback. Stretching the video with the window seems like the easiest solution for MPC-HC playback.– Lumi
Jan 3 '16 at 14:10
didn't work for me for MPEG2 without reencoding
– Mikhail V
Jul 1 '16 at 11:33
didn't work for me for MPEG2 without reencoding
– Mikhail V
Jul 1 '16 at 11:33
I don't know why it didn't work for me. It just outputs the same video!
– Tina J
Jul 22 '16 at 1:02
I don't know why it didn't work for me. It just outputs the same video!
– Tina J
Jul 22 '16 at 1:02
|
show 2 more comments
up vote
2
down vote
ffmpeg can't change parameters of a video stream without re-encoding, MP4Box (part of gpac) and mkvmerge can. In case of one video stream and a real/correct aspect ratio of 4:3, you may want to try:
MP4Box -par 1=3:4 VideoFile.mp4
"-par" : PixelAspectRatio (adjusts DAR + SAR with respect to the video resolution)
"1"= : stream number
"3:4" : aspect ratio (lower number 1st!)
Changes are directly applied to "VideoFile.mp4", no copy
To verify before and after: ffmpeg -i VideoFile.mp4
add a comment |
up vote
2
down vote
ffmpeg can't change parameters of a video stream without re-encoding, MP4Box (part of gpac) and mkvmerge can. In case of one video stream and a real/correct aspect ratio of 4:3, you may want to try:
MP4Box -par 1=3:4 VideoFile.mp4
"-par" : PixelAspectRatio (adjusts DAR + SAR with respect to the video resolution)
"1"= : stream number
"3:4" : aspect ratio (lower number 1st!)
Changes are directly applied to "VideoFile.mp4", no copy
To verify before and after: ffmpeg -i VideoFile.mp4
add a comment |
up vote
2
down vote
up vote
2
down vote
ffmpeg can't change parameters of a video stream without re-encoding, MP4Box (part of gpac) and mkvmerge can. In case of one video stream and a real/correct aspect ratio of 4:3, you may want to try:
MP4Box -par 1=3:4 VideoFile.mp4
"-par" : PixelAspectRatio (adjusts DAR + SAR with respect to the video resolution)
"1"= : stream number
"3:4" : aspect ratio (lower number 1st!)
Changes are directly applied to "VideoFile.mp4", no copy
To verify before and after: ffmpeg -i VideoFile.mp4
ffmpeg can't change parameters of a video stream without re-encoding, MP4Box (part of gpac) and mkvmerge can. In case of one video stream and a real/correct aspect ratio of 4:3, you may want to try:
MP4Box -par 1=3:4 VideoFile.mp4
"-par" : PixelAspectRatio (adjusts DAR + SAR with respect to the video resolution)
"1"= : stream number
"3:4" : aspect ratio (lower number 1st!)
Changes are directly applied to "VideoFile.mp4", no copy
To verify before and after: ffmpeg -i VideoFile.mp4
edited Jun 18 at 10:16
Majenko
27k34472
27k34472
answered Feb 1 at 0:12
Delgado
291
291
add a comment |
add a comment |
up vote
1
down vote
Delgado's answer is correct that MP4Box can do this, but the -par
option doesn't work quite as described. With an -out
parameter (so as not to disturb your original file):
mp4box source.mp4 -out target.mp4 -par stream-number=width:height
When you use -par stream-number=width:height
, you define the pixel aspect ratio – that is, the result of dividing the device aspect ratio by the storage aspect ratio. (Equivalently, you're describing the aspect ratio of a source pixel.) For example, suppose you have a DVD source that's 720×480, and the correct display aspect ratio is 4:3. For this case, you need:
mp4box source.mp4 -out target.mp4 -par 1=8:9
because (4/3) / (720/480) = 8/9.
If the source represents true SD NTSC pixels (in which case only the central 704×480 pixels are supposed to map to a 4×3 screen, with 8 pixels overscan on either side), the correct command would be:
mp4box source.mp4 -out target.mp4 -par 1=10:11
because (4/3) / (704/480) = 10/11 – exactly the reference pixel aspect ratio for standard definition NTSC video.
For the case given in the question, if it's really 4:3, that gives a very odd pixel aspect ratio: (4/3)/(720/416) = 104/135. It's 720 wide, which suggests a DVD source; it's a 25 fps video, suggesting PAL, but the PAR works out to less than 1, suggesting NTSC. It could be 4:5, I suppose (very close to 104:135), but I don't know of anything that produces that pixel aspect ratio; maybe try that first, and then try 3:4 if it still looks a little too stretched horizontally. If you're certain it's exactly 4:3, of course, just use 104:135.
add a comment |
up vote
1
down vote
Delgado's answer is correct that MP4Box can do this, but the -par
option doesn't work quite as described. With an -out
parameter (so as not to disturb your original file):
mp4box source.mp4 -out target.mp4 -par stream-number=width:height
When you use -par stream-number=width:height
, you define the pixel aspect ratio – that is, the result of dividing the device aspect ratio by the storage aspect ratio. (Equivalently, you're describing the aspect ratio of a source pixel.) For example, suppose you have a DVD source that's 720×480, and the correct display aspect ratio is 4:3. For this case, you need:
mp4box source.mp4 -out target.mp4 -par 1=8:9
because (4/3) / (720/480) = 8/9.
If the source represents true SD NTSC pixels (in which case only the central 704×480 pixels are supposed to map to a 4×3 screen, with 8 pixels overscan on either side), the correct command would be:
mp4box source.mp4 -out target.mp4 -par 1=10:11
because (4/3) / (704/480) = 10/11 – exactly the reference pixel aspect ratio for standard definition NTSC video.
For the case given in the question, if it's really 4:3, that gives a very odd pixel aspect ratio: (4/3)/(720/416) = 104/135. It's 720 wide, which suggests a DVD source; it's a 25 fps video, suggesting PAL, but the PAR works out to less than 1, suggesting NTSC. It could be 4:5, I suppose (very close to 104:135), but I don't know of anything that produces that pixel aspect ratio; maybe try that first, and then try 3:4 if it still looks a little too stretched horizontally. If you're certain it's exactly 4:3, of course, just use 104:135.
add a comment |
up vote
1
down vote
up vote
1
down vote
Delgado's answer is correct that MP4Box can do this, but the -par
option doesn't work quite as described. With an -out
parameter (so as not to disturb your original file):
mp4box source.mp4 -out target.mp4 -par stream-number=width:height
When you use -par stream-number=width:height
, you define the pixel aspect ratio – that is, the result of dividing the device aspect ratio by the storage aspect ratio. (Equivalently, you're describing the aspect ratio of a source pixel.) For example, suppose you have a DVD source that's 720×480, and the correct display aspect ratio is 4:3. For this case, you need:
mp4box source.mp4 -out target.mp4 -par 1=8:9
because (4/3) / (720/480) = 8/9.
If the source represents true SD NTSC pixels (in which case only the central 704×480 pixels are supposed to map to a 4×3 screen, with 8 pixels overscan on either side), the correct command would be:
mp4box source.mp4 -out target.mp4 -par 1=10:11
because (4/3) / (704/480) = 10/11 – exactly the reference pixel aspect ratio for standard definition NTSC video.
For the case given in the question, if it's really 4:3, that gives a very odd pixel aspect ratio: (4/3)/(720/416) = 104/135. It's 720 wide, which suggests a DVD source; it's a 25 fps video, suggesting PAL, but the PAR works out to less than 1, suggesting NTSC. It could be 4:5, I suppose (very close to 104:135), but I don't know of anything that produces that pixel aspect ratio; maybe try that first, and then try 3:4 if it still looks a little too stretched horizontally. If you're certain it's exactly 4:3, of course, just use 104:135.
Delgado's answer is correct that MP4Box can do this, but the -par
option doesn't work quite as described. With an -out
parameter (so as not to disturb your original file):
mp4box source.mp4 -out target.mp4 -par stream-number=width:height
When you use -par stream-number=width:height
, you define the pixel aspect ratio – that is, the result of dividing the device aspect ratio by the storage aspect ratio. (Equivalently, you're describing the aspect ratio of a source pixel.) For example, suppose you have a DVD source that's 720×480, and the correct display aspect ratio is 4:3. For this case, you need:
mp4box source.mp4 -out target.mp4 -par 1=8:9
because (4/3) / (720/480) = 8/9.
If the source represents true SD NTSC pixels (in which case only the central 704×480 pixels are supposed to map to a 4×3 screen, with 8 pixels overscan on either side), the correct command would be:
mp4box source.mp4 -out target.mp4 -par 1=10:11
because (4/3) / (704/480) = 10/11 – exactly the reference pixel aspect ratio for standard definition NTSC video.
For the case given in the question, if it's really 4:3, that gives a very odd pixel aspect ratio: (4/3)/(720/416) = 104/135. It's 720 wide, which suggests a DVD source; it's a 25 fps video, suggesting PAL, but the PAR works out to less than 1, suggesting NTSC. It could be 4:5, I suppose (very close to 104:135), but I don't know of anything that produces that pixel aspect ratio; maybe try that first, and then try 3:4 if it still looks a little too stretched horizontally. If you're certain it's exactly 4:3, of course, just use 104:135.
edited Nov 22 at 0:41
Scott
15.5k113789
15.5k113789
answered Nov 21 at 23:52
Coises
111
111
add a comment |
add a comment |
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