Sur d’autres sites (7622)

• How can I make ffmpeg open my raw video file ?

  29 août 2022, par Mandy Weiss

  I'm trying to convert a raw video-only file to some other formats but all I'm getting ffmpeg to produce is a black video.
There are no error messages displayed and this is what ffprobe shows when analyzing the file :

  



  


  ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
  
 built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
 configuration : —prefix=/usr/local/Cellar/ffmpeg/3.2.2 —enable-shared
 —enable-pthreads —enable-gpl —enable-version3 —enable-hardcoded-tables —enable-avresample —cc=clang —host-cflags= —host-ldflags= —enable-libmp3lame —enable-libx264 —enable-libxvid —enable-opencl —disable-lzma —enable-vda libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 /
 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libavresample 3. 1. 0 / 3. 1. 0 libswscale 4. 2.100 / 
 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 Input #0, avi, from '1.avi' : Metadata :
 encoder : Lavf54.20.4 Duration : 00:00:57.43, start : 0.000000, bitrate : 83196 kb/s
 Stream #0:0 : Video : rawvideo, pal8, 720x480, 83238 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc

  


  



  Other input files can be transcoded to a playable outfile file with the same ffmpeg convert command :

  



  


  ffmpeg -i 1.avi -vcodec h264 output.avi

  


  



  I know the input video is not corrupted because VLC plays it successfully and can even convert it to other formats, but I want to preserve the original one when trying different configurations using ffmpeg.

  



  Thanks in advance for helping !

  


• FFMPEG - infinite file video stream to RTMP server

  5 août 2022, par samoht9277

  I'm trying to create an infinite video stream that I can push to a local RTMP server.

  


  I believe it's worth mentioning that I'm not very good with ffmpeg, I started using it some weeks ago.

  


  Here is a similat question, but it doesn't fully answer what I need.

  


  What I tried

  


  At my first attempt, I made a bash script that spawned a new ffmpeg instance for each video I was trying to stream. I noticed that that the few seconds that takes to spawn the new instance interrupts the stream.

  


  After I noticed this problem, I decided to google some kind of queue system, and I found that ffmpeg has a concat function, that reads a file with a custom syntax and queues it.

  


  So I made a script that lists the files in the directory where I store all my videos, modifies the output with sed, shuffles it (so the episodes are random), and then it redirects the output to a playlist.txt

  


  find /mnt/episode/ -print | sed '/**.mp4/!d' | sed "s/^/file '/; s/$/'/" | shuf > playlist.txt


  


  playlist.txt

  


  example :

  


  ...
file '/mnt/episode/9/1.mp4'
file '/mnt/episode/8/4.mp4'
file '/mnt/episode/5/11.mp4'
file '/mnt/episode/7/15.mp4'
...


  


  This creates 2 problems :

  


  

  1. For some reason, while using the playlist/queue method, when it finishes a video... it takes like 30 seconds to switch to the next video.

  


  


  ffmpeg -f concat -safe 0 -i playlist.txt -f v4l2 /dev/video0


  


  (simplified command, using /dev/video0 device for testing purposes)

  


  ffmpeg does output something after the first video, but i'm not quite sure what it means.

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55c8abc1b900] st: 1 edit list: 1 Missing key frame while searching for timestamp: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55c8abc1b900] st: 1 edit list 1 Cannot find an index entry before timestamp: 0.


  


  

  2. Once the playlist finishes, the stream is over. I could run the script that generates the playlist again, but that would mean that the stream cuts, which I don't want.

  


  


  ---

  


  What I want

  


  I need a way to pick a random file, stream it normally via RTMP and once it finished, automatically pick another one without interrupting the streaming, and keep doing this until I decide to turn it off.

  


  This is the directory format :

  


  episodes
│
├── 1
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
├── 2
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
├── 3
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
├── 4
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
├── 5
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
├── 6
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
├── 7
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
├── 8
│   ├── 1.mp4
│   ├── 2.mp4
│   ├── 3.mp4
│   ...
└── 9
    ├── 1.mp4
    ├── 2.mp4
    ├── 3.mp4
    ...


  


  Gladly appreciate some help here. I tried to make the problem as clear as possible.

  


  Thanks <3

  &#xA;

• Change the Sample/Pixel aspect ratio of video with least possible video re-encoding

  27 août 2022, par PiTao

  I need to have some mp4 videos with square sample (pixel) aspect ratio (1:1) i.e. square pixels. However, as ffprobe shows my video has PAR of 59:54.

  &#xA;

  I have tried using this command :

  &#xA;

  ffmpeg  -i in.mp4 -c copy -bsf:v "h264_metadata=sample_aspect_ratio=1/1" out.mp4


  &#xA;

  but still the PAR has not changed in my downstream applicaiton or as I checked it with the ffprobe :

  &#xA;

  ffprobe version n5.1 Copyright (c) 2007-2022 the FFmpeg developers
  built with gcc 12.1.1 (GCC) 20220730
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vimeo_11261121.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.27.100
  Duration: 00:00:52.36, start: 0.000000, bitrate: 519 kb/s
  Stream #0:0[0x1](eng): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p(progressive), 720x576 [SAR 1:1 DAR 5:4], 382 kb/s, SAR 59:54 DAR 295:216, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : Apple Video Media Handler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s (default)
    Metadata:
      handler_name    : Apple Sound Media Handler
      vendor_id       : [0][0][0][0]


  &#xA;

  If I not mistaken, the ffmpeg only changes the metadata and not the actual PAR. Is it possible to change the PAR (sample aspect ratio) preferably without much re-encoding ?

  &#xA;