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• libswscale error Slice Parameters 0, 1080 are invalid

  3 mai 2023, par lokit khemka

  I am trying to scale a video from 1080p to 480p. For that, I have setup swscaler context as :

  


  encoder_sc->sws_ctx = sws_getContext(1920, 1080,
                            AV_PIX_FMT_YUV420P, 
                           854, 480, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL );


  


  However, when I am calling the scale frame function as

  


  sws_scale_frame(encoder->sws_ctx, input_frame, input_frame);


  


  However, when I do that I am getting the error Slice parameter 0, 1080 are in valid. I am very new to FFMPEG and video processing in general. I could not find any solution while searching. Any help is greatly appreciated.

  


  EDIT : I am including the entire source code because I cannot seem to solve the issue.

  


  

typedef struct StreamingContext{
    AVFormatContext* avfc;
    AVCodec *video_avc;
    AVCodec *audio_avc;
    AVStream *video_avs;
    AVStream *audio_avs;
    AVCodecContext *video_avcc;
    AVCodecContext *audio_avcc;
    int video_index;
    int audio_index;
    char* filename;
    struct SwsContext *sws_ctx;
}StreamingContext;


typedef struct StreamingParams{
    char copy_video;
    char copy_audio;
    char *output_extension;
    char *muxer_opt_key;
    char *muxer_opt_value;
    char *video_codec;
    char *audio_codec;
    char *codec_priv_key;
    char *codec_priv_value;
}StreamingParams;


int prepare_video_encoder(StreamingContext *encoder_sc, AVCodecContext *decoder_ctx, AVRational input_framerate,
                          StreamingParams sp)
{
    encoder_sc->video_avs = avformat_new_stream(encoder_sc->avfc, NULL);
    encoder_sc->video_avc = avcodec_find_encoder_by_name(sp.video_codec);
    if (!encoder_sc->video_avc)
    {
        logging("Cannot find the Codec.");
        return -1;
    }

    encoder_sc->video_avcc = avcodec_alloc_context3(encoder_sc->video_avc);
    if (!encoder_sc->video_avcc)
    {
        logging("Could not allocate memory for Codec Context.");
        return -1;
    }

    av_opt_set(encoder_sc->video_avcc->priv_data, "preset", "fast", 0);
    if (sp.codec_priv_key && sp.codec_priv_value)
        av_opt_set(encoder_sc->video_avcc->priv_data, sp.codec_priv_key, sp.codec_priv_value, 0);

    encoder_sc->video_avcc->height = decoder_ctx->height;
    encoder_sc->video_avcc->width = decoder_ctx->width;
    encoder_sc->video_avcc->sample_aspect_ratio = decoder_ctx->sample_aspect_ratio;

    if (encoder_sc->video_avc->pix_fmts)
        encoder_sc->video_avcc->pix_fmt = encoder_sc->video_avc->pix_fmts[0];
    else
        encoder_sc->video_avcc->pix_fmt = decoder_ctx->pix_fmt;

    encoder_sc->video_avcc->bit_rate = 2 * 1000 * 1000;
    encoder_sc->video_avcc->rc_buffer_size = 4 * 1000 * 1000;
    encoder_sc->video_avcc->rc_max_rate = 2 * 1000 * 1000;
    encoder_sc->video_avcc->rc_min_rate = 2.5 * 1000 * 1000;

    encoder_sc->video_avcc->time_base = av_inv_q(input_framerate);
    encoder_sc->video_avs->time_base = encoder_sc->video_avcc->time_base;

    //Creating Scaling Context
    encoder_sc->sws_ctx = sws_getContext(1920, 1080,
                            decoder_ctx->pix_fmt, 
                           854, 480, encoder_sc->video_avcc->pix_fmt, SWS_BICUBIC, NULL, NULL, NULL );
    if (!encoder_sc->sws_ctx){logging("Cannot Create Scaling Context."); return -1;}

    if (avcodec_open2(encoder_sc->video_avcc, encoder_sc->video_avc, NULL) < 0)
    {
        logging("Could not open the Codec.");
        return -1;
    }
    avcodec_parameters_from_context(encoder_sc->video_avs->codecpar, encoder_sc->video_avcc);
    return 0;
}



int transcode_video(StreamingContext *decoder, StreamingContext *encoder, AVPacket *input_packet, AVFrame *input_frame, AVFrame *scaled_frame)
{
    int response = avcodec_send_packet(decoder->video_avcc, input_packet);
    if (response < 0)
    {
        logging("Error while sending the Packet to Decoder: %s", av_err2str(response));
        return response;
    }

    while (response >= 0)
    {
        response = avcodec_receive_frame(decoder->video_avcc, input_frame);
        
        if (response == AVERROR(EAGAIN) || response == AVERROR_EOF)
        {
            break;
        }
        else if (response < 0)
        {
            logging("Error while receiving frame from Decoder: %s", av_err2str(response));
            return response;
        }
        if (response >= 0)
        {
            scaled_frame->format = encoder->video_avcc->pix_fmt;
            scaled_frame->width = 854;
            scaled_frame->height = 480;
            sws_scale_frame(encoder->sws_ctx, scaled_frame, input_frame);
            //ERROR is in the scaled_frame
            if (encode_video(decoder, encoder, scaled_frame)) 
                return -1;
        }

        av_frame_unref(input_frame);
    }
    return 0;
}



  


• Make 2 videos on top of each other in a 1080×1920 scene

  6 octobre 2023, par Byte me

  I am trying to make two videos on top of each other. Right now i am scaling both to 1080x960 using ffmpeg and putting them together using vstack. Unfortunetely no success. Can anyone help me ?

  


    ffmpeg()
      .input('./placeholder.mp4').videoCodec('copy')
      .input("./scaled_YT.mp4").videoCodec('copy')
      .complexFilter([
        `[0:v]scale=1080x960[v0];[1:v]scale=1080x960[v1];[v0][v1]vstack=inputs=2[v]`
    ], ['v'])
      .toFormat('mp4')
      .on('end', () => {
          console.log('Files have been merged!');
      })
      .on('error', (err) => {
          console.error('Error:', err)
      })
      .save(outputPath);


  


  Error: Error: ffmpeg exited with code 1: &#xA;    at ChildProcess.<anonymous> (D:\Discord Bots\TEMP_TEST\done_projects\videoEditor_bot\node_modules\fluent-ffmpeg\lib\processor.js:182:22)  &#xA;    at ChildProcess.emit (node:events:513:28)&#xA;    at ChildProcess._handle.onexit (node:internal/child_process:291:12)&#xA;</anonymous>

  


• Commit tterribe’s port of Tremor r17541 :

  23 octobre 2010, par Monty

  Commit tterribe’s port of Tremor r17541 :