Merge pull request #972 from SteveGilvarry/h264_fixes

feature-h264-videostorage compile fixes and some cleanup.

distros/ubuntu1204/changelog

@@ -5,6 +5,11 @@ zoneminder (1.28.1+1-trusty-SNAPSHOT2015071501) trusty; urgency=medium
   * version upgraded to .100
 
  -- Isaac Connor <iconnor@connortechnology.com>  Wed, 15 Jul 2015 11:56:28 -0400
+zoneminder (1.28.1+1-trusty-SNAPSHOT2015030201ubuntu1) UNRELEASED; urgency=medium
+
+  * add h264
+
+ -- Isaac Connor <iconnor@connortechnology.com>  Fri, 27 Mar 2015 10:08:27 -0400
 
 zoneminder (1.28.1+1-trusty-SNAPSHOT2015030201) trusty; urgency=medium
 

src/zm_ffmpeg.cpp

@@ -232,3 +232,81 @@ int SWScale::ConvertDefaults(const uint8_t* in_buffer, const size_t in_buffer_si
 #endif // HAVE_LIBSWSCALE && HAVE_LIBAVUTIL
 
 #endif // HAVE_LIBAVCODEC || HAVE_LIBAVUTIL || HAVE_LIBSWSCALE
+
+#if HAVE_LIBAVUTIL
+int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts,  AVRational fs_tb, int duration, int64_t *last, AVRational out_tb){
+    int64_t a, b, this_thing;
+
+    av_assert0(in_ts != AV_NOPTS_VALUE);
+    av_assert0(duration >= 0);
+
+    if (*last == AV_NOPTS_VALUE || !duration || in_tb.num*(int64_t)out_tb.den <= out_tb.num*(int64_t)in_tb.den) {
+simple_round:
+        *last = av_rescale_q(in_ts, in_tb, fs_tb) + duration;
+        return av_rescale_q(in_ts, in_tb, out_tb);
+    }
+
+    a =  av_rescale_q_rnd(2*in_ts-1, in_tb, fs_tb, AV_ROUND_DOWN)   >>1;
+    b = (av_rescale_q_rnd(2*in_ts+1, in_tb, fs_tb, AV_ROUND_UP  )+1)>>1;
+    if (*last < 2*a - b || *last > 2*b - a)
+        goto simple_round;
+
+   this_thing = av_clip64(*last, a, b);
+    *last = this_thing + duration;
+
+    return av_rescale_q(this_thing, fs_tb, out_tb);
+}
+#endif
+
+int hacked_up_context2_for_older_ffmpeg(AVFormatContext **avctx, AVOutputFormat *oformat, const char *format, const char *filename) {
+    AVFormatContext *s = avformat_alloc_context();
+    int ret = 0;
+
+    *avctx = NULL;
+    if (!s) {
+		av_log(s, AV_LOG_ERROR, "Out of memory\n");
+		ret = AVERROR(ENOMEM);
+		return ret;
+    }
+
+    if (!oformat) {
+        if (format) {
+            oformat = av_guess_format(format, NULL, NULL);
+            if (!oformat) {
+                av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not a suitable output format\n", format);
+                ret = AVERROR(EINVAL);
+            }
+        } else {
+            oformat = av_guess_format(NULL, filename, NULL);
+            if (!oformat) {
+                ret = AVERROR(EINVAL);
+                av_log(s, AV_LOG_ERROR, "Unable to find a suitable output format for '%s'\n", filename);
+            }
+        }
+    }
+
+    if (ret) {
+		avformat_free_context(s);
+		return ret;
+    } else {
+		s->oformat = oformat;
+		if (s->oformat->priv_data_size > 0) {
+			s->priv_data = av_mallocz(s->oformat->priv_data_size);
+			if (s->priv_data) {
+				if (s->oformat->priv_class) {
+					*(const AVClass**)s->priv_data= s->oformat->priv_class;
+					av_opt_set_defaults(s->priv_data);
+				}
+			} else {
+				av_log(s, AV_LOG_ERROR, "Out of memory\n");
+				ret = AVERROR(ENOMEM);
+			   return ret;
+			}
+			s->priv_data = NULL;
+		}
+
+		if (filename) strncpy(s->filename, filename, sizeof(s->filename));
+		*avctx = s;
+		return 0;
+	}
+}

src/zm_ffmpeg.h

@@ -29,6 +29,7 @@ extern "C" {
 
 // AVUTIL
 #if HAVE_LIBAVUTIL_AVUTIL_H
+#include "libavutil/avassert.h"
 #include <libavutil/avutil.h>
 #include <libavutil/base64.h>
 #include <libavutil/mathematics.h>
@@ -232,4 +233,34 @@ protected:
 
 #endif // ( HAVE_LIBAVUTIL_AVUTIL_H || HAVE_LIBAVCODEC_AVCODEC_H || HAVE_LIBAVFORMAT_AVFORMAT_H || HAVE_LIBAVDEVICE_AVDEVICE_H )
 
+#ifndef avformat_alloc_output_context2
+int hacked_up_context2_for_older_ffmpeg(AVFormatContext **avctx, AVOutputFormat *oformat, const char *format, const char *filename);
+#define avformat_alloc_output_context2(x,y,z,a) hacked_up_context2_for_older_ffmpeg(x,y,z,a)
+#endif
+
+#ifndef av_rescale_delta
+/**
+ * Rescale a timestamp while preserving known durations.
+ */
+int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts,  AVRational fs_tb, int duration, int64_t *last, AVRational out_tb);
+#endif
+
+#ifndef av_clip64
+/**
+ * Clip a signed 64bit integer value into the amin-amax range.
+ * @param a value to clip
+ * @param amin minimum value of the clip range
+ * @param amax maximum value of the clip range
+ * @return clipped value
+ */
+static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
+{
+    if      (a < amin) return amin;
+    else if (a > amax) return amax;
+    else               return a;
+}
+
+#define av_clip64        av_clip64_c
+#endif
+
 #endif // ZM_FFMPEG_H

src/zm_videostore.cpp

@@ -2,6 +2,7 @@
 // ZoneMinder Video Storage Implementation
 // Written by Chris Wiggins
 // http://chriswiggins.co.nz
+// Modification by Steve Gilvarry
 //
 // This program is free software; you can redistribute it and/or
 // modify it under the terms of the GNU General Public License
@@ -28,186 +29,86 @@ extern "C"{
 #include "libavutil/time.h"
 }
 
-#if LIBAVCODEC_VERSION_MAJOR < 54
+VideoStore::VideoStore(const char *filename_in, const char *format_in,
+                       AVStream *input_st, AVStream *inpaud_st,
+                       int64_t nStartTime) {
     
-#define avformat_alloc_output_context2(x,y,z,a) hacked_up_context2_for_older_ffmpeg(x,y,z,a)
-#define av_err2str(x) ""
-
-int hacked_up_context2_for_older_ffmpeg(AVFormatContext **avctx, AVOutputFormat *oformat,
-                                   const char *format, const char *filename)
-{
-    AVFormatContext *s = avformat_alloc_context();
-    int ret = 0;
-
-    *avctx = NULL;
-    if (!s)
-    {
-	av_log(s, AV_LOG_ERROR, "Out of memory\n");
-	ret = AVERROR(ENOMEM);
-	return ret;
-    }
-
-    if (!oformat) {
-        if (format) {
-            oformat = av_guess_format(format, NULL, NULL);
-            if (!oformat) {
-                av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not a suitable output format\n", format);
-                ret = AVERROR(EINVAL);
-            }
-        } else {
-            oformat = av_guess_format(NULL, filename, NULL);
-            if (!oformat) {
-                ret = AVERROR(EINVAL);
-                av_log(s, AV_LOG_ERROR, "Unable to find a suitable output format for '%s'\n",
-                       filename);
-            }
-        }
-    }
-
-    if (ret)
-    {
-	avformat_free_context(s);
-	return ret;
-    } else
-    {
-	s->oformat = oformat;
-	if (s->oformat->priv_data_size > 0) {
-	    s->priv_data = av_mallocz(s->oformat->priv_data_size);
-        if (s->priv_data)
-        {
-	    if (s->oformat->priv_class) {
-		*(const AVClass**)s->priv_data= s->oformat->priv_class;
-		av_opt_set_defaults(s->priv_data);
-	    }
-	} else
-	{
-	    av_log(s, AV_LOG_ERROR, "Out of memory\n");
-	    ret = AVERROR(ENOMEM);
-	   return ret;
-	}
-        s->priv_data = NULL;
-    }
-
-
-    if (filename)
-        strncpy(s->filename, filename, sizeof(s->filename));
-    *avctx = s;
-    return 0;
-   }
-}
-#endif
-
-VideoStore::VideoStore(const char *filename_in, const char *format_in, AVStream *input_st, AVStream *inpaud_st, int64_t nStartTime){
-    
-    //see http://stackoverflow.com/questions/17592120/ffmpeg-how-to-copy-codec-video-and-audio-from-mp4-container-to-ts-cont
-    //see https://www.ffmpeg.org/doxygen/trunk/remuxing_8c-example.html#a41
     //store inputs in variables local to class
-	filename = filename_in;//FIXME hmm
+    filename = filename_in;
-	format = format_in;//FIXME hmm
+    format = format_in;
     
     keyframeMessage = false;
     keyframeSkipNumber = 0;
-    char szErr[1024];
 
-	Info("Opening video storage stream %s\n", filename);
+    Info("Opening video storage stream %s\n", filename);
 
-	//Init everything we need
+    //Init everything we need
-	int ret;
+    int ret;
-	av_register_all();
+    av_register_all();
 
-	//AVOutputFormat *outfmt = av_guess_format(NULL,filename,NULL);
+    //Allocate the output media context based on the filename of the context
+    avformat_alloc_output_context2(&oc, NULL, NULL, filename);
         
-	//Allocate the output media context based on the filename of the context
+    //Couldn't deduce format from filename, trying from format name
-	avformat_alloc_output_context2(&oc, NULL, NULL, filename);
+    if (!oc) {
-    
+        avformat_alloc_output_context2(&oc, NULL, format, filename);
-	//Couldn't deduce format from filename, trying from format name
+        if (!oc) {
-	if(!oc){
+            Fatal("Could not create video storage stream %s as no output context"
-		avformat_alloc_output_context2(&oc, NULL, format, filename);
+                  " could not be assigned based on filename or format %s",
-	}
+                    filename, format);
-    
-	//Couldn't deduce format from filename, using MPEG
-	if(!oc){
-		Error("Couldn't deduce format from filename, using MPEG");
-		avformat_alloc_output_context2(&oc, NULL, format, filename);
-	}
-    
-	if(!oc){
-		Fatal("No output context was assigned...");
-	}
-    
-	fmt = oc->oformat;
-    
-   /* AVCodec *out_vid_codec,*out_aud_codec;
-    out_vid_codec = out_aud_codec = NULL;
-    //create a new video stream based on the incoming stream from the camera and copy the context across
-    if(outfmt){//FIXME what if we failed
-        out_vid_codec = avcodec_find_encoder(outfmt->video_codec);//what exactly are we doing here all we have is something based on the filename which if it is a container doesnt imply a codec?
-        out_aud_codec = avcodec_find_encoder(outfmt->audio_codec);//what exactly are we doing here all we have is something based on the filename which if it is a container doesnt imply a codec?
-    } else
-        Fatal("Unable to guess output format\n");*/
-    
-    video_st = avformat_new_stream(oc, /*out_vid_codec?out_vid_codec:*/input_st->codec->codec);
-    if(video_st){ //FIXME handle failures
-        ret=avcodec_copy_context(video_st->codec, input_st->codec);
-        if(ret==0){
-            /*int m_fps=25;//FIXME doesn't say where to get this from?
-            video_st->sample_aspect_ratio.den = input_st->codec->sample_aspect_ratio.den;
-            video_st->sample_aspect_ratio.num = input_st->codec->sample_aspect_ratio.num;
-            video_st->codec->codec_id = input_st->codec->codec_id;
-            video_st->codec->time_base.num = 1;
-            video_st->codec->time_base.den = m_fps*(input_st->codec->ticks_per_frame);         
-            video_st->time_base.num = 1;
-            video_st->time_base.den = 1000;
-            video_st->r_frame_rate.num = m_fps;
-            video_st->r_frame_rate.den = 1;
-            video_st->avg_frame_rate.den = 1;
-            video_st->avg_frame_rate.num = m_fps;
-            //video_st->duration = (m_out_end_time - m_out_start_time)*1000;//FIXME what the hell do i put here*/
-        } else 
-            Fatal("Unable to copy video context %s\n", av_make_error_string(szErr,1024,ret));
-        video_st->codec->codec_tag = 0;
-        if (oc->oformat->flags & AVFMT_GLOBALHEADER)
-            video_st->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
-    } else
-        Fatal("Unable to create video out stream\n");
-    
-    if(inpaud_st){
-        audio_st = avformat_new_stream(oc, /*out_aud_codec?out_aud_codec:*/inpaud_st->codec->codec);
-        if(audio_st){//FIXME failure?
-            ret=avcodec_copy_context(audio_st->codec, inpaud_st->codec);
-            if(ret==0){ //FIXME failure?
-              /*  audio_st->codec->codec_id = inpaud_st->codec->codec_id;
-                audio_st->codec->codec_tag = 0;
-                audio_st->pts = inpaud_st->pts;
-                audio_st->duration = inpaud_st->duration;
-                audio_st->time_base.num = inpaud_st->time_base.num;
-                audio_st->time_base.den = inpaud_st->time_base.den;*/
-            } else
-                Fatal("Unable to copy audio context %s\n", av_make_error_string(szErr,1024,ret));
-            audio_st->codec->codec_tag = 0;
-            if (oc->oformat->flags & AVFMT_GLOBALHEADER)
-                audio_st->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
-        } else
-            Fatal("Unable to create audio out stream\n");
-    }else{
-        audio_st = NULL;
-    }    
-    
-	//av_dump_format(oc, 0, filename, 1);
-    
-	/* open the output file, if needed */
-    if (!(fmt->flags & AVFMT_NOFILE)) {
-        ret = avio_open2(&oc->pb, filename, AVIO_FLAG_WRITE,NULL,NULL);
-        if (ret < 0) {
-            Fatal("Could not open '%s': %s\n", filename, av_make_error_string(szErr,1024,ret));
         }
     }
         
-	/* Write the stream header, if any. */
+    fmt = oc->oformat;
-	ret = avformat_write_header(oc, NULL);
+    
-	if (ret < 0) {
+    video_st = avformat_new_stream(oc, input_st->codec->codec);
-		Fatal("Error occurred when opening output file: %s\n", av_make_error_string(szErr,1024,ret));
+    if (!video_st) {
-	}
+        Fatal("Unable to create video out stream\n");
+    }
+    
+    ret = avcodec_copy_context(video_st->codec, input_st->codec);
+    if (ret < 0) { 
+        Fatal("Unable to copy input video context to output video context "
+              "%s\n", av_make_error_string(ret).c_str());
+        }
+
+    video_st->codec->codec_tag = 0;
+    if (oc->oformat->flags & AVFMT_GLOBALHEADER) {
+        video_st->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
+    }
+    
+    if (inpaud_st) {
+        audio_st = avformat_new_stream(oc, inpaud_st->codec->codec);
+        if (!audio_st) {
+                Fatal("Unable to create audio out stream\n");
+        }
+        ret=avcodec_copy_context(audio_st->codec, inpaud_st->codec);
+        if (ret < 0) {
+            Fatal("Unable to copy audio context %s\n", av_make_error_string(ret).c_str());
+        }   
+        audio_st->codec->codec_tag = 0;
+        if (oc->oformat->flags & AVFMT_GLOBALHEADER) {
+            audio_st->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
+        }
+    } else {
+        audio_st = NULL;
+    }    
+
+    /* open the output file, if needed */
+    if (!(fmt->flags & AVFMT_NOFILE)) {
+        ret = avio_open2(&oc->pb, filename, AVIO_FLAG_WRITE,NULL,NULL);
+        if (ret < 0) {
+            Fatal("Could not open output file '%s': %s\n", filename,
+                    av_make_error_string(ret).c_str());
+        }
+    }
+    
+    /* Write the stream header, if any. */
+    ret = avformat_write_header(oc, NULL);
+    if (ret < 0) {
+            Fatal("Error occurred when writing output file header: %s\n",
+                    av_make_error_string(ret).c_str());
+    }
     
     startPts = 0;
     startDts = 0;
@@ -218,105 +119,32 @@ VideoStore::VideoStore(const char *filename_in, const char *format_in, AVStream
 }
 
 VideoStore::~VideoStore(){
-    /* Write the trailer, if any. The trailer must be written before you
+    /* Write the trailer before close */
-     * close the CodecContexts open when you wrote the header; otherwise
-     * av_write_trailer() may try to use memory that was freed on
-     * av_codec_close(). */
     av_write_trailer(oc);
     
     avcodec_close(video_st->codec);
-    if (audio_st)
+    if (audio_st) {
         avcodec_close(audio_st->codec);
+    }
     
-    if (!(fmt->flags & AVFMT_NOFILE))
+    if (!(fmt->flags & AVFMT_NOFILE)) {
     /* Close the output file. */
         avio_close(oc->pb);
+    }
     
     /* free the stream */
     avformat_free_context(oc);
 }
 
 int VideoStore::writeVideoFramePacket(AVPacket *ipkt, AVStream *input_st){//, AVPacket *lastKeyframePkt){
-    /*
-     See 01349 of http://www.ffmpeg.org/doxygen/trunk/ffmpeg_8c-source.html
-     do_streamcopy
-     */
 
-  /*  if(!keyframeMessage) //video should only be split on key frame now
-    {
-        if(!video_st->nb_frames && !(ipkt->flags & AV_PKT_FLAG_KEY))//FIXME relavence ... video_st->nb_frames 
-            return -1;
-        keyframeMessage=true;
-        if (ipkt->pts != AV_NOPTS_VALUE)
-            startPts = ipkt->pts;
-        else
-            startPts = 0;
-        
-        if (ipkt->dts != AV_NOPTS_VALUE)
-            startDts = ipkt->dts;
-        else
-            startDts = 0;
-    }*/
-     
-    char szErr[1024];
     int64_t ost_tb_start_time = av_rescale_q(startTime, AV_TIME_BASE_Q, video_st->time_base);
      
     AVPacket opkt;
-    AVPicture pict;//Not sure how much we need this
+    AVPicture pict;
     
     av_init_packet(&opkt);
     
-    //Wait for a keyframe to show up or use
-  /*  if (!video_st->nb_frames && !(ipkt->flags & AV_PKT_FLAG_KEY)){
-        if(!keyframeMessage && (lastKeyframePkt->flags & AV_PKT_FLAG_KEY)){
-            int64_t tmpPts = ipkt->pts;
-            int64_t tmpDts = ipkt->dts;
-            av_copy_packet(ipkt, lastKeyframePkt);
-            ipkt->pts = tmpPts;
-            ipkt->dts = tmpDts;
-            Info("Used buffered keyframe as first frame");
-            
-            if (ipkt->pts != AV_NOPTS_VALUE)
-                startPts = ipkt->pts;
-            else
-                startPts = 0;
-            
-            if (ipkt->dts != AV_NOPTS_VALUE)
-                startDts = ipkt->pts;
-            else
-                startDts = 0;
-            
-        
-        } else if(!keyframeMessage){
-            Warning("Waiting for keyframe before starting recording");
-            keyframeMessage = true;
-        }
-        
-        if(keyframeMessage){
-            keyframeSkipNumber++;
-            return -1;//FIXME bad opkt not freed
-        }
-
-    }else{
-        if(keyframeMessage){
-            Warning("Skipped %d frames waiting for keyframe", keyframeSkipNumber);
-            keyframeMessage = false;
-            
-            if (ipkt->pts != AV_NOPTS_VALUE)
-                startPts = ipkt->pts;
-            else
-                startPts = 0;
-            
-            if (ipkt->dts != AV_NOPTS_VALUE)
-                startDts = ipkt->pts;
-            else
-                startDts = 0;
-        }
-    }*/
-
-    
-    //opkt.stream_index = video_st->index;
-    
     //Scale the PTS of the outgoing packet to be the correct time base
     if (ipkt->pts != AV_NOPTS_VALUE)
         opkt.pts = av_rescale_q(ipkt->pts-startPts, input_st->time_base, video_st->time_base) - ost_tb_start_time;
@@ -334,9 +162,6 @@ int VideoStore::writeVideoFramePacket(AVPacket *ipkt, AVStream *input_st){//, AV
     opkt.flags = ipkt->flags;
     opkt.pos=-1;
 
-    //TODO: Should be checking if not H264, mpeg1, etc
-    //Maybe the check isn't needed if we're only going to do this for H264 video incoming
-    
     opkt.data = ipkt->data;
     opkt.size = ipkt->size;
     opkt.stream_index = ipkt->stream_index;
@@ -344,7 +169,6 @@ int VideoStore::writeVideoFramePacket(AVPacket *ipkt, AVStream *input_st){//, AV
     
     if (video_st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (fmt->flags & AVFMT_RAWPICTURE)) {
         /* store AVPicture in AVPacket, as expected by the output format */
-        //Info("Raw picture storage");
         avpicture_fill(&pict, opkt.data, video_st->codec->pix_fmt, video_st->codec->width, video_st->codec->height);
         opkt.data = (uint8_t *)&pict;
         opkt.size = sizeof(AVPicture);
@@ -355,7 +179,7 @@ int VideoStore::writeVideoFramePacket(AVPacket *ipkt, AVStream *input_st){//, AV
     int ret;
     ret = av_interleaved_write_frame(oc, &opkt);
     if(ret<0){
-        Fatal("Error encoding video frame packet: %s\n", av_make_error_string(szErr,1024,ret));
+        Fatal("Error encoding video frame packet: %s\n", av_make_error_string(ret).c_str());
     }
     
     av_free_packet(&opkt);
@@ -364,25 +188,19 @@ int VideoStore::writeVideoFramePacket(AVPacket *ipkt, AVStream *input_st){//, AV
 }
 
 int VideoStore::writeAudioFramePacket(AVPacket *ipkt, AVStream *input_st){
-    /*
+
-     See 01349 of http://www.ffmpeg.org/doxygen/trunk/ffmpeg_8c-source.html
-     do_streamcopy
-     */
     if(!audio_st)
         return -1;//FIXME -ve return codes do not free packet in ffmpeg_camera at the moment
     /*if(!keyframeMessage)
         return -1;*/
         
-    char szErr[1024];
     int64_t ost_tb_start_time = av_rescale_q(startTime, AV_TIME_BASE_Q, video_st->time_base);
         
     AVPacket opkt;
     
     av_init_packet(&opkt);
 
-    //opkt.stream_index = audio_st->index;
     
-    //FIXME does the PTS/DTS code below still apply to our audio the same way?
     //Scale the PTS of the outgoing packet to be the correct time base
     if (ipkt->pts != AV_NOPTS_VALUE)
         opkt.pts = av_rescale_q(ipkt->pts-startPts, input_st->time_base, audio_st->time_base) - ost_tb_start_time;
@@ -402,6 +220,7 @@ int VideoStore::writeAudioFramePacket(AVPacket *ipkt, AVStream *input_st){
              duration = input_st->codec->frame_size;
              
         //FIXME where to get filter_in_rescale_delta_last
+		//FIXME av_rescale_delta doesn't exist in ubuntu vivid libavtools
         opkt.dts = opkt.pts = av_rescale_delta(input_st->time_base, ipkt->dts,
                                                 (AVRational){1, input_st->codec->sample_rate}, duration, &filter_in_rescale_delta_last,
                                                 audio_st->time_base) - ost_tb_start_time;
@@ -411,9 +230,6 @@ int VideoStore::writeAudioFramePacket(AVPacket *ipkt, AVStream *input_st){
     opkt.pos=-1;
     opkt.flags = ipkt->flags;
     
-    //TODO: Should be checking if not H264, mpeg1, etc
-    //Maybe the check isn't needed if we're only going to do this for H264 video incoming
-    
     opkt.data = ipkt->data;
     opkt.size = ipkt->size;
     opkt.stream_index = ipkt->stream_index;
@@ -422,148 +238,9 @@ int VideoStore::writeAudioFramePacket(AVPacket *ipkt, AVStream *input_st){
     int ret;
     ret = av_interleaved_write_frame(oc, &opkt);
     if(ret<0){
-        Fatal("Error encoding audio frame packet: %s\n", av_make_error_string(szErr,1024,ret));
+        Fatal("Error encoding audio frame packet: %s\n", av_make_error_string(ret).c_str());
     }
     
     av_free_packet(&opkt);
     return 0;
 }
-
-
-/*
-
-// Duration of one frame in AV_TIME_BASE units
-int64_t timeBase;
-
-void open(const char* fpath){
-    ...
-    timeBase = (int64_t(pCodecCtx->time_base.num) * AV_TIME_BASE) / int64_t(pCodecCtx->time_base.den);
-    ...
-}
-
-bool seek(int frameIndex){
-
-    if(!pFormatCtx)
-        return false;
-
-    int64_t seekTarget = int64_t(frameIndex) * timeBase;
-
-    if(av_seek_frame(pFormatCtx, -1, seekTarget, AVSEEK_FLAG_ANY) < 0)
-        mexErrMsgTxt("av_seek_frame failed.");
-}
-
-void saveFrame(const AVFrame* frame, int width, int height, int frameNumber)
-{
-    char filename[32];
-    sprintf(filename, "frame%d.ppm", frameNumber);
-    std::ofstream file(filename, std::ios_base::binary | std::ios_base::trunc | std::ios_base::out);
-
-    if (!file.good())
-    {
-        throw std::runtime_error("Unable to open the file to write the frame");
-    }
-
-    file << "P5\n" << width << '\n' << height << "\n255\n";
-
-    for (int i = 0; i < height; ++i)
-    {
-        file.write((char*)(frame->data[0] + i * frame->linesize[0]), width);
-    }
-}
-
-int main()
-{
-    av_register_all();
-    AVFrame* frame = avcodec_alloc_frame();
-    if (!frame)
-    {
-        return 1;
-    }
-
-    AVFormatContext* formatContext = NULL;
-    if (avformat_open_input(&formatContext, "mpeg2.mov", NULL, NULL) != 0)
-    {
-        av_free(frame);
-        return 1;
-    }
-
-    if (avformat_find_stream_info(formatContext, NULL) < 0)
-    {
-        av_free(frame);
-        av_close_input_file(formatContext);
-        return 1;
-    }
-
-    if (formatContext->nb_streams < 1 || formatContext->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
-    {
-        av_free(frame);
-        av_close_input_file(formatContext);
-        return 1;
-    }
-
-    AVStream* stream = formatContext->streams[0];
-    AVCodecContext* codecContext = stream->codec;
-
-    codecContext->codec = avcodec_find_decoder(codecContext->codec_id);
-    if (codecContext->codec == NULL)
-    {
-        av_free(frame);
-        avcodec_close(codecContext);
-        av_close_input_file(formatContext);
-        return 1;
-    }
-    else if (avcodec_open2(codecContext, codecContext->codec, NULL) != 0)
-    {
-        av_free(frame);
-        avcodec_close(codecContext);
-        av_close_input_file(formatContext);
-        return 1;
-    }
-
-    avcodec_flush_buffers(codecContext);
-    
-    std::cout << "Seek successful? " << (av_seek_frame(formatContext, -1, 0, AVSEEK_FLAG_BACKWARD) >= 0) << std::endl;
-
-    AVPacket packet;
-    av_init_packet(&packet);
-
-    std::ofstream stats("stats.txt");
-
-    int frameNumber = 0;
-    while (av_read_frame(formatContext, &packet) == 0)
-    {
-        std::cout << "key packet? " << (packet.flags & AV_PKT_FLAG_KEY) << std::endl;
-        if (packet.stream_index == stream->index)
-        {
-            int frameFinished = 0;
-            avcodec_decode_video2(codecContext, frame, &frameFinished, &packet);
-
-            if (frameFinished)
-            {
-                saveFrame(frame, codecContext->width, codecContext->height, frameNumber++);
-                stats << "repeat: " << frame->repeat_pict << "\tkeyframe: " << frame->key_frame << "\tbest_ts: " << frame->best_effort_timestamp << '\n';
-            }
-        }
-    }
-    
-    av_free_packet(&packet);
-
-    if (codecContext->codec->capabilities & CODEC_CAP_DELAY)
-    {
-        av_init_packet(&packet);
-        int frameFinished = 0;
-        int result = 0;
-        while ((result = avcodec_decode_video2(codecContext, frame, &frameFinished, &packet)) >= 0 && frameFinished)
-        {
-            if (frameFinished)
-            {
-                saveFrame(frame, codecContext->width, codecContext->height, frameNumber++);
-                stats << "repeat: " << frame->repeat_pict << "\tkeyframe: " << frame->key_frame << "\tbest_ts: " << frame->best_effort_timestamp << '\n';
-            }
-        }
-    }
-
-    av_free(frame);
-    avcodec_close(codecContext);
-    av_close_input_file(formatContext);
-}*/