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• How to add subtitles to the encoded video using ffmpeg ?

  14 novembre 2019, par geo-freak

  I am trying to add my srt file to the video using the options which were answered here before. My input file has captions in it by default. I tried in different ways to get the captions enabled in my encoded video. Below are the commands I used.

  ffmpeg  -i input.ts -i captions.srt -b:a 32000 -ar 48000  -force_key_frames 'expr:gte(t,n_forced*3)' -acodec libfaac -hls_flags single_file -hls_list_size 0 -hls_time 3 -vcodec libx264 -s 320x240 -b:v 512000 -maxrate 512000 -c:s mov_text outfile.ts

  But I couldn’t see the captions after I see the mediainfo of the encoded file. You can see the log file of my command.

  [mpegts @ 0x56412e67b0c0] max_analyze_duration 5000000 reached at 5024000 microseconds st:1
  
  input.ts FPS 29.970030 1
  
  Input #0, mpegts, from 'input.ts':
  
    Duration: 00:03:00.07, start: 1.400000, bitrate: 2172 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: mpeg2video (Main), 1 reference frame ([2][0][0][0] / 0x0002), yuv420p(tv), 704x480 [SAR 10:11 DAR 4:3], Closed Captions, max. 15000 kb/s, 
  
  29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:1[0x101](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s
  
  Input #1, srt, from 'captions.srt':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Subtitle: subrip
  
  [graph 0 input from stream 0:0 @ 0x56412e678540] w:704 h:480 pixfmt:yuv420p tb:1/90000 fr:30000/1001 sar:10/11 sws_param:flags=2
  
  [scaler for output stream 0:0 @ 0x56412e9caac0] w:320 h:240 flags:'bicubic' interl:0
  
  [scaler for output stream 0:0 @ 0x56412e9caac0] w:704 h:480 fmt:yuv420p sar:10/11 -> w:320 h:240 fmt:yuv420p sar:1/1 flags:0x4
  
  [graph 1 input from stream 0:1 @ 0x56412e9f74e0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
  
  [audio format for output stream 0:1 @ 0x56412e9f7b40] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format 
  
  for output stream 0:1'                                                                                                                                               
  
  [auto-inserted resampler 0 @ 0x56412e9f9f20] ch:2 chl:stereo fmt:fltp r:48000Hz -> ch:2 chl:stereo fmt:s16 r:48000Hz
  
  [libx264 @ 0x56412e9bb8c0] VBV maxrate specified, but no bufsize, ignored
  
  [libx264 @ 0x56412e9bb8c0] using SAR=1/1
  
  [libx264 @ 0x56412e9bb8c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0x56412e9bb8c0] profile High, level 2.0
  
  [mpegts @ 0x56412e9ba5a0] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt every 40 pkts
  
  Output #0, mpegts, to 'my_encoded_all-3.ts':
  
    Metadata:
  
      encoder         : Lavf57.25.100
  
      Stream #0:0: Video: h264 (libx264), -1 reference frame, yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 512 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc57.24.102 libx264
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
      Stream #0:1(eng): Audio: aac (libfaac), 48000 Hz, stereo, s16, 32 kb/s
  
      Metadata:
  
        encoder         : Lavc57.24.102 libfaac
  
      Stream #0:2(eng): Subtitle: subrip (srt), 320x240
  
          Metadata:
  
            encoder         : Lavc57.24.102 srt
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (libx264))
  
        Stream #0:1 -> #0:1 (ac3 (native) -> aac (libfaac))
  
        Stream #1:0 -> #0:2 (subrip (srt) -> subrip (srt))
  
  Press [q] to stop, [?] for help
  
  [scaler for output stream 0:0 @ 0x56412e9caac0] w:704 h:480 fmt:yuv420p sar:40/33 -> w:320 h:240 fmt:yuv420p sar:4/3 flags:0x4
  
  No more output streams to write to, finishing.e=00:02:58.85 bitrate= 658.4kbits/s speed=13.2x
  
  frame= 5377 fps=385 q=-1.0 Lsize=   16672kB time=00:59:16.18 bitrate=  38.4kbits/s speed= 255x
  
  video:11401kB audio:1410kB subtitle:446kB other streams:0kB global headers:0kB muxing overhead: 25.753614%
  
  Input file #0 (input.ts):
  
    Input stream #0:0 (video): 5380 packets read (40279443 bytes); 5377 frames decoded; 
  
    Input stream #0:1 (audio): 5625 packets read (4320000 bytes); 5625 frames decoded (8640000 samples); 
  
    Total: 11005 packets (44599443 bytes) demuxed
  
  Input file #1 (captions.srt):
  
    Input stream #1:0 (subtitle): 10972 packets read (447147 bytes); 10972 frames decoded; 
  
    Total: 10972 packets (447147 bytes) demuxed
  
  Output file #0 (output.ts):
  
    Output stream #0:0 (video): 5377 frames encoded; 5377 packets muxed (11675098 bytes); 
  
    Output stream #0:1 (audio): 8438 frames encoded (8640000 samples); 8439 packets muxed (1444109 bytes); 
  
    Output stream #0:2 (subtitle): 10972 frames encoded; 10972 packets muxed (456619 bytes); 
  
    Total: 24788 packets (13575826 bytes) muxed
  
  [libx264 @ 0x56412e9bb8c0] frame I:81    Avg QP:15.08  size: 16370
  
  [libx264 @ 0x56412e9bb8c0] frame P:2312  Avg QP:17.77  size:  3393
  
  [libx264 @ 0x56412e9bb8c0] frame B:2984  Avg QP:22.38  size:   839
  
  [libx264 @ 0x56412e9bb8c0] consecutive B-frames: 20.6% 13.2%  9.4% 56.8%
  
  [libx264 @ 0x56412e9bb8c0] mb I  I16..4: 11.6% 37.0% 51.4%
  
  [libx264 @ 0x56412e9bb8c0] mb P  I16..4:  1.2%  3.2%  2.4%  P16..4: 33.7% 18.0% 15.7%  0.0%  0.0%    skip:25.6%
  
  [libx264 @ 0x56412e9bb8c0] mb B  I16..4:  0.2%  0.3%  0.2%  B16..8: 30.7%  9.2%  3.2%  direct: 5.1%  skip:51.1%  L0:33.6% L1:44.5% BI:21.9%
  
  [libx264 @ 0x56412e9bb8c0] final ratefactor: 16.76
  
  [libx264 @ 0x56412e9bb8c0] 8x8 transform intra:43.0% inter:49.8%
  
  [libx264 @ 0x56412e9bb8c0] coded y,uvDC,uvAC intra: 77.9% 85.1% 68.8% inter: 22.9% 21.7% 6.0%
  
  [libx264 @ 0x56412e9bb8c0] i16 v,h,dc,p: 30% 38%  5% 26%
  
  [libx264 @ 0x56412e9bb8c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 23% 18%  4%  5%  7%  6%  7%  8%
  
  [libx264 @ 0x56412e9bb8c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 23% 11%  5%  6%  8%  6%  7%  6%
  
  [libx264 @ 0x56412e9bb8c0] i8c dc,h,v,p: 46% 24% 21%  8%
  
  [libx264 @ 0x56412e9bb8c0] Weighted P-Frames: Y:4.2% UV:2.6%
  
  [libx264 @ 0x56412e9bb8c0] ref P L0: 73.3% 10.9% 11.1%  4.5%  0.1%
  
  [libx264 @ 0x56412e9bb8c0] ref B L0: 92.1%  6.3%  1.6%
  
  [libx264 @ 0x56412e9bb8c0] ref B L1: 97.4%  2.6%

  I found no issues in encoding but I couldn’t see the captions enabled in my output encoded video. I played it in my VLC player. No tracks for subtitles.

  Can’t we add the subtitles to a video while encoding ?

  Any help in achieving this would be appreciated.

• x264 encoded frames into a mp4 container with ffmpeg API

  10 septembre 2019, par PJD

  I'm struggling with understanding what is and what is not needed in getting my already encoded x264 frames into a video container file using ffmpeg's libavformat API.

  



  My current program will get the x264 frames like this -

  



  while( x264_encoder_delayed_frames( h ) )
{
    printf("Writing delayed frame %u\n", delayed_frame_counter++);
    i_frame_size = x264_encoder_encode( h, &nal, &i_nal, NULL, &pic_out );
    if( i_frame_size < 0 ) {
            printf("Failed to encode a delayed x264 frame.\n");
            return ERROR;
        }
    else if( i_frame_size )
    {
        if( !fwrite(nal->p_payload, i_frame_size, 1, video_file_ptr) ) {
            printf("Failed to write a delayed x264 frame.\n");
            return ERROR;
        }
    }
}


  



  If I use the CLI to the ffmpeg binary, I can put these frames into a container using :

  



  ffmpeg -i "raw_frames.h264" -c:v copy -f mp4 "video.mp4"


  



  I would like to code this function into my program using the libavformat API though. I'm a little stuck in the concepts and the order on which each ffmpeg function is needed to be called.

  



  So far I have written :

  



          mAVOutputFormat = av_guess_format("gen_vid.mp4", NULL, NULL);
        printf("Guessed format\n");

        int ret = avformat_alloc_output_context2(&mAVFormatContext, NULL, NULL, "gen_vid.mp4");
        printf("Created context = %d\n", ret);
        printf("Format = %s\n", mAVFormatContext->oformat->name);

        mAVStream = avformat_new_stream(mAVFormatContext, 0);
        if (!mAVStream) {
            printf("Failed allocating output stream\n");
        } else {
            printf("Allocated stream.\n");
        }

        mAVCodecParameters = mAVStream->codecpar;
        if (mAVCodecParameters->codec_type != AVMEDIA_TYPE_AUDIO &&
            mAVCodecParameters->codec_type != AVMEDIA_TYPE_VIDEO &&
            mAVCodecParameters->codec_type != AVMEDIA_TYPE_SUBTITLE) {
            printf("Invalid codec?\n");
        }

        if (!(mAVFormatContext->oformat->flags & AVFMT_NOFILE)) {
            ret = avio_open(&mAVFormatContext->pb, "gen_vid.mp4", AVIO_FLAG_WRITE);
            if (ret < 0) {
              printf("Could not open output file '%s'", "gen_vid.mp4");
            }
          }

        ret = avformat_write_header(mAVFormatContext, NULL);
        if (ret < 0) {
          printf("Error occurred when opening output file\n");
        }


  



  This will print out :

  



  Guessed format
Created context = 0
Format = mp4
Allocated stream.
Invalid codec?
[mp4 @ 0x55ffcea2a2c0] Could not find tag for codec none in stream #0, codec not currently supported in container
Error occurred when opening output file


  



  How can I make sure the codec type is set correctly for my video ?
Next I need to somehow point my mAVStream to use my x264 frames - advice would be great.

  



  Update 1 :
So I've tried to set the H264 codec, so the codec's meta-data is available. I seem to hit 2 newer issues now.
1) It cannot find the device and therefore cannot configure the encoder.
2) I get the "dimensions not set".

  



  mAVOutputFormat = av_guess_format("gen_vid.mp4", NULL, NULL);
printf("Guessed format\n");

// MUST allocate the media file format context. 
int ret = avformat_alloc_output_context2(&mAVFormatContext, NULL, NULL, "gen_vid.mp4");
printf("Created context = %d\n", ret);
printf("Format = %s\n", mAVFormatContext->oformat->name);

// Even though we already have encoded the H264 frames using x264,
// we still need the codec's meta-data.
const AVCodec *mAVCodec;
mAVCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
if (!mAVCodec) {
    fprintf(stderr, "Codec '%s' not found\n", "H264");
    exit(1);
}
mAVCodecContext = avcodec_alloc_context3(mAVCodec);
if (!mAVCodecContext) {
    fprintf(stderr, "Could not allocate video codec context\n");
    exit(1);
}
printf("Codec context allocated with defaults.\n");
/* put sample parameters */
mAVCodecContext->bit_rate = 400000;
mAVCodecContext->width = width;
mAVCodecContext->height = height;
mAVCodecContext->time_base = (AVRational){1, 30};
mAVCodecContext->framerate = (AVRational){30, 1};
mAVCodecContext->gop_size = 10;
mAVCodecContext->level = 31;
mAVCodecContext->max_b_frames = 1;
mAVCodecContext->pix_fmt = AV_PIX_FMT_NV12;

av_opt_set(mAVCodecContext->priv_data, "preset", "slow", 0);
printf("Set codec parameters.\n");

// Initialize the AVCodecContext to use the given AVCodec.
avcodec_open2(mAVCodecContext, mAVCodec, NULL);            

// Add a new stream to a media file. Must be called before
// calling avformat_write_header().
mAVStream = avformat_new_stream(mAVFormatContext, mAVCodec);
if (!mAVStream) {
    printf("Failed allocating output stream\n");
} else {
    printf("Allocated stream.\n");
}

// TODO How should codecpar be set?
mAVCodecParameters = mAVStream->codecpar;
if (mAVCodecParameters->codec_type != AVMEDIA_TYPE_AUDIO &&
    mAVCodecParameters->codec_type != AVMEDIA_TYPE_VIDEO &&
    mAVCodecParameters->codec_type != AVMEDIA_TYPE_SUBTITLE) {
    printf("Invalid codec?\n");
}

if (!(mAVFormatContext->oformat->flags & AVFMT_NOFILE)) {
    ret = avio_open(&mAVFormatContext->pb, "gen_vid.mp4", AVIO_FLAG_WRITE);
    if (ret < 0) {
      printf("Could not open output file '%s'", "gen_vid.mp4");
    }
  }
printf("Called avio_open()\n");

// MUST write a header.
ret = avformat_write_header(mAVFormatContext, NULL);
if (ret < 0) {
  printf("Error occurred when opening output file (writing header).\n");
}


  



  Now I am getting this output -

  



  Guessed format
Created context = 0
Format = mp4
Codec context allocated with defaults.
Set codec parameters.
[h264_v4l2m2m @ 0x556460344b40] Could not find a valid device
[h264_v4l2m2m @ 0x556460344b40] can't configure encoder
Allocated stream.
Invalid codec?
Called avio_open()
[mp4 @ 0x5564603442c0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[mp4 @ 0x5564603442c0] dimensions not set
Error occurred when opening output file (writing header).


  


• x264 encoded frames into a mp4 container with ffmpeg API

  10 septembre 2019, par PJD

  I'm struggling with understanding what is and what is not needed in getting my already encoded x264 frames into a video container file using ffmpeg's libavformat API.

  



  My current program will get the x264 frames like this -

  



  while( x264_encoder_delayed_frames( h ) )
{
    printf("Writing delayed frame %u\n", delayed_frame_counter++);
    i_frame_size = x264_encoder_encode( h, &nal, &i_nal, NULL, &pic_out );
    if( i_frame_size < 0 ) {
            printf("Failed to encode a delayed x264 frame.\n");
            return ERROR;
        }
    else if( i_frame_size )
    {
        if( !fwrite(nal->p_payload, i_frame_size, 1, video_file_ptr) ) {
            printf("Failed to write a delayed x264 frame.\n");
            return ERROR;
        }
    }
}


  



  If I use the CLI to the ffmpeg binary, I can put these frames into a container using :

  



  ffmpeg -i "raw_frames.h264" -c:v copy -f mp4 "video.mp4"


  



  I would like to code this function into my program using the libavformat API though. I'm a little stuck in the concepts and the order on which each ffmpeg function is needed to be called.

  



  So far I have written :

  



          mAVOutputFormat = av_guess_format("gen_vid.mp4", NULL, NULL);
        printf("Guessed format\n");

        int ret = avformat_alloc_output_context2(&mAVFormatContext, NULL, NULL, "gen_vid.mp4");
        printf("Created context = %d\n", ret);
        printf("Format = %s\n", mAVFormatContext->oformat->name);

        mAVStream = avformat_new_stream(mAVFormatContext, 0);
        if (!mAVStream) {
            printf("Failed allocating output stream\n");
        } else {
            printf("Allocated stream.\n");
        }

        mAVCodecParameters = mAVStream->codecpar;
        if (mAVCodecParameters->codec_type != AVMEDIA_TYPE_AUDIO &&
            mAVCodecParameters->codec_type != AVMEDIA_TYPE_VIDEO &&
            mAVCodecParameters->codec_type != AVMEDIA_TYPE_SUBTITLE) {
            printf("Invalid codec?\n");
        }

        if (!(mAVFormatContext->oformat->flags & AVFMT_NOFILE)) {
            ret = avio_open(&mAVFormatContext->pb, "gen_vid.mp4", AVIO_FLAG_WRITE);
            if (ret < 0) {
              printf("Could not open output file '%s'", "gen_vid.mp4");
            }
          }

        ret = avformat_write_header(mAVFormatContext, NULL);
        if (ret < 0) {
          printf("Error occurred when opening output file\n");
        }


  



  This will print out :

  



  Guessed format
Created context = 0
Format = mp4
Allocated stream.
Invalid codec?
[mp4 @ 0x55ffcea2a2c0] Could not find tag for codec none in stream #0, codec not currently supported in container
Error occurred when opening output file


  



  How can I make sure the codec type is set correctly for my video ?
Next I need to somehow point my mAVStream to use my x264 frames - advice would be great.

  



  Update 1 :
So I've tried to set the H264 codec, so the codec's meta-data is available. I seem to hit 2 newer issues now.
1) It cannot find the device and therefore cannot configure the encoder.
2) I get the "dimensions not set".

  



  mAVOutputFormat = av_guess_format("gen_vid.mp4", NULL, NULL);
printf("Guessed format\n");

// MUST allocate the media file format context. 
int ret = avformat_alloc_output_context2(&mAVFormatContext, NULL, NULL, "gen_vid.mp4");
printf("Created context = %d\n", ret);
printf("Format = %s\n", mAVFormatContext->oformat->name);

// Even though we already have encoded the H264 frames using x264,
// we still need the codec's meta-data.
const AVCodec *mAVCodec;
mAVCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
if (!mAVCodec) {
    fprintf(stderr, "Codec '%s' not found\n", "H264");
    exit(1);
}
mAVCodecContext = avcodec_alloc_context3(mAVCodec);
if (!mAVCodecContext) {
    fprintf(stderr, "Could not allocate video codec context\n");
    exit(1);
}
printf("Codec context allocated with defaults.\n");
/* put sample parameters */
mAVCodecContext->bit_rate = 400000;
mAVCodecContext->width = width;
mAVCodecContext->height = height;
mAVCodecContext->time_base = (AVRational){1, 30};
mAVCodecContext->framerate = (AVRational){30, 1};
mAVCodecContext->gop_size = 10;
mAVCodecContext->level = 31;
mAVCodecContext->max_b_frames = 1;
mAVCodecContext->pix_fmt = AV_PIX_FMT_NV12;

av_opt_set(mAVCodecContext->priv_data, "preset", "slow", 0);
printf("Set codec parameters.\n");

// Initialize the AVCodecContext to use the given AVCodec.
avcodec_open2(mAVCodecContext, mAVCodec, NULL);            

// Add a new stream to a media file. Must be called before
// calling avformat_write_header().
mAVStream = avformat_new_stream(mAVFormatContext, mAVCodec);
if (!mAVStream) {
    printf("Failed allocating output stream\n");
} else {
    printf("Allocated stream.\n");
}

// TODO How should codecpar be set?
mAVCodecParameters = mAVStream->codecpar;
if (mAVCodecParameters->codec_type != AVMEDIA_TYPE_AUDIO &&
    mAVCodecParameters->codec_type != AVMEDIA_TYPE_VIDEO &&
    mAVCodecParameters->codec_type != AVMEDIA_TYPE_SUBTITLE) {
    printf("Invalid codec?\n");
}

if (!(mAVFormatContext->oformat->flags & AVFMT_NOFILE)) {
    ret = avio_open(&mAVFormatContext->pb, "gen_vid.mp4", AVIO_FLAG_WRITE);
    if (ret < 0) {
      printf("Could not open output file '%s'", "gen_vid.mp4");
    }
  }
printf("Called avio_open()\n");

// MUST write a header.
ret = avformat_write_header(mAVFormatContext, NULL);
if (ret < 0) {
  printf("Error occurred when opening output file (writing header).\n");
}


  



  Now I am getting this output -

  



  Guessed format
Created context = 0
Format = mp4
Codec context allocated with defaults.
Set codec parameters.
[h264_v4l2m2m @ 0x556460344b40] Could not find a valid device
[h264_v4l2m2m @ 0x556460344b40] can't configure encoder
Allocated stream.
Invalid codec?
Called avio_open()
[mp4 @ 0x5564603442c0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[mp4 @ 0x5564603442c0] dimensions not set
Error occurred when opening output file (writing header).