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• what codec to specify to accessing my HDMI-to-USB adaptor, under Linux ? [closed]

  14 mai 2022, par David

  A week or so ago,I bought a HDMI-to-USB adapter, to use to capture video
TV content from my TV's set-top box. (Xfinity, if it matters. Box generically is :
"XiD X1"...I have both the Pace and the Cisco models available here in this house.)

  


  Specifically, here's the adapter I bought,from Amazon :
https://www.amazon.com/gp/product/B09FLN63B3

  


  So, I'm fluent in both Windows (Win-11) and Linux (Debian 'Bullseye', on my chromebook).

  


  The adapter does not come with any recommendations for what software/drivers to (try to) use, but I was prepared for that.
After some google searches, I decided to first try using the cmd-line
'ffmpeg' program, because I'm
quite familiar with that (excellent !) piece of open-source software !

  


  So, after a day or two of (mostly) success recordings under Win-11, using
ffmpeg's Microsoft-based 'dshow' (aka 'DirectShow'), I decided to attempt to get
up to the same level of accomplishment on my Chromebook, under Linux, also
using 'ffmpeg'.

  


  [Ok...a very brief explanation of 'mostly' successful. I'll
post another separate question here, about the specifics of my glitches,
using 'dshow' on Windows. But, essentially, when I try to record to a MP4
file, I get 2 scenarios of glitch : #1 : Suddenly, dropped packets surges up,
and I get "1000 dropped' yellow msg #2 : On other trials, I get '...contains
no image...'.) So, I figured I should first give a Linux a chance,
before spending more effort trying to resolve the glitches on Windows.]

  


  My first snag, was learning that 'dshow' seems to be specific to 'Windows',
and thus ffmpeg is getting 'unknown' for my reference to 'dshow'. After more hours of 'guessing', I've finally learned/concluded that there are other things
(something call "DeckLink" is one such alternative ?) for Linux, but I'm unclear
what extra Linux packages might exist for ffmpeg support, or whether I will need to built a more complete 'ffmpeg' (e.g. from source code), to get things going under Linux ?

  


  Is my device able to be accessed from some tools other than 'ffmpeg' ?
(e.g. VLC or Handbrake or whatever ?) more easily, on the Linux platform ?

  


  [If I had to, I'd probably invest another $20-$50 in some other hardware
device that goes from HDMI-to-USB (USB-A/B), if it were ]

  


  All ideas are welcome...(TIA)

  


  — Dave

  


• ffmpeg getting syntax error when run inside shell script only.. Why ? [duplicate]

  10 décembre 2017, par bmck2006

  This question already has an answer here :

  • Unexpected ’(’ in bash [duplicate]
    
    2 answers
    

  OS : Raspbian

  I’m currently working on a bash script that will merge all .AVI videos in the current directory, to one .AVI file. I’ve found the following to work perfectly for me, when run directly in the terminal :

  ffmpeg -f concat -safe 0 -i <(find . -name '*.avi' -printf "file '$PWD/%p'\n") -c copy "$(date -d '-1 day' +'%F')".avi

  This works perfectly, and I find a new .AVI file listed in the current directory (with a date name from yesterday).

  Now, when I add this same command to my script (merge.sh), I get the following output :

  /home/pi/Documents/MotionScripts/merge.sh: 11: 
  
  /home/pi/Documents/MotionScripts/merge.sh: Syntax error: "(" unexpected

  This is beyond frustrating. And yes, ffmpeg command from earlier is on line 11. The script navigates to the correct directory where the multiple .avi files are stored.

  Here is the entire script :

  #!/bin/bash
  
  
  
  #This script combines multiple AVI files within the current directory, into one long video
  
  
  
  cd /media/myBook/Security/yesterday
  
  
  
  sudo mv * /home/pi/Videos/tempconversion
  
  
  
  cd /home/pi/Videos/tempconversion
  
  
  
  ffmpeg -f concat -safe 0 -i <(find . -name '*.avi' -printf "file '$PWD/%p'\n") -c copy "$(date -d '-1 day' +'%F')".avi
  
  
  
  sudo mv "$(date -d '-1 day' +'%F')".avi /media/myBook/Security/yesterday
  
  
  
  sudo rm -f *

  Why am I getting the syntax error only when the same command is being issued within an executable script ?

  RESOLVED ! Shouldn’t have used ’sh’ to run the script. Make sure the script is executable (sudo chmod +x merge.sh) and run by entering the full path.

• Executing shell script on Google Cloud Functions

  9 juillet 2020, par João Abrantes

  I am trying to encode .mp4 videos into hls using FFmpeg.

  


  I am using subprocess to call FFmpeg :

  


  def transcoder(data, context):
    """Background Cloud Function to be triggered by Cloud Storage.
       This generic function logs relevant data when a file is changed.

    Args:
        data (dict): The Cloud Functions event payload.
        context (google.cloud.functions.Context): Metadata of triggering event.
    Returns:
        None; the output is written to Stackdriver Logging
    """
    try:
        input_filename = data['name'].split('/')[-1] #videos have no extension
        input_path = f'/tmp/{input_filename}'
        print(f'filename {input_filename}')
        print(f'input_path {input_path}')
        print(f"bucket {data['bucket']}")
        print(f"name {data['name']}")

        outdir_path = f'/tmp/output/{input_filename}'
        os.makedirs(outdir_path, exist_ok=True)

        bucket = client.get_bucket(data['bucket'])
        blob = bucket.get_blob(data['name'])
        blob.download_to_filename(input_path)

        cmd = f'''ffmpeg -y -i {input_path} \
              -preset ultrafast -g 60 -sc_threshold 0 \
              -map 0:0 -map 0:1 -map 0:0 -map 0:1 \
              -s:v:0 360x640 -c:v:0 libx264 -b:v:0 365k \
              -s:v:1 720x1280 -c:v:1 libx264 -b:v:1 3000k \
              -c:a copy \
              -var_stream_map "v:0,a:0 v:1,a:1" \
              -master_pl_name master.m3u8 \
              -f hls -hls_time 6 -hls_list_size 0 \
              -hls_segment_filename "{outdir_path}/%v_fileSequence%d.ts" \
              -hls_playlist_type vod \
               {outdir_path}/%v_prog_index.m3u8'''

        process = subprocess.Popen(cmd)
        stdout, stderr = process.communicate()
        upload_local_directory_to_gcs(outdir_path, upload_bucket, input_filename)
    except Exception as e:
        print(e)


  


  The problem is that I get an error :

  


  [Errno 2] No such file or directory: 'ffmpeg -y -i /tmp/video -preset ultrafast -g 60 -sc_threshold 0 -map 0:0 -map 0:1 -map 0:0 -map 0:1 -s:v:0 360x640 -c:v:0 libx264 -b:v:0 365k -s:v:1 720x1280 -c:v:1 libx264 -b:v:1 3000k -c:a copy -var_stream_map "v:0,a:0 v:1,a:1" -master_pl_name master.m3u8 -f hls -hls_time 6 -hls_list_size 0 -hls_segment_filename "/tmp/output/video/%v_fileSequence%d.ts" -hls_playlist_type vod /tmp/output/video/%v_prog_index.m3u8': 'ffmpeg -y -i /tmp/video -preset ultrafast -g 60 -sc_threshold 0 -map 0:0 -map 0:1 -map 0:0 -map 0:1 -s:v:0 360x640 -c:v:0 libx264 -b:v:0 365k -s:v:1 720x1280 -c:v:1 libx264 -b:v:1 3000k -c:a copy -var_stream_map "v:0,a:0 v:1,a:1" -master_pl_name master.m3u8 -f hls -hls_time 6 -hls_list_size 0 -hls_segment_filename "/tmp/output/video/%v_fileSequence%d.ts" -hls_playlist_type vod /tmp/output/video/%v_prog_index.m3u8'


  


  But I know that the input files and the output files do exist because I debugged that using print(os.listdir(path)) so now I am wondering if the FFmpeg I call with subprocess has access to the /tmp folder..?

  


  I know that there is a Python FFmpeg library I could use, but I don't know how to run my FFmpeg command using that library. Can you help ?

  


  p.s. I can run this locally with success.