seekTo restarts audio stream

[victordigio]

In some audios, when I call to seekTo, playback is restarted, and the audio start from the beginning. I think there is something wrong with the audio, but with MediaPlayer works fine.

Audio link: http://www.ivoox.com/primer-palo-19-02-16-al-infierno-los_mn_10502707_api_1.mp3
ExoPlayer version: 1.5.0
Device and android version: any

[ojw28]

The file contains a Xing header that's missing a table of content. If there were a table of content, the file would be seekable.

I doubt MediaPlayer is doing a particularly good job of allowing seeking. It's most likely indexing the entire file, which will significantly increase startup latency and will not scale properly to large files. In ExoPlayer we've opted to only support seeking in files that actually contain the information necessary to seek in an efficient and scalable way.

@andrewlewis - As an aside, I briefly wondered whether we should support seeking in this kind of file using a constant bitrate assumption. I gave it a try but seeking was inaccurate by over 40s in some cases for the provided sample, so I'm pretty sure this isn't a good idea. Let me know if you disagree though :).

[victordigio]

Well, I guess if audio is not seekable, at least it should keep current position instead of set to 0. It would be great if could work like MediaPlayer on this cases.

[ojw28]

We won't be making it work like MediaPlayer, for the reasons specified above.

We should allow an application to query whether the media is seekable, so that it can avoid calling seekTo if the media is not seekable except in the case where it wishes to restart the playback. I've filed #1300 to track this.

[PaulWoitaschek]

I have a similar case but I'm not sure if this is not acutally a bug @ojw28
I'll send the file by mail.

ExoPlayer 2.1.1

ffprobe -v quiet -print_format json -show_format -show_streams Chapter\ 03.mp3

{
    "streams": [
        {
            "index": 0,
            "codec_name": "mp3",
            "codec_long_name": "MP3 (MPEG audio layer 3)",
            "codec_type": "audio",
            "codec_time_base": "1/24000",
            "codec_tag_string": "[0][0][0][0]",
            "codec_tag": "0x0000",
            "sample_fmt": "s16p",
            "sample_rate": "24000",
            "channels": 2,
            "channel_layout": "stereo",
            "bits_per_sample": 0,
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/14112000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 44727475968,
            "duration": "3169.464000",
            "bit_rate": "64000",
            "disposition": {
                "default": 0,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0
            }
        },
        {
            "index": 1,
            "codec_name": "mjpeg",
            "codec_long_name": "Motion JPEG",
            "codec_type": "video",
            "codec_time_base": "0/1",
            "codec_tag_string": "[0][0][0][0]",
            "codec_tag": "0x0000",
            "width": 250,
            "height": 250,
            "coded_width": 250,
            "coded_height": 250,
            "has_b_frames": 0,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "1:1",
            "pix_fmt": "yuvj420p",
            "level": -99,
            "color_range": "pc",
            "color_space": "bt470bg",
            "chroma_location": "center",
            "refs": 1,
            "r_frame_rate": "90000/1",
            "avg_frame_rate": "0/0",
            "time_base": "1/90000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 285251760,
            "duration": "3169.464000",
            "bits_per_raw_sample": "8",
            "disposition": {
                "default": 0,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 1,
                "timed_thumbnails": 0
            },
            "tags": {
                "comment": "Other"
            }
        }
    ],
    "format": {
        "filename": "Chapter 03.mp3",
        "nb_streams": 2,
        "nb_programs": 0,
        "format_name": "mp3",
        "format_long_name": "MP2/3 (MPEG audio layer 2/3)",
        "start_time": "0.000000",
        "duration": "3169.464000",
        "size": "25372800",
        "bit_rate": "64043",
        "probe_score": 51,
        "tags": {
            "track": "/41",
            "artist": "Peter F. Hamilton",
            "album": "Judas Unchained",
            "genre": "Audiobook",
            "composer": "John Lee"
        }
    }
}

[ojw28]

Exactly the same case (Xing header that's missing a table of content).

[PaulWoitaschek]

Is it helpful to post the ffmpeg output like this? That could make future reports easier to track for you.

[ojw28]

Just providing the source media is best. That kind of output is normally not sufficient to debug an issue by itself, and if we have the source media we can run mediainfo/ffprobe etc on it ourselves if we need to. Thanks!