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• 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.

  


• How to get the video's duration or number of frames in ffmpeg filter

  1er juillet 2020, par Reasno

  I'm writing a filter in ffmpeg and I have to get the duration or number of frames in filter_frame function. But the parameters of "filter_frame" function only consist of AVFilterLink and AVFrame :

  


  static int filter_frame(AVFilterLink* link, AVFrame* in) {
    AVFilterContext* avctx = link->dst;
    ExtractContext* privCtx = (ExtractContext*)avctx->priv;
    AVFilterLink* outlink = avctx->outputs[0];
    //here I want to get the duration of total number of frames:
}


  


  I can't find attributes which is related to duration of frame numbers in either class. I have googles but all answers are about getting duration or frame numbers using ffmpeg.exe, which don't meet my requirements because I have to get them in self-written filter in FFMPEG. Thanks for your help !

  


• Removed number stripping from stripHtml. Fixes #2

  28 avril 2012, par Max Lynch

  m additional-methods.js m test/methods.js Removed number stripping from stripHtml. Fixes #2