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    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

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    Il faut au préalable rajouter un champ "Date de publication" dans le masque de formulaire adéquat :
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    Dans la rubrique "Champs à ajouter, cocher "Date de publication "
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Sur d’autres sites (9095)

  • Concatenating slideshows and normal videos causes audio bleeding

    28 janvier 2019, par Zurechtweiser

    I noticed audio bleeding with concatenated videos containing alternating slideshows and normal videos.

    My commands

    ffmpeg -y -ss 00:00:04.391 -to 00:02:17.171 -i "test.MP4" -r 60 -c:v libx264 -af afade=t=in:ss=0:d=1,afade=t=out:st='00\:02\:11.780':d=1 25.mp4
    
ffmpeg -y -i 25.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts 25f.ts
    

    
ffmpeg -y -loop 1 -i "test.JPG" -t 2 -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -shortest -r 60 -c:v libx264 -c:a aac -pix_fmt yuv420p -vf scale=-2:1080,pad=width=1920:height=1080:x=240:y=0:color=black 26.mp4
    
ffmpeg -y -i 26.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts 26f.ts
    

    
ffmpeg -y -i "concat:25f.ts|26f.ts" -bsf:a aac_adtstoasc -movflags faststart -c copy "final.mp4"

    The rest of audio of test.MP4 bleeds into the beginning of the test.JPG-single frame slideshow.

    I presumed a different framerate to cause it, but adding -r 60 didn’t solve the issue.

    Also it seems that the video player interpretes the final video as a set of single videos, as whenever a "new" video shows up, it stutters slightly and loses framerate.

    How do I concat them without bleeding and create a final video without stuttering ?

    ffprobe -show_streams 25.mp4 :

    ffprobe version N-92246-gc2ac3b8e6a Copyright (c) 2007-2018 the FFmpeg developers
    
  built with gcc 8.2.1 (GCC) 20181017
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
    
  libavutil      56. 19.101 / 56. 19.101
    
  libavcodec     58. 33.102 / 58. 33.102
    
  libavformat    58. 19.102 / 58. 19.102
    
  libavdevice    58.  4.106 / 58.  4.106
    
  libavfilter     7. 37.100 /  7. 37.100
    
  libswscale      5.  2.100 /  5.  2.100
    
  libswresample   3.  2.100 /  3.  2.100
    
  libpostproc    55.  2.100 / 55.  2.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '25.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.19.102
    
  Duration: 00:00:12.65, start: 0.000000, bitrate: 2040 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1215:1216 DAR 135:76], 1903 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandle
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandle
    
[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=1/120
    
codec_tag_string=avc1
    
codec_tag=0x31637661
    
width=1920
    
height=1080
    
coded_width=1920
    
coded_height=1088
    
has_b_frames=2
    
sample_aspect_ratio=1215:1216
    
display_aspect_ratio=135:76
    
pix_fmt=yuv420p
    
level=42
    
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=60/1
    
avg_frame_rate=60/1
    
time_base=1/15360
    
start_pts=0
    
start_time=0.000000
    
duration_ts=193792
    
duration=12.616667
    
bit_rate=1903528
    
max_bit_rate=N/A
    
bits_per_raw_sample=8
    
nb_frames=757
    
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=VideoHandle
    
[/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=606192
    
duration=12.629000
    
bit_rate=128049
    
max_bit_rate=128049
    
bits_per_raw_sample=N/A
    
nb_frames=593
    
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=SoundHandle
    
[/STREAM]

    ffprobe -show_streams 26.mp4 :

    ffprobe version N-92246-gc2ac3b8e6a Copyright (c) 2007-2018 the FFmpeg developers
    
  built with gcc 8.2.1 (GCC) 20181017
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
    
  libavutil      56. 19.101 / 56. 19.101
    
  libavcodec     58. 33.102 / 58. 33.102
    
  libavformat    58. 19.102 / 58. 19.102
    
  libavdevice    58.  4.106 / 58.  4.106
    
  libavfilter     7. 37.100 /  7. 37.100
    
  libswscale      5.  2.100 /  5.  2.100
    
  libswresample   3.  2.100 /  3.  2.100
    
  libpostproc    55.  2.100 / 55.  2.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '26.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.19.102
    
  Duration: 00:00:03.95, start: 0.000000, bitrate: 1814 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 2272x4608 [SAR 1:1 DAR 71:144], 1798 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
[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=1/120
    
codec_tag_string=avc1
    
codec_tag=0x31637661
    
width=2272
    
height=4608
    
coded_width=2272
    
coded_height=4608
    
has_b_frames=2
    
sample_aspect_ratio=1:1
    
display_aspect_ratio=71:144
    
pix_fmt=yuv420p
    
level=60
    
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=60/1
    
avg_frame_rate=60/1
    
time_base=1/15360
    
start_pts=0
    
start_time=0.000000
    
duration_ts=60672
    
duration=3.950000
    
bit_rate=1798815
    
max_bit_rate=N/A
    
bits_per_raw_sample=8
    
nb_frames=237
    
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=und
    
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=1/44100
    
codec_tag_string=mp4a
    
codec_tag=0x6134706d
    
sample_fmt=fltp
    
sample_rate=44100
    
channels=2
    
channel_layout=stereo
    
bits_per_sample=0
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/44100
    
start_pts=0
    
start_time=0.000000
    
duration_ts=132300
    
duration=3.000000
    
bit_rate=2124
    
max_bit_rate=128000
    
bits_per_raw_sample=N/A
    
nb_frames=131
    
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=und
    
TAG:handler_name=SoundHandler
    
[/STREAM]

  • ffmpeg : simple RTMP streaming

    2 avril 2013, par sajad

    I am trying to launch up a rtmp transcoder server using ffmpeg ; that receives udp MPEG-TS streams as input, transcodes it ; and generates an rtmp output to a URL, that can be accessed by users to receive and play the rtmp stream. All these are expected to be performed in a LAN and the output be accessed by all users.

    1) First I don't know where the URL should point to. Is it enought to specify the IP of the system and some optional port ? Is it neccessary that a program should be listening on that port ?

    2) How I can play the stream on the URL ?

    I use a linux ubuntu machine whith IP=10.1.1.229 and I want to transcode multicast stream on this URL : udp://@224.10.1.1:2001.

    here is the command used to transcode input stream and generate rtmp url "rtmp ://10.1.1.229:2020".

    ffmpeg -y -f mpegts -i "udp://@224.10.1.1:2001" -re -vcodec libx264 -maxrate 700k -r 25 -s 640x360 -deinterlace -acodec libfaac -ab 64k -ac 1 -ar 44100 -f flv "rtmp://10.1.1.229:2020"

    and here is the command by which I am trying to play rtmp stream :

    ffplay rtmp://10.1.1.229:2020

    Any guidance would be helpfull. Thank you.

  • ffmpeg : simple RTMP streaming over LAN

    30 mars 2013, par sajad

    I am trying to launch up a rtmp transcoder server using ffmpeg ; that receives udp MPEG-TS streams as input, transcodes it ; and generates an rtmp output to a URL, that can be accessed by users to receive and play the rtmp stream. All these are expected to be performed in a LAN and the output be accessed by all users.

    1) First I don't know where the URL should point to. Is it enought to specify the IP of the system and some optional port ? Is it neccessary that a program should be listening on that port ?

    2) How I can play the stream on the URL ?

    I use a linux ubuntu machine whith IP=10.1.1.229 and I want to transcode multicast stream on this URL : udp://@224.10.1.1:2001.

    here is the command used to transcode input stream and generate rtmp url "rtmp ://10.1.1.229:2020".

    ffmpeg -y -f mpegts -i "udp://@224.10.1.1:2001" -re -vcodec libx264 -maxrate 700k -r 25 -s 640x360 -deinterlace -acodec libfaac -ab 64k -ac 1 -ar 44100 -f flv "rtmp://10.1.1.229:2020"

    and here is the command by which I am trying to play rtmp stream :

    ffplay rtmp://10.1.1.229:2020

    Any guidance would be helpfull. Thank you.

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