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  • duration change after transcode ts

    25 décembre 2017, par Feilong Luo

    i have a problem about transcode with ffmpeg

    i want to cover m3u8 to mp4, so i transcode every ts file first, and then concat them to a mp4, but i found that the duration will be bigger than source file.

    source file is : http://oc7iy3eta.bkt.clouddn.com/src_20.ts

    after transcode, test file is: http://oc7iy3eta.bkt.clouddn.com/test_20.ts

    i use the command as bellow to change to 5fps, and 400k bitrate:

    sudo ffmpeg -analyzeduration 2147483647 -probesize 2147483647 -nostdin -y -v warning -i ./src_20.ts -threads 3 -movflags faststart -metadata:s:v rotate=0 -chunk_duration 520000 -video_track_timescale 25000 -pix_fmt yuv420p -copytb 1 -vcodec libx264 -b:v 400000 -minrate 400000 -maxrate 400000 -bufsize 500k -force_key_frames "expr:gte(t,n_forced*2)" -vsync 1 -r 5 -s 544*960 -acodec libfaac -async 1 ./test_20.ts

    i use ffprobe command to see video info:

    source file info:

    Duration: 00:00:01.26, start: 28.346989, bitrate: 921 kb/s Program 1 Metadata: service_name : Service01 service_provider: FFmpeg Stream #0:0[0x100]: Audio: aac ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 23 kb/s Stream #0:1[0x101]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 544x960, 10.67 tbr, 90k tbn, 180k tbc

    test file:

    Input #0, mpegts, from 'test_20.ts': Duration: 00:00:01.62, start: 1.576778, bitrate: 447 kb/s Program 1 Metadata: service_name : Service01 service_provider: FFmpeg Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 544x960, 5 fps, 5 tbr, 90k tbn, 10 tbc Stream #0:1[0x101]: Audio: aac ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 5 kb/s

    =======================================================================

    question

    so , we can see that the duration of src file is 1.26s , but after transcode, the test file is 1.62s.

    why? can anybody help

  • How to render YUV420P frames using DirectX ?

    25 décembre 2017, par TTGroup

    I'm using FFMPEG C++ to decode a video file.

    I decoded the frames under YUV420P format in System Memory.

    Next step, I want to render these frames by using DirectX.

    I searched many times, and I know that I have to use the texture2D, but there is not any code sample for my case.

    How to create a texture2D from YUV420 (or RGB instead) from System Memory and render it to the screen.

    And the performance is also important, so I need the best way to do it. Someone can show me the sample code?

    Many Thanks!

  • FFmpeg, MPEG4 video rotate and Windows

    25 décembre 2017, par user3768884

    I have this kind of video recorded in some Samsung Galaxy phone (info from: "ffprobe -v error -show_format -show_streams filename.mp4")

    [STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_time_base=7048499/423000000
codec_tag_string=avc1
codec_tag=0x31637661
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=0
sample_aspect_ratio=0:1
display_aspect_ratio=0:1
pix_fmt=yuv420p
level=40
color_range=unknown
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=left
field_order=unknown
timecode=N/A
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=30/1
avg_frame_rate=211500000/7048499
time_base=1/90000
start_pts=0
start_time=0.000000
duration_ts=7048499
duration=78.316656
bit_rate=17010472
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=2350
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:rotate=90
TAG:creation_time=2017-12-17T13:42:14.000000Z
TAG:language=eng
TAG:handler_name=VideoHandle
[SIDE_DATA]
side_data_type=Display Matrix
displaymatrix=
00000000:            0       65536           0
00000001:       -65536           0           0
00000002:            0           0  1073741824

rotation=-90
[/SIDE_DATA]
[/STREAM]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/48000
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=48000
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/48000
start_pts=0
start_time=0.000000
duration_ts=3772416
duration=78.592000
bit_rate=126154
max_bit_rate=128000
bits_per_raw_sample=N/A
nb_frames=3684
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:creation_time=2017-12-17T13:42:14.000000Z
TAG:language=eng
TAG:handler_name=SoundHandle
[/STREAM]
[FORMAT]
filename=original_galaxy.mp4
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=78.592000
size=167808936
bit_rate=17081528
probe_score=100
TAG:major_brand=isom
TAG:minor_version=0
TAG:compatible_brands=isom3gp4
TAG:creation_time=2017-12-17T13:42:14.000000Z
[/FORMAT]

    Since all my media players does not support rotate-knowledge, I have turned the video over again, and at the same time slightly decreased the resolution of command "ffmpeg -i "input.mp4" -vf "scale=720:1280,transpose=0,transpose=0" -c:a copy "output.mp4""

    [STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_time_base=1/60
codec_tag_string=avc1
codec_tag=0x31637661
width=720
height=1280
coded_width=720
coded_height=1280
has_b_frames=2
sample_aspect_ratio=0:1
display_aspect_ratio=0:1
pix_fmt=yuv420p
level=31
color_range=unknown
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=left
field_order=unknown
timecode=N/A
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=30/1
avg_frame_rate=30/1
time_base=1/15360
start_pts=0
start_time=0.000000
duration_ts=1203717
duration=78.366992
bit_rate=2570692
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=2351
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=VideoHandler
[/STREAM]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/48000
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=48000
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/48000
start_pts=0
start_time=0.000000
duration_ts=3772416
duration=78.592000
bit_rate=126154
max_bit_rate=126154
bits_per_raw_sample=N/A
nb_frames=3684
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=SoundHandler
[/STREAM]
[FORMAT]
filename=from_ffmpeg.mp4
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=78.592000
size=26503544
bit_rate=2697836
probe_score=100
TAG:major_brand=isom
TAG:minor_version=512
TAG:compatible_brands=isomiso2avc1mp41
TAG:encoder=Lavf57.41.100
[/FORMAT]

    This works very well in VLC, for example. However, Windows Media Player or Samsung TV does not play it. Windows Explorer does not even show a video thumbnail, so the video file is broken by Windows.

    Is not FFmpeg able to produce a standard MPEG4 file, or what the hell is this about? I've tried all the alternatives presented, such as "-fflags +genpts", "-fflags genpts", "-movflags faststart", "-movflags +faststart", "pix_fmt=yuv420p" etc. but nothing worked.

    The sound I copied directly.

  • Camera2 API switching camera during recording

    24 décembre 2017, par Max Efimov

    I'm working with Camera2 API and in my app it's important to switch the camera during recording. After each camera switch I save video fragment to disk, and after stopping the recording I merge videos into one using -f concat -safe 0 -i listPath -c copy finalPath command of FFmpeg for Android. When I open a separate video fragment, it looks correct, but when I open the merged video, videos recorded on the back camera are rotated 180 degrees. The problem is only in the merged video.

    In meta-tag of videos if video recorded on back camera, then "rotate" tag has 90 degrees, otherwise 270 degrees.

    As I understood when ffmpeg merges a videos it automatically rotates the video if it has different "rotate" tag in he's metatags.

    How I can solve this problem?

    P.S Also I tried to use MP4Parser Library for merging, but it has the same problems.
    P.P.S. -noautorotate param for ffmpeg does not help me.

  • Combine two or more images that partially overlap

    24 décembre 2017, par Smeterlink

    Having two or more images that partially overlap, like in this screenshot, I want to combine/merge them into one:

    overlapping images

    The coloured squares would be the source images, in lossless format, and no rotation is required.

    The result I want is like using the "Auto-Blend Layers" command from Adobe Photoshop, so auto-align and auto-blend is performed automatically:

    https://helpx.adobe.com/photoshop/using/combine-images-auto-blend-layers.html

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