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• sws_scale performance comparison to media players real time resize

  14 juillet 2018, par Andrey Katkov

  While playing 4K video user can resize players window - and result image will be scaled smoothly in run time.

  On the other hand - program written with libav which reads 4k video file frame by frame and scale it down with sws_scale function do it less effective : it took more time then video duration to resize it.

  Why is it so ? Maybe because player fps is less and some frames are skipped - but video still looks smooth ?

• Invalid data stream in media could not be discarded by FFMPEG. Why is it staying and how to discard it ?

  5 décembre 2020, par Link-akro

  I have downloaded a [short media][1] i intend to convert then i will use the result as basis to practice and test any and all FFMPEG commands i learn or use later.

  


  That video seems to have an unknown invalid stream which never disappears no matter everything i tried to discard it. When i try to work with it later i get various problems like missing codec or no stream which is not the focus here but the reason why i got stubborn to remove the things i cannot deal with.

  


  The following probing prints a warning in yellow color on last row.

  


   > ffprobe -hide_banner -show_streams Movie_Countdown-youtube_I1vMKZ1kvg0.mov

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Movie_Countdown-youtube_I1vMKZ1kvg0.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2015-05-20T13:45:55.000000Z
  Duration: 00:00:10.00, start: 0.000000, bitrate: 11474 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9930 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2015-05-20T13:45:55.000000Z
      handler_name    : Apple Video Media Handler
      encoder         : H.264
      timecode        : 00:00:00:00
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2015-05-20T13:45:56.000000Z
      handler_name    : Apple Sound Media Handler
      timecode        : 00:00:00:00
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2015-05-20T13:46:11.000000Z
      handler_name    : Time Code Media Handler
      timecode        : 00:00:00:00
Unsupported codec with id 0 for input stream 2


  


  Below the streams output. I split the text so you see the warning without searching in the middle.

  


  [STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=Main
codec_type=video
codec_time_base=1/50
codec_tag_string=avc1
codec_tag=0x31637661
width=1920
height=1080
coded_width=1920
coded_height=1088
closed_captions=0
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuv420p
level=40
color_range=tv
color_space=bt709
color_transfer=bt709
color_primaries=bt709
chroma_location=left
field_order=unknown
timecode=N/A
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=25/1
avg_frame_rate=25/1
time_base=1/25
start_pts=0
start_time=0.000000
duration_ts=250
duration=10.000000
bit_rate=9930739
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=250
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=2015-05-20T13:45:55.000000Z
TAG:language=eng
TAG:handler_name=Apple Video Media Handler
TAG:encoder=H.264
TAG:timecode=00:00:00:00
[/STREAM]
[STREAM]
index=1
codec_name=pcm_s16le
codec_long_name=PCM signed 16-bit little-endian
profile=unknown
codec_type=audio
codec_time_base=1/48000
codec_tag_string=sowt
codec_tag=0x74776f73
sample_fmt=s16
sample_rate=48000
channels=2
channel_layout=stereo
bits_per_sample=16
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=480000
duration=10.000000
bit_rate=1536000
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=480000
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=2015-05-20T13:45:56.000000Z
TAG:language=eng
TAG:handler_name=Apple Sound Media Handler
TAG:timecode=00:00:00:00
[/STREAM]
[STREAM]
index=2
codec_name=unknown
codec_long_name=unknown
profile=unknown
codec_type=data
codec_tag_string=tmcd
codec_tag=0x64636d74
id=N/A
r_frame_rate=0/0
avg_frame_rate=25/1
time_base=1/25
start_pts=0
start_time=0.000000
duration_ts=250
duration=10.000000
bit_rate=3
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=1
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=2015-05-20T13:46:11.000000Z
TAG:language=eng
TAG:handler_name=Time Code Media Handler
TAG:timecode=00:00:00:00
[/STREAM]


  


  I scaled it down and recoded it for starters and i tried to discard the data stream with -dn and failed other methods i will mention at the end.
The output so far suggests that discarding should have worked since alternative datas are 0kB and no stream 2 is listed.

  


   > ffmpeg -hide_banner -dn -i C:\Users\admin-dix\Downloads\Movie_Countdown-youtube_I1vMKZ1kvg0.mov -vf "scale=h=450:w=800" -f mp4 -c:a aac -c:v libx264 mov_countdown.mp4

Output #0, mp4, to 'mov_countdown.mp4':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    encoder         : Lavf58.45.100
    Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 800x450 [SAR 1:1 DAR 16:9], q=-1--1, 0.04 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      creation_time   : 2015-05-20T13:45:55.000000Z
      handler_name    : Apple Video Media Handler
      timecode        : 00:00:00:00
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2015-05-20T13:45:56.000000Z
      handler_name    : Apple Sound Media Handler
      timecode        : 00:00:00:00
      encoder         : Lavc58.91.100 aac
frame=  250 fps= 43 q=-1.0 Lsize=     342kB time=00:00:10.00 bitrate= 280.1kbits/s speed= 1.7x
video:175kB audio:159kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.710857%


  


  Then ffprobe disagrees, there is still the stream and the warning.

  


  ffprobe mov_countdown.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mov_countdown.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:10.02, start: 0.000000, bitrate: 279 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 800x450 [SAR 1:1 DAR 16:9], 142 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : Apple Video Media Handler
      timecode        : 00:00:00:00
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : Apple Sound Media Handler
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
    Metadata:
      handler_name    : Apple Video Media Handler
      timecode        : 00:00:00:00
Unsupported codec with id 0 for input stream 2


  


  I tried negative mapping as per this answer -map 0:d which failed. I did not understand -discard option as ffmpeg documentation refers to from the -vn,-an,-dn entries as it does not specify a stream.

  


  Why does it do that and how can i remove that stream i do not know and do not want to care about in future tests ?

  


  [1] : Clean Retro Movie Countdown - YouTube from Philippe Moesch https://www.youtube.com/watch?v=I1vMKZ1kvg0

  


• FFMPEG Video not working on Social Media Platforms (Flutter-FFMPEG)

  29 avril 2022, par Raj Dhakad

  I am using Flutter-FFMPEG a Flutter library based on Mobile FFMPEG. I am creating a video from a list of .bmp images. The video works plays normally in devices media player on android or desktop.

  


  But when I tried to share that video on social media like say Instagram it says file format not supported.

  


  It didn't use to work on WhatsApp but after some googling, I made some changes and it works on WhatsApp and Youtube now but not on Instagram, Linkedin, etc.

  


  void _runFFmpeg() async {
    print('Run FFMPEG');
   
    var dir = await getApplicationDocumentsDirectory();
    var output = await getExternalStorageDirectory();
    String videoSize = '$ImageWidth:$ImageSize';
    print("${ImageWidth}x$ImageSize");
    var arguments = [
      "-y", // replace output file if it already exists
      "-i", "${output.path}/frame_%d.bmp",
       
      "-s", '${ImageWidth}x$ImageSize',
      "-framerate", "30", // framrate
      
      "-c:v", "libvpx",
      
      '-ab', '128k',
      '-ar', '44100',
      '-strict', 'experimental',
     
      "-vcodec", "libx264",

      "-pixel_format", "yuv420p",

      "-preset", "ultrafast",

      "-tune", "animation",

      "${output.path}/test.mp4"
    ];
   
    await _flutterFFmpeg.executeWithArguments(arguments).then((rc) {
      print('Process done with $rc');
      
    });


  


  


  


  • The plugin I am using (Flutter-FFMPEG) didn't support libx264

    


  


  • I tried using '-profile:v' to baseline but that gives an error, saying Error setting profile to baseline.

    


  


  • Also, I tried to first make a .webm file and then convert that to mp4. I was also able to use '-profile:v' when converting .webm to mp4 and gave no error but the output video didn't work on Social Media platforms.