Max bitrate property issue

[ViswanathB84]

Thank you very much for developing and supporting this great FFMPEG libaray .

I am an iOS developer. I used FFMPEG library for video conversion i.e mpg format to mp4 format. I am getting below error in debug console.

Input #0, mpeg, from '/Users/Library/Developer/CoreSimulator/Devices/A71B16D3-86A9-4403-A6B1-9A8D23B842C0/data/Containers/Bundle/Application/FFA13844-61BD-4A81-9A2F-CACDB6BC6ADA/DLGDemo.app/iOSQuickstartMVVM.mpg': Duration: 00:05:15.69, start: 0.508278, bitrate: 982 kb/s Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 104857 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc Stream #0:1[0x1c0]: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s [h264_videotoolbox @ 0x7ff34a018200] Error setting max bitrate property: -12902 Cannot open video encoder for stream #0 Error occurred: Generic error in an external library.

Would you please help on this how to resolve this issue. Thank you very much for your support.

[kewlbear]

You should show relevant source code of your app to get help from anyone.

[ViswanathB84]

Thank you very much for your support. I am getting below error in open_output_file method at encoder = avcodec_find_encoder(dec_ctx->codec_id); line and it returns null value.

XPC connection interrupted Input #0, mpeg, from '/Users/viswanath/Library/Developer/CoreSimulator/Devices/A71B16D3-86A9-4403-A6B1-9A8D23B842C0/data/Containers/Bundle/Application/73503E38-AF99-4539-8453-FBB5C8B28F46/DLGDemo.app/iOSQuickstartMVVM.mpg': Duration: 00:05:15.69, start: 0.508278, bitrate: 982 kb/s Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 104857 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc Stream #0:1[0x1c0]: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s Necessary encoder not found Error occurred: Invalid data found when processing input

`

import "FFMpegVideoConversion.h"

include <libavcodec/avcodec.h>

include <libavformat/avformat.h>

include <libavfilter/buffersink.h>

include <libavfilter/buffersrc.h>

include <libavutil/opt.h>

include <libavutil/pixdesc.h>

include "libavfilter/avfiltergraph.h"

include "libavutil/common.h"

include "libavutil/imgutils.h"

include "libavutil/mathematics.h"

include "libavutil/samplefmt.h"

include "libavutil/channel_layout.h"

static AVFormatContext ifmt_ctx; static AVFormatContext ofmt_ctx; typedef struct FilteringContext { AVFilterContext buffersink_ctx; AVFilterContext buffersrc_ctx; AVFilterGraph filter_graph; } FilteringContext; static FilteringContext filter_ctx; typedef struct StreamContext { AVCodecContext dec_ctx; AVCodecContext enc_ctx; } StreamContext; static StreamContext *stream_ctx;

@implementation FFMpegVideoConversion

static int open_input_file(const char filename) { int ret; unsigned int i; ifmt_ctx = NULL; if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n"); return ret; } if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n"); return ret; } stream_ctx = av_mallocz_array(ifmt_ctx->nb_streams, sizeof(stream_ctx)); if (!stream_ctx) return AVERROR(ENOMEM); for (i = 0; i < ifmt_ctx->nb_streams; i++) { AVStream stream = ifmt_ctx->streams[i]; AVCodec dec = avcodec_find_decoder(stream->codecpar->codec_id); AVCodecContext codec_ctx; if (!dec) { av_log(NULL, AV_LOG_ERROR, "Failed to find decoder for stream #%u\n", i); return AVERROR_DECODER_NOT_FOUND; } codec_ctx = avcodec_alloc_context3(dec); if (!codec_ctx) { av_log(NULL, AV_LOG_ERROR, "Failed to allocate the decoder context for stream #%u\n", i); return AVERROR(ENOMEM); } ret = avcodec_parameters_to_context(codec_ctx, stream->codecpar); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Failed to copy decoder parameters to input decoder context " "for stream #%u\n", i); return ret; } / Reencode video & audio and remux subtitles etc. / if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) codec_ctx->framerate = av_guess_frame_rate(ifmt_ctx, stream, NULL); / Open decoder / ret = avcodec_open2(codec_ctx, dec, NULL); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i); return ret; } } stream_ctx[i].dec_ctx = codec_ctx; } av_dump_format(ifmt_ctx, 0, filename, 0); return 0; } static int open_output_file(const char filename) { AVStream out_stream; AVStream in_stream; AVCodecContext dec_ctx, enc_ctx; AVCodec encoder; int ret; unsigned int i; ofmt_ctx = NULL; avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename); if (!ofmt_ctx) { av_log(NULL, AV_LOG_ERROR, "Could not create output context\n"); return AVERROR_UNKNOWN; } for (i = 0; i < ifmt_ctx->nb_streams; i++) { out_stream = avformat_new_stream(ofmt_ctx, NULL); if (!out_stream) { av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n"); return AVERROR_UNKNOWN; } in_stream = ifmt_ctx->streams[i]; dec_ctx = stream_ctx[i].dec_ctx; if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { / in this example, we choose transcoding to same codec / encoder = avcodec_find_encoder(dec_ctx->codec_id); if (!encoder) { av_log(NULL, AV_LOG_FATAL, "Necessary encoder not found\n"); return AVERROR_INVALIDDATA; } enc_ctx = avcodec_alloc_context3(encoder); if (!enc_ctx) { av_log(NULL, AV_LOG_FATAL, "Failed to allocate the encoder context\n"); return AVERROR(ENOMEM); } / In this example, we transcode to same properties (picture size,

• sample rate etc.). These properties can be changed for output
• streams easily using filters / if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) { enc_ctx->height = dec_ctx->height; enc_ctx->width = dec_ctx->width; enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio; / take first format from list of supported formats / if (encoder->pix_fmts) enc_ctx->pix_fmt = encoder->pix_fmts[0]; else enc_ctx->pix_fmt = dec_ctx->pix_fmt; / video time_base can be set to whatever is handy and supported by encoder / enc_ctx->time_base = av_inv_q(dec_ctx->framerate); } else { enc_ctx->sample_rate = dec_ctx->sample_rate; enc_ctx->channel_layout = dec_ctx->channel_layout; enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout); / take first format from list of supported formats / enc_ctx->sample_fmt = encoder->sample_fmts[0]; enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate}; } / Third parameter can be used to pass settings to encoder / ret = avcodec_open2(enc_ctx, encoder, NULL); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i); return ret; } ret = avcodec_parameters_from_context(out_stream->codecpar, enc_ctx); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Failed to copy encoder parameters to output stream #%u\n", i); return ret; } if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER; out_stream->time_base = enc_ctx->time_base; stream_ctx[i].enc_ctx = enc_ctx; } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) { av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i); return AVERROR_INVALIDDATA; } else { / if this stream must be remuxed / ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Copying parameters for stream #%u failed\n", i); return ret; } out_stream->time_base = in_stream->time_base; } } av_dump_format(ofmt_ctx, 0, filename, 1); if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) { ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename); return ret; } } / init muxer, write output file header / ret = avformat_write_header(ofmt_ctx, NULL); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n"); return ret; } return 0; } static int init_filter(FilteringContext fctx, AVCodecContext dec_ctx, AVCodecContext enc_ctx, const char filter_spec) { char args[512]; int ret = 0; const AVFilter buffersrc = NULL; const AVFilter buffersink = NULL; AVFilterContext buffersrc_ctx = NULL; AVFilterContext buffersink_ctx = NULL; AVFilterInOut outputs = avfilter_inout_alloc(); AVFilterInOut inputs = avfilter_inout_alloc(); AVFilterGraph filter_graph = avfilter_graph_alloc(); if (!outputs || !inputs || !filter_graph) { ret = AVERROR(ENOMEM); goto end; } if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) { buffersrc = avfilter_get_by_name("buffer"); buffersink = avfilter_get_by_name("buffersink"); if (!buffersrc || !buffersink) { av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n"); ret = AVERROR_UNKNOWN; goto end; } snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d", dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt, dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_aspect_ratio.num, dec_ctx->sample_aspect_ratio.den); ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", args, NULL, filter_graph); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n"); goto end; } ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", NULL, NULL, filter_graph); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n"); goto end; } ret = av_opt_set_bin(buffersink_ctx, "pix_fmts", (uint8_t)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt), AV_OPT_SEARCH_CHILDREN); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n"); goto end; } } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) { buffersrc = avfilter_get_by_name("abuffer"); buffersink = avfilter_get_by_name("abuffersink"); if (!buffersrc || !buffersink) { av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n"); ret = AVERROR_UNKNOWN; goto end; } if (!dec_ctx->channel_layout) dec_ctx->channel_layout = av_get_default_channel_layout(dec_ctx->channels); snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64, dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate, av_get_sample_fmt_name(dec_ctx->sample_fmt), dec_ctx->channel_layout); ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", args, NULL, filter_graph); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n"); goto end; } ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", NULL, NULL, filter_graph); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n"); goto end; } ret = av_opt_set_bin(buffersink_ctx, "sample_fmts", (uint8_t)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt), AV_OPT_SEARCH_CHILDREN); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n"); goto end; } ret = av_opt_set_bin(buffersink_ctx, "channel_layouts", (uint8_t)&enc_ctx->channel_layout, sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n"); goto end; } ret = av_opt_set_bin(buffersink_ctx, "sample_rates", (uint8_t)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate), AV_OPT_SEARCH_CHILDREN); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n"); goto end; } } else { ret = AVERROR_UNKNOWN; goto end; } / Endpoints for the filter graph. / outputs->name = av_strdup("in"); outputs->filter_ctx = buffersrc_ctx; outputs->pad_idx = 0; outputs->next = NULL; inputs->name = av_strdup("out"); inputs->filter_ctx = buffersink_ctx; inputs->pad_idx = 0; inputs->next = NULL; if (!outputs->name || !inputs->name) { ret = AVERROR(ENOMEM); goto end; } if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec, &inputs, &outputs, NULL)) < 0) goto end; if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) goto end; / Fill FilteringContext / fctx->buffersrc_ctx = buffersrc_ctx; fctx->buffersink_ctx = buffersink_ctx; fctx->filter_graph = filter_graph; end: avfilter_inout_free(&inputs); avfilter_inout_free(&outputs); return ret; } static int init_filters(void) { const char filter_spec; unsigned int i; int ret; filter_ctx = av_malloc_array(ifmt_ctx->nb_streams, sizeof(filter_ctx)); if (!filter_ctx) return AVERROR(ENOMEM); for (i = 0; i < ifmt_ctx->nb_streams; i++) { filter_ctx[i].buffersrc_ctx = NULL; filter_ctx[i].buffersink_ctx = NULL; filter_ctx[i].filter_graph = NULL; if (!(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)) continue; if (ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) filter_spec = "null"; / passthrough (dummy) filter for video / else filter_spec = "anull"; / passthrough (dummy) filter for audio / ret = init_filter(&filter_ctx[i], stream_ctx[i].dec_ctx, stream_ctx[i].enc_ctx, filter_spec); if (ret) return ret; } return 0; } static int encode_write_frame(AVFrame filt_frame, unsigned int stream_index, int got_frame) { int ret; int got_frame_local; AVPacket enc_pkt; int (enc_func)(AVCodecContext , AVPacket , const AVFrame , int ) = (ifmt_ctx->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2; if (!got_frame) got_frame = &got_frame_local; av_log(NULL, AV_LOG_INFO, "Encoding frame\n"); / encode filtered frame / enc_pkt.data = NULL; enc_pkt.size = 0; av_init_packet(&enc_pkt); ret = enc_func(stream_ctx[stream_index].enc_ctx, &enc_pkt, filt_frame, got_frame); av_frame_free(&filt_frame); if (ret < 0) return ret; if (!(got_frame)) return 0; / prepare packet for muxing / enc_pkt.stream_index = stream_index; av_packet_rescale_ts(&enc_pkt, stream_ctx[stream_index].enc_ctx->time_base, ofmt_ctx->streams[stream_index]->time_base); av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n"); / mux encoded frame / ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt); return ret; } static int filter_encode_write_frame(AVFrame frame, unsigned int stream_index) { int ret; AVFrame filt_frame; av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n"); / push the decoded frame into the filtergraph / ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx, frame, 0); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n"); return ret; } / pull filtered frames from the filtergraph / while (1) { filt_frame = av_frame_alloc(); if (!filt_frame) { ret = AVERROR(ENOMEM); break; } av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n"); ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx, filt_frame); if (ret < 0) { /* if no more frames for output - returns AVERROR(EAGAIN)
• if flushed and no more frames for output - returns AVERROR_EOF

• rewrite retcode to 0 to show it as normal procedure completion */ if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) ret = 0; av_frame_free(&filt_frame); break; } filt_frame->pict_type = AV_PICTURE_TYPE_NONE; ret = encode_write_frame(filt_frame, stream_index, NULL); if (ret < 0) break; } return ret; } static int flush_encoder(unsigned int stream_index) { int ret; int got_frame; if (!(stream_ctx[stream_index].enc_ctx->codec->capabilities & AV_CODEC_CAP_DELAY)) return 0; while (1) { av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index); ret = encode_write_frame(NULL, stream_index, &got_frame); if (ret < 0) break; if (!got_frame) return 0; } return ret; }

  • (void) convertingVideoFilePath:(NSString ) inputPath saveTo:(NSString )outputPath onProgress:(onProgress)onprogress onComplete:(void(^)(BOOL complete))oncomplete { int ret; AVPacket packet = { .data = NULL, .size = 0 }; AVFrame frame = NULL; enum AVMediaType type; unsigned int stream_index; unsigned int i; int got_frame; int (dec_func)(AVCodecContext , AVFrame , int , const AVPacket ); av_register_all(); avcodec_register_all(); avfilter_register_all();

  if ((ret = open_input_file([inputPath UTF8String])) < 0) goto end; if ((ret = open_output_file([outputPath UTF8String])) < 0) goto end; if ((ret = init_filters()) < 0) goto end; / read all packets / while (1) { if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0) break; stream_index = packet.stream_index; type = ifmt_ctx->streams[packet.stream_index]->codecpar->codec_type; av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n", stream_index); if (filter_ctx[stream_index].filter_graph) { av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n"); frame = av_frame_alloc(); if (!frame) { ret = AVERROR(ENOMEM); break; } av_packet_rescale_ts(&packet, ifmt_ctx->streams[stream_index]->time_base, stream_ctx[stream_index].dec_ctx->time_base); dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 : avcodec_decode_audio4; ret = dec_func(stream_ctx[stream_index].dec_ctx, frame, &got_frame, &packet); if (ret < 0) { av_frame_free(&frame); av_log(NULL, AV_LOG_ERROR, "Decoding failed\n"); break; } if (got_frame) { frame->pts = frame->best_effort_timestamp; ret = filter_encode_write_frame(frame, stream_index); av_frame_free(&frame); if (ret < 0) goto end; } else { av_frame_free(&frame); } } else { / remux this frame without reencoding / av_packet_rescale_ts(&packet, ifmt_ctx->streams[stream_index]->time_base, ofmt_ctx->streams[stream_index]->time_base); ret = av_interleaved_write_frame(ofmt_ctx, &packet); if (ret < 0) goto end; } av_packet_unref(&packet); } / flush filters and encoders / for (i = 0; i < ifmt_ctx->nb_streams; i++) { / flush filter / if (!filter_ctx[i].filter_graph) continue; ret = filter_encode_write_frame(NULL, i); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n"); goto end; } / flush encoder / ret = flush_encoder(i); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n"); goto end; } } av_write_trailer(ofmt_ctx); end: av_packet_unref(&packet); av_frame_free(&frame); for (i = 0; i < ifmt_ctx->nb_streams; i++) { avcodec_free_context(&stream_ctx[i].dec_ctx); if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && stream_ctx[i].enc_ctx) avcodec_free_context(&stream_ctx[i].enc_ctx); if (filter_ctx && filter_ctx[i].filter_graph) avfilter_graph_free(&filter_ctx[i].filter_graph); } av_free(filter_ctx); av_free(stream_ctx); avformat_close_input(&ifmt_ctx); if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) avio_closep(&ofmt_ctx->pb); avformat_free_context(ofmt_ctx); if (ret < 0) av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret));

  if (ret < 0) { NSLog(@"* video conversion Fail to convert"); oncomplete(false); }else { NSLog(@"*** video conversion Success"); oncomplete(true); }

}

@end `

[kewlbear]

You should log failing codec info and verify it is available. You may need to rebuild FFmpeg with more external libraries and/or configure options.

[ViswanathB84]

I rebuilded FFmpeg libraries and below libraries using for conversion but Still it is failing. libavcodec.a libavdevice.a libavfilter.a libavformat.a libavresample.a libavutil.a libfdk-aac.a libpostproc.a libswresample.a libswscale.a libx264.a Would you please suggest which external libraries or configure I need to use it for conversion.